KR101868638B1 - Paste composition for front electrode of silicon solar cell - Google Patents
Paste composition for front electrode of silicon solar cell Download PDFInfo
- Publication number
- KR101868638B1 KR101868638B1 KR1020120025453A KR20120025453A KR101868638B1 KR 101868638 B1 KR101868638 B1 KR 101868638B1 KR 1020120025453 A KR1020120025453 A KR 1020120025453A KR 20120025453 A KR20120025453 A KR 20120025453A KR 101868638 B1 KR101868638 B1 KR 101868638B1
- Authority
- KR
- South Korea
- Prior art keywords
- conductive metal
- powder
- solar cell
- weight
- monomethyl ether
- Prior art date
Links
Images
Classifications
-
- 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
Abstract
The present invention relates to a paste composition for forming a front electrode of a silicon solar cell. The metal paste composition for a front electrode comprising a conductive metal powder, a glass frit powder and an organic vehicle according to the present invention is characterized by including a conductive metal nano-particle powder having an average particle diameter of 500 nm or more and less than 1.0 m and an N-type diffusion agent . The silicon solar cell manufactured using the paste composition for forming the front electrode of the solar cell according to the present invention has a high efficiency conversion efficiency.
Description
The present invention relates to a paste composition for a front electrode of a silicon solar cell, and more particularly, to a silicon solar cell front which can increase the efficiency of a solar cell by providing a low resistance and a contact resistance of an electrode by exhibiting a high sintering density and a low sintering shrinkage ratio after sintering Electrode paste composition.
In general, the solar cell is created and the (P, Phosphorus), which emitter layer (n + layer), diffusion and the like in the p-type Si substrate made of single crystal or polycrystalline silicon (Si) SiN for reducing surface reflection has its upper x or SiO 2, etc., and a reflective surface electrode for extracting the film and the current (light-receiving surface electrode) is formed consisting, BSF (p + layer) in which diffusion of aluminum (Al), etc. on the other side with a high concentration of the Si substrate is formed , And an electrode is formed on the back surface thereof. That is, when a light is incident on a solar cell having a junction structure of a p-type semiconductor and an n-type semiconductor, electrons charged with (-) electrons jump out due to interaction with light and a material constituting the semiconductor of the solar cell, (+) Charge, that is, a hole, is generated in the place where the current flows, and a current flows due to the potential difference therebetween.
In order to improve the power generation efficiency of the solar cell, various factors such as the materials used in the devices of the solar cells, the process conditions, and the like can be controlled. In particular, in order to improve the power generation characteristics of the solar cell, . For example, by lowering the resistance value of the electrode, the power generation efficiency can be enhanced. In the case of the front electrode, the efficiency of the front electrode can be increased by widening the light receiving area.
In particular, the front electrode is formed through an interfacial reaction between the metal paste for forming the front electrode and the antireflection film, and the silver contained in the metal paste becomes a liquid at a high temperature and then recrystallized to a solid phase, And then comes into contact with the emitter layer through a punch through phenomenon through the antireflection film. However, in the interface reaction on the antireflection film forming the conventional front electrode, there is a limitation in the degree of sintering of silver, which has problems in improving the performance of the front electrode or reducing the area thereof.
In order to solve the above problems, Korean Patent Laid-Open Publication No. 2005-0087248 discloses that by using silver powder of 100 nm or less, the use of glass frit is excluded to lower the contact resistance and the firing temperature between the electrode and the substrate, Respectively. However, the method proposed in the above patent fails to provide an improved solar cell efficiency to a satisfactory extent, and physical defects such as cracks are generated after firing, resulting in a low sintered density and a problem of being vulnerable to long-term reliability Respectively. Therefore, it is urgent to develop additional technology that can further improve the performance of the front electrode.
It is an object of the present invention to provide a paste composition for a front electrode of a silicon solar cell which exhibits a high sintered density and a low sintering shrinkage ratio after sintering in electrode fabrication to increase the efficiency of the solar cell by providing a low resistance and a contact resistance of the electrode .
It is another object of the present invention to provide a paste composition capable of increasing the conversion efficiency of a solar cell by reducing the area occupied by the front electrode by forming an electrode having a high aspect ratio in the production of the front electrode by the screen printing method.
