CN105489265A - Ink-jet printing transparent nano silver conductive solution for conducting circuit and preparation method and construction method of ink-jet printing transparent nano silver conductive solution - Google Patents
Ink-jet printing transparent nano silver conductive solution for conducting circuit and preparation method and construction method of ink-jet printing transparent nano silver conductive solution Download PDFInfo
- Publication number
- CN105489265A CN105489265A CN201510874276.7A CN201510874276A CN105489265A CN 105489265 A CN105489265 A CN 105489265A CN 201510874276 A CN201510874276 A CN 201510874276A CN 105489265 A CN105489265 A CN 105489265A
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- solution
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- transparent nano
- ink
- printing transparent
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 238000007641 inkjet printing Methods 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 title claims abstract description 8
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims abstract description 19
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 150000001412 amines Chemical class 0.000 claims abstract description 19
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims abstract description 19
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims abstract description 19
- 239000003760 tallow Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 239000013078 crystal Substances 0.000 claims abstract description 8
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000008719 thickening Effects 0.000 claims abstract description 8
- 239000013008 thixotropic agent Substances 0.000 claims abstract description 8
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 230000008961 swelling Effects 0.000 claims abstract description 7
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 229910052709 silver Inorganic materials 0.000 claims description 26
- 239000004332 silver Substances 0.000 claims description 26
- 239000008367 deionised water Substances 0.000 claims description 24
- 229910021641 deionized water Inorganic materials 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000000047 product Substances 0.000 claims description 9
- 239000004480 active ingredient Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000007639 printing Methods 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000006479 redox reaction Methods 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000008098 formaldehyde solution Substances 0.000 abstract 1
- 229940071676 hydroxypropylcellulose Drugs 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022466—Electrodes made of transparent conductive layers, e.g. TCO, ITO layers
- H01L31/022491—Electrodes made of transparent conductive layers, e.g. TCO, ITO layers composed of a thin transparent metal layer, e.g. gold
Abstract
The invention relates to an ink-jet printing transparent nano silver conductive solution for a conducting circuit and a preparation method and a construction method of the ink-jet printing transparent nano silver conductive solution. The ink-jet printing transparent nano silver conductive solution is prepared from the following components in percentage by mass: a silver nitrate solution, a tallow fatty amine solution, a triethanolamine solution, a formaldehyde solution, a hydroxy propyl cellulose solution and an alkali swelling thickening thixotropic agent; the components are mixed and stirred in preparation to obtain the solution, namely the finished product; the solution of the finished product is arranged on an ink box of an ink-jet printer in a construction process; the used pattern design is input into a computer as a printed pattern; and the pattern is printed on the front surface of a crystal silicon solar cell, and is dried and sintered to form a conducting circuit of which the line width is 25 microns, so that the lighted area of the battery piece is increased; meanwhile, the short-circuit current is increased; and the conversion efficiency is improved.
Description
Technical field
The present invention is a kind of conductive nano silver solution machine preparation method and construction method of the positive silver-colored conducting wire for crystal silicon solar batteries.
Background technology
The electrode (i.e. conducting wire) in current crystal silicon solar batteries (comprising polysilicon and monocrystaline silicon solar cell) front adopts the silk-screen mode of silver slurry, be printed onto front and form a netted conductive circuit pattern interconnected, light induced electron on cell piece is collected, guiding external device.These conducting wires the light-receiving area on cell piece can be reduced, so industry is devoted to reduce the width of conducting wire always, namely reduce the consumption of silver, also can increase the light-receiving area in cell piece front, cost-saving increase energy output is exactly the target of the technological innovation of industry.
Accomplished that live width actual measured value has been the width of 50-55 μm at present, this is considered to the most precision lines of screen printing technique, then is contracted to 40-50 μm or less and has been considered to implement.
