Amorphous silicon membrane solar battery with gradually-changed germanium component intrinsic layer and preparation method of amorphous silicon membrane solar battery

Abstract

The invention discloses an amorphous silicon membrane solar battery with a gradually-changed germanium component intrinsic layer and a preparation method of the amorphous silicon membrane solar battery. The amorphous silicon membrane solar battery comprises a silicon nitride membrane, a glass layer 4, a transparent conductive film, a P-type heavily-doped microcrystal Si membrane, P-type lightly-doped hydrogenated amorphous silicon, an intrinsic hydrogenated amorphous silicon germanium membrane, a n-type hydrogenated amorphous silicon membrane, a transparent conductive membrane on the back and an aluminum substrate from bottom to top in sequence, wherein a positive electrode is arranged on the silicon nitride membrane and a negative electrode is arranged at the lower end of the aluminum substrate. The double-layer silicon nitride (SiN) structure is added, so that the antireflection effects are improved, and therefore, the absorption of incident light by the solar battery is strengthened, and the photovoltaic conversion efficiency of the solar battery is improved in a facilitated manner. The intrinsic layer is made from a hydrogenated amorphous silicon germanium material, so that the spectral response range is expanded and the absorption of sunlight by the battery is increased, and therefore, the photovoltaic conversion efficiency of the solar battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an amorphous silicon thin-film solar battery with a graded germanium component intrinsic layer and a preparation method thereof. Background technique [0002] With the rapid development of the economy, people's demand for energy is also increasing. The conventional energy used in modern society, such as coal, oil and natural gas, not only has limited reserves but also uneven distribution in nature, and there are serious environmental pollution problems. , the resource carrier of this economy will approach estimates in the middle of the 21st century, and the energy crisis will occur sooner or later, so the use of renewable energy, especially solar energy, is an effective way to solve the problem, among which solar cells developed using the photovoltaic effect are getting more and more With a lot of research and application, the full development and utilization of solar energy ha...

AI Technical Summary

Problems solved by technology

[0004] The solar cells in the first stage are represented by monocrystalline silicon and polycrystalline silicon solar cells, which have high conversion efficiency and currently occupy a major market share. However, there are problems of high energy consumption and high cost at the same time, making it difficult to compete with traditional energy sources.

[0005] The solar cells in the second stage are thin-film solar cells. Thin-film solar cells that have been successfully developed include: silicon-based thin-film batteries, copper indium gallium selenium series thin-film batteries, cadmium telluride series thin-film batteries, etc., among which silicon-based thin-film solar cells have cost It has become one of the most researched and fastest-growing photovoltaic cells in the world. However, the conversion efficiency of silicon-based thin-film solar cells is relatively low. , therefore, increasing the light absorption and improving the conversion efficiency of the cell is an urgent problem to be solved

However, due to the surprise of the refractive index of glass and air, there is still about 8% reflection of visible light

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