代做VE320 Intro to Semiconductor Devices Summer 2024 – Problem Set 2代写数据结构语言程序
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Summer 2024 – Problem Set 2
Due: 11:59pm, June 7th
1. (a) Determine the total number (#/cm3) of energy states in silicon between EC and EC + 2kT at (i) T = 300K and (ii) T = 400K. (b) Repeat part (a) for GaAs.
2. (a) For silicon, find the ratio of the density of states in the conduction band at E = EC + kT to the density of states in the valence band at E = EV – kT. (b) Repeat part (a) for Ge.
3. Consider the energy levels shown in Figure 1. Let T = 300K. (a) If E1 – EF = 0.20eV,
determine the probability that an energy state at E = E1 is occupied by an electron and the
probability that an energy state at E = E2 is empty. (b) Repeat part (a) if EF – E2 = 0.40 eV.
Figure 1. Energy levels for problem 3
4. (a) The carrier effective masses in a semiconductor are mn * = 1.21m0 and mp * = 0.70m0.
Determine the position of the intrinsic Fermi level with respect to the center of the bandgap at T = 300K. (b) Repeat part (a) ifmn * = 0.80m0 and mp * = 0.75m0.
5. Semiconductor A has a band gap of 1 eV, while semiconductor B has a band gap of 2 eV. What is the ratio of the intrinsic carrier concentrations in the two materials (niA/niB) at 300 K. Assume any differences in the carrier effective masses maybe neglected.
6. The value p0 in Silicon at T = 300K is 2× 1016cm-3. (a) Determine EF – Ev. (b) Calculate the value of EC – EF. (c) What is the value of n0? (d) Determine EFi – EF.
7. The electron concentration in silicon at T = 300K is n0 = 2 × 105cm −3 . (a) Determine the position of the Fermi level with respect to the valence band energy level. (b) Determine p0. (c) Is it n- or p-type material?