CN103065701A - Aluminum paste for silicon solar cell - Google Patents
Aluminum paste for silicon solar cell Download PDFInfo
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- CN103065701A CN103065701A CN2012104981676A CN201210498167A CN103065701A CN 103065701 A CN103065701 A CN 103065701A CN 2012104981676 A CN2012104981676 A CN 2012104981676A CN 201210498167 A CN201210498167 A CN 201210498167A CN 103065701 A CN103065701 A CN 103065701A
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- antioxidant
- solar cell
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Abstract
Provided is an aluminum paste for a silicon solar cell. The aluminum paste comprises, by composition and weight, 50 to 75 parts of aluminum powder, 20 to 45 parts of organic binder, 0.5 to 5 parts of inorganic binder, 0.1 to 5 parts of additive and 0.2 to 10 parts of antioxidants. The antioxidants are composition of inorganic antioxidants and organic antioxidants, and the weight ratio of the inorganic antioxidants and the organic antioxidants is 1:0.5 to 5.0. A product manufactured by the aluminum paste for the silicon solar cell is good in sintering adaptability, and a formed aluminum electrode is smooth in surface, and has no problems of aluminum blisters and ash generating. The aluminum paste for the silicon solar cell is particularly suitable for P-type silicon solar cell materials, a formed back surface field is deep and even, a manufactured cell piece is small in bending degree, a fragment rate is low, and photoelectric conversion efficiency is high.
Description
Technical field
The present invention relates to new energy field, particularly a kind of silicon solar cell aluminium paste.
Background technology
Great variety had occured in human energy resource structure in recent years, and the characteristics such as solar cell is little because of its use procedure pollution, easy care are used widely, and day by day become the emphasis of World Focusing.Business-like silicon solar cell all adopts silk screen printing at the metal-powder filling paste of silicon chip front and rear surfaces covering definite shape basically, forms electrode and back of the body electric field by co-sintering technique.Used metal-powder filling paste, general positive electrode adopts the silver slurry, and back electrode adopts silver-colored aluminium paste or silver slurry, and back of the body electric field and back of the body aluminium electrode adopt aluminium paste.
The aluminium paste that conventional solar cell uses, generally formed by aluminium powder, inorganic binder (glass dust), organic binder bond, additive, through silk screen printing (coating weight 5.0 ~ 7.0mg/cm2), form the aluminium film of about 30 micron thickness after dry on silicon chip, through the chain-type sintering furnace sintering, can form continuous aluminum sinter layer (aluminum back electrode).Because aluminium powder when heating oxidation can occur, aluminium powder surface alumina oxide film significantly thickens, and causes aluminium powder sintering character variation, is difficult to form good conduction and connects, and the aluminium back surface field degree of depth is 4-6 micron and inhomogeneous only, and battery efficiency is low.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the problems referred to above that prior art exists, and a kind of silicon solar cell aluminium paste is provided.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of silicon solar cell aluminium paste, the component that described aluminium paste contains and weight portion thereof are:
Aluminium powder 50～75,
Organic binder bond 20～45,
Inorganic binder 0.5～5,
Additive 0.1～5,
Antioxidant 0.2～10,
Described antioxidant is the composition of inorganic antioxidant and organic antioxidant, and the weight ratio of described inorganic antioxidant and organic antioxidant is 1:0.5～5.0.
Above-mentioned silicon solar cell aluminium paste, described antioxidant are 0.4～6 weight portion.
Above-mentioned silicon solar cell aluminium paste, described inorganic antioxidant is selected from one or more in silica flour, boron powder, selenium powder, antimony powder, bismuth meal, indium powder, the silicon aluminium alloy powder.
Above-mentioned silicon solar cell aluminium paste, described organic antioxidant are that the thermal oxidation decomposition temperature is 280～550 ℃ organic substance.
Above-mentioned silicon solar cell aluminium paste, described organic antioxidant is selected from C
4～C
25Alkane or paraffins mixture, C
4～C
25Aliphatic acid or one or more in the soap, phenol derivatives.
Above-mentioned silicon solar cell aluminium paste, described organic antioxidant is selected from C
5～C
9In Petropols, atoleine, vaseline, 200#～310# solvent naphtha, oleic acid, stearic acid, castor oil acid, hydrogenated castor oleic acid, oleate, stearate, ricinate, hydrogenated castor oleate, phenol derivatives, hydroquinones and the derivative thereof one or more.
Above-mentioned silicon solar cell aluminium paste, described aluminium powder is comprised of the aluminium powder of the aluminium powder of 0.1 ~ 1 micron of average grain diameter, 5 ~ 50 % by weight and 1～10 micron of average grain diameter, 50 ~ 95 % by weight.
