Flexible cadmium telluride solar cell with graphene insertion layer

Abstract

The invention discloses a flexible cadmium telluride solar cell with a graphene insertion layer. With nickel foil as a substrate and graphene as the insertion layer, the nickel foil and the graphene are arranged on the substrate; and a doped layer and a barrier layer are fabricated behind the insertion layer to form a back contact layer of the flexible cadmium telluride solar cell. Meanwhile, a ZnO-based transparent conductive composite thin film is adopted by a front contact layer; and a copper-free structural design and a copper-free technological treatment process are adopted by the solar cell, so that the photoelectric conversion efficiency of the flexible solar cell can be greatly improved; the long-term stability of a device is improved; and the structural design of the device and the selection of the back contact layer are well compatible to the technological process. In addition, due to the self-support characteristics of the graphene insertion layer, the graphene can be stripped from the metal substrate as an independent transparent cell, and can also be transplanted to a bottom cell to fabricate an efficient laminated cell.

Description

technical field [0001] The invention belongs to the field of new energy materials and devices. Background technique [0002] For more than ten years, many countries in the world are actively developing thin-film solar cells: amorphous silicon solar cells, copper indium (gallium) selenium solar cells, and cadmium telluride solar cells. Compared with crystalline silicon solar cells, it has potential advantages in production and other aspects. Usually the functional layer of thin-film solar cells is only a few microns thick, but glass substrates with a thickness of 1-4 mm are often used. In this way, about 98% of the weight of the entire battery is concentrated on the substrate. If other light-weight substrates are used instead of glass, devices with high specific power (the ratio of output power to device weight) can be obtained. [0003] In terms of space exploration, the most basic requirement for space power is high specific power, which is conducive to the low-cost launc...

AI Technical Summary

Problems solved by technology

For the former, due to the high resistivity, its thickness greatly affects the electrical connection of the battery; for the latter, the high resistivity of MoOx and the rapid diffusion of Cu often cause the degradation of device performance and stability problems

There are also ZnTe or Au / Pd as the insertion layer, but the effect is not ideal, and the rectification effect can still be observed, which may be related to the subsequent high-temperature deposition or treatment process of the insertion layer

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