Express letter: Novel room temperature stable electride 12SrO・7Al2O3 thin films: fabrication, optical and electron transport properties

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  • MIYAKAWA Masashi
    Frontier Collaborative Research Center, Tokyo Institute of Technology
  • UEDA Naoto
    Materials and Structures Laboratory, Tokyo Institute of Technology
  • KAMIYA Toshio
    Materials and Structures Laboratory, Tokyo Institute of Technology
  • HIRANO Masahiro
    Frontier Collaborative Research Center, Tokyo Institute of Technology
  • HOSONO Hideo
    Frontier Collaborative Research Center, Tokyo Institute of Technology Materials and Structures Laboratory, Tokyo Institute of Technology

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  • Novel Room Temperature Stable Electride 12SrO 7Al2O3 Thin Films: Fabrication, Optical and Electron Transport Properties

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12SrO•7Al2O3 (S12A7) is a meta-stable phase in the system of SrO-Al2O3 and has the isostructure with 12CaO•7Al2O3 (C12A7), which is composed of sub-nanometer-sized cages with oxygen ions loosely encaged in the cages. This letter reports fabrication of polycrystalline thin films of insulating and metallic S12A7 electride thin films. The as-crystallized film was an electrical insulator, while light-induced persistent electronic conduction with a conductivity of~1×10-3 S•cm-1 at 300 K was realized in proton-implanted films. Higher conductivities of~270 S•cm-1 were attained in the films subjected to a reduction treatment using an oxygen deficient amorphous film deposition. These behaviors are similar to those observed on C12A7. The present results suggest that S12A7 is another candidate material to explore electronic functions originating from a nanoporous structure embedded in a crystal structure.<br>

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