CN103296096B - Solar cell - Google Patents
Solar cell Download PDFInfo
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- CN103296096B CN103296096B CN201310145118.9A CN201310145118A CN103296096B CN 103296096 B CN103296096 B CN 103296096B CN 201310145118 A CN201310145118 A CN 201310145118A CN 103296096 B CN103296096 B CN 103296096B
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- electrode
- bus
- auxiliary
- bus electrode
- finger
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- 239000000463 material Substances 0.000 claims abstract description 135
- 239000000758 substrate Substances 0.000 claims abstract description 59
- 210000003811 finger Anatomy 0.000 description 121
- WURBVZBTWMNKQT-UHFFFAOYSA-N 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-one Chemical compound C1=NC=NN1C(C(=O)C(C)(C)C)OC1=CC=C(Cl)C=C1 WURBVZBTWMNKQT-UHFFFAOYSA-N 0.000 description 18
- 210000004932 little finger Anatomy 0.000 description 12
- 238000012545 processing Methods 0.000 description 9
- 238000007650 screen-printing Methods 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000003912 environmental pollution Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Photovoltaic Devices (AREA)
Abstract
The invention discloses a solar cell, which comprises a substrate, a front electrode on a first main surface of the substrate, and a back electrode on a second main surface of the substrate. Wherein the front electrode includes a plurality of finger electrodes extending along a first direction, a bus electrode extending along a second direction intersecting the first direction, and an auxiliary electrode located at one side of the bus electrode and extending along the second direction. Wherein the resistivity of the material of the auxiliary electrode is smaller than that of the material of the bus electrode, and the auxiliary electrode is not in contact with the bus electrode. Alternatively, the auxiliary electrode includes a plurality of sub-electrode portions separated from each other, and each sub-electrode portion is connected to a finger electrode or a bus electrode. Alternatively, the finger electrodes are connected to the bus electrodes through a plurality of branch electrodes.
Description
Technical field
The invention relates to a kind of solar cell, relate to the solar cell that one has auxiliary electrode or divergent electrode especially.
Background technology
In recent years, because the problem of environmental pollution is more and more serious, a lot of country starts to develop new green energy resource to reduce the problem of environmental pollution.Solar cell can transfer the luminous energy of the sun to electric energy, and this conversion can not produce the material of any contaminative, and therefore solar cell comes into one's own gradually.
Referring to Fig. 1 and Fig. 2, is cutaway view and the vertical view of known solar cell respectively.As shown in Figures 1 and 2, solar cell there is substrate 100, the anti-reflecting layer (antireflection layer) 120 be stacked on the first first type surface 100a of substrate 100, the back electrode 400 that is positioned at the front electrode 200 on the first first type surface 100a of substrate 100 and is positioned on the second first type surface 100b of substrate.Wherein, front electrode 200 has along a plurality of finger electrodes 220 of a direction extension and the bus electrode 210 along other direction extension, use the common pattern forming front electrode 200, substrate 100 also comprises the adjacent first first type surface 100a of an emission layer (emitter layer) 110.
Wherein, because finger electrode 220 is mainly in order to collected current, and bus electrode 210 is mainly be sent to external device (ED) in order to the electric current collected by finger electrode 220 and weld in order to follow-up module, therefore general bus electrode 220 is wider, and in order to save material cost (such as silver), existing design at present makes the conductance of material contained by bus electrode 210 be not so good as the conductance of material contained by finger electrode 220.
But, if when the conductance of the material of bus electrode 210 is not so good as the conductance of the material of finger electrode 220, as shown in the region A of Fig. 2, the region B of contiguous bus electrode 210 will be limited by the impact of the material of bus electrode 210, and make the electric current collection deleterious of region B, and then reduce the overall efficiency of solar cell.
Summary of the invention
Because the problem of above-mentioned prior art, the wherein object of the present invention is exactly be greater than the auxiliary electrode of bus electrode or the solar cell of divergent electrode, use the collected current efficiency improving solar cell providing one to have current collection efficiency.
Edge is, for reaching above-mentioned purpose, the invention provides a kind of solar cell, at least comprising: substrate; Front electrode, is positioned on the first first type surface of substrate; And back electrode, be positioned at substrate relative on the second first type surface of the first first type surface.Wherein, front electrode comprises: a plurality of finger electrode, extends respectively along first direction; Bus electrode, along second direction extend and second direction mutually intersect with first direction system; And auxiliary electrode, be positioned at the side of bus electrode and also extend along second direction, wherein auxiliary electrode does not contact with bus electrode, and the resistivity of the material of auxiliary electrode is less than the resistivity of the material of bus electrode.
Wherein, front electrode can more comprise another auxiliary electrode, and this another auxiliary electrical polar system is positioned at the opposite side of bus electrode and also extends along second direction.Further, this another auxiliary electrode does not also contact with bus electrode, and the resistivity of the material of this another auxiliary electrode is also less than the resistivity of the material of bus electrode.
Wherein, the tenor of the material of auxiliary electrode can be greater than the tenor of the material of bus electrode.In addition, the material of auxiliary electrode can be same as the material of finger electrode, and now auxiliary electrode and finger electrode can be formed via with screen printing processing.And when the material of auxiliary electrode is different from the material of finger electrode and both overlap, in the two, be positioned at below with the emission layer of direct contact substrate containing the better system of material person that resistivity is lower.
Wherein, auxiliary electrode have away from bus electrode away from limit, and be less than or equal to the spacing of two finger electrodes adjacent in this little finger electrode away from distance one of between limit and bus electrode.
