Chap12 - 1 4 2(a(b(c 3 4 5(a(b(c 6 p-n 7

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第第第第 第第第第 一一一一一一 一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一 一一一一一一一一一一一一一一一一一 一一一一一一一一一 1一一一一一一一一 4 一一一一一一一一一一一 2一一一一一一一一一一一一一一一一一一一一一一(a)一一一(b)一一一一一一一一一一一一一(c) 一一一一 3一一一一一一一一一一一一一一一一 一一一一一一一一(一一一一一一一)一一一一一一一一一一 4一一一一一一一一一一一一一一一一一一一一 5一一一一一一一一一一一一一一一一一一一(a)一一一(b)一一一一(c)一一一一 6一一一 p-n 一一一一一一一一一一一一一一一一一一一一 一 7一一一一一一一一一一一一一 8一一一一一一一一一一一一一一 9一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一 10一一一一一一一一一一一一一一 一一一一一一一一一 Acceptor state: 第第第 When impurity atoms with a valence of 3 is added as a substitutional impurity into silicon crystal, one of the covalent bonds around each of these atoms is deficient in an electron; such a deficiency may be viewed as a hole that is weakly bound to the impurity atom. Each impurity atom of this type introduces an energy level within the band gap, above yet very close to the top of the valence band which is termed acceptor state. 第第第 3 第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第第 第第第第第第第第第第第第第第第第第 Conduction band: 第第 In band structures, one band that is empty with electrons is termed conduction band. 第第第第第第第第第第第第第第第第第第第 Conductivity, electrical第第第第 Electrical conductivity σ is the reciprocal of the resistivity, or σ=1/ρ and is indicative of the ease with which a material is capable of conducting an electric current. 第第第 σ 第第第第第第第第第第 σ=1/ρ第第第第第第第第第第第第第第第
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This note was uploaded on 10/15/2011 for the course ENG 302 taught by Professor Haitaowang during the Winter '10 term at Tsinghua University.

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Chap12 - 1 4 2(a(b(c 3 4 5(a(b(c 6 p-n 7

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