TW201230064A - Aluminum paste composition and solar cell device using the same - Google Patents

Abstract

Disclosed are an aluminum paste composition and a solar cell device using the same. More particularly, the present invention describes an aluminum paste composition which includes an aluminum powder, a glass frit containing 40 to 80 mol% of ZnO and 20 to 60 mol% of B2O3, and an organic vehicle. Therefore, the inventive aluminum paste composition does not contain PbO components which are restricted in use due to environmental problems, thus being eco-friendly. At the same time, the inventive composition does not include Bi2O3 component having high resistance to thermal etching, thus preventing a reaction with moisture. Consequently, the present invention may improve durability of a solar cell device itself. The present invention also describes a solar cell device manufactured using the foregoing composition.

Description

201230064 VI. Description of the invention: [Technical field to which the invention belongs] [雠1] Related application This application claims to be from Korean Patent Application No. 1 0-2010-0130580 filed with the Korea Intellectual Property Office on December 20, 2010. The priority of the disclosure is hereby incorporated by reference. TECHNICAL FIELD The present invention relates to an aluminum paste composition which does not contain PbO and Bi2〇3 components, and thus is environmentally friendly and has improved durability, and an aluminum paste composition is used. Solar cell device. [Prior Art] [0002] In recent years, solar cells (often known as "batteries") have rapidly spread "and are known as energy sources for the next generation, and for directly converting clean energy, that is, sunlight" into Electronic device for electricity. As shown in FIG. 1, the solar cell device has an N + layer 20, an anti-reflection film 30, and a front electrode 40 provided on the light receiving side of the germanium wafer substrate 10, and is provided on the substrate 1 The structure of the p + layer 50 and the rear electrode 60 on the other side. When the solar cell is irradiated with sunlight, electrons (_) and holes (+) are generated therein, and thus generated electrons are moved to the N + layer, and the hole (1) migrates to the P + layer 50. So, what about? A potential is generated between the +5 layer and the N + layer 20. In this case, a current can be generated by applying a charge thereto, whereby sunlight can be converted into electric energy. In the above description, the material can be manufactured by screen printing or the like by the technique of screen printing or the like, drying and sintering the coated material. The 10014678^早号Α0101 Page 4/23 pages 1013078948 -0 201230064 Rear electrode 60. Here, aluminum is dispersed in the tantalum wafer substrate 10 during the sintering to form an A__Si alloy layer between the back electrode 6〇 and the substrate 1〇, and at the same time, by diffusion of aluminum atoms. The p + layer 5 形成 is formed. This P + layer 50 acts as a back surface field (BSF) to improve carrier collection efficiency while preventing electron re-bonding, and may also have the role of a reflector to reflect long wavelength sunlight. The aluminum slip composition used to make such a back electrode 60 may comprise aluminum powder, glass frit, and a giass vehicle. Among these, the frit is used to reinforce the bonding to the germanium wafer substrate 10, and may generally include

