CN103456835A - Device and method for preparing gate electrodes of solar cell - Google Patents
Device and method for preparing gate electrodes of solar cell Download PDFInfo
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- CN103456835A CN103456835A CN2013103296718A CN201310329671A CN103456835A CN 103456835 A CN103456835 A CN 103456835A CN 2013103296718 A CN2013103296718 A CN 2013103296718A CN 201310329671 A CN201310329671 A CN 201310329671A CN 103456835 A CN103456835 A CN 103456835A
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Abstract
The invention provides a device and method for preparing gate electrodes of a solar cell. The device comprises a silver paste supplying device, a nozzle height adjusting module, a nozzle, a programmable-control high-voltage generator, an adsorption platform, a motion platform and a control unit. The method comprises the steps of placing a solar substrate on the adsorption platform, and preparing the first gate electrode and the second gate electrode, wherein the width of the second gate electrode is larger than that of the first gate electrode. The electric spinning direct writing process is utilized for printing the solar electrodes, an electric field is utilized for pulling silver paste in the nozzle to lines with the diameters smaller than the diameter of the nozzle, and the widths and the heights of the printed grid lines can be controlled by controlling the different voltages, the height of the nozzle and the feed speed of a substrate. The voltages affect the stability of a Taylor cone at a certain height, the height affects the heights of the printed grid lines mainly by affecting the degree of cure of the grid lines in the air, the larger the height is, the higher the printed grid lines become, the feed speed of the substrate mainly affects the widths of the printed grid lines, and the higher the speed is, the thinner the grid lines become.
Description
Technical field
The invention belongs to area of solar cell, more specifically, relate to a kind of device and method for preparing the solar cell gate electrode.
Background technology
Solar cell is directly light energy conversion to be become to the device of electric energy by photoelectric effect or Photochemical effects.Along with the continuous progress of photovoltaic industry, market has proposed requirements at the higher level to the photovoltaic product.Efficiently, low cost has become the important goal of solar cell development.One of committed step of solar battery sheet production is that the front and back on silicon chip is made very meticulous circuit, and light induced electron is derived to battery.Simultaneously, in order to obtain high performance solar batteries, the shading-area of grid line will reduce, and possesses again efficient charge-trapping ability, so the preparation of solar battery front side gate electrode seems and is even more important simultaneously.
At present, the preparation of solar cell gate line electrode generally adopts silk-screen printing technique.General screen process press has: printing objective table, printing mask and scraper plate; The printing mounting table has a plurality of adsorption holes on the mounting table top, by vacuum suction, supports the fixing thing that is printed on this mounting table top that is positioned in; Mask to print is for being fixed in the electrode pattern that forms regulation on thing that is printed on this printing mounting table in support; Scraper plate for to be configured in electrocondution slurry on this mask to print apply set pressure, to being printed thing printed.
Grid line width prepared by traditional handicraft, usually more than 80 microns, is highly 5～30 microns, and wide grid line shading-area is large, affects the absorption of light; But grid line attenuates, it is large that the ohmic contact resistance of battery becomes, and limited the capacity gauge of electric current, causes the transformation efficiency of solar cell to reduce.Therefore, obtain high efficiency battery, must reduce the grid line width, improve the depth-width ratio of grid line.Traditional silk-screen printing technique has been difficult to accomplish.In addition, also there is waste silver slurry in silk-screen printing technique, and process equipment is expensive, and there are wearing and tearing in silk screen, disconnected grid and empty printing, can not numerical control etc. shortcoming.Also increased to a certain extent the cost of solar cell.The unsteadiness of silk-screen printing technique itself in addition, degeneration such as the half tone tension force in use caused due to continual pressure, and the pressure of half tone also likely causes cell piece to damage, and the increase of grid line width, all the overall distribution of cell piece efficiency produced to very large impact, whole efficiency has been caused to certain reduction.
Summary of the invention
Above defect or Improvement requirement for prior art, the invention provides a kind of device for preparing the solar cell gate electrode, its purpose is to improve conversion efficiency of solar cell, has solved thus in existing solar cell grid line preparation process by the low low technical problem of conversion efficiency of solar cell caused of absorptivity.