Above-mentioned silicon solar cell aluminium paste, described aluminium powder is comprised of the aluminium powder of the aluminium powder of 0.1 ~ 1 micron of average grain diameter, 5 ~ 50 % by weight and 1～5 micron of average grain diameter, 50 ~ 95 % by weight.
Compared with prior art, the present invention has following advantage:
1. the present invention has reduced the degree of oxidation of aluminium powder under sintering range by being used in combination of inorganic antioxidant and organic antioxidant; And by adjusting the consumption proportion between organic antioxidant and the inorganic antioxidant, so that the aluminium powder in the aluminium paste can form with the silicon chip of solar cell the silicon-aluminum layer of even thickness, form the back of the body surface field of dark and thickness homogeneous, improved the conversion efficiency of solar cell.
2. the aluminium powder of the aluminium powder by adopting 0.1 ~ 1 micron of average grain diameter, 5 ~ 50 % by weight and 1～10 micron of average grain diameter, 50 ~ 95 % by weight is used in combination, further effectively controlled the degree of oxidation of aluminium powder in the sintering process, Effective Raise the adaptation of aluminium film and silicon chip, simultaneously, make aluminium paste can be under lower coating weight (4.0～4.9mg/cm
2), the aluminium film is done in thick 20～29 microns situation, still can guarantee long-wave response and the open circuit voltage of cell piece, obtains higher photoelectric conversion efficiency, and can effectively reduce the flexibility of cell piece.
Embodiment
The sintering process of solar cell is divided into presintering and two stages of high temperature sintering, the presintering phase temperature is about 300～550 ℃, in this stage, organic substance generation thermal oxidation in the aluminium paste is decomposed, organic binder bond normal operation ethyl cellulose resin or acrylic resin in the aluminium paste, decomposition temperature is lower, and it was completely decomposed of volatile in the sintering incipient stage, has lost the protective effect to aluminium powder; The high temperature sintering stage is about 550～850 ℃, the fusing point of aluminium is 660 ℃, in the high temperature sintering stage, aluminium powder generation melting also reacts with silicon substrate, generate silicon-aluminum, after cooling procedure in silicon-aluminum generation segregation, form the silicon layer be doped with the aluminium atom-back of the body surface field (BSF layer).In presintering and high temperature sintering stage, aluminium powder all may with atmosphere in the oxygen effect form aluminium oxide, hinder the generation of aluminium powder melting and silicon-aluminum, and then the formation of impact back of the body surface field.Therefore, need to take certain measure to come the over oxidation of reduce with control aluminium powder, wherein, adding antioxidant is a kind of effective method.
Among the present invention, use the composition of inorganic antioxidant and organic antioxidant to be used as preventing in the aluminium paste sintering process antioxidant that the aluminium powder over oxidation is used, wherein organic antioxidant can prevent effectively that sintering temperature from being the oxidation of 550 ℃ and the aluminium powder when following, the oxidation of the aluminium powder when inorganic antioxidant can prevent effectively that sintering temperature from being 550～660 ℃, the present invention controls the degree of oxidation of aluminium powder in the whole sintering process by adjusting the addition of antioxidant.Simultaneously, the present invention is by adjusting the consumption proportion of organic antioxidant and inorganic antioxidant, so that the aluminium powder in the aluminium paste can form with the silicon chip of solar cell continuous silicon-aluminum layer, the back of the body surface field degree of depth can reach 6～10 microns and thickness homogeneous.
Inorganic antioxidant among the present invention can be selected from one or more in silica flour, boron powder, selenium powder, antimony powder, bismuth meal, indium powder, the silicon aluminium alloy powder.
Being fit to organic antioxidant of the present invention is that the oxidation Decomposition temperature is 280～550 ℃ organic substance, preferred C
4～C
25Alkane or paraffins mixture, C
4～C
25Aliphatic acid or one or more in the soap, phenol derivatives, most preferably C
5～C
9In Petropols, phenol derivatives, hydroquinone derivative, atoleine, vaseline, 200#～310# solvent naphtha, oleic acid, stearic acid, castor oil acid, hydrogenated castor oleic acid, oleate, stearate, ricinate, the hydrogenated castor oleate one or more.
Among the present invention, the addition of antioxidant is controlled at 0.2～10 weight portion, and preferred 0.4～6 weight portion if be lower than 0.2 weight portion, can not obtain desirable oxidation-protective effect; If be higher than 10 weight portions, then can affect the sintering characteristic of aluminium paste, the apparent problems such as foaming, jaundice appear.
Among the present invention, the part by weight of inorganic antioxidant and organic antioxidant is controlled at 1:0.5～5.0, in order to can guarantee in whole sintering process, to obtain desirable aluminium powder oxidation degree, so that the aluminium powder in the aluminium paste can form with the silicon chip of solar cell uniform silicon-aluminum layer, form the back of the body surface field of dark and thickness homogeneous, improve the conversion efficiency of solar cell.