In order to achieve the above object, the present invention provides a paste composition for a front electrode for a solar cell including a metal powder, a glass frit powder, an organic vehicle and an additive, comprising a conductive metal nano-particle powder having an average particle diameter of 500 nm or more and less than 1.0 m, And an N-type diffusing agent containing a phosphorous (P) element in a stable state on the surface of the silicon solar cell front electrode.
Specifically, the paste composition for a front electrode of a silicon solar cell according to the present invention comprises (A) 50 to 90% by weight of a conductive metal powder, (B) 1 to 15% by weight of organic frit; (C) 4 to 35% by weight of an organic vehicle; And (D) 0.5 to 2% by weight of an N-type diffusing agent comprising a phosphorous (P) element which is in a stable state on the solution.
The present invention also provides a paste composition for a front electrode of a silicon solar cell, which comprises, as a total weight of the composition, (A) a conductive metal powder having a mean particle diameter of 500 nm or more and less than 1.0 m, 50 to 90% by weight of a mixed powder in which a conductive metal powder having a particle diameter of less than 1 占 퐉 is mixed at a weight ratio of 1: 0.1 to 10; (B) 1 to 15% by weight of an organic frit powder; (C) 4 to 35% by weight of an organic vehicle; And (D) 0.5 to 2 wt% of an N-type diffusing agent comprising a phosphorous (P) element in a stable state on the solution.
Each component of the paste composition of the present invention will be described below.
(A) Conductive metal powder
The paste composition of the present invention is characterized by containing a conductive metal nano-particle powder having an average particle diameter in a range of 500 nm or more and less than 1.0 mu m, and it is preferable that the conductive metal nano-particle powder is used singly or in combination with the micro- .
In the present invention, 50 to 90% by weight of the conductive metal nano-particle powder having an average particle diameter of 500 nm or more and less than 1.0 mu m based on the total weight of the composition may be used. If the average particle diameter of the conductive metal nano-particles of the present invention is larger than the above range, resistance can be increased since a high sintered density can not be obtained after firing. If the average particle diameter is less than the above range, there is a problem in dispersibility in an organic vehicle, It is hard to get.
The present invention also provides a mixed powder 50 in which a conductive metal nano-particle powder having an average particle diameter of 500 nm or more and less than 1.0 mu m and a conductive metal powder having an average particle diameter of 1.0 mu m or more and less than 10 mu m are mixed in a weight ratio of 1: To 90% by weight can be used. When the conductive metal powder is mixed at the above weight ratio, the efficiency of the solar cell is further improved. When a silver powder is used as the conductive metal powder having an average particle diameter of 1.0 μm or more and less than 10 μm, it is preferably at least one selected from spherical and flake types.
The conductive metal may be selected from the group consisting of Ag, Au, Pd, Pt, Cu, Cr, Co, Al, Sn, At least one selected from the group consisting of Pb, Zn, Fe, Ir, Os, Rh, W, Mo, May be used, but silver (Ag) is preferably used.
The conductive metal powder of the present invention is used in an amount of 50 to 90 wt% based on the total weight of the composition. When it is less than 50% by weight, phase separation or viscosity is lowered, and there is a problem of printing property, and the metal component is insufficient and sufficient electric conductivity can not be obtained. When the amount of the conductive metal powder exceeds 90% by weight, the viscosity is high and the printing property becomes difficult.
(B) Glass Frit
The paste composition of the present invention includes glass frit which is conventionally used as an inorganic binder in solar cell electrode pastes. The glass frit may be at least one selected from Bi 2 O 3 , B 2 O 3 , SiO 2 , Al 2 O 3 , CaO, BaO, ZnO, Na 2 O, Li 2 O, PbO, TiO 2 and ZrO desirable. It is appropriate to use a glass frit having a particle diameter of about 1.0 to 10 mu m.
The glass frit of the present invention is preferably used in the range of 1 to 15% by weight based on the total weight of the composition. Within the above range, there is an advantage of facilitating the adhesion and sintering of the solar cell electrode paste.
(C) Organic Vehicle
The paste composition according to the present invention comprises an organic vehicle in the mixed powder for mixing into the powder components and making into a paste state suitable for screen printing processes for forming electrodes. The organic vehicle may be an organic vehicle ordinarily used for a solar cell electrode paste, for example, a mixture of a polymer and a solvent. Preferably, the organic vehicle is selected from the group consisting of butyl carbitol acetate, butyl carbitol, butyl cellosolve, butyl cellosolve acetate, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether propionate, ethyl ether pro In at least one solvent selected from the group consisting of methyl ethyl ketone, methyl ethyl ketone, methyl ethyl ketone, gamma-butyrolactone, ethyl lactate and Texanol, ethyl cellulose, methyl Cellulose resins such as cellulose and nitrocellulose, acrylic resins such as polymethacrylate and acrylic ester of rosin or alcohol, and polyvinyl resins such as polyvinyl alcohol and polyvinyl butyral are added It is.