Summary of the invention
The present invention changes traditional silk-screened front silver Wiring technology in the past, make into InkJet printing processes, Nano silver solution is printed on the front of crystal silicon solar batteries, then forms conducting wire through oversintering, the conducting wire of obtained meticulousr (most I reach 25 μm of live widths); The light-receiving area of cell piece is increased, increases short circuit current simultaneously, improve conversion efficiency.
The technical solution adopted for the present invention to solve the technical problems is:
For an inkjet printing transparent nano conductive silver solution for conducting wire, it is characterized in that, comprise following component and mass percentage content is:
Liquor argenti nitratis ophthalmicus 20-60%;
Tallow amine solution 1-10%;
Triethanolamine solution 0.5-6%;
Formalin 10-40%;
Hydroxypropyl cellulose solution 1-10%;
Alkali swelling class thickening thixotropic agent 0.1-3%.
Another object of the present invention is to provide a kind of method of the inkjet printing transparent nano conductive silver solution for the preparation of conducting wire, it is characterized in that, comprise the steps: first to stir the liquor argenti nitratis ophthalmicus paddle agitator of constant temperature at 5 DEG C, mixing speed is 30 turns/min, under stirring, add tallow amine, add triethanolamine solution again as dilution, the pH value of whole solution is made to reach till 7.8, add formalin again, carry out the redox reaction to silver, make the transparent shape of solution; Finally, add hydroxypropyl cellulose solution and stir, mixing speed is 800 turns/min, then joins in solution by swelling for alkali class thickening thixotropic agent, and now solution is finished product.
The preparation method of described liquor argenti nitratis ophthalmicus is: adopt silver nitrate with 10% ratio mix with the mass parts ratio of the ionized water 90% that anhydrates after, under being placed on the container of constant temperature 5 DEG C or the solution temperature of refrigeration maintenance 5 DEG C, dasher speed of agitator is used to be 30 turns/min, obtained liquor argenti nitratis ophthalmicus.
The preparation method of described tallow amine solution is: the single product adopting tallow amine 100% active ingredient, by 80 DEG C of heating deionized water, by deionized water and the tallow amine after heating in after the ratio mixed dissolution of 1:1, obtain tallow amine solution, preserve in 5 DEG C of incubators.
The preparation method of described triethanolamine solution is: the single product adopting triethanolamine 99% active ingredient, and the triethanolamine of taking 40% mass parts mixes with 60% deionized water, after the incubator being placed in 5 DEG C deposits 2 hours, obtains triethanolamine solution.
The preparation method of described formalin is: by mass percentage 80% formaldehyde with 20% deionized water mix after, obtained formalin, preserves under being placed in 5 DEG C of low temperature.
The preparation method of described hydroxypropyl cellulose solution is: get the hydroxypropyl cellulose of 10% and the deionized water of 90%, deionized water is put into container, stir in pan mixer, mixing speed is 200 turns/min, adds hydroxypropyl cellulose, is heated to 50 DEG C after adding, dissolve the quantity that completely, weighing deionized water volatilizees because of heating, supplement deionized water again to original quantitative proportion, obtain hydroxypropyl cellulose solution, then take out and be cooled to 5 DEG C of preservations.
Another object of the present invention is to provide a kind of construction method of the inkjet printing transparent nano conductive silver solution for conducting wire, it is characterized in that, first the conductive silver solution of above-mentioned preparation is placed on the print cartridge of ink-jet printer, the design used is inputted computer as the pattern printed, design live width is 25 μm, 120 thin grid lines, the main gate line of three live widths 500 μm, by this pattern spray printing in the front of crystal silicon solar batteries, after drying sintering, namely form conducting wire.
The invention has the beneficial effects as follows:
The present invention changes traditional silk-screened front silver Wiring technology in the past, make into InkJet printing processes, Nano silver solution is printed on the front of crystal silicon solar batteries, then forms conducting wire through oversintering, the conducting wire of obtained meticulousr (most I reach 25 μm of live widths).The light-receiving area of cell piece is increased, increases short circuit current simultaneously, improve conversion efficiency.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
For an inkjet printing transparent nano conductive silver solution for conducting wire, comprise following component and mass percentage content is:
Liquor argenti nitratis ophthalmicus 45%;
Tallow amine solution 2%;
Triethanolamine solution 1%;
Formalin 40%;
Hydroxypropyl cellulose solution 10%;
Alkali swelling class thickening thixotropic agent 2%.
