CN103029423A - Solar cell wafer and printing screen thereof - Google Patents
Solar cell wafer and printing screen thereof Download PDFInfo
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- CN103029423A CN103029423A CN201210575675XA CN201210575675A CN103029423A CN 103029423 A CN103029423 A CN 103029423A CN 201210575675X A CN201210575675X A CN 201210575675XA CN 201210575675 A CN201210575675 A CN 201210575675A CN 103029423 A CN103029423 A CN 103029423A
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Abstract
The invention discloses a solar cell wafer and a printing screen thereof. The number of the meshes of the two edge engraved areas of the printing screen parallel with the printing direction is less than the number of the meshes of the other engraved area. By changing the parameter of part of the edge engraved areas of the printing screen, the thickness of aluminium paste printed on the whole silicon wafer is enabled to be uniform, the surface of the edge area with thin aluminium is prevented from becoming rough or producing aluminium balls due to temperature fluctuation when sintering temperature is high, the sintering temperature regulation range is broadened, consequently, the surface electric contact capability between the front electrode, the back electrode and the back electric field of the solar cell wafer can be enhanced by increasing the sintering temperature, and thereby the conversion efficiency of a solar cell can be increased ultimately.
Description
Technical field
The present invention relates to technical field of solar batteries, more particularly, relate to a kind of solar battery sheet and printing screen thereof.
Background technology
In recent years, the solar battery sheet production technology is constantly progressive, and production cost constantly reduces, and conversion efficiency improves constantly, and the application of photovoltaic generation is popularized and fast development day by day, becomes gradually the important sources of supply of electric power.Solar battery sheet is the photoelectric cell of a kind of ability conversion, and it can be transform light energy electric energy under the irradiation of sunshine, realizes photovoltaic generation.
As the new forms of energy of clean environment firendly, the application of solar cell is more and more universal, but the production technology more complicated of solar battery sheet, and the production process of present solar battery sheet can be divided into following key step:
1) removal of damage layer and matte prepare, and remove the cutting damage layer of silicon chip surface by chemical reaction, obtain simultaneously rational rough surface, to strengthen Optical Absorption;
2) PN junction is made in diffusion, the silicon chip of P type is put into diffusion furnace, by the space between the silicon atom make the N-type foreign atom by the silicon chip surface layer to the silicon chip diffusion inside, form PN junction, make electronics and hole after flowing, not return the original place, so just, form electric current, also just make silicon chip have photovoltaic effect;
3) surperficial PSG(phosphate silicate glass, be phosphorosilicate glass) removal, remove silicon chip at the PSG that the Surface During of diffusion generates, avoid existence because of glassy layer to affect contacting of metal electrode and silicon chip, thus the conversion efficiency of raising battery;
4) conductive layer with the PN junction short circuit that forms at silicon chip edge in the diffusion process is removed in the removal of periphery P N;
5) preparation of antireflection layer at silicon chip surface deposition one deck silicon nitride antireflection layer, utilizes the film interference principle, reduces reflection of light, plays passivation, increases short circuit current and the power output of battery, improves conversion efficiency;
6) metallization processes, be printing and the sintering process of back electrode, positive electrode and back of the body electric field, adopt silver slurry print positive electrode and back electrode, adopt aluminium paste printing back of the body electric field, with collected current and play the effect of conduction, sintering is at high temperature to make between the electrode of printing and the silicon chip to form Ohmic contact.
Wherein, can metallization processes be the committed step of manufacture of solar cells, form the unit for electrical property parameters that good Ohmic contact is directly determining solar cell between electrode and the silicon chip.But in the sintering process of back electrode, positive electrode and back of the body electric field, the phenomenon that the thinner fringe region of aluminium forms coarse surface or aluminium ball can appear, silicon chip is produced break when component lamination or form hidden splitting, have a strong impact on stability and the quality of solar cell.
Summary of the invention
In view of this, the invention provides a kind of solar battery sheet and printing screen thereof, by changing the parameter of silk screen, avoided the thinner fringe region of aluminium to form the problem of rough surface or an aluminium ball, thereby can improve the conversion efficiency of solar cell.
