Electronic structure and light-induced conductivity in a transparent refractory oxide

A.J. Freeman; J.E. Medvedeva; M.I. Bertoni; T.O. Mason

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Electronic structure and light-induced conductivity in a transparent refractory oxide

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arxiv cond-mat/0402218 v1 pith:MQNIXF3T submitted 2004-02-09 cond-mat.mtrl-sci

J.E. Medvedeva , A.J. Freeman , M.I. Bertoni , T.O. Mason This is my paper

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keywords conductivityelectronhoppingoxidetransparenttransportal2o3annealing

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Combined first-principles and experimental investigations reveal the underlying mechanism responsible for a drastic change of the conductivity (by 10 orders of magnitude) following hydrogen annealing and UV-irradiation in a transparent oxide, 12CaO.7Al2O3, found by Hayashi et al. The charge transport associated with photo-excitation of an electron from H, occurs by electron hopping. We identify the atoms participating in the hops, determine the exact paths for the carrier migration, estimate the temperature behavior of the hopping transport and predict a way to enhance the conductivity by specific doping.

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