CN102034903A - Method for treating electric leakage of surface of silicon solar battery - Google Patents
Method for treating electric leakage of surface of silicon solar battery Download PDFInfo
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- CN102034903A CN102034903A CN2010105382220A CN201010538222A CN102034903A CN 102034903 A CN102034903 A CN 102034903A CN 2010105382220 A CN2010105382220 A CN 2010105382220A CN 201010538222 A CN201010538222 A CN 201010538222A CN 102034903 A CN102034903 A CN 102034903A
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Abstract
The invention discloses a method for treating electric leakage of a surface of a silicon solar battery, which comprises the following process steps: detecting and marking the position of an electric leakage region; and coating a corrosive liquid in the position of the electric leakage region for removing the electric leakage region by corrosion, wherein the corrosive liquid comprises the following components: 80-120 parts of deionized water, 140-160 parts of hydrogen fluoride and 90-110 parts of nitric acid. In the invention, the mixed solution of nitric acid and hydrofluoric acid is used for removing the electric leakage region of the surface by corrosion, the method can be realized simply and easily, and the effect is obvious. The invention solves the problems that because the electric leakage is serious and the parallel resistance of the battery is too small, the battery can not be used in a photovoltaic module, and the battery efficiency is lowered.
Description
Technical field
The present invention relates to the silicon solar cell field, specifically relate to a kind of processing silicon solar energy battery surface electric leakage
Method.
Background technology
The PN junction of solar cell surface can produce a lot of defectives in manufacture process, these defectives can't be removed with the method for edge etching, the electric current of collecting can drain to another defective through these defectives, and without load, the zone that comprises these defectives is called as the surface leakage district.The surface leakage district of solar cell has a significant impact battery performance, and electric leakage can increase reverse current, reduces maximum power, open circuit voltage, fill factor, curve factor, thus the efficient of battery is reduced, in addition, the serious battery parallel resistance of leaking electricity is too little, can't use in photovoltaic module.
The distribution in surface leakage district can be measured with thermal infrared imager, and when adding repercussion voltage to solar cell, drain region flows through very big electric current, and the Joule heat of generation raises some areas temperature.At this moment the high-temperature region of shooting with thermal infrared imager is exactly a drain region, can determine the area and the position of drain region by infrared thermoviewer, by the area of drain region, it is divided into concentrates drain region and disperse drain region.
In order to understand drain region better, find the direction of removing drain region, successively used the infrared camera peek 195
The drain region of the common p type single crystal silicon battery sheet that the sheet parallel resistance is little, Fig. 1～4 have been enumerated four kinds of typical electric leakage images.The high drain region of red expression temperature does not find that in sample the silicon chip edge temperature raises, and illustrates that there is good passivation at battery sheet edge through plasma etching industrial.The position of drain region mainly contains four kinds of situations: near under the delete line at battery sheet edge, near the main delete line two ends, main delete line and cut place.
What use in the above-mentioned test is the TI50 infrared thermoviewer of FLUKE company, and its band is the 8-14 micron, and temperature resolution is 0.05 ℃ under the spatial resolution 1.3mrad normal temperature.
Find that in addition wherein 130 drain region concentrates on one or two aspect of battery sheet.As Fig. 1, Fig. 2, shown in Figure 4.Have the battery sheet of concentrated drain region to account for 68.2% of gross sample number, all the other drain region distribution areas of 62 are big, as shown in Figure 3, have and disperse the battery sheet of drain region to account for 31.8% of gross sample number.
By above-mentioned analysis as can be known, the great majority in the drain batteries sheet belong to the situation of concentrating electric leakage, get final product so only need to concentrate drain region to remove.
In conjunction with the battery sheet infrared image that obtains in the experiment, the reason of will leaking electricity is divided into following four kinds:
1, the machinery of diffusion layer and metal delete line scratches:
If the diffusion layer that is scratched just in time under the metal delete line, the place of scuffing can because do not have PN junction every
From and leak electricity: often observe the place electric leakage that the metal delete line is scratched in the experiment.Reason is that the PN junction under the metal delete line is caused electric leakage by false reasoning destruction, reduces the friction of silicon chip and other hard things in diffusion and can avoid this type of electric leakage;
2, stain the contamination precipitation that causes:
The drain region of observing in the experiment is on not by plated diffusion layer, infer this type of electric leakage be because of
Contamination precipitation causes, so should keep the technology cleaning after silicon chip cleans, avoids introducing metal, organic pollutants;
3, the edge over etching that causes of plasma etching:
A lot of electric leakages zone is under the delete line of silicon chip edge in the experiment, and this type of electric leakage is because the plasma edge is carved
The erosion over etching diminishes the diffusion layer at edge, and the metal piercing PN junction causes electric leakage in the time of sintering, so should improve the technology stability of plasma edge etching, reduces over etching;
4, diffusion layer and SiNx see that reflectance coating is in uneven thickness:
The uniformity of temperature field and airflow field can influence the uniformity of diffusion layer in the diffusion process, the SiNx anti-reflection
Penetrate and have the pin hole existence in the film.Burn part when these all can cause the electrode sintering.Should guarantee the uniformity of diffusion layer and antireflective coating.