The invention provides a kind of device for preparing the solar cell gate electrode, comprise silver slurry feedway, nozzle height adjustment module, nozzle, program-controlled high pressure generator, absorption platform, motion platform and control unit; Described nozzle comprises prints end, and the silver slurry is supplied with interface and electrical interface; The input control end of described silver slurry feedway is connected with control unit, the output control terminal of silver slurry feedway is supplied with interface with the silver of nozzle slurry and is connected, and described silver slurry feedway for starching and provide required back pressure for Electrospun for described nozzle provides silver-colored under the control of described control unit; One end connection control unit of nozzle height adjustment module, the other end of nozzle height adjustment module connects nozzle, and described nozzle height adjustment module is printed the height between end and solar base plate for the spray printing of regulating described nozzle under the control of described control unit; The output plus terminal of described high pressure generator is connected to the electrical interface of described nozzle, the output negative terminal of described high pressure generator connects described absorption platform, the input control end of described high pressure generator is connected to described control unit, described high pressure generator is under the control of described control unit, at described nozzle be adsorbed between the substrate on absorption platform and apply voltage, form high voltage electric field, make the silver slurry form taylor cone at the printing end of described nozzle, and further pull wire vent under the effect of high voltage electric field; The control end of described motion platform is connected to described control unit, described absorption platform is arranged on described motion platform, described motion platform, under the control of described control unit, drives the substrate be adsorbed on absorption platform and does rectilinear motion, completes gate electrode figure and prints.
Further, the nozzle that described nozzle is single-nozzle or a plurality of array arrangements.
Further, also comprise: be arranged at the insulating barrier between absorption platform and solar base plate.
Further, also comprise: the reel-to-reel device that is arranged at described absorption platform top.
The present invention also provides a kind of method for preparing the solar cell gate electrode, comprises the steps:
(1) solar base plate is arranged on absorption platform;
(2) prepare first grid electrode
(2.1) nozzle that is 100～400 microns by diameter is arranged on the nozzle height adjustment module, and the electrical interface of described nozzle is connected with high pressure generator, the silver of described nozzle slurry is supplied with to interface and be connected with silver slurry feedway, the printing end of described nozzle is perpendicular to described solar base plate;
(2.2) control unit is exported the first control signal and is controlled silver slurry feedway to injecting the silver slurry in the cavity volume of described nozzle;
(2.3) control unit is exported slide block in the second control signal Control Nozzle electronic controlled height adjustment and is slided along screw mandrel, and regulating the nozzle array height is 0.5～2cm;
(2.4) control unit output the 3rd control signal is controlled high pressure generator between nozzle and absorption platform, applying voltage; Voltage is set to 0.8～2kv;
(2.5) control unit output the 4th control signal controlled motion platform moves with the speed of 150～300mm/s along X-direction, and forms first grid electrode;
(3) prepare the second gate electrode according to the step of preparation first grid electrode, the width of described second gate electrode is greater than the width of described first grid electrode.
Further, the step (3) for preparing the second gate electrode specifically comprises:
(3.1) nozzle that is 500～1000 microns by diameter is arranged on the nozzle height adjustment module, and the electrical interface of described nozzle is connected with high pressure generator, the silver of described nozzle slurry is supplied with to interface and be connected with silver slurry feedway, the printing end of described nozzle is perpendicular to described solar base plate;
(3.2) control unit is exported the first control signal and is controlled silver slurry feedway to injecting the silver slurry in the cavity volume of described nozzle;
(3.3) control unit is exported slide block in the second control signal Control Nozzle electronic controlled height adjustment and is slided along screw mandrel, and regulating the nozzle array height is 0.5～1cm;
(3.4) control unit output the 3rd control signal is controlled high pressure generator between nozzle and absorption platform, applying voltage; Voltage is set to 0.8～2kv.
(3.5) control unit output the 4th control signal controlled motion platform moves with the speed of 80～200mm/s along Y-direction, and forms the second gate electrode.
Further, the width of described first grid electrode is 5 μ m～50 μ m, and the height of described first grid electrode is 0.8 μ m～30 μ m.
Further, the spacing between two first grid electrodes is less than two spacings between the second gate electrode.
