Textured structure of crystalline silicon solar cell and preparation method thereof

A technology of solar cells and crystalline silicon, which is applied in the field of solar cells and can solve problems such as unfavorable industrial production and complicated processes

Active Publication Date: 2016-01-06
CSI CELLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent application WO2014120830 (A1) discloses a method for preparing crystalline silicon nano-texture, which controls the shape of nano-texture by annealing, but the method is complicated and not conducive to the needs of industrial production

Method used

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  • Textured structure of crystalline silicon solar cell and preparation method thereof
  • Textured structure of crystalline silicon solar cell and preparation method thereof
  • Textured structure of crystalline silicon solar cell and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0092] see image 3 Shown, a kind of preparation method of the textured structure of polycrystalline silicon solar cell is made up of following steps:

[0093] (1) cleaning the silicon wafer and removing the surface damage layer;

[0094] (2) Putting the above-mentioned silicon chip into a chemical etching solution containing metal ions to form a nanowire or porous silicon structure on the surface of the silicon chip; the temperature is 30° C., and the time is 2 minutes;

[0095] The metal ion is selected from silver ion;

[0096] The chemical etching solution is selected from HF and H 2 o 2 mixed solution;

[0097] Among them, the concentration of HF is 10mol / L, H 2 o 2 The concentration is 0.4mol / L;

[0098] (3) Putting the above-mentioned silicon chip into the first chemical etching solution for corrective etching, so that the above-mentioned nanowire or porous silicon structure forms a nano-deep hole structure;

[0099] The first chemical etching solution is HNO 3...

Embodiment 2

[0111] see Figure 4 Shown, a kind of preparation method of the textured structure of polycrystalline silicon solar cell is made up of following steps:

[0112] (1) cleaning the silicon wafer and removing the surface damage layer;

[0113] (2) Putting the above-mentioned silicon chip into a chemical etching solution containing metal ions to form a nanowire or porous silicon structure on the surface of the silicon chip; the temperature is 30° C., and the time is 2 minutes;

[0114] The metal ion is selected from silver ion;

[0115] The chemical etching solution is selected from HF and H 2 o 2 mixed solution;

[0116] Among them, the concentration of HF is 10mol / L, H 2 o 2 The concentration is 0.4mol / L;

[0117] (3) Putting the above-mentioned silicon chip into the first chemical etching solution for corrective etching, so that the above-mentioned nanowire or porous silicon structure forms a nano-deep hole structure;

[0118] The first chemical etching solution is HNO ...

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Abstract

The invention discloses a textured structure of a crystalline silicon solar cell and a preparation method thereof. The textured structure is mainly composed of a plurality of microstructures respectively similar to an inverted pyramid. The lower part of each microstructure similar to the inverted pyramid is an inverted pyramid structure, and the upper part is an inverted truncated cone structure. The top part of the each microstructure similar to the inverted pyramid is formed by one or more from a circle, an ellipse or a closed figure formed by a plurality of curves. Proved by experiments, and compared with a textured structure disclosed in the invention WO2014120830 (A1), the conversion efficiency of the cell sheet provided by the invention is improved by 0.25-0.4%, and an unexpected effect is achieved.

Description

technical field [0001] The invention relates to a textured surface structure of a crystalline silicon solar cell and a preparation method thereof, belonging to the technical field of solar cells. Background technique [0002] With the wide application of solar cell components, photovoltaic power generation occupies an increasingly important proportion in new energy and has achieved rapid development. Among the current commercialized solar cell products, crystalline silicon (monocrystalline and polycrystalline) solar cells have the largest market share, maintaining a market share of more than 85%. [0003] At present, in the production process of solar cells, the textured structure on the surface of silicon wafers can effectively reduce the surface reflectance of solar cells, which is one of the important factors affecting the photoelectric conversion efficiency of solar cells. In order to obtain a good textured structure on the surface of crystalline silicon solar cells to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0236H01L31/0232H01L21/306H01L21/308B82Y40/00
CPCB82Y40/00H01L21/30604H01L21/3081H01L21/3085H01L21/3086H01L31/02327H01L31/02363H01L31/1804H01L21/306H01L21/308Y02E10/52Y02E10/547Y02P70/50C01B33/02C01P2004/03H01L31/054
Inventor 邹帅王栩生邢国强
Owner CSI CELLS CO LTD
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