Abstract
Nanostructures naturally formed in oxide semiconductor crystals are discussed in relation to their electronic structure and properties. Three different crystals are studied: (i) layered oxychalcogenides LnCuOCh (Ln=lanthanide, Ch=chalcogen), (ii) homologous series layered oxides RMO 3 (ZnO) m (R=In, Lu etc., M=In, Ga etc., m =integer), and (iii) nanoporous crystal 12CaO7 · Al 2 O 3 (C12A7). Coexistence of moderately large mobility, intense photoluminescence arising from room-temperature exciton and high-density hole is explained by a natural modulation doping structure in LnCuOCh. C12A7 exhibits different properties by replacing free O 2− ions anions clathrated in its subnanometer-sized cages with O − , H − , and electron. The electronic structures of the clathrated anions were investigated by ab initio calculations and discussed in terms of possible quantum structures and applications.
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