Wherein, each finger electrode can each self-contained two strip shaped electric poles portions be separated from each other, and this two strip shaped electric poles portion is distinctly positioned at two sides of bus electrode, and this two strip shaped electric poles portion has the one end with bus electrode overlapping separately.
Therefore, one of solar cell of the present invention feature is, the side area by bus electrode arranges conductance preferably auxiliary electrode, uses the electric current in the region of collecting contiguous bus electrode.Another feature of the solar cell of the present invention is, auxiliary electrode and bus electrode keep at a certain distance away, and uses the effective coverage increasing auxiliary electrode collected current, and then increases the electric current of collection.
In addition, the present invention more proposes another kind of solar cell, comprises: substrate; Front electrode, is positioned on the first first type surface of substrate; And back electrode, be positioned at substrate relative on the second first type surface of the first first type surface.Wherein, front electrode comprises: a plurality of finger electrode, extends respectively along first direction; Bus electrode, extend, and second direction is intersected mutually with first direction system along second direction; And auxiliary electrode, be positioned at the side of bus electrode and extend along second direction, and the resistivity of the material of auxiliary electrode is less than the resistivity of the material of bus electrode.Wherein, this auxiliary electrode comprises a plurality of sub-electrode portions be separated from each other, and each sub-electrode portion is distinctly connected to the one in this little finger electrode.
Wherein, front electrode can more comprise another auxiliary electrode, and this another auxiliary electrode is positioned at the opposite side of bus electrode and also extends along second direction, and the resistivity of the material of this another auxiliary electrode is also less than the resistivity of the material of bus electrode.Further, this two auxiliary electrode distinctly can have a plurality of sub-electrode portions be separated from each other, and each sub-electrode portion distinctly can be connected to the one in this little finger electrode.
Wherein, auxiliary electrode can not contact with bus electrode.
Wherein, auxiliary electrode has away from one of bus electrode away from limit, and is less than or equal to the spacing of two finger electrodes adjacent in this little finger electrode away from the distance between limit and bus electrode.
Wherein, the tenor of the material of auxiliary electrode can be greater than the tenor of the material of bus electrode.In addition, the material of auxiliary electrode can be same as the material of finger electrode, and now auxiliary electrode and finger electrode can be formed via with screen printing processing.And when the material of auxiliary electrode is different from the material of finger electrode, in the two, be positioned at below with the emission layer of direct contact substrate containing the better system of material person that resistivity is lower.
Wherein, each finger electrode can each self-contained two strip shaped electric poles portions be separated from each other, and this two strip shaped electric poles portion is distinctly positioned at two sides of bus electrode, and this two strip shaped electric poles portion has the one end with bus electrode overlapping separately.
In addition, the present invention reintroduces a kind of solar cell, comprises: substrate; Front electrode, is positioned on the first first type surface of substrate; And back electrode, be positioned at substrate relative on the second first type surface of the first first type surface.Wherein, front electrode comprises: a plurality of finger electrode, extends respectively along first direction; Bus electrode, extend, and second direction is intersected mutually with first direction system along second direction; And auxiliary electrode, be positioned at the side of bus electrode and extend along second direction, and the resistivity of the material of auxiliary electrode is less than the resistivity of the material of bus electrode.Wherein, auxiliary electrode comprises a plurality of sub-electrode portions be separated from each other, and comprises the first conductive part connected with bus electrode between distinctly adjacent in this little finger electrode two finger electrodes in each sub-electrode portion.
Wherein, front electrode more comprises another auxiliary electrode, and this another auxiliary electrode is positioned at the opposite side of bus electrode and also extends along second direction, and the resistivity of the material of this another auxiliary electrode is also less than the resistivity of the material of bus electrode.Further, this two auxiliary electrode distinctly can have a plurality of sub-electrode portions be separated from each other, and each sub-electrode portion between two distinctly adjacent in this little finger electrode finger electrodes, and can comprise the first conductive part connected with bus electrode.Wherein, the part in sub-electrode portion and bus electrode overlap, and this part optimum system in sub-electrode portion is between bus electrode and substrate, and directly contact with the emission layer of substrate with the collecting effect of optimization electric current.
Wherein, auxiliary electrode has away from one of bus electrode away from limit, and is less than or equal to the spacing of two finger electrodes adjacent in this little finger electrode away from distance one of between limit and bus electrode.
Wherein, the tenor of the material of auxiliary electrode can be greater than the tenor of the material of bus electrode.In addition, the material of auxiliary electrode can be same as the material of finger electrode, and now auxiliary electrode and finger electrode can be formed via with screen printing processing.And when the material of auxiliary electrode is different from the material of finger electrode, in the two, be positioned at below with the emission layer of direct contact substrate containing the better system of material person that resistivity is lower.
Wherein, the bearing of trend in each sub-electrode portion intersects mutually with aforementioned second direction.
Wherein, each finger electrode can each self-contained two strip shaped electric poles portions be separated from each other, and this two strip shaped electric poles portion is distinctly positioned at two sides of bus electrode, and this two strip shaped electric poles portion has the one end with bus electrode overlapping separately.
Wherein, each sub-electrode portion more can comprise the second conductive part be interconnected with the first conductive part, and the second conductive part bearing of trend out of the ordinary from the first conductive part is different.
