阅读说明：本技术 一种提升返工片效率良率的制绒工艺 (Texturing process for improving efficiency and yield of reworked sheets ) 是由 沈亚光 王博 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种太阳能电池片返工工艺添加剂,包括以下组分：乙基纤维素、三乙醇胺、十二烷基苯磺酸钠、聚乙烯吡咯烷酮、苯氧乙醇、丙烯酸丁酯、曲拉通、去离子水。将该添加剂应用于返工片制绒,能够显著降低返工片反射率和花片、旧色片发生率,提升太阳能电池片光电转换效率和A级率。本发明还公开一种提升返工片效率良率的制绒工艺。(The invention discloses a rework process additive for solar cells, which comprises the following components: ethyl cellulose, triethanolamine, sodium dodecyl benzene sulfonate, polyvinylpyrrolidone, phenoxyethanol, butyl acrylate, triton and deionized water. The additive is applied to the texturing of reworked sheets, the reflectivity of the reworked sheets and the incidence rate of patterned sheets and old color sheets can be obviously reduced, and the photoelectric conversion efficiency and the A-level rate of the solar cell sheet are improved. The invention also discloses a texturing process for improving the efficiency and yield of reworked sheets.)

1. The reworking process additive for the solar cell is characterized by comprising the following components:

ethyl cellulose, triethanolamine, sodium dodecyl benzene sulfonate, polyvinylpyrrolidone, phenoxyethanol, butyl acrylate, triton and deionized water.

2. The solar cell rework process additive as claimed in claim 1, wherein the mass fractions of the components are as follows: 1-1.7% of ethyl cellulose, 3-5% of triethanolamine, 2-2.5% of sodium dodecyl benzene sulfonate, 0.5-1% of polyvinylpyrrolidone, 1-1.5% of phenoxyethanol, 1-2% of butyl acrylate, 0.5-1% of triton and the balance of deionized water.

3. The solar cell rework process additive as claimed in claim 1, wherein the mass fractions of the components are as follows: 1.5% of ethyl cellulose, 4% of triethanolamine, 2.3% of sodium dodecyl benzene sulfonate, 0.8% of polyvinylpyrrolidone, 1.3% of phenoxyethanol, 1.5% of butyl acrylate, 0.8% of triton and the balance of deionized water.

4. Use of the solar cell rework process additive of any of claims 1-3 in a solar cell rework process.

5. A texturing process for improving efficiency and yield of reworked sheets is characterized by comprising the following steps:

(1) adding HNO into a texturing groove₃HF and water, and then adding the additive of any one of claims 1-3 for mixing;

(2) putting the reworked sheet into a texturing groove for texturing;

(3) and after the texturing is finished, washing and drying the reworked sheets in sequence.

6. The texturing process for improving efficiency and yield of rework wafers as claimed in claim 5, wherein in step (1), HNO₃HF, water and additives in a volume ratio of 218: 104: 154: 8, the HNO₃The concentration is 65%, the HF concentration is 50%, and the water is pure water.

7. The process of claim 5, wherein in step (2), the temperature of the texturing process is controlled to be 5-6 ℃, and the etching depth is controlled to be 0.15 μm-0.5 μm.

8. The texturing process for improving the efficiency and yield of rework sheets as claimed in claim 5, wherein in step (3), the washing process comprises: and (4) sequentially carrying out water washing, alkali washing, water washing, acid washing and water washing on the reworked sheet after the texturing is finished.

Technical Field

The invention relates to the field of solar cell preparation, in particular to a texturing process for improving the efficiency and yield of reworked sheets.

Background

The polycrystalline silicon solar cell texturing process adopts HNO₃the/HF and the water react according to a certain proportion to obtain a desired suede so as to reduce the reflection of the solar cell piece to light, enhance the absorption of the light and further achieve the purpose of improving the photoelectric conversion efficiency.

