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The Origin of Persistent Photoconductivity in Hydrogenated Amorphous Silicon

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The origin of the persistent photoconductivity (PPC) in hydrogenated amorphous silicon, specifically doping-modulated npnp… type superlattices and unlayered, compensated films has been reexamined. Previous models with AX centers, dangling bonds and P-B complexes as well as very recent proposals by Kakalios and by Fritzsche et al. are compared with respect to our very recent experimental results. The result of analyses lead to the conclusion that hole induced dopant conversion and following dangling bond formation processes are responsible for PPC in both doping-modulated superlattices and compensated films.

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