The present invention also provides a kind of solar energy gate electrode structure that adopts above-mentioned method to prepare.
In general, the above technical scheme of conceiving by the present invention compared with prior art, print the solar energy electrode owing to adopting Electrospun directly to write technique, can be by controlling different voltage, nozzle height, can control with the substrate feed speed grid line width and the height printed, obtain width and reach the even grid of submicron order of micron, and there is higher depth-width ratio.Wherein, the stability of taylor cone under the voltage influence certain altitude.Highly mainly by affecting the skyborne state of cure of grid line, affect the height of printing grid line, in the situation that other conditions are constant, highly higher printed grid line height is higher.The width of grid line is printed in the impact of substrate feed speed major effect, in the situation that other conditions are constant, speed is larger, and grid line is thinner.
The accompanying drawing explanation
Fig. 1 is the graphic structure schematic diagram of solar cell gate electrode;
Fig. 2 is the structural representation of the device for preparing the solar cell gate electrode that provides of first embodiment of the invention;
Fig. 3 is the layout of nozzle array in the device for preparing the solar cell gate electrode that provides of the embodiment of the present invention;
Fig. 4 is the structural representation of the device for preparing the solar cell gate electrode that provides of second embodiment of the invention;
Fig. 5 is that the substrate feed speed is 200mm/s, and nozzle height is 15mm, and when voltage is 1.5kv, the columns of different spray nozzles array brings the variation of printed grating spacing; The grating spacing 4mm that Fig. 5 (a) prints for the single file nozzle, Fig. 5 (b) is the grating spacing 2mm that two row nozzles are printed;
Fig. 6 is that nozzle diameter is 150 μ m, and the substrate feed speed is 200mm/s, when voltage is 1.5kv, and different spray nozzles height, the grid line height difference of printing; Fig. 6 (a) nozzle height is 8mm, and the grid line height of printing is 15 μ m; Fig. 6 (b) nozzle height is 15mm, and its grid line height is 20 μ m;
Fig. 7 is that nozzle diameter is 150 μ m, and when voltage is 1.5kv, nozzle height is 15mm, different substrate feed speed, the grid line width difference of printing; Fig. 7 (a) speed is 150mm/s, and the grid line width of printing is 48 μ m; Fig. 7 (b) speed is 300mm/s, and its grid line width is 30 μ m;
Fig. 8 is that the substrate feed speed is 200mm/s, and when voltage is 1.5kv, nozzle height is 15mm, different spray nozzles diameter, the grid line width difference of printing; Fig. 8 (a) nozzle diameter is 400 μ m, and the grid line width of printing is 100 μ m; Fig. 8 (b) nozzle diameter is 100 μ m, and its grid line width is 30 μ m.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.In addition, below in each execution mode of described the present invention involved technical characterictic as long as form each other conflict, just can mutually not combine.
Fig. 1 is the figure of solar cell gate electrode, and wherein a is first grid electrode, and b is the second gate electrode.For improving battery conversion efficiency, should make the gained gate electrode can either reduce shading-area, can reduce again the series resistance of battery.Reduce shading-area and just require gate electrode width as far as possible little, the series resistance that reduces battery just requires the gate electrode cross section as far as possible large.Traditional preparation method adopts silk-screen printing technique, and as previously mentioned, this technique can not guarantee its depth-width ratio at printing gate line electrode width hour, and gate electrode width, usually more than 80 microns, is highly 5～30 microns.The embodiment of the present invention, in conjunction with the principle of electrohydrodynamic spray printing, adopts Electrospun directly to write the method for gate line electrode, can obtain thinner gate electrode, and have larger depth-width ratio.In the embodiment of the present invention, first grid electrode width is at 5～50 μ m, and height is at 0.8～30 μ m., can make light generation diffraction, thereby reduce shaded area during at several microns when first grid electrode width, improve conversion efficiency.