Moreover the present invention proposes again a kind of solar cell, comprises: substrate; Front electrode, is positioned on the first first type surface of substrate; And back electrode, be positioned at substrate relative on the second first type surface of the first first type surface.Wherein, front electrode comprises: a plurality of finger electrode, extends respectively along first direction; Bus electrode, extends along the second direction differing from first direction; And a plurality of divergent electrode, the resistivity of the material of this little divergent electrode is less than the resistivity of the material of bus electrode, wherein each finger electrode and the bus electrode at least bifurcated electrode in a little divergent electrode is thus connected, and each divergent electrode is all connected with bus electrode, and be connected to same finger electrode this at least bifurcated electrode extend different directions separately.Further, a part for divergent electrode and bus electrode overlap, and this part system of divergent electrode is between bus electrode and substrate, and the emission layer of the direct contact substrate of better system.
Wherein, each divergent electrode has away from one of bus electrode away from limit, and is less than or equal to the spacing of two finger electrodes adjacent in this little finger electrode away from distance one of between limit and bus electrode.
Wherein, the resistivity of the material of this little divergent electrode is less than the resistivity of the material of bus electrode.Wherein, the tenor of the material of divergent electrode can be greater than the tenor of the material of bus electrode.In addition, the material of divergent electrode can be same as the material of finger electrode, and now divergent electrode and finger electrode can be formed via with screen printing processing.And when the material of divergent electrode is different from the material of finger electrode, in the two, be positioned at below with the emission layer of direct contact substrate containing the material person optimum system that resistivity is lower.
In sum, the feature of the solar cell of the present invention is, arranges auxiliary electrode or divergent electrode to increase the efficiency of collected current in the region by contiguous bus electrode.
In sum, according to the solar cell of the present invention, one or more following advantage can be had:
(1) auxiliary electrode or divergent electrode that current collection efficiency is better than bus electrode are set in the region of contiguous bus electrode, to increase the efficiency of collected current.
(2) auxiliary electrode and bus electrode configure at interval at a certain distance, use the effective coverage and efficiency that increase auxiliary electrode collected current.
Accompanying drawing explanation
Fig. 1 is the cutaway view of known solar cell.
Fig. 2 is the vertical view of known solar cell.
Fig. 3 is the vertical view of the first embodiment of the solar cell of the present invention.
Fig. 4 is the partial top view of the second embodiment of the solar cell of the present invention.
Fig. 5 is the partial top view of the 3rd embodiment of the solar cell of the present invention.
Fig. 6 is the partial top view of the 4th embodiment of the solar cell of the present invention.
Fig. 7 is the partial top view of the 5th embodiment of the solar cell of the present invention.
Fig. 8 is the partial top view of the 6th embodiment of the solar cell of the present invention.
Embodiment
Refer to Fig. 3, Fig. 3 is the vertical view of the first embodiment of the solar cell of the present invention.Further, the stack architecture of the solar cell of the present invention is similar to known structure.That is the solar cell of the present invention at least comprises substrate, front electrode and back electrode.Wherein, substrate has the first relative first type surface and the second first type surface, and substrate can have the emission layer being adjacent to the first first type surface, and first surface can have anti-reflecting layer, uses and reduces light reflection to increase the absorption of solar energy.Further, on anti-reflecting layer, such as form front electrode with wire mark sintering process, make part or all of front electrode be connected with emission layer and be electrical connected.In other words, front electrode system is positioned on the first first type surface of substrate, and back electrode is then positioned on the second first type surface.
As shown in Figure 3, the front electrode of the solar cell of the present invention comprises bus electrode 210, auxiliary electrode and a plurality of finger electrode 220 be parallel to each other.Wherein, the front electrode of the solar cell of the present invention can have 2 or 3 bus electrodes 210, and the adjacent domain of each bus electrode 210 all can have auxiliary electrode to increase the electric current of collection.Wherein this little finger electrode 220 is extend along a direction respectively, and this little finger electrode 220 is the electric current collected in emission layer, and therefore finger electrode 220 is preferably directly connected with emission layer.And the direction of bus electrode 210 extension and the direction of finger electrode 220 extension intersect mutually, because bus electrode 210 is that electric current in order to be collected by finger electrode 220 is sent in external device (ED) and in order to the welding of follow-up module, the conductivity of the material of bus electrode 210 can lower than the conductivity of the material of finger electrode 220.That is the resistivity of the material of bus electrode 210 can be greater than the resistivity of the material of finger electrode 220.Wherein, with regard to the overlapping area of finger electrode 220 and bus electrode 210, finger electrode 220 preferably between bus electrode 210 and substrate to increase current collection efficiency.
More particularly, the solar cell of the present invention arranges auxiliary electrode 311 in the side of bus electrode 210, and extends along the direction of bus electrode 210 extension.Further, auxiliary electrode 311 does not contact with bus electrode 210, and the resistivity of the material of auxiliary electrode 311 is less than the resistivity of the material of bus electrode 210, uses the electric current that region produced effectively can collecting contiguous bus electrode 210.In addition, the opposite side of bus electrode 210 also can be provided with auxiliary electrode 321, and auxiliary electrode 321 also extends along the direction of bus electrode 210 extension.Wherein, auxiliary electrode 321 does not also contact with bus electrode 210, and the resistivity of the material of auxiliary electrode 321 is less than the resistivity of the material of bus electrode 210.
