Physics of Semiconductor Devices

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Exam January 27, 2012

The band structure of a GaN is shown below. The zero of energy is chosen to be the top of the valence band.

(a) Is this a direct or an indirect semiconductor? Why?

(b) What is the Fermi energy for GaN?

(c) What is the band gap?

(d) What are light holes and heavy holes? Explain how you can determine the effective mass of the holes from this diagram.

(e) When is a semiconductor degenerately doped?