전기전자재료 중간고사 솔루션

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Part I: True/False (2 points each)
You do not need to explain your answers.
(T / F) 1. A “Wigner-Seitz cell” is a unique primitive cell for a given crystal lattice.
(T / F) 2. The intrinsic concentration, ni, is both dependent on the band gap energy level and temperature.
(T / F) 3. Even if we dope a semiconductor and it becomes extrinsic, the relation n = p = ni still holds true because of mass action law.
(T / F) 4. An ohmic contact can only be formed when the metal work function is less than the semiconductor work function for a p-type semiconductor.
(T / F) 5. Silicon is an ideal material for solar cell and LED applications due to its cheap cost.
(T / F) 6. Materials such as Si and Ge are desirable for electrical device applications due to the fast mobility of electrons in these materials.
(T / F) 7. All other things considered equal, the energy bandgap is generally larger in semiconductors made from large atoms that are spaced far apart.

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