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Cadmium-Te solar battery with ultra-thin graphite slice as underlay

A technology of thin-film solar cells and graphite sheets, which can be used in circuits, photovoltaic power generation, electrical components, etc., and can solve problems such as the inability to achieve heavy doping of cadmium telluride

Inactive Publication Date: 2008-09-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heavy doping of CdTe cannot be achieved due to the self-compensation effect

Method used

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Embodiment Construction

[0013] Embodiment: On an ultra-thin graphite sheet with a thickness of 50-500 microns, a layer of copper film with a thickness of 50-200 nanometers is prepared by sputtering technology, and then treated at 200-300° C. for 20-40 minutes. The copper-doped ultra-thin graphite sheet is used as a substrate to deposit a layer of tellurium with a thickness of 20-100 nanometers, and the preparation technology is sputtering or vacuum evaporation. Then use vacuum evaporation, near-space sublimation or magnetron sputtering to deposit a layer of cadmium telluride film with a thickness of 1-5 microns. Then anneal the cadmium telluride thin film under the following conditions: normal pressure, 360-450°C, 30-90 minutes. The annealing atmosphere is "dry air + 1%-10% HCl or Freon". Then plasma etching is used to remove a thin layer about 100-200 nanometers thick on the surface of the cadmium telluride film. A layer of CdS thin film is deposited on the surface of the cadmium telluride thin fi...

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Abstract

The invention relates to a CdTe solar cell which has a substrate of ultra-thin flake graphite,belonging to the field of new energy material and device. The invention uses flexible ultra-thin flake graphite as the substrate material, and sputters a layer of copper on the flake graphite, then carries heat treatment. The copper diffuses into graphite forming copper-doped flake graphite. The invention deposits a layer of tellurium on the copper-doped fake graphite, then deposits the CdTe and carries annealing treatment. In the process of deposition and annealing treatment of CdTe, heavily doped CuxTe layer is formed between flake graphite and CdTe, thus realizing ohmic contact between flexible ultra-thin graphite substrate and CdTe. And the invention deposits CdS, transparent conductive film and grid pattern aluminum electrode in turn to obtain flexible CdTe film solar cell. The invention solves the contradiction which is between high processing temperature required by preparing high efficient flexible CdTe and low tolerance temperature of conventional flexible substrate.

Description

1. Technical field [0001] The field of the present invention is the field of new energy materials and devices. 2. Background technology [0002] Although the mass production efficiency of traditional bulk silicon solar cells reaches 15%-17%, only rigid substrate components can be prepared, thus limiting its application range. Thin-film solar cells can be prepared not only as rigid substrate components, but also as deformable flexible components using flexible materials as substrates. The flexible thin-film solar cell module has the characteristics of light weight, foldable and curling, and can be attached to a special-shaped surface for use. In the fields of portable energy, building-integrated energy, and energy for large space vehicles that stay in the air for a long time, flexible thin-film solar cell modules have outstanding application advantages. [0003] However, the preparation of flexible cadmium telluride thin film solar cells has the following difficulties: (1) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/045H01L31/02
CPCY02E10/50
Inventor 张静全雷智冯良桓蔡亚平武莉莉李卫黎兵郑家贵
Owner SICHUAN UNIV
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