That is, the front electrode of the solar cell of the present invention can comprise along first direction extend a plurality of be parallel to each other finger electrode 220, be separated from each other and the auxiliary electrode 311 and 321 that all intersects with first direction of bearing of trend, and do not contact the bus electrode 210 of auxiliary electrode 311 and 321 between auxiliary electrode 311 and 321.Wherein, the resistivity of the material of auxiliary electrode 311 and 321 and finger electrode 220 is all less than the resistivity of the material of bus electrode 210.For example, the material of auxiliary electrode 311 and 321 can be same as the material of finger electrode 220, and now auxiliary electrode 311 and 321 can be formed via with screen printing processing with finger electrode 220.
And when the resistivity of the material of auxiliary electrode 311 and 321 is less than the resistivity of the material of finger electrode 220, in the region of auxiliary electrode 311 or 321 and finger electrode 220 overlapping, auxiliary electrode 311 or 321 is preferably positioned at the below of finger electrode 220.Otherwise, when the resistivity of the material of auxiliary electrode 311 and 321 is greater than the resistivity of the material of finger electrode 220, finger electrode 220 is preferably positioned at the below of auxiliary electrode 311 or 321, that is the lower better system of one of resistivity is arranged in below with the emission layer of direct contact substrate.In addition, the tenor of the material of auxiliary electrode 311 and 321 can be greater than the tenor of the material of bus electrode 210, and wherein the metal that material comprised of auxiliary electrode 311 and 321 can be such as silver, copper or the good metal of other conductivity.For example, if the present invention uses the mode of wire mark sintering metal slurry to form front electrode, then the tenor in auxiliary electrode 311 and 321 metal paste used is greater than the tenor in the metal paste of bus electrode 210 use.
In addition, as shown in the region A2 of Fig. 3, if the spacing of two finger electrodes adjacent in finger electrode 220 is D, then in auxiliary electrode 311 comparatively away from bus electrode 210 on one side (namely away from limit 501) and the distance R system of bus electrode 210 be less than or equal to the space D of two adjacent finger electrodes, use the electric current in the region positively can collecting contiguous bus electrode 210.
Therefore, one of solar cell of the present invention feature is, arranges conductance preferably auxiliary electrode by the side of bus electrode 210 or two sides, uses the electric current in the region of collecting contiguous bus electrode 210.Another feature of the solar cell of the present invention is, auxiliary electrode and bus electrode 210 at a certain distance interval configure, and uses the effective coverage increasing auxiliary electrode collected current.
Fig. 4 is the partial top view of the second embodiment of the solar cell of the present invention, with the first embodiment unlike, the each self-contained two strip shaped electric poles portions 221 and 222 be separated from each other of each finger electrode 220 of the second embodiment, and the strip shaped electric poles portion 221 and 222 of same group is positioned at two sides of bus electrode 210 separately, further, each strip shaped electric poles portion 221 and 222 has the one end with bus electrode 210 overlapping separately.
Strip shaped electric poles portion 221,222 all extends along the direction being different from bus electrode 210 extension, and the one end in strip shaped electric poles portion 221 is overlapped in the side of bus electrode 210, and the one end in strip shaped electric poles portion 222 is overlapped in the opposite side of bus electrode 210, use and strip shaped electric poles portion 221 and strip shaped electric poles portion 222 are all electrically connected with bus electrode 210, wherein, the part of each strip shaped electric poles portion 221 and 222 and bus electrode 210 overlapping is all between bus electrode 210 and substrate 100.
Therefore, one of second embodiment of the solar cell of the present invention feature is, by least two strip shaped electric poles portions 221 and 222 be separated from each other, uses and reduces the required material of finger electrode 220, and then reduce costs.
In addition, please continue and consult Fig. 5, Fig. 5 is the partial top view of the 3rd embodiment of the solar cell of the present invention.3rd embodiment also at least comprises substrate, front electrode and back electrode.Similar with the first embodiment, in substrate, the side of contiguous first first type surface has emission layer, and first surface can have anti-reflecting layer, and part or all of front electrode is connected with emission layer and is electrical connected.In addition, back electrode is positioned at substrate relative on the second first type surface of the first first type surface.
As shown in Figure 5, the front electrode of the 3rd embodiment of the solar cell of the present invention comprises bus electrode 210, auxiliary electrode and a plurality of finger electrode be parallel to each other.Wherein, the front electrode of the solar cell of the present invention can have 2 or 3 bus electrodes 210, and the adjacent domain of each bus electrode 210 all can have auxiliary electrode to increase the electric current of collection.Wherein this little finger electrode need be electrically connected with emission layer 110, and better system directly contacts.And the direction of bus electrode 210 extension and the direction of finger electrode extension intersect mutually, the conductivity of the material of bus electrode 210 is lower than the conductivity of the material of finger electrode.
In addition, the solar cell of the present invention arranges auxiliary electrode 312 in bus electrode 210 is other, uses the electric current that region produced effectively collecting contiguous bus electrode 210.In detail, auxiliary electrode 312 is positioned at the side of bus electrode 210, and the bearing of trend of auxiliary electrode 312 is same as the bearing of trend of bus electrode 210.Wherein, the resistivity of the material of auxiliary electrode 312 is less than the resistivity of the material of bus electrode 210.For example, the material of auxiliary electrode 312 can be same as the material of finger electrode 220, and now auxiliary electrode 312 can be formed via with screen printing processing with finger electrode 220.