For achieving the above object, the invention provides following technical scheme:
A kind of printing screen, described silk screen are parallel to the meshcount in hollow out zone, two edges of print direction less than the meshcount in other hollow out zones.
Preferably, hollow out zone in described edge is apart from the zone of silk screen edge 2mm-8mm, comprises endpoint value.
Preferably, in the hollow out zone, described two edges, the meshcount in each hollow out zone, edge be 250 orders/centimetre-325 orders/centimetre, comprise endpoint value.
Preferably, the meshcount in described other hollow out zones be 350 orders/centimetre-400 orders/centimetre, comprise endpoint value.
Preferably, described silk screen is woven wire or nonmetal silk screen.
A kind of solar battery sheet, the aluminium back surface field of this solar battery sheet adopt above-mentioned printing screen to print, wherein, and the even thickness of whole solar battery sheet aluminium back surface field.
Preferably, this solar battery sheet is N-type solar battery sheet or P type solar battery sheet.
Compared with prior art, technical scheme provided by the present invention has the following advantages:
Solar battery sheet provided by the invention and printing screen thereof, by changing the parameter of part edge hollow out zone silk screen, make the aluminium paste even thickness that prints on the whole silicon chip, avoided the thinner fringe region of aluminium when sintering temperature is higher, can form rough surface or play the aluminium ball owing to high and low temperature changes, increased the adjusting range of sintering temperature, thereby can improve surface electrical engagement capacity between solar battery sheet front electrode, backplate and the back of the body electric field by improving sintering temperature, and then finally improve the conversion efficiency of solar cell.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the printing screen schematic diagram of prior art solar cell;
Fig. 2 is the deformation schematic diagram of prior art solar cell printing screen;
Fig. 3 is the printing screen schematic diagram of embodiment of the invention solar cell.
The specific embodiment
Just as stated in the Background Art, in the sintering process of back electrode, positive electrode and back of the body electric field, the phenomenon that the thinner fringe region of aluminium forms coarse surface or aluminium ball can occur, silicon chip be produced break when component lamination or form hidden splitting, have a strong impact on stability and the quality of solar cell.
The inventor studies discovery, causes the reason of this phenomenon mainly to be, the consistent silk screen of parameter in the prior art, and schematic diagram as shown in Figure 1, except main grid line not the openwork part 100, the meshcount of openwork part 200 is all consistent.The deformation schematic diagram that the silk screen of prior art produces when printing, as shown in Figure 2, the silk screen 201 that the openwork part parameter is consistent, under the pressure-acting of scraper 202, the deformation of the deformation ratio marginal portion of silk screen mid portion is large, this be because the marginal portion of silk screen around under the pulling force effect of screen cloth 203 deformation less, the inconsistent situation of this deformation can cause the aluminium paste marginal portion that prints thinner than mid portion.When sintering temperature is higher; can comparatively fast make also difference of the different regional heat conducting speed of thickness in the aluminium paste because high and low temperature changes; thereby can make the thinner zone of aluminium produce hot-spot; and hot-spot can make aluminium paste be shrunk to alumina particles under the tension force of liquid; differing in size of alumina particles; the easy nucleation of large alumina particles forms the aluminium ball, and little alumina particles can cause coarse surface.
And in sintering process, higher sintering temperature can improve the surface electrical engagement capacity between solar battery sheet front electrode, backplate and the back of the body electric field, this is high because all be compared to the aluminium of back of the body electric field slurry as the sintering temperature of the silver of electrode slurry and silver-colored aluminium, the spike sintering temperature of silver is between 720-830 ℃, the spike sintering temperature of silver aluminium electrode is between 625-850 ℃, and the spike sintering temperature of aluminium is between 720-750 ℃.
Therefore, the inventor studies discovery, can improve the uniformity of aluminium back surface field thickness by the parameter that changes silk screen, thereby can improve surface electrical engagement capacity between solar battery sheet front electrode, backplate and the back of the body electric field by improving sintering temperature, and then finally improve the conversion efficiency of solar cell.
