Next Generation Crystalline Silicon on Glass Modules

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This project aimed to increase the efficiency of crystalline silicon on glass thin-film solar cells beyond the current world record and to reduce the manufacturing costs by developing new breakthrough approaches to the cell fabrication.Key resultsIt is not possible to produce a high quality solar cell material when the silicon is in direct contact with glass for a number of reasons:Wetting between liquid silicon and glass is poor causing film delamination during melting; impurities from glass diffuse into silicon producing electronic defectsthe reflection from the silicon glass interface is very highthe carrier recombination at the silicon-glass interface is very high too.To solve these problems, an intermediate layer between glass and the silicon is required which possesses the following properties:high thermal stability above silicon melting pointgood wetting of molten siliconlow absorption and high antireflectiongood impurity diffusion barrier, andgood interface passivation.

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