Another object of the present invention is to provide a kind of method of the inkjet printing transparent nano conductive silver solution for the preparation of conducting wire, comprise the steps: first to stir the liquor argenti nitratis ophthalmicus paddle agitator of constant temperature at 5 DEG C, mixing speed is 30 turns/min, under stirring, add tallow amine, add triethanolamine solution again as dilution, the pH value of whole solution is made to reach till 7.8, slowly be added dropwise to formalin again, carry out the redox reaction to silver, generate cloudy particle, make the transparent shape of solution (because the silver particles restored under low temperature and dispersant protection is nano transparent solution, formation nanoscale is only had to be only the transparent body), finally, add hydroxypropyl cellulose solution to stir, mixing speed is 800 turns/min, again swelling for alkali class thickening thixotropic agent is joined in solution, pH value because of overall solution is weakly alkaline 7.8 numerical value, solution will be made to become thickness after adding this type of thickening thixotropic agent but the strong solution finished product of thixotropy, interior argentiferous is 30%-60%, is applicable to ink-jet printer printed with fine circuit.
The preparation method of described liquor argenti nitratis ophthalmicus is: adopt silver nitrate with 10% ratio mix with the mass parts ratio of the ionized water 90% that anhydrates after, under being placed on the container of constant temperature 5 DEG C or the solution temperature of refrigeration maintenance 5 DEG C, dasher speed of agitator is used to be 30 turns/min, obtained liquor argenti nitratis ophthalmicus.
The preparation method of described tallow amine solution is: the single product adopting tallow amine 100% active ingredient, by 80 DEG C of heating deionized water, by deionized water and the tallow amine after heating in after the ratio mixed dissolution of 1:1, obtain tallow amine solution, preserve in 5 DEG C of incubators.
The preparation method of described triethanolamine solution is: the single product adopting triethanolamine 99% active ingredient, and the triethanolamine of taking 40% mass parts mixes with 60% deionized water, after the incubator being placed in 5 DEG C deposits 2 hours, obtains triethanolamine solution.
The preparation method of described formalin is: by mass percentage 80% formaldehyde with 20% deionized water mix after, obtained formalin, preserves under being placed in 5 DEG C of low temperature.
The preparation method of described hydroxypropyl cellulose solution is: get the hydroxypropyl cellulose of 10% and the deionized water of 90%, deionized water is put into container, stir in pan mixer, mixing speed is 200 turns/min, adds hydroxypropyl cellulose, is heated to 50 DEG C after adding, dissolve the quantity that completely, weighing deionized water volatilizees because of heating, supplement deionized water again to original quantitative proportion, obtain hydroxypropyl cellulose solution, then take out and be cooled to 5 DEG C of preservations.
Another object of the present invention is to provide a kind of construction method of the inkjet printing transparent nano conductive silver solution for conducting wire, it is characterized in that, first the conductive silver solution of above-mentioned preparation is placed on the print cartridge of ink-jet printer, the design used is inputted computer as the pattern printed, design live width is 25 μm, 120 thin grid lines, the main gate line of three live widths 500 μm, by this pattern spray printing in the front of crystal silicon solar batteries, after drying sintering, namely form conducting wire.
Preparing the conductive nano silver solution that can adapt to ink-jet printer printing is key technology of the present invention, select the printing technique equipment and process of existing maturation, be used for solar cell inkjet printing conducting wire by the printer printed for microlite pottery and equipment.Use the method the most critically can produce the conductive silver wire of 25 μm wide, increase light-receiving area, increase short circuit current, thus improve conversion efficiency.
