Matlab电子电路分析（第三卷）

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Matlab电子电路分析（第三卷）

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4 P; ?6 X- o8 e& e) U6 ~5 EIn 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
ductors are discussed. The characteristics of depletion and diffusion capaci[size=9.96001pt]tance are explored through the use of example problems solved with
MATLAB. The effect of doping concentration on the breakdown voltage of[size=9.96001pt]pn junctions is examined.
10.1 INTRINSIC SEMICONDUCTORS
: p! s% _/ d# A2 e2 }5 e0 L10.1.1 Energy bands
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. Electrons
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
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
a direct band gap semiconductor.
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
band (conduction band) is completely empty. The valence and conduction[size=9.96001pt]bands are separated by a forbidden energy gap.
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