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(2πm*kbt/h^2)^2/3
where m*=effective mass
m*e=0.02me, m*h=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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