The organic vehicle of the present invention is preferably contained within the range of 4 wt% to 35 wt% with respect to the total composition. When the amount is less than 4% by weight, not only the metal powder can not be dispersed but also the printing becomes difficult, which may cause a problem that a suitable print pattern can not be obtained. On the other hand, if the amount is more than 35% by weight, the content of the metal powder is too small to lower the electrical conductivity and the conversion efficiency of the solar cell may decrease due to the increase of the resistance due to the residual carbon after firing.
(D) N-type Diffuser
According to the present invention, the efficiency of the final solar cell can be improved by adding an N-type diffusing agent. The N-type diffusing agent of the present invention is not particularly limited as long as it contains a phosphorus (P) element in a stable state in a solution phase, but it is preferable to use P 2 O 5 present in a stable state in a solution phase. The N-type diffusing agent of the present invention is used in an amount of 0.5 to 2% by weight based on the weight of the composition. Within the above range, there is an advantageous effect on the ohmic junction between the front electrode of the solar cell and the silicon wafer.
(E) Other additives
The metal paste composition of the present invention may further include additional additives within the scope of the present invention. Examples of other additives that can be added include plasticizers, dispersants, thixotropic agents, viscosity stabilizers, antifoaming agents, pigments, ultraviolet stabilizers, and antioxidants. The amount of the additive can be appropriately determined by a person skilled in the art depending on the characteristics of the metal paste ultimately required.
The paste composition for a solar cell front electrode of the present invention can be obtained by blending the essential components and optional components described above in a predetermined ratio and uniformly dispersing the blended components in a kneader such as a blender or a three-axis roll. Preferably, the paste composition for a solar cell front electrode of the present invention has a viscosity of 5 to 100 mPa · s at 5 rpm and 25 ° C. in a multi-purpose cup using a Brookfield HBT viscometer and # 51 spindle .
In the present invention, since the electrode is formed using the paste containing the conductive metal nano-particles having an average particle diameter of 500 nm or more and less than 1.0 m and the N-type diffusing agent, the electric conductivity is increased by sintering density of the high electrode after firing, The line width of the front electrode can be reduced by a high aspect ratio, thereby reducing the incident light loss of the solar cell. The silicon solar cell manufactured using the paste composition for forming a front electrode according to the present invention has a high efficiency conversion efficiency.
1 is a SEM photograph of a front electrode made of a metal paste manufactured according to Example 1 of the present invention.
2 is a SEM photograph of a front electrode made of a metal paste manufactured according to Example 2 of the present invention.
3 is a SEM photograph of a front electrode made of a metal paste manufactured according to Example 3 of the present invention.
4 is a SEM photograph of a front electrode made of a metal paste manufactured according to Comparative Example 1 of the present invention.
Hereinafter, the present invention will be described in detail with reference to examples and comparative examples. However, the examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1 to 3 and Comparative Example 1-2
Example 1-3
Silver powder, glass frit, organic vehicle and additives were mixed and uniformly stirred according to the composition shown in the following Table 1, and mixed and dispersed in a three-stage roll mill to prepare a metal paste composition.
Comparative Example One
A metal paste composition was prepared in the same manner as in Examples 1 to 3 except that silver powder 2 was used instead of silver powder 1 in Examples 1 to 3.
Comparative Example 2
Silver paste compositions were prepared in the same manner as in Examples 1 to 3 except that the N-type diffusing agent was not used in Examples 1 to 3.
(Unit: wt%)
1: Silver particles having an average particle diameter of 800 nm
2: Silver particles having an average particle diameter of 3.0 μm
3: glass frit (VIOX, V2172) having an average particle diameter of 1.0 μm;
4: Ethyl cellulose: butyl carbitol = 1: 9 Weight ratio of organic vehicle
5: N-type diffusing agent: N-diffusol (Transene Company, US)
Test Example
The paste compositions of Examples 1 to 3 and Comparative Examples 1 and 2 were applied by screen printing to a silicon wafer to a thickness of 40 占 퐉 and dried. The P-type silicon semiconductor substrate coated with the paste composition was dried at 200 캜 and fired at a temperature of 760 to 840 캜 for about 5 seconds to form an electrode, thereby manufacturing a solar cell. The manufactured solar cell was measured for Voc (V), Isc (A), Fill Factor (%) and Eff (Eff) (%) using a solar cell efficiency measuring device (HS- Respectively.
