High Efficiency Silicon Solar Cells Fabricated by Catalytic Chemical Vapor Deposition (Cat-CVD) Technology

概要

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This is to demonstrate recent progress of Cat-CVD technology, particularly for application to high efficiency crystalline silicon (c-Si) solar cells. Surface recombination velocity (SRV) of c-Si, which is one of major factors deciding efficiency of solar cells, can be lowered to 1.5 cm/s or less by coating c-Si surface with Cat-CVD silicon-nitride (SiNx)/ amorphous-silicon (a-Si) stacked layers. The value is extremely low compared with ones obtained by other conventional technologies. Phosphorus (P) atoms can be also doped into c-Si at temperatures as low as 80℃ with using species generated by catalytic reaction of P-related gases in Cat-CVD apparatus. Degradation of c-Si quality by heating process, which limits the efficiency of c-Si solar cells, can be avoided by this low temperature doping process. All these facts encourage us to use Cat-CVD technology for fabrication of high efficiency c-Si solar cells.