Field-induced current modulation in nanoporous semiconductor, electron-doped 12CaO·7Al2O3

Toshio Kamiya, Shouzou Aiba, Masashi Miyakawa, Kenji Nomura, Satoru Matsuishi, Katsuro Hayashi, Kazushige Ueda, Masahiro Hirano, Hideo Hosono

研究成果: Contribution to journalArticle査読

40 被引用数 (Scopus)

抄録

12CaO·Al2O3 (C12A7) has a unique crystal structure composed of positively charged cages ∼0.4 nm in inner diameter and a free oxygen ion (O2-) clathrated in one-sixth of the cages. C12A7 can be converted to inorganic electride by replacing the clathrated oxygen ions with electrons, and the electride exhibits degenerate-type conduction with room-temperature conductivities >100 S cm-1. In intermediate states, semiconductive C12A7 can be obtained by controlling electron density. In this study, we examined effects of electric field on carrier transport properties of the semiconductive C12A7 using a field-effect transistor (FET) structure targeted for future mesoscopic devices and electrochemical devices that will utilize the quantum-dot-like cage structures and chemically active clathrated anions in C12A7. FETs were fabricated using two types of samples, (i) single-crystalline bulk and (ii) polycrystalline thin films, for channels. First, conditions to form good contacts for source and drain electrodes were examined because the semiconductive C12A7 has a small work function, and it was difficult to form good electrical contacts with metals. It was found that Pt was the best metal with the lowest contact resistance to C12A7, and thermal annealing at ≥300 °C improved its non-ohmic characteristics. Electrical conductivity was modulated by 1-2 orders of magnitude by applying gate voltage. Apparent field-effect mobilities were 0.02-0.08 cm2 (V s) -1, which were comparable with the drift mobilities of the semiconductive C12A7. This is the first demonstration of a semiconductor device using an electride.

本文言語英語
ページ(範囲)6311-6316
ページ数6
ジャーナルChemistry of Materials
17
25
DOI
出版ステータス出版済み - 12 13 2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料化学
  • 材料科学(全般)

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