As shown in Table 2, in Examples 1 to 3 using paste compositions containing conductive metal nanoparticles of 500 nm or more and less than 1.0 μm, a paste containing no conductive metal nanoparticles of 500 nm or more and less than 1.0 μm It was confirmed that the efficiency of the solar cell was superior to that of Comparative Example 1 using the composition. In Example 2 in which nanoparticles having a diameter of 500 nm or more and less than 1.0 μm were mixed with silver particles having a diameter of 1.0 μm or more and less than 10 μm, Respectively. In particular, from the results of Example 2 and Comparative Example 2, it was confirmed that the composition of the present invention can improve the conversion efficiency of the solar cell more than the case where the N-type diffusing agent is not applied.
SEM photographs of cross-sectional SEMs of the front electrodes of the solar cells according to Examples 1 to 3 and Comparative Example 1 are shown in Fig. 1 to Fig. 4, respectively. 1 to 4, it was confirmed that the high aspect ratio of the solar cell front electrode manufactured from the paste composition of the present invention was realized as compared with Comparative Example 1 in which nanoparticles of 500 nm or more and less than 1.0 μm were not used.
Claims (8)
(A) a conductive metal powder, comprising 50 to 90% by weight of a conductive metal nano-particle powder having an average particle diameter of 500 nm or more and less than 1.0 mu m;
(B) 1 to 15% by weight of organic frit;
(C) 4 to 35% by weight of an organic vehicle; And
(D) 0.5 to 2 wt% of an N-type diffusing agent containing a phosphorus (P) element in a stabilized state on a solution.
(A) 50 to 90 wt% of a conductive metal powder;
(B) 1 to 15% by weight of an organic frit powder;
(C) 4 to 35% by weight of an organic vehicle; And
(D) 0.5 to 2 wt% of an N-type diffusing agent containing a phosphorus (P) element in a stable state on a solution,
Wherein the conductive metal powder is a mixed powder in which spherical conductive metal nano-particle powders having an average particle diameter of 500 nm or more and less than 1.0 mu m and spherical conductive metal powders having an average particle diameter of 1.0 mu m or more and less than 10 mu m are mixed,
Wherein the mixed powder comprises a spherical conductive metal nano-particle powder having an average particle diameter of 500 nm or more and less than 1.0 mu m in an amount larger than a spherical conductive metal powder having an average particle diameter of 1.0 mu m or more and less than 10 mu m, Paste composition.
Wherein the conductive metal (A) is at least one selected from the group consisting of Ag, Au, Pd, Pt, Cu, Cr, Co, ) From a group consisting of lead (Pb), zinc (Zn), iron (Fe), iridium (Ir), osmium (Os), rhodium (Rh), tungsten (W), molybdenum Wherein the silicon solar cell is a silicon solar cell.
Wherein the conductive metal (A) is silver (Ag).
The organic frit powder (B) is one selected from Bi 2 O 3 , B 2 O 3 , SiO 2 , Al 2 O 3 , CaO, BaO, ZnO, Na 2 O, Li 2 O, PbO, TiO 2 and ZrO By weight based on the total weight of the composition.
The organic vehicle (C) may be selected from the group consisting of butyl carbitol acetate, butyl carbitol, butyl cellosolve, butyl cellosolve acetate, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether propionate, (S) selected from the group consisting of cellulose-based resin (s) in at least one solvent selected from the group consisting of propylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether acetate, Wherein at least one resin selected from the group consisting of an acrylic resin and a polyvinyl resin is added.
Wherein the (D) N-type diffusing agent is liquid P 2 O 5 .
