Transport and recombination in amorphousphyphen;ihyphen;nhyphen;type solar cells studied by electrically detected magnetic resonance

摘要

A detailed study of electrically detected magnetic resonance inphyphen;ihyphen;nhyphen;type solar cells made from amorphous silicon is reported. It is found that the spectra depend sensitively on the applied voltage, and the intensity and photon energy of the light. The results support the present understanding of the mechanism of the device. It is shown that in general, the transport in the dark, and the charge collection under illumination, are controlled by recombination in the bulk of theilayer. Only when a high forward bias is applied and under illumination does recombination at thephyphen;iinterface play an important role. Degradation by both current and illumination results predominantly in an enhancement of the recombination rate in theilayer.