The existing reworked piece texturing process comprises the following steps: adding 80-100L DI-water into the original liquid medicine (HNO3/HF and water) for diluting, controlling the temperature at 6 deg.C, reducing the solution concentration, and controlling the corrosion depth at 0.15-0.5 um. When reworked sheets are produced, the conventional process usually causes the reduction of the photoelectric conversion efficiency and the A-level rate of the solar cell sheet due to higher reflectivity (more than 26%) after texturing and high incidence of pattern sheets and old color sheets.

Disclosure of Invention

In order to solve the technical problems, the invention discloses a reworking process additive for a solar cell, which is applied to the texturing of reworked sheets, can obviously reduce the reflectivity of the reworked sheets and the incidence rate of patterned sheets and old color sheets, and improves the photoelectric conversion efficiency and the A-level rate of the solar cell.

The invention also discloses a texturing process for improving the efficiency and yield of reworked sheets.

The invention is realized by the following technical scheme:

the reworking process additive for the solar cell comprises the following components:

ethyl cellulose, triethanolamine, sodium dodecyl benzene sulfonate, polyvinylpyrrolidone, phenoxyethanol, butyl acrylate, triton and deionized water.

Further, the mass fractions of the components are as follows: 1-1.7% of ethyl cellulose, 3-5% of triethanolamine, 2-2.5% of sodium dodecyl benzene sulfonate, 0.5-1% of polyvinylpyrrolidone, 1-1.5% of phenoxyethanol, 1-2% of butyl acrylate, 0.5-1% of triton and the balance of deionized water.

Preferably, the mass fractions of the components are as follows: 1.5% of ethyl cellulose, 4% of triethanolamine, 2.3% of sodium dodecyl benzene sulfonate, 0.8% of polyvinylpyrrolidone, 1.3% of phenoxyethanol, 1.5% of butyl acrylate, 0.8% of triton and the balance of deionized water.

An application of a solar cell rework process additive in a solar cell rework process.

A texturing process for improving efficiency and yield of reworked sheets comprises the following steps:

(1) adding HNO into a texturing groove₃HF and water, adding the above additives, and mixingHomogenizing;

(2) putting the reworked sheet into a texturing groove for texturing;

(3) and after the texturing is finished, washing and drying the reworked sheets in sequence.

Wherein, in the step (1), HNO₃HF, water and additives in a volume ratio of 218: 104: 154: 8, the HNO₃The concentration is 65%, the HF concentration is 50%, and the water is pure water.

Furthermore, in the step (2), the temperature in the wool making process is controlled to be 5-6 ℃, and the corrosion depth is controlled to be 0.15-0.5 μm.

Further, in the step (3), the washing process comprises the following steps: and (4) sequentially carrying out water washing, alkali washing, water washing, acid washing and water washing on the reworked sheet after the texturing is finished.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. according to the reworking process additive for the solar cell, disclosed by the invention, the additive is applied to the texturing of the reworked cell, so that the reflectivity of the reworked cell and the incidence rate of the pattern cell and the old color cell can be obviously reduced, and the photoelectric conversion efficiency and the A-level rate of the solar cell are improved;

2. according to the texturing process for improving the efficiency and yield of the reworked sheet, disclosed by the invention, in the texturing process of the reworked sheet, the additive is added into the texturing groove, so that the reflectivity of the reworked sheet and the incidence rate of the pattern sheet and the old color sheet can be obviously reduced, and the photoelectric conversion efficiency and the A-level rate of the solar cell sheet are improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a graph of the reflectivity of a rework sheet of the present invention;

FIG. 2 is a graph of the photoelectric conversion efficiency of a rework sheet of the present invention;

FIG. 3 is a schematic diagram of the performance of a rework sheet of the invention;

FIG. 4 is a comparison of the appearance properties of rework sheets of the invention;

FIG. 5 is a schematic view of the yield of rework wafer A of the present invention;

FIG. 6 is a 50 times magnified texture contrast view of a rework sheet microscope of the present invention: the left side is the suede made by adopting a new reworking process, and the right side is the suede made by adopting a traditional reworking process.

In fig. 1, 2, 3, and 5, the abscissa represents the time when the rework sheet texturing is performed.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.