Wherein the composition further comprises at least one additive selected from the group consisting of plasticizers, dispersants, thixotropic agents, viscosity stabilizers, antifoaming agents, pigments, ultraviolet stabilizers and antioxidants.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120025453A KR101868638B1 (en) | 2012-03-13 | 2012-03-13 | Paste composition for front electrode of silicon solar cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120025453A KR101868638B1 (en) | 2012-03-13 | 2012-03-13 | Paste composition for front electrode of silicon solar cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20130104177A KR20130104177A (en) | 2013-09-25 |
| KR101868638B1 true KR101868638B1 (en) | 2018-06-19 |
Family
ID=49453059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020120025453A KR101868638B1 (en) | 2012-03-13 | 2012-03-13 | Paste composition for front electrode of silicon solar cell |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101868638B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101853420B1 (en) * | 2016-10-13 | 2018-04-30 | 엘에스니꼬동제련 주식회사 | Silver powder sintered at high temperature and method of manufacturing the same |
| CN108986984B (en) * | 2018-06-07 | 2020-07-28 | 太仓萃励新能源科技有限公司 | Preparation method of N-type conductive slurry |
| KR102326611B1 (en) * | 2018-07-06 | 2021-11-16 | 창저우 퓨전 뉴 머티리얼 씨오. 엘티디. | Composition for forming solar cell electrode and electrode prepared using the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006003755A1 (en) * | 2004-07-06 | 2006-01-12 | Murata Manufacturing.Co., Ltd. | Electroconductive paste and ceramic electronic parts using the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101280489B1 (en) * | 2007-05-09 | 2013-07-01 | 주식회사 동진쎄미켐 | A paste for producing electrode of solar cell |
| JP4868079B1 (en) * | 2010-01-25 | 2012-02-01 | 日立化成工業株式会社 | N-type diffusion layer forming composition, n-type diffusion layer manufacturing method, and solar cell manufacturing method |
-
2012
- 2012-03-13 KR KR1020120025453A patent/KR101868638B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006003755A1 (en) * | 2004-07-06 | 2006-01-12 | Murata Manufacturing.Co., Ltd. | Electroconductive paste and ceramic electronic parts using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20130104177A (en) | 2013-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101374359B1 (en) | Paste for forming electrode of solar cell and solar cell using the same | |
| EP2472526B1 (en) | Paste composition for electrode of solar cell and solar cell including the same | |
| KR101437143B1 (en) | Paste composition for forming electrode of solar cell, electrode fabricated using the same and solar cell using the same | |
| EP1713093A2 (en) | Electroconductive thick film composition, electrode, and solar cell formed therefrom | |
| US20110227004A1 (en) | Paste for solar cell electrode and solar cell using the same | |
| JP2012502503A (en) | Solar cell electrode | |
| EP3026674A1 (en) | Composition for forming solar cell electrode, and electrode produced from composition | |
| AU2006201557A1 (en) | Electroconductive thick film composition(s), electrode(s), and semiconductor device(s) formed therefrom | |
| KR101882525B1 (en) | Composition for forming solar cell and electrode prepared using the same | |
| US8562872B2 (en) | Paste for solar cell electrode and solar cell prepared using the same | |
| JP2018049831A (en) | Thick film conductive composition and use thereof | |
| KR20130042524A (en) | Silver paste composition and solar cell using the same | |
| KR101648245B1 (en) | The composition for forming solar cell electrode comprising the same, and electrode prepared using the same | |
| KR20160057583A (en) | Paste for forming solar cell electrode and electrode prepared using the same | |
| KR101868638B1 (en) | Paste composition for front electrode of silicon solar cell | |
| KR101611456B1 (en) | Paste composition for manufacturing solar-cell electrode comprising phosphoric dispersant | |
| KR20140127947A (en) | Composition for forming solar cell electrode and electrode prepared using the same | |
| TW201830714A (en) | Front electrode for solar cell and solar cell comprising the same | |
| US20130160835A1 (en) | Back-side electrode of p-type solar cell and method for forming the same | |
| EP2469542B1 (en) | Paste composition for rear electrode of solar cell and solar cell including the same | |
| US9640298B2 (en) | Silver paste composition for forming an electrode, and silicon solar cell using same | |
| KR20140123205A (en) | Composition for forming solar cell electrode and electrode prepared using the same | |
| KR101845102B1 (en) | Composition for forming solar cell electrode and electrode prepared using the same | |
| KR101930284B1 (en) | Electrode Paste For Solar Cell's Electrode And Solar Cell using the same | |
| KR20110024655A (en) | Composition for foarming solar-cell electrode characterized by low bowing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| E902 | Notification of reason for refusal | ||
| AMND | Amendment | ||
| E601 | Decision to refuse application | ||
| AMND | Amendment | ||
| X701 | Decision to grant (after re-examination) | ||
| GRNT | Written decision to grant |