Question

i. l e blank(s). A gap suggest two-word in your answer Drift current in semiconductors is due to electric [20] tield. Carriers in the band are referred to as statistics is applied to electrons in The semiconductors. The position and principle states that we cannot simultaneously determine the of electrons. Vy is a . while w is a number and Current in the conduction is due to the flow of Extrinsic semiconductors are vii. viii. The wave function in Schrodinger's equation is associated with The Valence band in semiconductor is the Fermi level. ix. X. The unit for density of states in the conduction band is 3b: True or false (circle the right answer, no hints provided) [20] 1. Both silicon and GaAs are compound semiconductors T/F. 2. Semiconductors with the same band gap have similar electron population in the conduction band. CO/F. 3. Maxwell and Boltzmann distribution function is applied to semiconductor analysis. T . 4. To find carriers in the conduction band of metals, we need (a) carrier density and the (b) Fermi Function T/F. 5. The unit for density of state functions (Na, Nc) are number of states/area. TF 6. Fermi Dirac probability function describes the statistical distribution of electrons among available energy states T/F 7. Fermi-Dirac probability can be approximated by a simple exponential function. T/F. 8. An entire two dimensional lattice can be constructed by the translation of a unit cell T/F. 9. Amorphous, polycrystalline and single crystals are three general types of solids. T/F. T/F 10. The Fermi function defines the probability that a certain energy level is occupied. Keywords (Not applicable to all questions, some may be helpful and can be applied to more than one question): Amorphous, crystalline, holes, polycrystalline, concentration gradient, insulators, drift, valence band, conduction band, density of states, un-doped, Fermi-Dirac, N, Nv, EF, no, KT, Jeep, np- electric field, electrons, Fermi function, unit cell, doped, Bose-Einstein,

Answer 1

2. Carrier in conduction band are referred to as electron.

3.The Bose-Einstein, Fermi-Dirac statistics is applied to electron in semiconductor.

4.The heisenberg's uncertainty principle states that we can not simultaneously determine the position and velocity of electron

5.$\psi$$\psi$^* is a probability amplitude function, while $\psi$ is a complex number.

6. Current in a conduction is due to flow of electron and hole.

7.Extrinsic semiconductors are n-type and P - type.

8. The wave function in Schrödinger eqution are associated with probability amplitude.

9.The valance band in semiconductor is below the fermi level.

10.The unit of density of state in the conduction band is cm^-3.

3.b)

1.False

2.True

3.False

4.True

5.False

6.True

7.True

8.False

9.True

10.True