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Matlab电子电路分析（第三卷） # ^. `# A( e. a- L" [
CHAPTER TEN
& P7 a& W" K# M( d+ ?& jSEMICONDUCTOR PHYSICS
k$ G1 d2 k" Q8 ~4 ]In this chapter, a brief description of the basic concepts governing the flow of [size=9.96001pt]current in a pn junction are discussed. Both intrinsic and extrinsic semicon
2 }6 T. A& j9 Q0 P) Lductors are discussed. The characteristics of depletion and diffusion capaci[size=9.96001pt]tance are explored through the use of example problems solved with8 e" L4 J4 A% ?& d* a8 J2 i
MATLAB. The effect of doping concentration on the breakdown voltage of[size=9.96001pt]pn junctions is examined., _+ Y8 d1 |+ N- n; W. L( y
10.1 INTRINSIC SEMICONDUCTORS 9 O0 _1 u: M3 d( q5 q3 o, U" s: e
10.1.1 Energy bands2 L/ i1 p* w/ a; A H9 N3 M
According to the planetary model of an isolated atom, the nucleus that con[size=9.96001pt]tains protons and neutrons constitutes most of the mass of the atom. Electrons8 u* e3 G6 g; b- Y
surround the nucleus in specific orbits. The electrons are negatively charged[size=9.96001pt]and the nucleus is positively charged. If an electron absorbs energy (in the- m3 K- o4 t9 B' }7 F+ Z
form of a photon), it moves to orbits further from the nucleus. An electron[size=9.96001pt]transition from a higher energy orbit to a lower energy orbit emits a photon for; J) m( D ?: f6 K
a direct band gap semiconductor. 6 U# c3 {$ G% @* `
The energy levels of the outer electrons form energy bands. In insulators, the[size=9.96001pt]lower energy band (valence band) is completely filled and the next energy
3 m( ~, C- E8 T! ]8 w& e- [: z1 E4 rband (conduction band) is completely empty. The valence and conduction[size=9.96001pt]bands are separated by a forbidden energy gap. / O" G$ {" {5 r, s) V4 f
4 Z H: d, U7 h7 |' l[size=9.96001pt]4 ?; G% A3 g/ G; h( @9 i
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发表于 2020-5-19 10:40
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