Fig. 2 is the structural representation of the device for preparing the solar cell gate electrode that provides of the embodiment of the present invention, comprising: silver slurry feedway 1, nozzle height adjustment module 2, nozzle 3, program-controlled high pressure generator 4, absorption platform 5, motion platform 6, solar base plate 7, control unit 8.Silver slurry feedway 1 is that nozzle 3 is supplied with the silver slurry, and provides Electrospun required back pressure.Nozzle height adjustment module 2 is for the height of fine adjustment nozzle 3.The height of nozzle 3 is defined as the distance that spray printing is printed end distance solar cell to be printed.Nozzle 3 has been the direct executive component of printing gate electrode, comprises and prints end, and the silver slurry is supplied with interface and electrical interface.Nozzle 3 will plate metal, for setting up electric field.The effect of nozzle 3 is: as the positive pole of high voltage electric field, make the silver slurry at spray nozzle front end, print end and form taylor cone, and further pull wire vent.High pressure generator 4 for adding high pressure between nozzle 3 and substrate.High pressure generator 4 connection control units 8, can facilitate adjusting to voltage in computer terminal.Absorption platform 5 is for adsorbing fixing solar base plate 7 to be printed.Motion platform 6 is done rectilinear motion for driving solar base plate 7, to complete gate electrode figure, prints.Coordinate control unit can complete the printing of expectation gate electrode figure.Control unit 8, be comprised of control card and industrial computer, makes whole system can pass through computer interface, Realtime program voltage, highly, and the technological parameters such as speed, the digit control of grid line is printed in realization.
Nozzle height adjustment module 2 comprises motor, slide block and screw mandrel.Nozzle 3 be fixedly connected with slide block on.Control driven by motor screw mandrel and slide block movement by control unit 8.
Nozzle 3 can be single-nozzle, can be also the nozzle of a plurality of array arrangements, as shown in Figure 3.In principle, single-nozzle can reach the purpose that improves conversion efficiency, and simple in structure.But single injector exists, and need to repeatedly print, and printing effect is low.The nozzle of a plurality of array arrangements can complete the printing gate electrode by single, and efficiency is high.Spray nozzle front end is for printing end, its with 7 of solar base plates apart from the technological parameter that need control for us---highly.Described nozzle is that metallic nozzle or front end are coated with metal.Described nozzle need leave electrical interface, and is connected with high pressure generator is anodal.It is silver slurry input that the silver slurry of described nozzle is supplied with interface, with silver slurry feedway, is connected.
In embodiments of the present invention, when the solar cell of printing is flexible thin-film solar cell, by the reel-to-reel device, replace motion platform to complete the feeding that band is printed solar cell.Adopt the feeding mode of reel-to-reel to print, enhance productivity.Now, print continuously grid line.Motion platform and absorption platform are not all worked, but will guarantee that absorption platform connects the negative pole of high pressure generator.As shown in Figure 4, reel-to-reel device 9 comprises emptying roller 90, feed rolls 91, and material receiving roller 92 forms.Now, the flexible solar of gate electrode to be printed volume is positioned on emptying roller 90.Reel-to-reel device 9 and control unit 8 electrical connections.The speed of controlling feed rolls 91 by control unit 8 drives 92 motions from emptying roller 90 to material receiving roller of flexible solar film, and at nozzle, 3 places complete the printing gate electrode.Solar cell after the printing gate electrode is rolled by material receiving roller 92.During this time, motion platform and absorption platform are not all worked, but will guarantee that absorption platform connects the negative pole of high pressure generator.The method can realize ceaselessly printing continuously grid line, and the continuous manufacture of flexible solar battery, enhance productivity.
