Photoinduced generation of electron anions in H-doped nanoporous oxide 12CaO·7Al2O3: Toward an optically controlled formation of electrides

Sushko, Peter V.; Shluger, Alexander L.; Hayashi, Katsuro; Hirano, Masahiro; Hosono, Hideo
February 2005
Applied Physics Letters;2/28/2005, Vol. 86 Issue 9, p092101
Academic Journal
We suggest, on the basis of detailed ab initio calculations of both ground and photoexcited states of H-doped 12CaO·7Al2O3 (C12A7:H), that stable high-conductivity regions can be optically generated in this insulating system. Each H- ion in C12A7:H can, under photoirradiation at 3.8–4.5 eV, produce up to two electrons and a proton that binds to the lattice network and forms OH-. Mobile electrons play a role of anions in this system. They move over subnanosized cages of the C12A7 lattice via polaron hopping. The insulating state is reversibly restored upon heating to 300 °C.


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