And when the resistivity of the material of auxiliary electrode is less than the resistivity of the material of finger electrode 220, in auxiliary electrode 312 with the region of finger electrode 220 overlapping, auxiliary electrode 312 is the below being positioned at finger electrode 220.Otherwise when the resistivity of the material of auxiliary electrode 312 is greater than the resistivity of the material of finger electrode 220, finger electrode 220 is the below being positioned at auxiliary electrode 312.Also or, the tenor of the material of auxiliary electrode 312 can be greater than the tenor of the material of bus electrode 210.In addition, in the 3rd embodiment of the solar cell of the present invention, auxiliary electrode 312 comprises a plurality of sub-electrode portions be separated from each other, and each sub-electrode portion is distinctly connected to the one in finger electrode.For example, in one of the front electrode of the solar cell of the present invention region, such as there is finger electrode 220a and 220b, and auxiliary electrode 312 comprises sub-electrode portion 312a and 312b be separated from each other in this region, then sub-electrode portion 312a connects finger electrode 220a, and sub-electrode portion 312b connects finger electrode 220b, uses and makes 312a and 312b collected electric current in sub-electrode portion distinctly can be sent to bus electrode 210 by finger electrode 220a and 220b.
Be same as the first embodiment of the solar cell of the present invention, the front electrode of the 3rd embodiment of the solar cell of the present invention also can comprise the auxiliary electrode of the opposite side being positioned at bus electrode 210, and the bearing of trend of this auxiliary electrode also can be same as the bearing of trend of bus electrode 210.Wherein, the resistivity of the material of this auxiliary electrode is also less than the resistivity of the material of bus electrode 210.In addition, in the 3rd embodiment, the auxiliary electrode being distinctly positioned at bus electrode 210 2 side distinctly can have a plurality of sub-electrode portions be separated from each other, and each sub-electrode portion is all connected to the one in finger electrode.Wherein, when the material of auxiliary electrode 312 is same as the material of finger electrode, auxiliary electrode 312 can be formed via with screen printing processing with finger electrode.And when auxiliary electrode 312 is different from the material of finger electrode, the better system of the one that resistivity is lower is arranged in below with the emission layer of direct contact substrate.In addition, be same as the second embodiment, each finger electrode of 3rd embodiment of the solar cell of the present invention can each self-contained two strip shaped electric poles portions be separated from each other, wherein this two strip shaped electric poles portion is distinctly positioned at two sides of bus electrode 210, and this two strip shaped electric poles portion has the one end with bus electrode 210 overlapping separately.Moreover the auxiliary electrode 312 of the 3rd embodiment of the solar cell of the present invention also directly can not contact with bus electrode 210.
In addition, if the spacing of two finger electrodes adjacent in finger electrode is D, then in auxiliary electrode 312 comparatively away from bus electrode 210 on one side (namely away from limit 502) and the distance R system of bus electrode 210 be less than or equal to the space D of two finger electrodes adjacent in finger electrode, use the electric current in the region positively can collecting contiguous bus electrode 210.
Therefore, one of the 3rd embodiment of the solar cell of the present invention feature is, comprises a plurality of sub-electrode portions (as 312a and 312b) be separated from each other by auxiliary electrode 312, uses and reduces the required material of auxiliary electrode 312, and then reduce costs.
In addition, please continue and consult Fig. 6, Fig. 6 is the partial top view of the 4th embodiment of the solar cell of the present invention.4th embodiment at least comprises substrate, front electrode and back electrode.Be similar to the first embodiment, in substrate, the side of contiguous first first type surface has emission layer, and the first first type surface can have anti-reflecting layer, and part or all of front electrode and emission layer are electrical connected, and better system directly connects.In addition, back electrode is positioned on the second first type surface relative to the first first type surface.
As shown in Figure 6, the front electrode of the 4th embodiment of the solar cell of the present invention comprises bus electrode 210, auxiliary electrode and a plurality of finger electrode be parallel to each other.Wherein, front electrode has 2 or 3 bus electrodes 210, and the adjacent domain of each bus electrode 210 all can have auxiliary electrode to increase the electric current of collection.Wherein this little finger electrode system is used for being electrically connected with emission layer with collected current.And the direction of bus electrode 210 extension and the direction of finger electrode extension mutually intersect and be electrical connected, the conductivity of the material of bus electrode 210 is lower than the conductivity of the material of finger electrode.That is the resistivity of the material of bus electrode 210 is greater than the resistivity of the material of finger electrode.
In addition, the solar cell of the present invention arranges auxiliary electrode 313 in bus electrode 210 is other, uses the electric current that region produced effectively collecting contiguous bus electrode 210.In detail, auxiliary electrode 313 is positioned at the side of bus electrode 210, and the bearing of trend of auxiliary electrode 313 entirety is same as the bearing of trend of bus electrode 210.Wherein, the resistivity of the material of auxiliary electrode 313 is less than the resistivity of the material of bus electrode 210.For example, the tenor of the material of auxiliary electrode 313 can be greater than the tenor of the material of bus electrode 210.Also or, the material of auxiliary electrode 313 can be same as the material of finger electrode, and now auxiliary electrode 313 can be formed via with screen printing processing with finger electrode.In addition, the material of auxiliary electrode 31 also can be different from the material of finger electrode.