PbO-B2〇3-Si〇2, Pb0-B203-Al 0 and PbO-B90Q-Zn0 oxygen L u compounds are the main components. Recently, due to environmental problems, it has been proposed that Bi2〇3 oxide has a PbO oxide-like characteristic, even though it does not have a Pb〇 composition, such as: Bi2〇3-B2〇3-SiOf^Bi2〇3-B2 〇3-Zn0 oxide. Korean Patent Registration No. 0890866 discloses a 〇5 to 35 weight percent (wt.%) of Si 〇 2, 0 to 5 wt.% of A1 0, 1 to 15 2 3 *1; 〇 to 15 ..% of 211 〇 and 55 to 90 1:1:.% of Bi2〇3 frit. However, the glass frit containing the cerium and lanthanum 3 components thermally etches the oxide film on the surface of the aluminum powder in the aluminum layer, which in turn increases the water content and reactivity. For this reason, the above technique has a problem that the durability of the solar cell device itself is degraded. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an aluminum slip composition which does not contain Pb〇 and a tantalum component, and therefore is environmentally friendly and can prevent reaction with moisture caused by thermal etching. 1013078948-0 10014678 Production Order No. A〇1〇l Page 5 of 23 201230064 Another object of the present invention is to provide an electrode fabricated using the above-described Ming slurry composition. Another object of the present invention is to provide a solar cell device having the above electrode. In order to achieve the above object, the present invention provides the following techniques. (1) An aluminum slip composition comprising: aluminum powder, Zn0 containing 40 to 80 mole percent (mol%), and glass frit of 2 to 6 inches, and an organic transport tool (〇rganic vehicle) . (2) The aluminum slip composition according to the above item (1), wherein the glass frit further comprises at least one group selected from the group consisting of Si〇2, antimony, metal oxides and alkaline earth metal oxides. (3) The aluminum slip slurry composition according to the above item (2), wherein the glass frit contains 2 to 15% by weight of Si〇2, 2 to 15 mol% with respect to a total of 100 mol% of the glass frit. P2〇5, 2 to 1〇m〇i% of the metal oxide and 0 to 10 m〇% of the alkaline earth metal oxide. (4) The aluminum slip composition according to the above item (3), wherein the glass frit contains 40 to 60 m% of ZnO, 20 to 60 mol of WB2〇, and 2 to IS raoU of Si〇£4P2〇 5, 2 to 0 ^ 〇 1% of the metal oxide and 2 to 10 m 〇 1% of the alkaline earth metal oxide. (5) The aluminum slip slurry composition according to the above item (2), wherein the alkali metal oxide is at least one selected from the group consisting of Κ2〇, Ν^〇, and Li/, and the alkaline earth metal oxide The substance is at least one selected from the group consisting of Mg〇, Ca〇,

