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. [Nature (London) 419, 462 (2002).] The charge transport associated with photoexcitation 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.
J. E. Medvedeva et al., "Electronic Structure and Light-Induced Conductivity of a Transparent Refractory Oxide," Physical Review Letters, vol. 93, no. 1, pp. 016408-1-016408-4, American Physical Society (APS), Jul 2004.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.93.016408
Keywords and Phrases
Annealing; Carbon Nanotubes; Charge Transfer; Crystallography; Doping (Additives); Electric Conductivity; Electronic Structure; Energy Gap; Hydrogen; Ion Implantation; Sintering; Ultraviolet Radiation; Band Gap; Electron Trapping; Hopping; Photoexcitation; Calcium Compounds
International Standard Serial Number (ISSN)
Article - Journal
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