And in the 4th embodiment of the solar cell of the present invention, auxiliary electrode 313 comprises a plurality of sub-electrode portions (as 313a and 313b) be separated from each other, and each sub-electrode portion is distinctly between two adjacent finger electrodes, and each sub-electrode portion all comprises the first conductive part connected with bus electrode 210.Wherein, the first conductive part is to contact emission layer between bus electrode with substrate with the part of bus electrode 210 overlapping.Further, the bearing of trend system that each sub-electrode portion is indivedual intersects mutually with the bearing of trend of bus electrode 210.For example, can such as have finger electrode 220a, 220b and 220c in one of solar cell of the present invention region, then auxiliary electrode 313 such as can have sub-electrode portion 313a and 313b in this region.Wherein, sub-electrode portion 313a is between finger electrode 220a and finger electrode 220b, and sub-electrode portion 313b is between finger electrode 220b and finger electrode 220c, in this embodiment, sub-electrode portion 313a intersects (such as vertical) in the bearing of trend of bus electrode 210 with the bearing of trend of sub-electrode portion 313b.Further, sub-electrode portion 313a and 313b is not directly connected on finger electrode 220a, 220b and 220c, and is be connected on bus electrode 210 to be sent to external device (ED) with the electric current that will collect by bus electrode 210.
Be same as the first embodiment of the solar cell of the present invention, the front electrode of the 4th embodiment of the solar cell of the present invention also can comprise the auxiliary electrode of the opposite side being positioned at bus electrode 210, and the bearing of trend of this auxiliary electrode also can be same as the bearing of trend of bus electrode 210.Wherein, the resistivity of the material of this auxiliary electrode is less than the resistivity of the material of bus electrode 210.In addition, in the 4th embodiment, the auxiliary electrode being distinctly positioned at bus electrode 210 2 side distinctly can have a plurality of sub-electrode portions be separated from each other.Wherein, each sub-electrode portion is distinctly between two adjacent finger electrodes, and each sub-electrode portion all comprises the first conductive part connected with bus electrode 210.Wherein, a part for the first conductive part overlap with bus electrode 210 and this part system between bus electrode with substrate to contact emission layer.Further, the bearing of trend that each sub-electrode portion is indivedual intersects mutually with the bearing of trend of bus electrode 210.In addition, be same as the second embodiment, each finger electrode of 4th embodiment of the solar cell of the present invention also can each self-contained two strip shaped electric poles portions be separated from each other, wherein this two strip shaped electric poles portion is distinctly positioned at two sides of bus electrode 210, and this two strip shaped electric poles portion has the one end with bus electrode 210 overlapping separately.
In addition, if the spacing of two finger electrodes adjacent in finger electrode is D, then in auxiliary electrode 313 comparatively away from bus electrode 210 on one side (namely away from limit 503) and the distance R system of bus electrode 210 be less than or equal to the space D of two finger electrodes adjacent in finger electrode, use the electric current in the region positively can collecting contiguous bus electrode 210.
In addition, each sub-electrode portion more can comprise the second conductive part be interconnected with the first conductive part, and the second conductive part bearing of trend out of the ordinary from the first conductive part is different.Please continue and consult Fig. 7, the 7th figure is the partial top view of the 5th embodiment of the solar cell of the present invention.As shown in Figure 7, the auxiliary electrode 314 of the front electrode of the solar cell of the present invention can have a plurality of sub-electrode portion, and this little electrode section distinctly between two adjacent finger electrodes (as between 220a and 220b or between 220b and 220c etc.), and distinctly comprise the first conductive part (as 314a and 314b) connected with bus electrode 210.Wherein, the first conductive part is to contact emission layer between bus electrode with substrate with the part of bus electrode 210 overlapping.Further, the bearing of trend that each sub-electrode portion is indivedual intersects mutually with the bearing of trend of bus electrode 210.
Continuous speech, the second conductive part (as 315a and 315b) that bearing of trend is different from the first conductive part is then connected on the first conductive part, uses the area increasing auxiliary electrode 314 collected current.For example, the second conductive part 315a can be connected to one of the first conductive part 314a end points, jointly to form the sub-electrode portion of T font.Also or, the second conductive part 315b can be connected to the first conductive part 314b in the middle of, jointly to form cross sub-electrode portion.In addition, the sub-electrode portion of the auxiliary electrode of the 5th embodiment of the solar cell of the present invention also can present other various shapes (as round or forked type etc.).
In the same manner, if the spacing of two finger electrodes adjacent in finger electrode is D, then in auxiliary electrode 314 comparatively away from bus electrode 210 on one side (namely away from limit 504) and the distance R system of bus electrode 210 be less than or equal to the space D of two finger electrodes adjacent in finger electrode, use the electric current in the region positively can collecting contiguous bus electrode 210.For example, if the second conductive part 315a is connected to one of the first conductive part 314a end points, to be then in the second conductive part 315a comparatively away from bus electrode 210 away from limit 504.And if the second conductive part 315b be connected to the first conductive part 314b in the middle of, to be then in the first conductive part 314b comparatively away from bus electrode 210 away from limit 504.In sum, away from limit 504 be in sub-electrode portion comparatively away from bus electrode 210.
Please continue and consult Fig. 8, Fig. 8 is the partial top view of the 6th embodiment of the solar cell of the present invention.6th embodiment at least comprises substrate, front electrode and back electrode.Be similar to the first embodiment, substrate can have the emission layer being adjacent to the first first type surface, and first surface can have anti-reflecting layer, and part or all of front electrode and emission layer are electrical connected, and better system directly connects.In addition, back electrode is positioned on the second first type surface relative to the first first type surface.