Be fit to aluminium powder of the present invention and can select the aluminium powder that uses in the known aluminium paste, being used in combination of the aluminium powder of the aluminium powder of preferred 0.1 ~ 1 micron of average grain diameter of employing, 5 ~ 50 % by weight and 1～10 micron of average grain diameter, 50 ~ 95 % by weight, in order to further effectively control the degree of oxidation of aluminium powder in the sintering process, increase the adaptation of aluminium film and silicon chip, and then the homogeneity of raising silicon-aluminum layer and aluminium back surface field, improve silicon solar cell open circuit voltage and efficient; And make aluminium paste can be under lower coating weight (4.0～4.9mg/cm
2), the aluminium film does in thick 20～29 microns situation, still can guarantee long-wave response and the open circuit voltage of cell piece, obtain higher photoelectric conversion efficiency, and can effectively reduce the flexibility of cell piece.If the usage ratio of the aluminium powder that average grain diameter is 0.1～1 micron is higher than 50%, then the degree of oxidation of aluminium powder is uncontrollable; If the usage ratio of the aluminium powder that average grain diameter is 0.1～1 micron is lower than 5%, then the adaptation of aluminium film and silicon chip can variation.
Inorganic binder among the present invention can be selected the Bi-B-Si glass frit that uses in the known aluminium paste, Bi-Al-B-Si glass frit, Bi-Zn-B-Si glass frit etc.
Organic binder bond among the present invention can adopt known aluminium paste macromolecule resin, mixes composition such as ethyl cellulose, acetylbutyrylcellulose, acrylic resin, epoxy phenolics, polyvinyl alcohol etc. with suitable this resinoid organic solvent of dissolving.
Additive among the present invention can adopt one or more in aluminum contained compound, titanium-containing compound, zirconium-containing compound, zinc compound, silicon-containing compound, the magnesium-containing compound, such as commercially available silicon dioxide, zinc oxide, zirconia, gamma-alumina, silane coupler, Aluminate etc.
The below describes embodiments of the invention.
Among the present invention, the organic binder bond among each embodiment can adopt the organic binder bond of following method preparation:
Ethyl cellulose 5% by weight percentage, diethylene glycol butyl ether 15%, diethylene glycol ether 10%, ethyl carbitol ester 70%, dissolving becomes clear solution through agitating heating, and cooling obtains organic binder bond.
The silicon solar cell preparation of aluminium paste:
With above-mentioned organic binder bond, mix according to ratio shown in the table 1 with aluminium powder, inorganic binder, antioxidant, additive, be ground to fineness less than 20 μ m with grinder, adjusting viscosity with solvent is 20 ~ 30pa.s, obtains the silicon solar cell aluminium paste.
With aluminium paste obtained above with 280 order silk screen printings in 180 ± 10 microns of 156mm * 156mm(thickness) on the polysilicon chip, its electrical performance data of test is listed in table 2 behind drying, the sintering.
The correlated performance method of testing is as follows in the table 2:
Flexibility: measure with vernier caliper.
Aluminum back electrode surface state: range estimation;
Cell piece section silicon-aluminum layer, the back of the body surface field degree of depth and thickness homogeneity: pass through scanning electron microscope observation.
Table 1
Table 2 performance test data
●: expression silicon-aluminum layer or back of the body surface field even thickness;
● zero: expression silicon-aluminum layer or back of the body surface field can cover silicon chip surface;
● *: expression silicon-aluminum layer or back of the body surface field can not all cover silicon chip.
Claims (7)
1. a silicon solar cell aluminium paste is characterized in that, the component that described aluminium paste contains and weight portion thereof are:
Aluminium powder 50～75,
Organic binder bond 20～45,
Inorganic binder 0.5～5,
Additive 0.1～5,
Antioxidant 0.2～10,
Described antioxidant is the composition of inorganic antioxidant and organic antioxidant, and the weight ratio of described inorganic antioxidant and organic antioxidant is 1:0.5～5.0.
2. silicon solar cell aluminium paste according to claim 1 is characterized in that, described antioxidant is 0.4～6 weight portion.
3. aluminum paste of silicon solar cells according to claim 2 is characterized in that, described inorganic antioxidant is selected from one or more in silica flour, boron powder, selenium powder, antimony powder, bismuth meal, indium powder, the silicon aluminium alloy powder.
4. silicon solar cell aluminium paste according to claim 3 is characterized in that, described organic antioxidant is that the thermal oxidation decomposition temperature is 280～550 ℃ organic substance.
5. silicon solar cell aluminium paste according to claim 4 is characterized in that, described organic antioxidant is selected from C
4～C
25Alkane or paraffins mixture, C
4～C
25Aliphatic acid or one or more in the soap, phenol derivatives.