Above-described specific embodiment, is only preferred embodiment of the present invention, such as according to the equivalent arrangements that patent application the scope of the claims does, all should be technology of the present invention and contained.
Claims (8)
1. for an inkjet printing transparent nano conductive silver solution for conducting wire, it is characterized in that, comprise following component and mass percentage content is:
Liquor argenti nitratis ophthalmicus 20-60%;
Tallow amine solution 1-10%;
Triethanolamine solution 0.5-6%;
Formalin 10-40%;
Hydroxypropyl cellulose solution 1-10%;
Alkali swelling class thickening thixotropic agent 0.1-3%.
2. the method for the preparation of the inkjet printing transparent nano conductive silver solution of conducting wire, it is characterized in that, comprise the steps: first to stir the liquor argenti nitratis ophthalmicus paddle agitator of constant temperature at 5 DEG C, mixing speed is 30 turns/min, under stirring, add tallow amine, add triethanolamine solution again as dilution, the pH value of whole solution is reached till 7.8, then adds formalin, carry out the redox reaction to silver, make the transparent shape of solution; Finally, add hydroxypropyl cellulose solution and stir, mixing speed is 800 turns/min, then joins in solution by swelling for alkali class thickening thixotropic agent, and now solution is finished product.
3. according to claim 2 for the preparation of the method for the inkjet printing transparent nano conductive silver solution of conducting wire, it is characterized in that, the preparation method of described liquor argenti nitratis ophthalmicus is: adopt silver nitrate with 10% ratio mix with the mass parts ratio of the ionized water 90% that anhydrates after, under being placed on the container of constant temperature 5 DEG C or the solution temperature of refrigeration maintenance 5 DEG C, dasher speed of agitator is used to be 30 turns/min, obtained liquor argenti nitratis ophthalmicus.
4. according to claim 2 for the preparation of the method for the inkjet printing transparent nano conductive silver solution of conducting wire, it is characterized in that, the preparation method of described tallow amine solution is: the single product adopting tallow amine 100% active ingredient, by 80 DEG C of heating deionized water, by heating after deionized water and tallow amine in after the ratio mixed dissolution of 1:1, obtained tallow amine solution, preserves in 5 DEG C of incubators.
5. according to claim 2 for the preparation of the method for the inkjet printing transparent nano conductive silver solution of conducting wire, it is characterized in that, the preparation method of described triethanolamine solution is: the single product adopting triethanolamine 99% active ingredient, the triethanolamine of taking 40% mass parts mixes with 60% deionized water, after the incubator being placed in 5 DEG C deposits 2 hours, obtained triethanolamine solution.
6. according to claim 2 for the preparation of the method for the inkjet printing transparent nano conductive silver solution of conducting wire, it is characterized in that, the preparation method of described formalin is: by mass percentage 80% formaldehyde with 20% deionized water mix after, obtained formalin, preserves under being placed in 5 DEG C of low temperature.
7. according to claim 2 for the preparation of the method for the inkjet printing transparent nano conductive silver solution of conducting wire, it is characterized in that, the preparation method of described hydroxypropyl cellulose solution is: get the hydroxypropyl cellulose of 10% and the deionized water of 90%, deionized water is put into container, stir in pan mixer, mixing speed is 200 turns/min, add hydroxypropyl cellulose, 50 DEG C are heated to after adding, dissolve the quantity that completely, weighing deionized water volatilizees because of heating, supplement deionized water again to original quantitative proportion, obtain hydroxypropyl cellulose solution, then take out and be cooled to 5 DEG C of preservations.
