Window layer, CdTe thin-film solar cell assembly and preparation method of CdTe thin-film solar cell assembly

Abstract

The invention discloses a window layer, a CdTe thin-film solar cell assembly and a preparation method of the CdTe thin-film solar cell assembly. The window layer is a Mg<x>Cd<1-x>S<y>O<1-y> layer, wherein x is smaller than 1 and greater than 0 and y is smaller than 1 and greater than 0; the solar cell assembly comprises a substrate, wherein the substrate is provided with an epitaxial stack layer;the epitaxial stack layer sequentially comprises a transparent conductive film layer, the window layer, a light absorption layer, a back contact layer and a back electrode layer from bottom to top; and the window layer and the window layer in the CdTe thin-film solar cell assembly are MgO-doped CdS layers, the transparency of the window layers is improved and the intensity of the sunlight irradiating the absorption layer is increased, so that recombination of charge carriers on an interface between the window layer and the absorption layer is reduced; and the CdTe thin-film solar cell assemblyof using the window layer is high in short-circuit current, open-circuit voltage, filling factor and conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a window layer, a CdTe thin film solar cell component and a preparation method thereof. Background technique [0002] With the gradual depletion of fossil fuels and the increasingly serious environmental pollution caused by the burning of fossil fuels, the promotion and application of new energy has become a global consensus. Solar energy, as the most important renewable energy in new energy, occupies an important position in the future development. Thin-film solar cells mainly include amorphous silicon, CdTe, copper indium gallium selenide and dye-sensitized and other types. Due to the low consumption of materials, there is a consensus that there is a large space for cost reduction. focus on. [0003] Among them, the current CdTe thin film solar cell module uses the CdS layer as the window layer. The CdS material has a small band gap of 2.4eV, so the window layer absorbs p...

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Problems solved by technology

[0003] Among them, the current CdTe thin film solar cell module uses the CdS layer as the window layer. The CdS material has a small band gap of 2.4eV, so the window layer absorbs part of the visible light before the absorber layer CdTe layer, reducing the incident sunlight intensity on the absorber layer. , to reduce the short-circuit current of battery components and affect the conversion efficiency

In addition, there is a difference in the energy band structure of the CdTe layer and the CdS layer. During the process of electron transmission from the CdTe layer to the CdS layer, there will be a certain surface recombination at the interface between the CdTe layer and the CdS layer, which will affect the open circuit voltage and fill factor of the battery module. , thereby affecting the conversion efficiency

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