Summary of the invention
Goal of the invention:, the invention provides a kind of method of removing the silicon solar energy battery surface drain region in order to solve the deficiencies in the prior art.
Technical scheme: in order to realize above purpose, the method for processing silicon solar energy battery surface electric leakage of the present invention, its processing step is as follows:
(1), detects the position of drain region and mark;
(2), corrosive liquid is coated in the position of drain region, carry out the erosion removal drain region; Described corrosive liquid proportioning consists of: 80～120 parts of deionized waters, 140～160 parts in hydrogen fluoride, 90～110 parts in nitric acid.
Wherein, the method for the position of described detection drain region is: add repercussion voltage for the battery sheet, find the position of drain region with thermal infrared imager.
Wherein, in order not influence battery performance, and obtain corrosive effect preferably, the time of the erosion removal electric leakage described in the step (2) is 5～30 minutes.
Consider that from the corrosive effect angle described corrosive liquid optimum ratio consists of: 100 parts of deionized waters, 150 parts in hydrogen fluoride, 100 parts in nitric acid.
The principle of above-mentioned corrosive liquid effect drain region is: corrosive liquid is coated in the position of concentrating drain region, and AG delete line and silicon diffusion layer that this is regional all can and erode, and the reaction of generation is as follows:
3Ag+4HNO3=3AgNO3+2H2O+NO↑
Si+HNO3+6HF=H2SiF6+HNO2+H2O+H2↑
Like this electrode and the diffusion layer of drain region are removed, the electric current of collecting just can't flow to another electrode by electrode and diffusion layer, so just solve the problem of electric leakage.
Beneficial effect: the present invention compared with prior art has the following advantages: the present invention is by researching and analysing the actual conditions of battery surface drain region, take effective method to remove drain region in the set of surfaces, adopt the mixed solution corrosion of nitric acid hydrofluoric acid to remove the surface leakage district, method is simple, effect is obvious, solved because the serious battery parallel resistance of electric leakage is too little, can't in photovoltaic module, use, the problem that battery efficiency reduces.
Description of drawings
Fig. 1 is the infrared image under the close delete line at battery sheet edge in the position of drain region;
Fig. 2 is the infrared image of the position of drain region at main delete line two ends;
Fig. 3 is near the infrared image of position main delete line of drain region;
Fig. 4 is the infrared image of the position of drain region at the cut place;
Fig. 5 is that P works as the infrared image of battery sheet before processing among the embodiment 1;
Fig. 6 is that P works as battery sheet infrared image after treatment among the embodiment 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used to the present invention is described and is not used in and limit the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
Use instrument: the TI50 infrared thermoviewer of FLUKE company, its band are the 8-14 micron, spatial resolution 1.3mrad, and temperature resolution is 0.05 ℃ under the normal temperature.
Embodiment 1:
A kind of method of handling the silicon solar energy battery surface electric leakage, its processing step is as follows:
(1), add repercussion voltage when the battery sheet for a slice P, find the position of drain region and the position of mark drain region with thermal infrared imager;
(2), corrosive liquid is coated in the position of drain region, carry out the erosion removal drain region, the time of erosion removal drain region is 10 minutes; Described corrosive liquid proportioning consists of: deionized water 100ml, hydrogen fluoride 150 ml, nitric acid 100 ml.
Embodiment 2:
A kind of method of handling the silicon solar energy battery surface electric leakage, its processing step is as follows:
(1), add repercussion voltage when the battery sheet for a slice P, find the position of drain region and the position of mark drain region with thermal infrared imager;
(2), corrosive liquid is coated in the position of drain region, carry out the erosion removal drain region, the time of erosion removal drain region is 30 minutes; Described corrosive liquid proportioning consists of: deionized water 120 ml, hydrogen fluoride 160 ml, nitric acid 90 ml.
Embodiment 3:
A kind of method of handling the silicon solar energy battery surface electric leakage, its processing step is as follows:
(1), add repercussion voltage when the battery sheet for a slice P, find the position of drain region and the position of mark drain region with thermal infrared imager;
(2), corrosive liquid is coated in the position of drain region, carry out the erosion removal drain region, the time of erosion removal drain region is 5 minutes; Described corrosive liquid proportioning consists of: deionized water 80 ml, hydrogen fluoride 140 ml, nitric acid 110 ml.
Embodiment 4:
Embodiment 1 described P is worked as the battery sheet adopts infrared thermoviewer to carry out detection of electrical leakage before processing, it is applied reverse voltage is 2.3V, record submarginal place, battery sheet left side a concentrated drain region is arranged, the result handles through embodiment 1 described method as shown in Figure 5, promptly through after the corrosion in 10 minutes, reverse voltage that it applies or 2.3V, can't see original drain region among the figure of its infrared image, as shown in Figure 6, illustrate that original drain region has been corroded to get rid of.
