Thin film fabrication of nano-porous 12CaO·7Al2O 3 crystal and its conversion into transparent conductive films by light illumination

Yoshitake Toda, Masashi Miyakawa, Katsuro Hayashi, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalConference article

39 Citations (Scopus)

Abstract

Thin film fabrication of crystalline 12CaO·7Al2O 3 (C12A7) with zeolitic structure was examined, and their electrical and optical properties were measured. Polycrystalline thin films were prepared by post-annealing of amorphous films in oxygen atmosphere at temperatures above 800 °C. Choice of substrates was crucial for obtaining single-phase thin films. Although various oxide substrates (single crystals of Al 2O3, Y-stabilized ZrO2, MgO and silica glass) were examined, single-phase films were obtained only for MgO substrates and the other substrates reacted with the CaO component in the films during post-annealing. The optical band gap of C12A7 was evaluated to be 5.9 eV. Hydride ions were incorporated into the film by a thermal treatment in a hydrogen atmosphere at 1200 °C. The resulting transparent thin films were converted into transparent persistent electronic conductors exhibiting an electrical conductivity 6.2×10-1 Scm-1 at 300 K by ultraviolet light illumination. This is the first example of transparent conductive thin film in which conductive areas can be patterned directly by light.

Original languageEnglish
Pages (from-to)309-312
Number of pages4
JournalThin Solid Films
Volume445
Issue number2
DOIs
Publication statusPublished - Dec 15 2003
Externally publishedYes
EventProceedings of the 3rd International Symposium on Transparent Oxide - Tokyo, Japan
Duration: Apr 10 2003Apr 11 2003

Fingerprint

Conductive films
Lighting
illumination
Fabrication
Thin films
Crystals
fabrication
thin films
crystals
Substrates
Annealing
Crystalline materials
atmospheres
annealing
Optical band gaps
silica glass
Amorphous films
Fused silica
Hydrides
ultraviolet radiation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Thin film fabrication of nano-porous 12CaO·7Al2O 3 crystal and its conversion into transparent conductive films by light illumination. / Toda, Yoshitake; Miyakawa, Masashi; Hayashi, Katsuro; Kamiya, Toshio; Hirano, Masahiro; Hosono, Hideo.

In: Thin Solid Films, Vol. 445, No. 2, 15.12.2003, p. 309-312.

Research output: Contribution to journalConference article

Toda, Yoshitake ; Miyakawa, Masashi ; Hayashi, Katsuro ; Kamiya, Toshio ; Hirano, Masahiro ; Hosono, Hideo. / Thin film fabrication of nano-porous 12CaO·7Al2O 3 crystal and its conversion into transparent conductive films by light illumination. In: Thin Solid Films. 2003 ; Vol. 445, No. 2. pp. 309-312.
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AU - Hirano, Masahiro

AU - Hosono, Hideo

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