A group of SrO and BaO. (6) The aluminum slip composition according to the above item (1), wherein the glass frit has a softening point of 300 to 600 °C. (7) The aluminum slip slurry composition according to the above item 1, which comprises 10014678 production order number Π1ίΠ page 6/23 pages 1013078948-0 201230064 65 to 75 wt.% of the powder, Q. From oi to wt.% frit and from 2〇 to 34.9 wt.% of organic shipping tools. (8) The composition according to the above item (1), wherein the powder is a mixture comprising 6 to 95 wt% of a powder having an average particle size of 4 to 6 micrometers (以及) and 5 Up to 4 〇 wt % has another powder of 2 to 4 called 1 average particle size. (9) The aluminum slip composition according to the above item (1), wherein the organic transporting tool is a mixture comprising 1 to 25 wt.% of a polymer resin and 75 to 99 wt.% of an organic solvent. (10) An electrode produced by using the aluminum slip composition according to any one of the above items (A) to (9). (11) A solar cell device having the electrode according to the above item (1). [Embodiment] According to the present invention, there is provided an aluminum powder polymer composition having no pb bismuth and a component, and a solar battery device manufactured using the same. Hereinafter, the present invention will be described in more detail. The composition of the present invention comprises a powder, a glass frit, and an organic transporting tool, and the frit is characterized by simultaneously using zn〇-B2〇3 oxide which does not contain pb〇 and a Bi2〇3 component. More particularly, the frit may comprise 40 to 80 mol% Zn0 and 20 to 60 mo_B2 〇3. Preferably, the powder comprises two mixtures of powder types having different average particle sizes, which are conductive metals as the main component of the powdered composition, and are used in 阙4678 to produce a single number A0101 page 7 / 23 pages 1013078948-0 201230064 Make the back electrode. By fabricating structures on both surfaces of the substrate, the germanium wafer substrate for fabricating the rear electrode has a structure provided with a micropyramid on its surface to increase the surface area for receiving sunlight. Generally, the height of the formed micropyramids is preferably in the range of 2 to 15 μm and the width thereof may range from 2 to 20 Å. The micro-pyramid shows an irregular maze form. The tantalum wafer substrate having such a surface structure is subjected to a series of processes, and specifically includes: the aluminum paste composition by screen printing, gravure printing or offset printing Coating to the substrate; drying the substrate; and sintering the dried substrate 'to make a back electrode. In this regard, if the particle size of the aluminum powder is too large, the interaction between the aluminum paste composition and the tantalum wafer substrate may be poor, and the aluminum paste composition may be printed and dried as well After the germanium wafer substrate, voids may be generated between the aluminum paste composition and the germanium wafer substrate. During the sintering process, the holes pass through the aluminum slip layer and eject the surface. Therefore, aluminum bumps and bubbles are produced. Therefore, it is preferred to use two aluminum powder mixtures having different average particle sizes to minimize the pore size. The aluminum powder may be a mixture comprising 6 to 95 wt.% of a powder having an average particle size of 4 to 6 Å and 5 to 40 wt.% of another powder having an average particle size of 2 to 4 imi. A powder having an average particle size of 4 to 6 _ can suppress shrinkage of the tantalum wafer substrate after sintering to enable fabrication of electrodes of high density and low shrinkage. On the other hand, a powder having an average particle size of 2 to 4 acts as a binder between the two aluminum powders and allows the slurry to penetrate deeply and uniformly to the surface of the substrate having a specific structure. In the example of using the mixture prepared as described above, the porosity between the substrate and the slurry can be reduced, and the back surface electric field can be uniformly formed (in the case of 10014678^单号 ΑίΠί)1 帛8 pages/total 23 pages 1013078948-0 201230064 BSF), and exhibits a reduced resistivity of the back electrode, and the substrate can have a controlled degree of bending. Therefore, the maximum output current (Isc) of the solar cell device can be increased while improving the efficiency of the device. Further, yellowing of the rear electrode can be prevented after sintering. The amount of the powder may be included in an amount of 65 to 75 wt.% with respect to a total of 100 wt.% of the aluminum slip composition. If the amount is less than 65 wt.%, the printed aluminum back electrode after sintering may have a reduced thickness, which in turn causes the formation of BSF to be insufficient and reduces its efficiency. In the case where the amount exceeds 75 wt.%, it is possible to increase too much printing thickness, which in turn causes the germanium wafer substrate to bend. The invention is characterized in that the glass frit contains a specific Zn0-B90g oxide, which does not simultaneously contain PbO and Bi2〇3 components. The glass frit containing the PbO component has an easily controlled melting point and a low coefficient of thermal expansion, however, the use of the frit is limited due to environmental problems. On the other hand, the glass frit containing the B2〇3 component has characteristics similar to the PbO-based glass frit. However, it exhibits an excessive thermal etch back of the aluminum oxide film, thereby reducing the water repellency of the aluminum electrode and ultimately causing a decrease in the durability of the solar cell device. In view of the foregoing, the present invention uses a glass frit comprising 40 to 80 mol% of ZnO and 20 to 60 111〇1% of 690 <3. Preferably, the glass frit may further comprise: an alkali metal oxide such as Si〇2, P2〇5, K20, Na2〇, Li2〇, etc.; or a soil metal oxide such as MgO, CaO, SrO ' BaO or the like, which is preferably used alone or in combination of two or more thereof. Here, the glass frit may contain 2 to 15 mol% of Si〇9, 2 with respect to a total of 100 mol% of the glass frit.