8. the construction method for the inkjet printing transparent nano conductive silver solution of conducting wire, it is characterized in that, first the conductive silver solution of above-mentioned preparation is placed on the print cartridge of ink-jet printer, the design used is inputted computer as the pattern printed, design live width is 25 μm, 120 thin grid lines, the main gate line of three live widths 500 μm, by this pattern spray printing in the front of crystal silicon solar batteries, after drying sintering, namely form conducting wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510874276.7A CN105489265B (en) | 2015-12-03 | 2015-12-03 | Ink-jet printing transparent nano silver conductive solution for conducting circuit and preparation method and construction method of ink-jet printing transparent nano silver conductive solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510874276.7A CN105489265B (en) | 2015-12-03 | 2015-12-03 | Ink-jet printing transparent nano silver conductive solution for conducting circuit and preparation method and construction method of ink-jet printing transparent nano silver conductive solution |
Publications (2)
| Publication Number | Publication Date |
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| CN105489265A true CN105489265A (en) | 2016-04-13 |
| CN105489265B CN105489265B (en) | 2017-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510874276.7A Active CN105489265B (en) | 2015-12-03 | 2015-12-03 | Ink-jet printing transparent nano silver conductive solution for conducting circuit and preparation method and construction method of ink-jet printing transparent nano silver conductive solution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108492913A (en) * | 2018-05-16 | 2018-09-04 | 清远市宝晶新材料有限公司 | A kind of crystal silicon solar batteries front side silver paste and preparation method thereof being sintered after laser cutting |
| CN109713068A (en) * | 2018-12-26 | 2019-05-03 | 江苏日托光伏科技股份有限公司 | A kind of two-sided solar double-glass assemblies of back contact solar cell and its manufacturing method |
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| CN1723510A (en) * | 2003-12-17 | 2006-01-18 | 株式会社爱发科 | Method for forming transparent conductive film and transparent electrode |
| CN101085887A (en) * | 2006-06-08 | 2007-12-12 | 三星电机株式会社 | Metal ink composition for inkjet printing |
| CN101473386A (en) * | 2006-06-22 | 2009-07-01 | 三菱制纸株式会社 | Method for producing conductive material |
| US20090226753A1 (en) * | 2008-03-10 | 2009-09-10 | Fujifilm Corporation | Metal nanowires, method for producing the same, and aqueous dispersion thereof |
| CN103619128A (en) * | 2013-11-25 | 2014-03-05 | 深圳大学 | Preparing method of flexible circuit board based on ink-jet printing technique |
-
2015
- 2015-12-03 CN CN201510874276.7A patent/CN105489265B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1723510A (en) * | 2003-12-17 | 2006-01-18 | 株式会社爱发科 | Method for forming transparent conductive film and transparent electrode |
| CN101085887A (en) * | 2006-06-08 | 2007-12-12 | 三星电机株式会社 | Metal ink composition for inkjet printing |
| CN101473386A (en) * | 2006-06-22 | 2009-07-01 | 三菱制纸株式会社 | Method for producing conductive material |
| US20090226753A1 (en) * | 2008-03-10 | 2009-09-10 | Fujifilm Corporation | Metal nanowires, method for producing the same, and aqueous dispersion thereof |
| CN103619128A (en) * | 2013-11-25 | 2014-03-05 | 深圳大学 | Preparing method of flexible circuit board based on ink-jet printing technique |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108492913A (en) * | 2018-05-16 | 2018-09-04 | 清远市宝晶新材料有限公司 | A kind of crystal silicon solar batteries front side silver paste and preparation method thereof being sintered after laser cutting |
| CN109713068A (en) * | 2018-12-26 | 2019-05-03 | 江苏日托光伏科技股份有限公司 | A kind of two-sided solar double-glass assemblies of back contact solar cell and its manufacturing method |
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| Publication number | Publication date |
|---|---|
| CN105489265B (en) | 2017-03-22 |
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Effective date of registration: 20180614 Address after: 513499 Qingyuan City, Guangdong province Lianzhou city Qingyuan South National Industrial Park (land number):06380100017) Patentee after: Qingyuan Bajing New Material Co., Ltd. Address before: 528308 Shunde District, Foshan City, Guangdong Province, Xintang world long industrial zone Shilong Avenue (Shilin gloves Co., Ltd., the first floor of the workshop) Patentee before: FOSHAN SOLAR MATERIAL & EQUIPMENT CO., LTD. |