The mechanism responsible for a drastic change of the conductivity following hydrogen annealing and UV irradiation in a transparent oxide, 12CaO.7Al2O3, was investigated. It was observed that the charge transport associated with photoexcitation of an electron from H - occurs by electron hopping. The atoms participating in the hops determined the exact paths for the carrier migration and predicted a way to enhance the conductivity by specific doping. The results show that the proton implantation resulted in the appearance of new unoccupied states in the band-gap making H+ one of the hopping centers a conductivity channel and so enhance the transport.
ASJC Scopus subject areas
- Physics and Astronomy(all)