La 1()()146781^单单A0101 Page 9 of 23 1013078948-0 201230064 to 15 mol?^P2〇5, 2 to 10 mol% of alkali metal oxide and 2 to 10 mol% of soil test Metal oxide. More preferably, the glass frit may contain 40 to 60 mol% of ZnO, 20 to 45 mol% of B 0, and 2 to 15 mol% of Si 0#P2〇5, 2 with respect to 100 mol% of the glass frit. Up to 10 mol % of metal oxide and 2 to 10 mol% of alkaline earth metal oxide. Most preferably, the glass frit may contain 40 to 60 mol% of ZnO, 20 to 45 mol% of B 0, 2 to 15 2 3 mol% of Si 2 , 2 to 10 m with respect to 100 frits. 〇1% of an alkali metal oxide and 2 to 1% by mole of an alkaline earth metal oxide. The frit may have a softening point of 300 to 60 (TC). The frit must be melted and give a tight bond between the aluminum slip layer and the tantalum wafer substrate. However, if the softening point exceeds 60 (rc, the The glass frit may not be sufficiently melted during sintering 'thus reducing the adhesion. Relative to a total of 100 Wt.% of the aluminum slip composition, may include 玻璃1 to 1 〇wt. % of the glass frit, more preferably 〇 〇5 to 7 wt. %, and the best is 〇.1 to 5:1.%. If the amount is lower than 〇.〇1*1:.%, after sintering, it is possible to reduce the aluminum rear electrode and 矽Adhesion between wafer substrates. On the other hand, when the amount exceeds 10 wt%, the resistivity increases, thus causing a decrease in the efficiency of the solar cell device. The frit containing the aforementioned components may be environmentally friendly because it is not included Pb〇 component, and at the same time, can prevent the decrease in water repellency caused by thermal etching because it does not contain Bi2〇3 component. On the other hand, the glass frit without PbO and Bi2〇3 components has a high melting point' and then requires a considerable amount Network modifier. Therefore, The thermal expansion coefficient is relatively high, so during the manufacture of the solar cell device, the Bianjingjing® substrate is bent. The number is A0101, and the total number of pages is 1013078948-0 201230064. However, it is manufactured according to the present invention. The frit includes individual components having an optimum relative molar ratio and, therefore, exhibits less bending that is negligible, even if the coefficient of thermal expansion is relatively high. The organic transport tool imparts viscosity to the aluminum slip composition suitable for printing. The modulus and the composition of the rheological properties, and if necessary, the organic transport means may be a solution prepared by dissolving various additives and a polymer resin in an organic solvent. The organic transport tool may be 75 to 99 wt. A mixture of % organic solvent and 1 to 25 wt.% of a polymer resin, and may further include 1 to 10 wt.% of a ruthenium additive.