Following table 1 is the IV data of battery sheet before and after the corrosion, and after the erosion removal drain region, the battery sheet is by the P washer
Become the C washer, the parallel resistance of battery sheet is increased to 30.86ohm by 1.47ohm, and battery sheet conversion efficiency has descended 0.1%.
The decline of conversion efficiency is because corrosive liquid at battery sheet surface spreading, makes large tracts of land delete line and matte by broken
Bad, reduced the effective area of battery sheet, the area that destroys for the liquid that reduces to be corroded can be pressed on the drain region with a rubber ring, the sprawling of limit corrosion liquid.
The IV data of battery before and after table 1 chemical corrosion
| ? | Class | VOC(V) | Isc(A) | Rs(m.ohm) | Rsh(ohm) | FF(%) | EFF(%) |
| Before the corrosion | Trash | 0.617 | 5.37 | 4.249 | 1.47 | 74.9 | 16.75 |
| After the corrosion | P | 0.617 | 5.27 | 6.057 | 30.86 | 76.0 | 16.65 |
Above result shows, the method of processing silicon solar energy battery surface electric leakage of the present invention can be removed the drain region of battery, solved since the electric leakage efficient of silicon solar cell is descended greatly, and the electric leakage seriously cause the battery parallel resistance too little, the problem that can't in photovoltaic module, use.
Claims (4)
1. handle the method that silicon solar energy battery surface leaks electricity for one kind, it is characterized in that: its processing step is as follows:
(1), detects the position of drain region and mark;
(2), corrosive liquid is coated in the position of drain region, carry out the erosion removal drain region; Described corrosive liquid proportioning consists of: 80～120 parts of deionized waters, 140～160 parts in hydrogen fluoride, 90～110 parts in nitric acid.
2. a kind of method of handling the silicon solar energy battery surface electric leakage according to claim 1, it is characterized in that: the method for the position of described detection drain region is: add repercussion voltage for the battery sheet, find the position of drain region with thermal infrared imager.
3. a kind of method of handling the silicon solar energy battery surface electric leakage according to claim 1 and 2 is characterized in that: the time of the erosion removal electric leakage described in the step (2) is 5～30 minutes.
4. a kind of method of handling the silicon solar energy battery surface electric leakage according to claim 1 and 2, it is characterized in that: described corrosive liquid proportioning consists of: 100 parts of deionized waters, 150 parts in hydrogen fluoride, 100 parts in nitric acid.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746028A (en) * | 2013-12-24 | 2014-04-23 | 宁夏银星能源股份有限公司 | Crystalline silicon solar cells edge local electric leakage processing method |
| CN104882512A (en) * | 2014-05-12 | 2015-09-02 | 江西瑞晶太阳能科技有限公司 | Method for increasing parallel resistance of crystalline silicon battery piece |
| CN112701186A (en) * | 2020-12-25 | 2021-04-23 | 韩华新能源（启东）有限公司 | Label manufacturing method for thermosensitive camera position detection, label and detection method |
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| CN101404308A (en) * | 2008-11-13 | 2009-04-08 | 中山大学 | Solar cell renovation method by utilizing patch renovation method |
| CN101777605A (en) * | 2010-03-15 | 2010-07-14 | 山东力诺太阳能电力股份有限公司 | Crystalline silicon solar battery edge etching process |
| CN101789465A (en) * | 2010-01-08 | 2010-07-28 | 中山大学 | Defect remedying method of crystalline silicon solar cell |
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2010
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Patent Citations (5)
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| US4483063A (en) * | 1981-02-02 | 1984-11-20 | University Of Florida | Oxide charge induced high low junction emitter solar cell |
| CN101179100A (en) * | 2007-01-17 | 2008-05-14 | 江苏林洋新能源有限公司 | Manufacturing method of large area low bending flexure ultra-thin type double face lighting solar cell |
| CN101404308A (en) * | 2008-11-13 | 2009-04-08 | 中山大学 | Solar cell renovation method by utilizing patch renovation method |
| CN101789465A (en) * | 2010-01-08 | 2010-07-28 | 中山大学 | Defect remedying method of crystalline silicon solar cell |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746028A (en) * | 2013-12-24 | 2014-04-23 | 宁夏银星能源股份有限公司 | Crystalline silicon solar cells edge local electric leakage processing method |
| CN103746028B (en) * | 2013-12-24 | 2016-05-11 | 宁夏银星能源股份有限公司 | The processing method of the local electric leakage in crystal silicon solar batteries sheet edge |
| CN104882512A (en) * | 2014-05-12 | 2015-09-02 | 江西瑞晶太阳能科技有限公司 | Method for increasing parallel resistance of crystalline silicon battery piece |
| CN112701186A (en) * | 2020-12-25 | 2021-04-23 | 韩华新能源（启东）有限公司 | Label manufacturing method for thermosensitive camera position detection, label and detection method |
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Application publication date: 20110427 |