Method for intensifying light absorption of thin-film solar cell

Abstract

The present invention discloses a method for increasing light absorption of film solar cell. Firstly, depositing glass beards with diameter less than 1 mum on glass substrate to make the surface has fluctuation structure with propriety mum dimension. Then depositing transparent front electrode to make it has surface structure with evident light scattering effect. The film photovoltaic device formed on the transparent front electrode has higher light absorption capacity and conversion efficiency.

Description

technical field [0001] The invention belongs to the field of solar photovoltaic devices, in particular to the manufacturing technology of thin-film silicon-based photovoltaic devices. Background technique [0002] In recent years, the development of photovoltaic cells and large-area photovoltaic modules has attracted widespread attention in the world. Hydrogenated amorphous silicon and nanocrystalline silicon, in particular, have shown great potential with the widespread adoption of photovoltaic devices in commercial and residential installations. A notable feature of producing thin-film silicon photovoltaic devices at such a low temperature below 260°C is that the large-area deposited silicon-related semiconductor film layers and electrical contact film layers have excellent performance. At the same time, using well-established coating equipment and procedures, low-cost stencils can be produced industrially. The laser patterning of different thin films applied on the same...

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Problems solved by technology

[0004] The commonly used front electrode TCO, such as tin oxide, is difficult to make with a high degree of surface texture or roughness when its thickness does not exceed 1000 nm, that is, its ability to scatter light is often unsatisfactory

TCOs with rough surfaces often have poor electrical conductivity and high light loss, which limits the further improvement of the photoelectric efficiency of thin-film photovoltaic devices

There have been various attempts to make the surface texture of TCO more obvious, such as chemically or mechanically treating the deposited TCO film to make the surface rougher, but the roughness obtained by this method is not as good as Very good control and repeatability, which often leads to defects in thin-film photovoltaic devices

Another approach is to increase the thickness of the TCO, so that its surface roughness increases with the thickness, but the thickened TCO increases its absorption of incident light, and also prolongs the production cycle of photovoltaic devices.

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