The organic solvent may be any solvent known in the related art, and in order to prevent drying of the slip composition when controlling the fluidity of the slip composition during printing, the organic solvent may include a boiling point of 150 to 300°. Solvent of C. More specifically, tripropylene glycol methyl ether, tripropylene glycol n-butyl ether, dipropylene glycol n-propyl mystery, dipropylene glycol n-butylene, propylene glycol benzene, diethylene glycol ethyl ether, diethylene glycol n-butyl ether, diethylene glycol Ether, ethylene glycol hexyl ether, triethylene glycol oxime ether, triethylene glycol diethyl ether, triethylene glycol n-butyl ether, ethylene glycol phenyl ether, ethylene glycol, terpineol, butyl carbitol, butyl Carbitol acetate, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (ester alcohol) or the like can be exemplified. These may be used alone or in combination of two or more thereof. An organic solvent may be included in an amount of from 75 to 99 wt.% with respect to a total of 100 wt.% of the organic transport means. Within the foregoing range, the slip composition can have optimum fluidity. The polymer resin may be any polymer resin known in the related art, and includes various resins such as; ethyl cellulose, nitrocellulose 1 () () 14678 - single number A0101 page 11 / total 23 pages 1013078948-0 201230064, phenol, acrylonitrile, rosin, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, polyvinyl butyral, urea, dimethyl stearate, alkyd, unsaturated polyester, Polyimine, furan, urethane, isocyanate, cyanate, polyethylene, polypropylene, polystyrene, acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate, Polyethylene, polyvinylidene chloride, polyvinyl acetate, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyether, polysulfone, poly Yinimine, polyether oxime, polyarylate, polyetheretherketone, polyoxyxene, and the like. These may be used alone or in combination of two or more thereof. The polymer resin may be included in an amount of from 1 to 25 wt.%, preferably from 5 to 25 wt.%, relative to a total of 100 wt.% of the organic transport means. If the amount is less than 1 wt.%, the printing characteristics and dispersibility of the slip composition may be lowered. On the other hand, when the amount exceeds 25 wt.%, the slip composition may become useless for printing. In addition to the foregoing materials, the organic delivery means may further comprise a dispersant as an additive. The dispersing agent can be any surfactant known in the related art, and includes, for example, ethers such as polyoxyethylene alkyl ethers having an alkyl group provided with 6 to 30 carbon atoms, provided with 6 to 30 a polyoxyethylene alkyl aryl ether of an alkyl group having one carbon atom, a polyoxyethylene-polyoxypropylene alkyl ether having an alkyl group having 6 to 30 carbon atoms, and the like; an ester-ether such as a glyceride Addition of polyoxyethylene oxime, sorbitan ester-added polyoxyethylene ether, sorbitan ester-added polyoxyethylene ether, etc.; esters such as polyethylene glycol fatty acid esters, glycerides, sorbitol esters a propylene glycol ester, a sugar ester, a polyalkyl glucoside or the like; a nitrogen-containing compound such as a fatty acid alkanolamine, a polyoxyethylene fatty acid decylamine, a 1001467# single number having an alkyl group having 6 to 30 carbon atoms Α〇101 Page 12 of 23 1013078948-0 201230064

A polyoxyethylene alkylamine, an amine oxide or the like; and/or a polymer compound such as polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid polyacrylic acid-maleic acid copolymer, poly 12 hydroxystearic acid or the like. In addition, hypermer KD (Uniquema), ΑΚΜ 0531 (Nippon Oil and Fat Co. Ltd.) 'KP (Shinetsu Chemical Co. Ltd.), POLYFLOW (Kyoei Chemical Co.) can also be used in commercially available products. Ltd.) ' EFTOP (Tochera Products Co.) > Asahi guard (Asahi Glass Co. Ltd.) ' Surf Ion (Asahi Glass Co. Ltd.) ' SOLSPERSE (Geneka Inc.) > EFKA (EFKA Chemicals) ' PB 821 (Azinomoto Co. Ltd.) >

BYK-184, BYK-185, BYK-2160, Anti-Terra U (BYK

Co.), and so on. These can be used alone or in combination of two or more thereof. The dispersant may be included in an amount of from 1 to wt.%, preferably from 1 to 5 wt.%, relative to a total of 100 wt.% of the organic transport means.

