Semiconductor+Discussion+answers

Semiconductor+Discussion+answers - Discussion session...

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Discussion session questions: Circle the correct answer: Silicon and germanium are examples of semiconductors with the diamond cubic crystal structure. In silicon, each Si atom is covalently bonded to 4 Si atoms. InSb and GaAs are examples of semiconductors with the zinc blende crystal structure. In GaAs, each Ga atom is bonded to 4 As atoms. Dopants are intentional impurities which are added to control the conductivity of the semiconductor to a desired level. In silicon and germanium, if we desire a p -type semiconductor, we choose to add an element from group III of the periodic table. The majority carrier is a hole. If instead we desire an n -type semiconductor, we choose to add an element from group V of the periodic table. The majority carrier is an electron. In GaAs, if we desire a p -type semiconductor, possible doping schemes involve: (a) substituting a group II element such as Cd for Ga (b) substituting a group IV element such as Ge for Ga (c) substituting a group IV element such as Ge for As
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This document was uploaded on 10/27/2011 for the course EMS 172 at UC Davis.

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Semiconductor+Discussion+answers - Discussion session...

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