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Method for improving solar cell efficiency and preparing high-efficiency solar cell

A solar cell, high-efficiency technology, applied in the field of solar cells, can solve the problems of hindering the output of photogenerated carriers, damage the recombination center of the lattice, and high production costs, and achieves increased short-circuit current and open-circuit voltage, improved efficiency, and no cost increase. high effect

Inactive Publication Date: 2011-12-14
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Although the production cost of black silicon cones is high, and there are a large number of lattice damage, defects and recombination centers introduced by laser on the surface of the material, which hinder the output of photogenerated carriers, the gain characteristics of black silicon photodetectors are beyond doubt.

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0040] The implementation principle of the present invention will be briefly described below.

[0041] 1. Supersaturated displacement doping under the action of laser

[0042] Ultrafast pulsed laser irradiation is used, that is, the light energy is highly concentrated, and the surface absorption depth is determined according to the wavelength, forming a transient non-equilibrium ultrafast heat treatment process. In this process, high-energy light is enough to break the crystal lattice. And impurity is inserted, thereby forming supersaturated displacement doping, reducing interstitial impurities, increasing the ratio of displacement / interstitial doping, improving the quality of semiconductor junctions, reducing saturation ...

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Abstract

The invention discloses a method for improving the efficiency of a solar cell. The method is to irradiate the doped region of the solar cell with a pulsed laser, so that the impurities in the doped region form supersaturated replacement doping and are activated to reduce the gap The amount of doping can improve the quality of the semiconductor junction, reduce the recombination of carriers, increase the short-circuit current and open-circuit voltage, and finally achieve the purpose of improving the efficiency of solar cells.

Description

technical field [0001] The present invention relates to the technical field of solar cells, in particular to a method for improving the efficiency of solar cells, and a method for preparing high-efficiency solar cells based on the method. The solar cells include but are not limited to crystalline silicon, polycrystalline silicon, microcrystalline silicon, nanocrystalline Solar cells such as silicon, amorphous silicon, copper indium gallium selenide, cadmium sulfide or gallium arsenide. Background technique [0002] Silicon solar cells are currently the most productive and widely used products. The highest laboratory record of photovoltaic efficiency of crystalline silicon solar cells has reached 24.7%, while the commercial level of photovoltaic efficiency is only 18%, and the photovoltaic efficiency of polycrystalline silicon solar cells is only 16%. , people are constantly working to improve the process and increase the photovoltaic efficiency of the cell to reduce the gap ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18B23K26/00
CPCY02P70/50
Inventor 韩培德邢宇鹏范玉杰梁鹏
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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