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Preparation method for solar cell and solar cell prepared by same

A technology of solar cells and silicon wafers, which is applied to circuits, photovoltaic power generation, electrical components, etc., can solve the problems of low photoelectric conversion efficiency of solar cells and the development of solar cells with low photoelectric conversion rates, and achieves easy industrial production, good effect, and method simple effect

Inactive Publication Date: 2016-05-04
FOSHAN JUCHENG BIOCHEM TECH RES & DEV CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The photoelectric conversion efficiency of existing solar cells is low, only about 12%, and the low photoelectric conversion rate has always been the bottleneck restricting the development of solar cells

Method used

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preparation example Construction

[0025] The invention provides a method for preparing a solar cell. The method comprises: putting a boron-doped silicon wafer into a solution of rare earth halides and performing an impregnation reaction at a temperature of 150-300 degrees Celsius for 12-120 hours in an airtight environment to obtain silicon doped with boron and rare earths. The silicon wafer doped with boron and rare earth is subjected to phosphorous diffusion to obtain a PN junction silicon wafer doped with rare earth; the solar cell is formed by combining the PN junction silicon wafer doped with rare earth with a positive electrode and a negative electrode.

[0026] The photoelectric conversion efficiency, that is, the incident monochromatic photon-electron conversion efficiency, is defined as the ratio of the number Ne of electrons generated in the external circuit per unit time to the number Np of incident monochromatic photons per unit time. The performance of the solar cell is mainly determined by the pho...

Embodiment 1

[0036] According to the mass ratio of 1:0.5, put the boron-doped silicon chip into the solution of lanthanum chloride with a mass fraction of 1%, and carry out the impregnation reaction at 150 degrees Celsius for 12 hours in a closed reaction kettle to obtain boron-doped rare earth silicon slice; the silicon slice doped with boron and rare earth is carried out phosphorus diffusion at 650 degrees Celsius for 1 hour to obtain a PN junction silicon slice doped with rare earth; the positive electrode and silver electrode of the PN junction silicon slice doped with rare earth are connected The negative electrode constitutes the back contact solar cell 1, and the photoelectric conversion efficiency of the solar cell 1 is 16%.

Embodiment 2

[0038]According to the mass ratio of 1:10, put the boron-doped silicon chip into the solution of cerium chloride with a mass fraction of 5%, and carry out the impregnation reaction at 300 degrees Celsius for 120 hours in a closed reaction kettle to obtain boron-doped rare earth silicon slice; the boron-doped and rare earth-doped silicon slice was subjected to phosphorus diffusion at 850 degrees Celsius for 12 hours to obtain a rare-earth-doped PN junction silicon slice; The negative electrode constitutes the back contact solar cell 2, and the photoelectric conversion efficiency of the solar cell 2 is 21%.

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Abstract

The invention relates to a preparation method for a solar cell and the solar cell prepared by the same. The preparation method comprises the steps of putting a boron-doped silicon wafer into 1-5mass% of a halogenated rare earth solution at a mass ratio of 1:(0.5-10); performing an impregnation reaction in a closed reaction kettle at a temperature of 150-300 DEG C for 12-120h to obtain a silicon wafer doped with boron and rare earth; performing phosphorous diffusion on the silicon wafer doped with boron and rare earth at a temperature of 650-850 DEG C for 1-12h to obtain a rare-earth-doped PN junction silicon wafer; and enabling the rare-earth-doped PN junction silicon wafer, a positive electrode of a silver electrode and a negative electrode of the silver electrode to form a back-contact solar cell. The photoelectric conversion efficiency of the solar cell is 14-24%.

Description

technical field [0001] The invention relates to a method for preparing a battery, in particular to a method for preparing a solar cell and a solar cell prepared by the method. Background technique [0002] With the advent of the new century, the global economy is developing rapidly, human demand for energy continues to increase, and the extensive use of fossil fuels has led to a rapid shortage of energy and increasing environmental pollution. The world is facing a serious fact: energy The problem has become a hot spot and a difficult point in economic development. At present, the shortage of traditional energy sources and environmental pollution have become the main problems restricting economic development, and it is becoming more and more urgent to find non-polluting energy sources. Solar energy is a kind of energy produced by hydrogen nuclear fusion reaction, and the energy is quite huge. The energy irradiated on the earth every second can be equivalent to the heat gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/0288
CPCH01L31/0288H01L31/1804Y02E10/547Y02P70/50
Inventor 不公告发明人
Owner FOSHAN JUCHENG BIOCHEM TECH RES & DEV CO LTD
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