In embodiments of the present invention, Fig. 5 is that the substrate feed speed is 200mm/s, and nozzle height is 15mm, and when voltage is 1.5kv, the columns of different spray nozzles array brings the variation of printed grating spacing; The grating spacing 4mm that Fig. 5 (a) prints for the single file nozzle, Fig. 5 (b) is the grating spacing 2mm that two row nozzles are printed; Can reduce to print by the columns that increases nozzle array the spacing of grid line.Fig. 6 is that nozzle diameter is 150 μ m, and the substrate feed speed is 200mm/s, when voltage is 1.5kv, and different spray nozzles height, the grid line height difference of printing; Fig. 6 (a) nozzle height is 8mm, and the grid line height of printing is 15 μ m; Fig. 6 (b) nozzle height is 15mm, and its grid line height is 20 μ m; In the situation that other conditions are identical, increase nozzle height, the height of printing grid line increases, thereby has increased depth-width ratio.Fig. 7 is that nozzle diameter is 150 μ m, and when voltage is 1.5kv, nozzle height is 15mm, different substrate feed speed, the grid line width difference of printing; Fig. 7 (a) speed is 150mm/s, and the grid line width of printing is 48 μ m; Fig. 7 (b) speed is 300mm/s, and its grid line width is 30 μ m; For in the situation that other conditions are identical, increase the speed of printing cell substrates, the grid line width of printing reduces; Fig. 8 is that the substrate feed speed is 200mm/s, and when voltage is 1.5kv, nozzle height is 15mm, different spray nozzles diameter, the grid line width difference of printing; Fig. 8 (a) nozzle diameter is 400 μ m, and the grid line width of printing is 100 μ m; Fig. 8 (b) nozzle diameter is 100 μ m, and its grid line width is 30 μ m; In the situation that other conditions are identical, increase nozzle height, the height of printing grid line increases, thereby has increased depth-width ratio.
In the embodiment of the present invention, the grid line width minimum of the solar energy gate electrode that adopts the said equipment to prepare approaches submicron-scale, makes the light of a lot of wavelength in visible ray that diffraction can occur, and reduces shaded area.And there is large depth-width ratio.Thereby improved the efficiency of solar cell.
The embodiment of the present invention has also proposed a kind of method of utilizing electrostatic spinning process directly to write the solar cell gate electrode, and described method is specially:
(1) solar base plate 7 is arranged on absorption platform;
(2) prepare first grid electrode:
(2.1) nozzle 3 that is 100～400 microns by diameter is arranged on nozzle height adjustment module 2, and the electrical interface of described nozzle 3 is connected with high pressure generator 4, the silver of nozzle 3 slurry is supplied with to interface and be connected with 1, and the printing end of nozzle 3 is perpendicular to substrate;
(2.2) control unit 8 output the first control signals are controlled silver slurry feedway 1 to injecting the silver slurry in the cavity volume of described nozzle 3;
(2.3) in control unit 8 output the second control signal Control Nozzle electronic controlled height adjustments 2, slide block slides along screw mandrel, and regulating nozzle 3 array height is 0.5～2cm;
(2.4) control unit 8 output the 3rd control signals are controlled high pressure generator 4 between nozzle 3 and absorption platform 5, applying voltage; Voltage is set to 0.8～2kv.
(2.5) control unit 8 output the 4th control signal controlled motion platforms move with the speed of 150～300mm/s along X-direction, and form first grid electrode;
(3) prepare the second gate electrode
(3.1) nozzle 3 that is 500～1000 microns by diameter is arranged on nozzle height adjustment module 2, and the electrical interface of described nozzle 3 is connected with high pressure generator 4, the silver of described nozzle 3 slurry is supplied with to interface and be connected with silver slurry feedway 1, the printing end of nozzle 3 is perpendicular to substrate;
(3.2) control unit 8 output the first control signals are controlled silver slurry feedway 1 to injecting the silver slurry in the cavity volume of nozzle 3;
(3.3) in control unit 8 output the second control signal Control Nozzle electronic controlled height adjustments 2, slide block slides along screw mandrel, and regulating the nozzle array height is 0.5～1cm;
(3.4) control unit 8 output the 3rd control signals are controlled high pressure generator 4 between nozzle and 5, applying voltage; Voltage is set to 0.8～2kv.
(3.5) control unit 8 output the 4th control signal controlled motion platforms 6 move with the speed of 80～200mm/s along Y-direction, and form the second gate electrode.
Wherein, the width of second gate electrode is greater than the width of first grid electrode, and the spacing between two first grid electrodes is less than two spacings between the second gate electrode.
In embodiments of the present invention, control unit 8 comprises motion control card and industrial computer, can realize exporting the first control signal and control silver slurry feedway 1 to injecting the silver slurry in the cavity volume of nozzle 3; Export slide block in the second control signal Control Nozzle electronic controlled height adjustment 2 and slide along screw mandrel, export the 3rd control signal and control high pressure generator 4 between nozzle and 5, applying voltage; Exporting the 4th control signal controlled motion platform 6 moves with certain speed along X-direction or Y-direction.