Based on this, the invention provides a kind of its printing screen, by changing the parameter of part edge hollow out zone silk screen, make the aluminium paste even thickness that prints on the whole silicon chip, avoid the fringe region that aluminium is thinner in the prior art to form the problem of rough surface or an aluminium ball, thereby can improve the conversion efficiency of solar cell.
More than be core concept of the present invention, can more become apparent for making above-mentioned purpose of the present invention, feature and advantage, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
A lot of details have been set forth in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here and implement, those skilled in the art can be in the situation that do similar popularization without prejudice to intension of the present invention, so the present invention is not subjected to the restriction of following public specific embodiment.
Secondly, the present invention is described in detail in conjunction with schematic diagram, when the embodiment of the invention is described in detail in detail; for ease of explanation; the profile of expression device architecture can be disobeyed general ratio and be done local the amplification, and described schematic diagram is example, and it should not limit the scope of protection of the invention at this.The three-dimensional space that in actual fabrication, should comprise in addition, length, width and the degree of depth.
Describe in detail below by several embodiment.
Embodiment one
The present embodiment provides a kind of printing screen, its schematic diagram as shown in Figure 3, S000 represents the print direction of scraper, except main grid not the openwork part S100, be parallel to the meshcount of two edge hollow out zone S200 of print direction S000 less than the meshcount of other hollow outs zones S300, namely the screen mesh area in each hollow out zone, edge is all less than the screen mesh area in other hollow out zones.Wherein, described silk screen is woven wire or nonmetal silk screen.
The hollow out zone, two edges of the described silk screen of the present embodiment, zone for distance silk screen edge 2mm-8mm, comprise endpoint value, the meshcount in each hollow out zone, edge be 250 orders/centimetre-325 orders/centimetre, the meshcount in other hollow out zones be 350 orders/centimetre-400 orders/centimetre.That is to say, in the hollow out zone, described two edges, the screen mesh area in each hollow out zone, edge is 0.31mm
2-0.4mm
2, comprising endpoint value, the screen mesh area in other hollow out zones is 0.25mm
2-0.29mm
2, comprise endpoint value.
Hence one can see that, the present embodiment is by changing the parameter of part edge hollow out zone silk screen, make the screen mesh in hollow out zone, two edges greater than the screen mesh in other hollow out zones, and mesh is larger, the permeability of slurry is better, the aluminium back surface field in hollow out zone, two edges is thicker, thereby improved the uniformity of whole aluminium back surface field thickness, and the inhomogeneity raising of aluminium back surface field can avoid the thinner fringe region of aluminium when sintering temperature is higher, can be owing to high and low temperature changes the problem that forms rough surface or play the aluminium ball, increased the adjusting range of sintering temperature, for the conversion efficiency that improves solar cell provides the foundation.
Embodiment two
The present embodiment provides a kind of solar battery sheet, and the aluminium back surface field of this solar battery sheet adopts the printing screen described in above-described embodiment to print, wherein, and the even thickness of whole solar battery sheet aluminium back surface field.
The preferred solar battery sheet of the present embodiment is N-type solar battery sheet or P type solar battery sheet.
The aluminium back surface field of the solar battery sheet in the present embodiment adopts the printing screen described in above-described embodiment to print, make the aluminium back surface field even thickness that prints on the whole silicon chip, increased the adjusting range of sintering temperature, thereby can improve surface electrical engagement capacity between solar battery sheet front electrode, backplate and the back of the body electric field by improving sintering temperature, and then finally improve the conversion efficiency of solar cell.
Above-mentioned explanation makes this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a printing screen is characterized in that, described silk screen is parallel to the meshcount in hollow out zone, two edges of print direction less than the meshcount in other hollow out zones.
2. printing screen according to claim 1 is characterized in that, hollow out zone in described edge is apart from the zone of silk screen edge 2mm-8mm, comprises endpoint value.
3. printing screen according to claim 2 is characterized in that, in the hollow out zone, described two edges, the meshcount in each hollow out zone, edge be 250 orders/centimetre-325 orders/centimetre, comprise endpoint value.
4. printing screen according to claim 3 is characterized in that, the meshcount in described other hollow out zones be 350 orders/centimetre-400 orders/centimetre, comprise endpoint value.