In addition to the dispersant, the organic transport tool can further include additives such as thixotropic agents, humectants, antioxidants, anti-corrosion agents, anti-foaming agents, bulking agents, dispersing agents, tackifiers, and consuming agents. , antistatic agents, polymerization inhibitors, anti-settling agents, and the like. The organic carrier can be included in the range of from 〇 to 34. wt% with respect to the powder composition of 〜/, 100 wt.%. If the amount is less than μ.%, the purity of the slurry composition becomes too high, which may reduce the flow secret, and may reduce the printing characteristics-" the aluminum powder content is relatively low, the problem. On the other hand, when the amount exceeds 34. wt.%, it leads to 10014678^A〇101 which is sufficient in obtaining the thickness of the slurry layer. Page 13/23 pages 1013078948-0 201230064 .jit. Aluminum paste containing the aforementioned ingredients The composition does not include the PbO component, and since the use of the PbO component is limited due to defects, the hydrophobic composition containing the above components is environmentally friendly. Further, since the composition does not contain β, a component having a heat-injecting property, the water repellency can be successfully prevented. The present invention provides an electrode which can be produced by using the above aluminum powder slurry composition. The electrode was produced by applying the aluminum slip composition to a substrate, that is, a Shihwa wafer substrate provided with an Ag front electrode, to perform printing, and then drying and sintering the printed substrate. This kind of printing method is not particularly limited, however. It may include screen printing, gravure printing or offset printing. #6〇 to 300C for a few seconds to a few minutes to read the dryness, while at 600 to 950 C for a few seconds to perform sintering. The electrode thus fabricated can be used as a rear electrode of the Feng Tailing battery device to improve the durability of the device, in addition to Τς Ν Ν + + '曰 曰 plus maximum output current (I%) ' while enhancing the efficiency of the solar cell device . The present invention provides a solar cell device provided with an electrode fabricated using the aluminum powder slurry composition. In the following, a preferred example of the TT^η r ^ poorly known example will be described with reference to the examples and comparative examples to more specifically understand the domain. Praise month. However, it will be apparent to those skilled in the art that the specific embodiments are provided for the purpose of illustration, and that various modifications and changes may be made without departing from the scope and spirit of the invention. And m μ φ ^ ^ ^ 5 kinds of modifications and changes are fully included in the present invention as in the scope of the patent application. Preparation Examples 1 to 9 'Preparation of Frit I to IX 1〇〇14678 Production No._1 Page 14 of 23 1013078948-0 201230064 Based on the ingredients listed in Table 1 below and their contents, have been prepared Glass frit.

