Lecture Notes_1-2_Semiconductors_2014

Solids can be divided into three types single

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Unformatted text preview: gap is not too large (~ 1 eV). At room temperature (300 K) the thermal energy is 25.9 meV. Most semiconductors are from Group IV elements in the periodic table, like Si, Ge; or from III- V compound semiconductors, like GaAs, InP, GaN, InGaN; or from II- VI compound semiconductor, like ZnO, CdTe, HgCdTe. We can introduce impurities into a semiconductor to change its conductivity (in Siemens per cm) by many orders of magnitude. On the other hand, we can not change the conductivity of a metal. Solids can be divided into three types: single- crystalline, polycrystalline, and amorphous. Studying single- crystalline materials is easier because we can study only a few atoms in a unit cell, which can generate the single crystal. Electrons traveling in a single- crystalline semiconductor experience less scattering from atoms, so high- performance devices, such as those in a comput...
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This note was uploaded on 04/01/2014 for the course ECE 103 taught by Professor Wang during the Winter '08 term at UCSD.

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