The method for preparing back electrode of solar cell that the embodiment of the present invention provides is utilized Electrospun directly to write technique and is printed the solar energy electrode.Electrospun technology utilization electric field pulls into by the slurry of the silver in nozzle the silk that diameter is less than nozzle diameter.By controlling different voltage, nozzle height, and the substrate feed speed can be controlled grid line width and the height printed.Wherein, the stability of taylor cone under the voltage influence certain altitude.Highly mainly by affecting the skyborne state of cure of grid line, affect the height of printing grid line, in the situation that other conditions are constant, highly higher printed grid line height is higher.The width of grid line is printed in the impact of substrate feed speed major effect, in the situation that other conditions are constant, speed is larger, and grid line is thinner.
The method that the embodiment of the present invention provides is compared with the traditional silk-screened method, printable thinner grid line, and can reach larger depth-width ratio, and more save the silver slurry, digit control is printed width and the height of grid line.As optimization method, adopt the nozzle array single to complete the gate electrode printing, improved production efficiency.
In the present invention, the solar energy gate electrode structure that adopts above-mentioned method to prepare, grid line width minimum approaches submicron-scale, makes the light of a lot of wavelength in visible ray that diffraction can occur, and reduces shaded area.And described grid line has large depth-width ratio.Improved the efficiency of solar cell.
For further specific explanations explanation the present invention, below provided four embodiment, owing to printing, solar energy back electrode main grid line is the same with thin grid line technique, therefore in embodiment, a printing for thin grid line (being first grid electrode) is illustrated.
Embodiment 1: now will print a length of side is 125mm, the n that diagonal angle is 165mm
+the top electrode of p-type single crystal silicon solar cell, electrode material is the silver slurry, and its volume resistivity is 3.0u Ω .cm, according to solar cell grid optimum theory and technologic restriction, calculate the spacing that requires thin grid line and be controlled at the 2.5mm left and right, highly be controlled between 10-30um.Further, adopt the array nozzle, enhance productivity.
Concrete steps are as follows:
(1) nozzle array adopts two row layouts, equidistantly place, every row has 25 nozzles, and the distance between nozzle is arranged to 5mm, nozzle diameter is selected 200um, the thin grating spacing of the theory printed like this is 2.5mm, and width and cell piece width that nozzle can be printed are equal, and single is printed the printing that can complete thin grid.
(2) solar battery sheet of grid line to be printed is placed on absorption platform, adsorbs.
(3) the silver slurry that will print is added in the cavity volume of nozzle, be full of Metallic Nozzle At The Ingot.And nozzle and high pressure generator positive pole are connected, and voltage is set to 1kV;
(4) regulate the nozzle array height, will highly be set to 1cm;
(5) motion platform X-direction movement velocity being set is 300mm/s;
(6) start to print, utilize the Keyence Laser Scanning Confocal Microscope to record thin gate height for 15um, width is 30um, reaches ideal effect, completes printing.
Embodiment 2: on the basis of embodiment 1, the height of thin grid is controlled between 15-20um, Reparametrization is as follows:
(1) nozzle array adopts two row layouts, equidistantly place, every row has 25 nozzles, and the distance between nozzle is arranged to 5mm, nozzle diameter is selected 300um, the thin grating spacing of the theory printed like this is 2.5mm, and width and cell piece width that nozzle can be printed are equal, and single is printed the printing that can complete thin grid.
(2) solar battery sheet of grid line to be printed is placed on absorption platform, adsorbs.
(3) the silver slurry that will print is added in the cavity volume of nozzle, be full of Metallic Nozzle At The Ingot.And nozzle and high pressure generator positive pole are connected, and voltage is set to 1.5kV;
(4) regulate the nozzle array height, will highly be set to 1.5cm;
(5) motion platform X-direction movement velocity being set is 250mm/s;
(6) start to print.Utilize the Keyence Laser Scanning Confocal Microscope to record thin gate height for 18um, width is 35um, reaches ideal effect, completes printing.
