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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Poole–Frenkel effect ： ウィキペディア英語版 Poole–Frenkel effect In solid-state physics, the Poole–Frenkel effect (also known as Frenkel-Poole emission〔Sze, ''Physics of Semiconductor Devices'', 2nd edition, Section 7.3.4.〕) is a means by which an electrical insulator can conduct electricity. It is named after Yakov Frenkel, who published on it in 1938,〔J. Frenkel, "On pre-breakdown phenomena in insulators and electronic semi-conductors", Phys. Rev., vol. 54, pp. 647-648, 1938. In this paper published in USA, Frenkel only very briefly mentioned an empirical relationship as Poole's law. Frenkel cited Poole's paper when he wrote a longer article in a Soviet journal. (Note: Yakov Frenkel quite frequently put down his name as J. Frenkel when he published his papers in journals using the English language.)〕 and also after H. H. Poole (Horace Hewitt Poole, 1886-1962), Ireland. Electrons can move (slowly) through an insulator by the following method. The electrons are generally trapped in localized states (loosely speaking, they are "stuck" to a single atom, and not free to move around the crystal). Occasionally, random thermal fluctuations will give that electron enough energy to get out of its localized state, and move to the conduction band. Once there, the electron can move through the crystal, for a brief amount of time, before relaxing into another localized state (in other words, "sticking" to a different atom). The Poole–Frenkel effect describes how, in a large electric field, the electron doesn't need as much thermal energy to get into the conduction band (because part of this energy comes from being pulled by the electric field), so it does not need as large a thermal fluctuation and will be able to move more frequently. Taking everything into account (both the frequency with which electrons get excited into the conduction band, and their motion once they're there), the standard quantitative expression for the Poole–Frenkel effect is:〔〔Rottländer et al., Phys. Rev. B 65, 054422 (2002)〕 :$J\; \backslash propto\; E\; \backslash exp\; \backslash left\; (\; \backslash frac\; \backslash right\; )$ where: :''J'' is the current density :''E'' is the applied electric field :''q'' is the elementary charge :$\backslash phi\_B$ is the voltage barrier (in zero applied electric field) that an electron must cross to move from one atom to another in the crystal :$\backslash epsilon$ is the dynamic permittivity :$k\_B$ is Boltzmann's constant :''T'' is the temperature. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Poole–Frenkel effect」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.