As shown in Figure 8, the front electrode of the 6th embodiment of the solar cell of the present invention comprises bus electrode 210, a plurality of divergent electrode and a plurality of finger electrode be parallel to each other.Wherein, the front electrode of the solar cell of the present invention can have 2 or 3 bus electrodes 210, and the adjacent domain of each bus electrode 210 all can have divergent electrode to increase the electric current of collection.Wherein, finger electrode is respectively along an identical direction extension, and bus electrode 210 then extends along other direction.In addition, each finger electrode is connected via at least bifurcated electrode in divergent electrode with bus electrode 210, that is each finger electrode connects one end of at least bifurcated electrode, and the other end of each divergent electrode is connected to bus electrode 210.Wherein, the part of divergent electrode and bus electrode 210 overlapping be bus electrode 210 with between substrate directly to contact emission layer.In addition, the divergent electrode system being connected to identical finger electrode extends different directions separately.
For example, finger electrode 220a and 220b and divergent electrode 331a, 331b, 332a and 332b can be had in one of the solar cell region of the present invention.Wherein, divergent electrode 331a and 331b all connects finger electrode 220a and bus electrode 210, uses and finger electrode 220a and bus electrode 210 are interconnected via divergent electrode 331a and 331b.Further, divergent electrode 331a and 331b system extend different directions separately.Similarly, divergent electrode 332a and 332b all connects finger electrode 220b and bus electrode 210, uses and finger electrode 220b and bus electrode 210 are interconnected via divergent electrode 332a and 332b.Further, divergent electrode 332a and 332b system extend different directions separately.Wherein, divergent electrode 331b can mutually directly be connected with divergent electrode 332a or directly not connect.In addition, the quantity being connected to the divergent electrode of identical finger electrode also can more than two.
In addition, the resistivity system of the material of divergent electrode is less than the resistivity of the material of bus electrode 210.For example, the material of divergent electrode can be same as the material of finger electrode, and now divergent electrode can be formed via with screen printing processing with finger electrode 220.In addition, the material of divergent electrode also can be different from the material of finger electrode.Also or, the tenor of the material of divergent electrode is greater than the tenor of the material of bus electrode 210.In addition, if the spacing of two finger electrodes adjacent in finger electrode is D, then in divergent electrode comparatively away from bus electrode 210 on one side (namely away from limit 505) and the distance R system of bus electrode 210 be less than or equal to the space D of two finger electrodes adjacent in finger electrode, use positively collection and be close to the electric current in the region of bus electrode 210.
In sum, one of solar cell of the present invention feature is, arranges auxiliary electrode or divergent electrode that current collection efficiency is greater than bus electrode 210, use the electric current increasing collection in the region by contiguous bus electrode 210.
The foregoing is only illustrative, but not be restricted person.Any spirit and category not departing from the present invention, and to its equivalent modifications of carrying out or change, all should be contained in claim.
Claims (21)
1. a solar cell, is characterized in that, comprises:
One substrate;
One front electrode, is positioned on one of this substrate first first type surface; And
One back electrode, is positioned at this substrate relative on one of this first first type surface second first type surface; Wherein
This front electrode comprises:
A plurality of finger electrode, extends along a first direction respectively;
One bus electrode, extend, and this second direction is intersected mutually with this first direction along a second direction; And
One auxiliary electrode, be positioned at the side of this bus electrode and extend along this second direction, wherein this auxiliary electrode does not contact with this bus electrode, and the resistivity of the material of this auxiliary electrode is less than the resistivity of the material of this bus electrode.
2. solar cell as claimed in claim 1, wherein this front electrode more comprises another auxiliary electrode and is positioned at the opposite side of this bus electrode and extends along this second direction, wherein this another auxiliary electrode does not also contact with this bus electrode, and the resistivity of the material of this another auxiliary electrode is less than the resistivity of the material of this bus electrode.
3. solar cell as claimed in claim 1, wherein this auxiliary electrode has away from one of this bus electrode away from limit, and should be less than or equal to the spacing of two finger electrodes adjacent in those finger electrodes away from distance one of between limit and this bus electrode.
4. solar cell as claimed in claim 1, wherein the material of this auxiliary electrode is different from the material of those finger electrodes.
5. a solar cell, is characterized in that, comprises:
One substrate;
One front electrode, is positioned on one of this substrate first first type surface; And
One back electrode, is positioned at this substrate relative on one of this first first type surface second first type surface; Wherein
This front electrode comprises:
A plurality of finger electrode, extends along a first direction respectively;
One bus electrode, extend, and this second direction is intersected mutually with this first direction along a second direction; And
One auxiliary electrode, be positioned at the side of this bus electrode and extend along this second direction, and the resistivity of the material of this auxiliary electrode is less than the resistivity of the material of this bus electrode, wherein this auxiliary electrode comprises a plurality of sub-electrode portions be separated from each other, and each those sub-electrode portion is distinctly connected to the one in those finger electrodes.
6. solar cell as claimed in claim 5, wherein this front electrode more comprises another auxiliary electrode and is positioned at the opposite side of this bus electrode and extends along this second direction, and wherein the resistivity of the material of this another auxiliary electrode is also less than the resistivity of the material of this bus electrode.
7. solar cell as claimed in claim 6, wherein two these auxiliary electrodes distinctly have those sub-electrode portions be separated from each other, and each those sub-electrode portion is distinctly connected to the one in those finger electrodes.
8. solar cell as claimed in claim 5, wherein this auxiliary electrode does not contact with this bus electrode.
9. solar cell as claimed in claim 5, wherein this auxiliary electrode has away from one of this bus electrode away from limit, and should be less than or equal to the spacing of two finger electrodes adjacent in those finger electrodes away from distance one of between limit and this bus electrode.
10. solar cell as claimed in claim 5, wherein the material of this auxiliary electrode is different from the material of those finger electrodes.
