Physics, 11.10.2019 20:30, jalenJohnson6t

1. an energy gap of a semiconductor has its fermi level just above valence band of 0.2ev and the energy gap is 1.5ev
a) deduce the type of majority carriers
b) calculate the probability of a hole occupying a state at the top of valence band.

2. effective number of states per unit volume in valence and conduction bands is
n=2(2πmkbt/h^2)^2/3
where m=effective mass
me=0.02me, mh=0.05me
i) calculate density of state in valence at room temperature
ii) deduce the concentration of holes in valence at room temperature
note* b and e are subscripts

Answers: 2

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1. an energy gap of a semiconductor has its fermi level just above valence band of 0.2ev and the ene...