R2〇二靥靥Oxide (K20, Na20, Li20) [Table 1] Partial type component (mol%) Tg CC) CTE (l〇-7/uC) ZnO Bi2〇3 Α12〇ϊ Β2〇3 PbO Ρ2〇 5 Si〇i Κ20 RO Preparation Example 1 I 48 - - 33 - 7 - 6 6 480 74 Preparation Example 2 11 44.1 - ' 39 - - 4.6 6.9 5.4 483 66 Preparation 3 111 60 • 40 498 72 Preparation Example 4 IV 50 - - 41 - - 9 - ' 512 64 Preparation Example 5 V - 15 15 24 46 • - 520 68 倔 . Example 6 VI 9 17 9 39 26 - - 505 70 Preparation Example 7 VII 53 30 4 13 454 84 Preparation Examples 8 VIII 30 - 62 - 2.1 3.1 2.8 532 62 Preparation Example 9 IX 81 - - Π - - 2λ 3. 2.8 425 98 R〇: Alkaline earth metal oxide (StO, BaO, CaO) τ, : mm CTE : Example of thermal expansion coefficient 1 Aluminum powder having an average particle size of 4 to 6 P and another aluminum powder having an average particle size of 2 to 4 P were mixed at a relative weight ratio of 90:10 to prepare a powder mixture. Then, 74 wt. % of the prepared powder mixture was mixed with 0.5 wt. % of the frit I prepared in Preparation Example 1, and 25. 5 wt. % of the ethylcellulose resin was dissolved in tripropylene glycol methyl ether. After the organic transport tool, the mixture was mixed using a mixer at 1, rpm while performing rotation and revolution for 3 minutes, resulting in an aluminum slip composition. 10014678^^^ A〇101 Page 15 of 23 1013078948-0 201230064 Example 2 Except for the use of the borrower / ..., the frit 11 in the target 2, the same procedure as that described in Example 1 is performed. . Example 3, using the same procedure as in Example 1, except that the frit in Preparation Example 3 was used. Example 4 shows the same procedure as described in Example m, except that the frit IV of the preparation example clock is used. Comparative Example i '7 Using the frit V in Preparation Example 5, the same procedure as described in Example 1 was performed. Comparative Example 2 Except for the use of the frit VI in the injury example 6, implementation and examples! Describe the same procedure. Comparative Example 3 The same procedure as that described in the example is carried out except that the frit VII of the preparation example is used. Comparative Example 4 Except for the use of frit VIII in Preparation Example 8, 'execution and examples! Describe the same procedure. Comparative Example 5 The same procedure as described in Example 1 was carried out except that the frit IX in Preparation Example 9 was used. Experimental Examples For the aluminum powder slurry composition prepared in the foregoing examples and comparative examples, a single layer A0101 page 16 / 23 pages 1013078948-0 201230064, physical properties were measured according to the following procedure, and the measurement results thereof were shown. In Table 2 below. (-) The aluminum powder slurry composition prepared as described above was applied to a rear surface of a single crystal germanium wafer substrate having a size of 156 mra X 156 mm, 200, via a screen printing plate having 250 meshes. The thickness of the coating is controlled at 1.4 ± 0.1 g. The thickness of the coating is controlled at 1.4 ± 0.1 g. After drying the applied slip at 200 ° C, it was sintered in an IR continuous sintering furnace at 720 to 900 ° C for about 10 seconds. Performing the sintering process by passing the tantalum wafer substrate through a belt furnace including a burning portion at 600 ° C and a sintered portion at 800 to 950 ° C to simultaneously perform sintering of the front and back of the substrate, thereby The organic material in the slip is burned while melting a portion of the aluminum, thereby fabricating an electrode, and finally a solar cell device having the electrode is fabricated. (1) Water repellency After the manufactured solar cell device was placed in a water bath containing distilled water at 80 ° C, the solar cell device was left for 10 minutes. Hydrogen bubbles (bubbles) generated by the reaction of the aluminum electrode prepared in the water bath with water were clearly observed, and then the hydrogen bubble 〇 was evaluated based on the following criteria [Evaluation Criteria] 〇: No bubbles were observed (excellent) X: Observed bubbles (poor) (2) - Curved (mm) Place the fabricated solar cell device on a flat surface and place it 410014678^^ AQ1Q1 Page 17 / 23 pages 1013078948-0 201230064 After the edge is aligned to be the same as the surface, the degree of delamination of the central portion of the device is measured. (3) Efficiency (%) The efficiency of the manufactured solar cell device was evaluated using an evaluation device SCM-100 (FitTech). [Table 2] Durability Bending (mm) Efficiency (%) Example 1 〇1,5±0.3 Π·7 Soil 0·2 Example 2 〇1.2±0.1 17,7±0.3 _3 〇1.7±0,4 17.6 into 4 Example 4 〇1 sword.3 17.5±0.4 Comparative example 1 X 1 alone, 4 17. Private 0.4 Comparative remuneration 2 X 1.4 Soil (K3 17.4±0.2 Comparative drive case 3 X 1.7±0.5 Π sword, 3 comparative Reward 4 〇2.3Λ4 17.2i0.3 Comparative Example 5 〇2.1 ± 0,4 17.U0.2 As shown in Table 2, it can be seen that the aluminum having the glass frit prepared in Examples 1 to 4 is used. Each of the solar cell devices manufactured by the slurry composition is environmentally friendly and can prevent reaction with moisture, wherein the glass frit does not contain Pb 〇 and Bi „0, but includes ZnO and yttrium as main components. Exhibition 2 3 ^ The solar cell device has excellent water repellency and improved durability. Furthermore, it has been confirmed that even if it has a relatively high coefficient of thermal expansion, bending is preferably suppressed, and the device is enhanced. Efficiency, in particular, in which the aluminum slip composition contains its optimum content of Si〇2, metal oxides and alkaline earth metal oxides. In the examples of ZnO and B2〇3, the water repellency is optimally ensured while minimizing (ie, greatly reducing) the occurrence of bending. On the other hand, due to the reaction with moisture, the use has in Comparative Examples 1 to 3 The solar cell leg amount of the aluminum powder slurry composition prepared in the glass frit is a single number button 01/18 pages/total 23 pages 1013078948-0 201230064