Embodiment 3: the n that now will print a 20mm * 20mm
+the top electrode of p-type single crystal silicon solar cell, electrode material is the silver slurry, and its volume resistivity is 3.0u Ω .cm, according to solar cell grid optimum theory and technologic restriction, calculate the spacing that requires thin grid line and be controlled at the 2mm left and right, highly be controlled between 20-30um.
Concrete steps are as follows:
(1) nozzle array adopts single-row layout, totally 10 nozzles, equidistantly place, and the distance between nozzle is arranged to 2mm, nozzle diameter is selected 400um, the thin grating spacing of the theory printed like this is 2mm, and width and cell piece width that nozzle can be printed are equal, and single is printed the printing that can complete thin grid.
(2) solar battery sheet of grid line to be printed is placed on absorption platform, adsorbs.
(3) the silver slurry that will print is added in the cavity volume of nozzle, be full of Metallic Nozzle At The Ingot.And nozzle and high pressure generator positive pole are connected, as far as possible thin for guaranteeing thin grid line, voltage is set to 0.8kV;
(4) regulate the nozzle array height, will highly be set to 0.5cm;
(5) motion platform X-direction movement velocity being set is 200mm/s;
(6) start to print.Utilize Keyence confocal microscopy printed solar cell gate pitch and thickness, recording thin gate pitch is 2.1mm, and width is 43um, is highly 21um, meets preset range 20-30um.Print successfully.
Embodiment 4: on the basis of embodiment 3, change nozzle height and voltage, observe the variation of the thin gate parameters of solar cell.Concrete steps are as follows:
(1) nozzle array adopts single-row layout, totally 10 nozzles, equidistantly place, and the distance between nozzle is arranged to 2mm, nozzle diameter is selected 100um, the thin grating spacing of the theory printed like this is 2mm, and width and cell piece width that nozzle can be printed are equal, and single is printed the printing that can complete thin grid.
(2) solar battery sheet of grid line to be printed is placed on absorption platform, adsorbs.
(3) the silver slurry that will print is added in the cavity volume of nozzle, be full of Metallic Nozzle At The Ingot.And nozzle and high pressure generator positive pole are connected, as far as possible thin for guaranteeing thin grid line, voltage is set to 2kV;
(4) regulate the nozzle array height, will highly be set to 2cm;
(5) motion platform X-direction movement velocity being set is 150mm/s;
(6) start to print.Utilizing Keyence confocal microscopy printed solar cell gate pitch and thickness, find that thin gate pitch is 2.1mm, is highly 28um, than the height in embodiment 3, slightly increase, and the grid line width attenuates, and be 27um.
Succinct in order to narrate, the data of main grid line in embodiment 1-4 (being the second gate electrode) are as shown in following table one:
Table one
The method for preparing back electrode of solar cell provided by the invention is utilized Electrospun directly to write technique and is printed the solar energy electrode.Electrospun technology utilization electric field pulls into by the slurry of the silver in nozzle the silk that diameter is less than nozzle diameter.By controlling different voltage, nozzle height, and the substrate feed speed can be controlled grid line width and the height printed.Wherein, the stability of taylor cone under the voltage influence certain altitude.Highly mainly by affecting the skyborne state of cure of grid line, affect the height of printing grid line, in the situation that other conditions are constant, highly higher printed grid line height is higher.The width of grid line is printed in the impact of substrate feed speed major effect, in the situation that other conditions are constant, speed is larger, and grid line is thinner.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a device for preparing the solar cell gate electrode, it is characterized in that, comprise silver slurry feedway (1), nozzle height adjustment module (2), nozzle (3), program-controlled high pressure generator (4), absorption platform (5), motion platform (6) and control unit (8);
Described nozzle (3) comprises prints end, and the silver slurry is supplied with interface and electrical interface;
The input control end of described silver slurry feedway (1) is connected with control unit (8), the output control terminal of silver slurry feedway (1) is supplied with interface with the silver of nozzle (3) slurry and is connected, and described silver slurry feedway (1) for starching and provide required back pressure for Electrospun for described nozzle (3) provides silver-colored under the control of described control unit;
One end connection control unit (8) of nozzle height adjustment module (2), the other end of nozzle height adjustment module (2) connects nozzle (3), and described nozzle height adjustment module (2) is printed the height between end and solar base plate (7) for the spray printing of regulating described nozzle (3) under the control of described control unit;
The output plus terminal of described high pressure generator (4) is connected to the electrical interface of described nozzle (3), the output negative terminal of described high pressure generator (4) connects described absorption platform (5), the input control end of described high pressure generator (4) is connected to described control unit (8), described high pressure generator (4) is under the control of described control unit, at described nozzle be adsorbed between the substrate on absorption platform (5) and apply voltage, form high voltage electric field, make the silver slurry form taylor cone at the printing end of described nozzle, and further pull wire vent under the effect of high voltage electric field;
The control end of described motion platform (6) is connected to described control unit (8), described absorption platform (5) is arranged on described motion platform (6), described motion platform (6) is under the control in described control unit (8), the substrate that drive is adsorbed on absorption platform (5) is done rectilinear motion, completes gate electrode figure and prints.