6. silicon solar cell aluminium paste according to claim 5 is characterized in that, described organic antioxidant is selected from C
5～C
9In Petropols, atoleine, vaseline, 200#～310# solvent naphtha, oleic acid, stearic acid, castor oil acid, hydrogenated castor oleic acid, oleate, stearate, ricinate, hydrogenated castor oleate, phenol derivatives, hydroquinones and the derivative thereof one or more.
7. silicon solar cell aluminium paste according to claim 6 is characterized in that, described aluminium powder is comprised of the aluminium powder of the aluminium powder of 0.1 ~ 1 micron of average grain diameter, 5 ~ 50 % by weight and 1～10 micron of average grain diameter, 50 ~ 95 % by weight.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400635A (en) * | 2013-07-27 | 2013-11-20 | 乐凯胶片股份有限公司 | Aluminum paste for ultrathin silicon wafer solar battery |
| CN103617823A (en) * | 2013-11-29 | 2014-03-05 | 江苏瑞德新能源科技有限公司 | Low-warpage solar cell aluminum-back paste |
| CN104157330A (en) * | 2014-07-30 | 2014-11-19 | 泸溪县金源粉体材料有限责任公司 | Aluminium powder for aluminium slurry of crystalline silicon solar battery, preparation method thereof, and solar battery containing aluminium powder |
| CN104464882A (en) * | 2014-12-05 | 2015-03-25 | 清华大学 | Photovoltaic cell silver paste and sintering method thereof |
| CN104835552A (en) * | 2015-04-28 | 2015-08-12 | 华东理工大学 | Doped slurry used for N-type solar cell metallization |
| CN104952512A (en) * | 2014-03-28 | 2015-09-30 | 比亚迪股份有限公司 | Al-ABSF (aluminum back surface field) conductive slurry for crystalline silicon solar cell, and manufacturing method for Al-ABSF conductive slurry |
| CN107622812A (en) * | 2017-08-28 | 2018-01-23 | 广州市儒兴科技开发有限公司 | A kind of two-sided PERC crystal-silicon solar cells aluminium paste of p-type and preparation method thereof |
| WO2018040569A1 (en) * | 2016-08-30 | 2018-03-08 | 南通天盛新能源股份有限公司 | Aluminum paste with high filling rate for local contact back surface field of perc cell and preparation method and use thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400635A (en) * | 2013-07-27 | 2013-11-20 | 乐凯胶片股份有限公司 | Aluminum paste for ultrathin silicon wafer solar battery |
| CN103617823A (en) * | 2013-11-29 | 2014-03-05 | 江苏瑞德新能源科技有限公司 | Low-warpage solar cell aluminum-back paste |
| CN103617823B (en) * | 2013-11-29 | 2016-02-17 | 江苏瑞德新能源科技有限公司 | A kind of low warpage solar cell back aluminum slurry |
| CN104952512A (en) * | 2014-03-28 | 2015-09-30 | 比亚迪股份有限公司 | Al-ABSF (aluminum back surface field) conductive slurry for crystalline silicon solar cell, and manufacturing method for Al-ABSF conductive slurry |
| CN104952512B (en) * | 2014-03-28 | 2017-08-25 | 比亚迪股份有限公司 | A kind of crystal silicon solar energy battery Al-BSF electrocondution slurry and preparation method thereof |
| CN104157330A (en) * | 2014-07-30 | 2014-11-19 | 泸溪县金源粉体材料有限责任公司 | Aluminium powder for aluminium slurry of crystalline silicon solar battery, preparation method thereof, and solar battery containing aluminium powder |
| CN104464882A (en) * | 2014-12-05 | 2015-03-25 | 清华大学 | Photovoltaic cell silver paste and sintering method thereof |
| CN104464882B (en) * | 2014-12-05 | 2016-08-17 | 清华大学 | A kind of photovoltaic cell silver slurry and sintering method thereof |
| CN104835552A (en) * | 2015-04-28 | 2015-08-12 | 华东理工大学 | Doped slurry used for N-type solar cell metallization |
| WO2018040569A1 (en) * | 2016-08-30 | 2018-03-08 | 南通天盛新能源股份有限公司 | Aluminum paste with high filling rate for local contact back surface field of perc cell and preparation method and use thereof |
| US10373726B2 (en) | 2016-08-30 | 2019-08-06 | Nantong T-Sun New Energy Co., Ltd. | Highly filled back surface field aluminum paste for point contacts in PERC cells and preparation method thereof |
| CN107622812A (en) * | 2017-08-28 | 2018-01-23 | 广州市儒兴科技开发有限公司 | A kind of two-sided PERC crystal-silicon solar cells aluminium paste of p-type and preparation method thereof |
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Application publication date: 20130424 |