11. 1 kinds of solar cells, is characterized in that, comprise:
One substrate;
One front electrode, is positioned on one of this substrate first first type surface; And
One back electrode, is positioned at this substrate relative on one of this first first type surface second first type surface; Wherein
This front electrode comprises:
A plurality of finger electrode, extends along a first direction respectively;
One bus electrode, extend, and this second direction is intersected mutually with this first direction along a second direction; And
One auxiliary electrode, be positioned at the side of this bus electrode and extend along this second direction, and the resistivity of the material of this auxiliary electrode is less than the resistivity of the material of this bus electrode, wherein this auxiliary electrode comprises a plurality of sub-electrode portions be separated from each other, and comprises first conductive part that one of to connect with this bus electrode between distinctly adjacent in those finger electrodes two finger electrodes in each those sub-electrode portion.
12. solar cells as claimed in claim 11, wherein the bearing of trend in each those sub-electrode portion intersects mutually with this second direction.
13. solar cells as claimed in claim 11, wherein this front electrode more comprises another auxiliary electrode and is positioned at the opposite side of this bus electrode and extends along this second direction, and wherein the resistivity of the material of this another auxiliary electrode is also less than the resistivity of the material of this bus electrode.
14. solar cells as claimed in claim 13, wherein two these auxiliary electrodes distinctly have those sub-electrode portions be separated from each other, and each those sub-electrode portion distinctly comprises this first conductive part connected with this bus electrode between these two adjacent finger electrodes in those finger electrodes.
15. solar cells as claimed in claim 14, wherein the bearing of trend in each those sub-electrode portion intersects mutually with this second direction.
16. solar cells as claimed in claim 11, wherein this auxiliary electrode has away from one of this bus electrode away from limit, and should be less than or equal to the spacing of two finger electrodes adjacent in those finger electrodes away from distance one of between limit and this bus electrode.
17. solar cells as claimed in claim 11, wherein the material of this auxiliary electrode is different from the material of those finger electrodes.
18. solar cells as claimed in claim 11, wherein each those sub-electrode portion more comprises and one of to be interconnected the second conductive part with this first conductive part, and this second conductive part bearing of trend out of the ordinary from this first conductive part is different.
19. 1 kinds of solar cells, is characterized in that, comprise:
One substrate;
One front electrode, is positioned on one of this substrate first first type surface; And
One back electrode, is positioned at this substrate relative on one of this first first type surface second first type surface; Wherein
This front electrode comprises:
A plurality of finger electrode, extends along a first direction respectively;
One bus electrode, extends along differing from one of this first direction second direction; And
A plurality of divergent electrode, the resistivity of the material of those divergent electrode is less than the resistivity of the material of this bus electrode, wherein each those finger electrode is connected via at least bifurcated electrode in those divergent electrode with this bus electrode, and each those divergent electrode is connected with this bus electrode, and be connected to same finger electrode this at least bifurcated electrode extend different directions separately.
20. solar cells as claimed in claim 19, each those divergent electrode has away from one of this bus electrode away from limit, and should be less than or equal to the spacing of two finger electrodes adjacent in those finger electrodes away from distance one of between limit and this bus electrode.
21. solar cells as claimed in claim 19, wherein the material of those divergent electrode is different from the material of those finger electrodes.
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| Application Number | Priority Date | Filing Date | Title |
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| TW102109049A TWI482289B (en) | 2013-03-14 | 2013-03-14 | Solar cell |
| TW102109049 | 2013-03-14 |
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| CN103296096A CN103296096A (en) | 2013-09-11 |
| CN103296096B true CN103296096B (en) | 2015-09-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108717950A (en) * | 2018-07-13 | 2018-10-30 | 天合光能股份有限公司 | A kind of anti-breaking grid photovoltaic cell and photovoltaic cell component |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107978647A (en) * | 2016-10-21 | 2018-05-01 | 英稳达科技股份有限公司 | Solar cell |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102473755A (en) * | 2009-07-30 | 2012-05-23 | 三洋电机株式会社 | Solar cell module |
| CN102709360A (en) * | 2012-05-08 | 2012-10-03 | 常州天合光能有限公司 | Crystalline silicon solar cell with electrical conductivity improved |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090277491A1 (en) * | 2005-10-14 | 2009-11-12 | Sharp Kabushiki Kaisha | Solar Cell, Interconnector-Equipped Solar Cell, Solar Cell String And Solar Cell Module |
| WO2008080160A1 (en) * | 2006-12-22 | 2008-07-03 | Advent Solar, Inc. | Interconnect technologies for back contact solar cells and modules |
| JP5687506B2 (en) * | 2011-01-28 | 2015-03-18 | 三洋電機株式会社 | Solar cell and solar cell module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102473755A (en) * | 2009-07-30 | 2012-05-23 | 三洋电机株式会社 | Solar cell module |
| CN102709360A (en) * | 2012-05-08 | 2012-10-03 | 常州天合光能有限公司 | Crystalline silicon solar cell with electrical conductivity improved |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108717950A (en) * | 2018-07-13 | 2018-10-30 | 天合光能股份有限公司 | A kind of anti-breaking grid photovoltaic cell and photovoltaic cell component |
| CN108717950B (en) * | 2018-07-13 | 2020-03-27 | 天合光能股份有限公司 | Grid-breakage-preventing photovoltaic cell piece and photovoltaic cell assembly |
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| Publication number | Publication date |
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| CN103296096A (en) | 2013-09-11 |
| TWI482289B (en) | 2015-04-21 |
| TW201436250A (en) | 2014-09-16 |
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