Band edge disorder producing Urbach's tail and enhanced photochromic efficiency caused by density of states inside band gap in tungsten oxide films

Takaya Kubo*, Yoshinori Nishikitani, Nobuyuki Kuroda, Mitsuo Matsuno

*この研究の対応する著者

研究成果査読

8 被引用数 (Scopus)

抄録

The band gap of WO3 and its disorder at the band edge were evaluated, assuming Urbach's rule, and flat-band potentials (Vfbs) were also measured on WO3 films with high photochromic efficiency (HPE) and low photochromic efficiency (LPE). The main results are as follows: 1) the optical absorption of LPE-WO3 sets on at higher photon energy than that of HPE-WO3, 2) HPE-WO3 has the density of states deeper in the band gap than LPE-WO3 does, and 3) Vfb of HPE-WO3 is higher than that of HPE-WO3. These results indicate that the band edge disorder of WO3, which is closely related to Urbach's tail, determines the Fermi level position, and therefore makes Vfb high; they also imply that a high Vfb, dissociates optically excited electrons and holes to make colors center resulting in photochromism at a high efficiency.

本文言語English
ページ(範囲)5361-5366
ページ数6
ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
35
10
出版ステータスPublished - 1996
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)
  • 工学(全般)

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