2. device as claimed in claim 1, is characterized in that, the nozzle that described nozzle (3) is single-nozzle or a plurality of array arrangements.
3. device as claimed in claim 1, is characterized in that, also comprises: be arranged at the insulating barrier between absorption platform and solar base plate (7).
4. device as claimed in claim 1, is characterized in that, also comprises: the reel-to-reel device that is arranged at described absorption platform top.
5. a method for preparing the solar cell gate electrode, is characterized in that, comprises the steps:
(1) solar base plate is arranged on absorption platform;
(2) prepare first grid electrode
(2.1) nozzle that is 100～400 microns by diameter is arranged on the nozzle height adjustment module, and the electrical interface of described nozzle is connected with high pressure generator, the silver of described nozzle slurry is supplied with to interface and be connected with silver slurry feedway, the printing end of described nozzle is perpendicular to described solar base plate;
(2.2) control unit is exported the first control signal and is controlled silver slurry feedway to injecting the silver slurry in the cavity volume of described nozzle;
(2.3) control unit is exported slide block in the second control signal Control Nozzle electronic controlled height adjustment and is slided along screw mandrel, and regulating the nozzle array height is 0.5～2cm;
(2.4) control unit output the 3rd control signal is controlled high pressure generator between nozzle and absorption platform, applying voltage; Voltage is set to 0.8～2kv;
(2.5) control unit output the 4th control signal controlled motion platform moves with the speed of 150～300mm/s along X-direction, and forms first grid electrode;
(3) prepare the second gate electrode according to the step of preparation first grid electrode, the width of described second gate electrode is greater than the width of described first grid electrode.
6. method as claimed in claim 5, is characterized in that, the step (3) for preparing the second gate electrode specifically comprises:
(3.1) nozzle that is 500～1000 microns by diameter is arranged on the nozzle height adjustment module, and the electrical interface of described nozzle is connected with high pressure generator, the silver of described nozzle slurry is supplied with to interface and be connected with silver slurry feedway, the printing end of described nozzle is perpendicular to described solar base plate;
(3.2) control unit is exported the first control signal and is controlled silver slurry feedway to injecting the silver slurry in the cavity volume of described nozzle;
(3.3) control unit is exported slide block in the second control signal Control Nozzle electronic controlled height adjustment and is slided along screw mandrel, and regulating the nozzle array height is 0.5～1cm;
(3.4) control unit output the 3rd control signal is controlled high pressure generator between nozzle and absorption platform, applying voltage; Voltage is set to 0.8～2kv.
(3.5) control unit output the 4th control signal controlled motion platform moves with the speed of 80～200mm/s along Y-direction, and forms the second gate electrode.
7. method as claimed in claim 5, is characterized in that, the width of described first grid electrode is 5 μ m～50 μ m, and the height of described first grid electrode is 0.8 μ m～30 μ m.
8. as the described method of claim 5-7 any one, it is characterized in that, the spacing between two first grid electrodes is less than two spacings between the second gate electrode.
9. a solar energy gate electrode structure that adopts the described method of claim 5-8 any one to prepare.
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