5. described printing screen is characterized in that according to claim 1-4, and described silk screen is woven wire or nonmetal silk screen.
6. a solar battery sheet is characterized in that, the aluminium back surface field of this solar battery sheet adopts printing screen claimed in claim 1 to print, wherein, and the even thickness of whole solar battery sheet aluminium back surface field.
7. solar battery sheet according to claim 6 is characterized in that, this solar battery sheet is N-type solar battery sheet or P type solar battery sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210575675.XA CN103029423B (en) | 2012-12-25 | 2012-12-25 | Solar battery sheet and printing screen thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210575675.XA CN103029423B (en) | 2012-12-25 | 2012-12-25 | Solar battery sheet and printing screen thereof |
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| CN103029423A true CN103029423A (en) | 2013-04-10 |
| CN103029423B CN103029423B (en) | 2015-08-26 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104211286A (en) * | 2014-09-22 | 2014-12-17 | 天津沽上真空玻璃制造有限公司 | Distribution method of vacuum glass supports |
| CN105346212A (en) * | 2015-11-30 | 2016-02-24 | 安徽亚源印染有限公司 | Multi-net combined rotary screen printing equipment |
| CN106992219A (en) * | 2017-05-11 | 2017-07-28 | 盐城天合国能光伏科技有限公司 | A kind of solar cell Al-BSF structure and preparation method thereof |
| CN107031174A (en) * | 2015-11-20 | 2017-08-11 | 先进装配***有限责任两合公司 | Method and apparatus for selecting a paste stencil for paste printing by means of the selected paste stencil and applying paste to a substrate |
| WO2018219134A1 (en) * | 2017-06-02 | 2018-12-06 | 京东方科技集团股份有限公司 | Printing screen and printing method |
| CN109968799A (en) * | 2019-04-29 | 2019-07-05 | 苏州腾晖光伏技术有限公司 | Halftone and crystal silicon battery back electrode preparation method for crystal silicon battery back electrode |
| CN110757945A (en) * | 2019-12-02 | 2020-02-07 | 信利（惠州）智能显示有限公司 | Printing screen and printing device |
| CN110884245A (en) * | 2019-11-12 | 2020-03-17 | 国家电投集团黄河上游水电开发有限责任公司 | Solar cell screen printing half tone device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104211286A (en) * | 2014-09-22 | 2014-12-17 | 天津沽上真空玻璃制造有限公司 | Distribution method of vacuum glass supports |
| CN104211286B (en) * | 2014-09-22 | 2017-07-21 | 天津沽上真空玻璃制造股份有限公司 | The distribution method of vacuum glass support |
| CN107031174A (en) * | 2015-11-20 | 2017-08-11 | 先进装配***有限责任两合公司 | Method and apparatus for selecting a paste stencil for paste printing by means of the selected paste stencil and applying paste to a substrate |
| CN105346212A (en) * | 2015-11-30 | 2016-02-24 | 安徽亚源印染有限公司 | Multi-net combined rotary screen printing equipment |
| CN106992219A (en) * | 2017-05-11 | 2017-07-28 | 盐城天合国能光伏科技有限公司 | A kind of solar cell Al-BSF structure and preparation method thereof |
| CN106992219B (en) * | 2017-05-11 | 2018-05-29 | 盐城天合国能光伏科技有限公司 | A kind of solar cell Al-BSF structure and preparation method thereof |
| WO2018219134A1 (en) * | 2017-06-02 | 2018-12-06 | 京东方科技集团股份有限公司 | Printing screen and printing method |
| CN109968799A (en) * | 2019-04-29 | 2019-07-05 | 苏州腾晖光伏技术有限公司 | Halftone and crystal silicon battery back electrode preparation method for crystal silicon battery back electrode |
| CN110884245A (en) * | 2019-11-12 | 2020-03-17 | 国家电投集团黄河上游水电开发有限责任公司 | Solar cell screen printing half tone device |
| CN110757945A (en) * | 2019-12-02 | 2020-02-07 | 信利（惠州）智能显示有限公司 | Printing screen and printing device |
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| CN103029423B (en) | 2015-08-26 |
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