Composite surface light-trapping structure and preparation method thereof

Abstract

The invention discloses a compound curved light trapping structure for improving the efficiency of thin-film silicon solar cells. The whole is composed of periodic unit light trapping structures, each unit is composed of a compound curved surface, and a layer of transparent passivation is covered on the unit light trapping structure. membrane. In addition to the outermost curved surface, there are 3 sets of curved surfaces between each curved surface and the 8 closest similar curved surfaces (two in the x direction form a group, two in the y direction form a group, and 4 in the oblique direction These three groups of surfaces are different from each other, and any two adjacent surfaces are smoothly connected to each other at their lowest points to avoid strong reflections at an angle caused by sharp surfaces. As shown in the figure, the surface marked 1 is a group, the surface marked 2 is a group, the surface marked 3 is a group, and the surface marked 4 is a group, and each group of surfaces has the same period and compound together. The structure proposed by the invention is easy to process, and has the characteristics of large angular spectrum range and high spectral absorption, which is conducive to improving the light absorption efficiency of thin film silicon cells.

Description

technical field [0001] The invention relates to the fields of novel clean energy and micro-nano photons, and in particular relates to a compound curved surface light-trapping structure of a solar cell and a preparation method thereof. Background technique [0002] At present, the dominant photovoltaic cell in the market is crystalline silicon cell. It has the advantages of mature technology, stable performance, and high photoelectric conversion efficiency. The efficiency of commercially produced components has exceeded 19%, and the highest efficiency of cells has reached 25.6%. Although the production cost of batteries has dropped significantly after years of efforts, they still exceed the cost of traditional coal power. In order to further reduce the cost, the battery has been developed to the second generation, namely thin-film silicon battery. [0003] Thin-film silicon solar cells have lower conversion efficiency due to greater light loss. At present, adopting a light...

AI Technical Summary

Problems solved by technology

However, this structure has limitations. First, it can only be applied to monocrystalline silicon cells. Second, it is usually obtained by deep ultraviolet lithography, so the preparation cost is relatively high.

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