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Polycrystalline silicon solar cell with high photoelectric conversion efficiency and method for preparing same

A technology for photoelectric conversion efficiency and solar cells, which is applied in photovoltaic power generation, circuits, electrical components, etc., and can solve the problems of poor uniformity of silicon wafer texture and unfavorable photoelectric conversion efficiency of polycrystalline silicon solar cells.

Inactive Publication Date: 2019-12-06
浙江利博能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the polycrystalline silicon solar cell is textured according to the prior art, the uniformity of the textured surface of the obtained silicon wafer is relatively poor, which is not conducive to improving the photoelectric conversion efficiency of the polycrystalline silicon solar cell.

Method used

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  • Polycrystalline silicon solar cell with high photoelectric conversion efficiency and method for preparing same
  • Polycrystalline silicon solar cell with high photoelectric conversion efficiency and method for preparing same
  • Polycrystalline silicon solar cell with high photoelectric conversion efficiency and method for preparing same

Examples

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Embodiment 1

[0066] A polycrystalline silicon solar cell with high photoelectric conversion efficiency, the polycrystalline silicon solar cell includes a polycrystalline silicon chip 1, the front side 11 of the polycrystalline silicon chip 1 is a textured surface 2 formed by etching and textured, and the depth of the groove 21 of the textured surface 2 is 3 μm, The length of the groove 22 of the suede 2 is 8 μm, the width of the groove 22 of the suede 2 is 1 μm, and three layers of anti-reflection films 3 are deposited on the upper surface of the suede 2, and the three layers of anti-reflection films 3 are all silicon nitride films. The layer anti-reflection film 3 includes a first layer of film 31, a second layer of film 32 and a third layer of film 33. The first layer of film 31 covers the front side 11 of the polysilicon wafer 1 and has a first refractive index and a first thickness. A layer of film 32 covers the upper surface of the first layer of film 31 and has a second refractive ind...

Embodiment 2

[0086] A polycrystalline silicon solar cell with high photoelectric conversion efficiency, the polycrystalline silicon solar cell includes a polycrystalline silicon chip 1, the front side 11 of the polycrystalline silicon chip 1 is a textured surface 2 formed by etching and textured, and the depth of the groove 21 of the textured surface 2 is 3.2 μm , the length of the groove 21 of the suede 2 is 8.5 μm, the width of the groove 21 of the suede 2 is 1.5 μm, and three layers of anti-reflection films 3 are deposited on the upper surface of the suede 2, and the three layers of anti-reflection films 3 are silicon nitride The three-layer anti-reflection film 3 includes a first layer of film 31, a second layer of film 32 and a third layer of film 33. The first layer of film 31 covers the front side 11 of the polysilicon wafer 1 and has a first refractive index and a first thickness. , the second layer of film 32 covers the upper surface of the first layer of film 31 and has a second r...

Embodiment 3

[0106] A polycrystalline silicon solar cell with high photoelectric conversion efficiency, the polycrystalline silicon solar cell includes a polycrystalline silicon chip 1, the front side 11 of the polycrystalline silicon chip 1 is a textured surface 2 formed by etching the textured surface, and the depth of the groove 21 of the textured surface 2 is 3.5 μm , the length of the groove 21 of the textured surface 2 is 10 μm, the width of the groove 21 of the textured surface 2 is 2 μm, and three layers of anti-reflection films 3 are deposited on the upper surface of the textured surface 2, and the three layers of anti-reflection films 3 are all silicon nitride films, The three-layer anti-reflection film 3 includes a first layer of film 31, a second layer of film 32 and a third layer of film 33. The first layer of film 31 covers the front side 11 of the polysilicon wafer 1 and has a first refractive index and a first thickness. The second layer of film 32 covers the upper surface o...

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Abstract

The invention discloses a polycrystalline silicon solar cell with high photoelectric conversion efficiency and a method for preparing the same. The polycrystalline silicon solar cell includes a polycrystalline silicon wafer, wherein the front surface of the polycrystalline silicon wafer is a textured surface, three layers of silicon nitride are deposited on the upper surface of the textured surface, a positive electrode is printed on the front surface of the polycrystalline silicon wafer, and a negative electrode is printed on the back surface of the polycrystalline silicon wafer. The method for preparing the polycrystalline silicon solar cell comprises performing detection and cleaning; performing texturing; performing diffusion knotting; performing a dephosphorized silicon glass treatment; preparing a silicon nitride reflective layer; printing positive and negative electrodes; and performing sintering. A uniform textured surface can be formed on the surface of the polycrystalline silicon wafer by texturing twice, thereby contributing to improvement in the photoelectric conversion efficiency of the polycrystalline silicon wafer. The three layers of silicon nitride are deposited onthe surface of the polycrystalline silicon wafer so as to achieve a good passivation effect on the surface of the polycrystalline silicon wafer and improve the photoelectric conversion efficiency ofthe polycrystalline silicon wafer. An electrical performance test result shows that the polycrystalline silicon solar cell prepared by the method has high photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of polycrystalline silicon solar cells, in particular to a polycrystalline silicon solar cell with high photoelectric conversion efficiency and a preparation method thereof. Background technique [0002] With the rapid development of society and economy, the demand for energy is increasing day by day, the depletion of fossil energy and the pollution to the ecological environment are seriously threatening the sustainable development of society and economy. Therefore, there is an urgent need to replace it with renewable energy. A solar cell is a semiconductor device that directly converts solar energy into electrical energy. Because it is a green product, it will not cause environmental pollution, and it is a renewable resource. Therefore, in today's energy shortage situation, a solar cell is a kind of A new type of energy with broad development prospects. Among many types of solar cells, polycrystalline sil...

Claims

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Application Information

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IPC IPC(8): H01L31/0216H01L31/0224H01L31/0236H01L31/18
CPCH01L31/02167H01L31/022425H01L31/02363H01L31/1804Y02E10/547Y02P70/50
Inventor 何良议宋海诺仇振发汪振华
Owner 浙江利博能源有限公司
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