Natural nanostructures in ionic semiconductors

Toshio Kamiya, Hiromichi Ohta, Hidenori Hiramatsu, Katsuro Hayashi, Kenji Nomura, Satoru Matsuishi, Kazushige Ueda, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalConference articlepeer-review

19 Citations (Scopus)


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 · Al2O3 (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 O2- 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.

Original languageEnglish
Pages (from-to)620-626
Number of pages7
JournalMicroelectronic Engineering
Publication statusPublished - Jan 1 2004
Externally publishedYes
EventMicro and Nano Engineering 2003 - Cambridge, United Kingdom
Duration: Sept 22 2003Sept 25 2003

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering


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