[0005] A device in which the glass frit contains B i 2〇3, exhibiting poor water repellency. In particular, the glass frit containing the PbO component prepared in Comparative Example 3 did not achieve environmentally friendly characteristics. Meanwhile, the products prepared in Comparative Examples 4 and 5 each contained a very small amount and an excess amount of ZnO, even though these products did not contain Bi2〇3, but exhibited considerable failure of the wafer substrate to be bent and lowered. Efficiency, although they can have improved water resistance. As is apparent from the foregoing, the aluminum slip composition of the present invention is environmentally friendly since it does not contain a PbO component which is limited in use due to environmental problems. At the same time, the inventive composition not including the Bi2〇3 component has high resistance to thermal etching, and thus can prevent reaction with moisture. Therefore, the present invention can improve the durability of the solar cell device itself. In addition, the aluminum slip composition of the present invention can suppress the bending of the tantalum wafer substrate even if it has a relatively high coefficient of thermal expansion, and in addition, the aluminum slip composition can increase the maximum output current (Isc) of the solar cell device, and The efficiency of the solar cell device is enhanced. While the invention has been described with respect to the preferred embodiments the embodiments of the invention BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and other advantages of the present invention will become more apparent from the detailed description of the appended < [Main component symbol description]

10014678^^^E A0101 Page 19 of 23 1013078948-0 201230064 [0006] : 矽 Wafer substrate: N + layer: anti-reflection film: front electrode: P + layer: rear electrode painting lion ^ single number hall 01 Page 20 of 23 1013078948-0

Claims (1)

201230064 VII. Patent application scope: 1. A composition of aluminum powder slurry, comprising: an aluminum powder containing 40 to 80 mole percent (mol%) of ZnO and 20 to 60 mol% of a glass frit, L·0 And an organic shipping tool. 2. The powdered powder composition of claim 1, wherein the glass frit further comprises at least one selected from the group consisting of si〇2, p2〇5, an alkali metal oxide, and an alkaline earth metal oxide. Group. 3. The composition of the syrup of claim 2, wherein the glass frit contains 2 to 15 mol/min of Si 〇 2, 2 to 15 with respect to 0. Mol 9 ^ P 2 〇 5, 2 to 10 mol% of the test metal oxide and 2 to 10 mol% of the soil test metal oxide _. 4. The composition of the syrup according to claim 3, wherein the glass frit comprises 40 to 60 mol% of ZnO, 20 to 60 mol% of B0, and 2 to 2 3 15 mol% of Si〇24P2. 〇 5, 2 to 10 mol% of the metal oxide and 2 to 10 mol% of the alkaline earth metal oxide. 5. The aluminum slip slurry composition according to claim 2, wherein the alkali gold Q-based oxide is at least one selected from the group consisting of niobium, Na2〇, and Li2〇, and the soil-measuring metal The oxide is at least one selected from the group consisting of Mg〇, ca〇, SrO, and BaO. 6. The aluminum slip slurry composition of claim 1, wherein the glass frit has a softening point of 300 to 600 °C. 7. The aluminum slip composition according to claim 1, comprising 65 to 75 weight percent of an aluminum powder, 0.01 to 1 inch wt.e/^ of the glass frit, and 20 to 34.9 wt.% of the Organic shipping tools. 8. The aluminum powder slurry composition according to claim 1, wherein the aluminum powder 10014678#·single number A0101 page 21/23 pages 1013078948-0 201230064 is a mixture comprising 60 to 95 wt % has a powder of -6 μτη - average particle size and 5 to 40 wt. % of another powder having an average particle size of 2 to 4 μηι. The aluminum slip slurry composition according to claim 1, wherein the organic transporting means is a mixture comprising 丨 to 25 wt% of a high molecular weight resin and 75 to 99 wt% of an organic solvent. Ίο. 11 . The electrode ' is manufactured using the powder composition according to any one of items i to 9 of the patent application. A solar i battery device 'has an electrode as described in the patent application section. 10014678^单号 A0101 Page 22 of 23 1013078948-0