University Physics with Modern Physics (14th Edition)
14th Edition
ISBN: 9780321973610
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Question
Chapter 42, Problem 42.21DQ
To determine
Why the intrinsic conductivity of semiconductors always increases rapidly with increasing temperature while that of most metals decrease gradually with increasing temperature.
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In a certain semiconductor, the valence band can be approximated by the function E(k) = Eo ak² and the
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The electrical conductivities of most metals decrease gradually with increasing temperature, but the intrinsic conductivity of semiconductors always increases rapidly with increasing temperature. What causes the difference?
Doping is necessary in order to enhance the conduction ability of a semiconductor. Support this statement by giving suitable arguments?
Chapter 42 Solutions
University Physics with Modern Physics (14th Edition)
Ch. 42.1 - If electrons obeyed the exclusion principle but...Ch. 42.2 - Prob. 42.2TYUCh. 42.3 - Prob. 42.3TYUCh. 42.4 - One type of thermometer works by measuring the...Ch. 42.5 - Prob. 42.5TYUCh. 42.6 - Prob. 42.6TYUCh. 42.7 - Suppose a negative charge is placed on the gate of...Ch. 42 - Van der Waals bonds occur in many molecules, but...Ch. 42 - Prob. 42.2DQCh. 42 - The H2+ molecule consists of two hydrogen nuclei...
Ch. 42 - The moment of inertia for an axis through the...Ch. 42 - Prob. 42.5DQCh. 42 - Prob. 42.6DQCh. 42 - Prob. 42.7DQCh. 42 - The air you are breathing contains primarily...Ch. 42 - Prob. 42.9DQCh. 42 - Prob. 42.10DQCh. 42 - What factors determine whether a material is a...Ch. 42 - Prob. 42.12DQCh. 42 - Prob. 42.13DQCh. 42 - Prob. 42.14DQCh. 42 - Prob. 42.15DQCh. 42 - Prob. 42.16DQCh. 42 - Prob. 42.17DQCh. 42 - Prob. 42.18DQCh. 42 - Prob. 42.19DQCh. 42 - Prob. 42.20DQCh. 42 - Prob. 42.21DQCh. 42 - Prob. 42.22DQCh. 42 - Prob. 42.23DQCh. 42 - Prob. 42.24DQCh. 42 - If the energy of the H2 covalent bond is 4.48 eV,...Ch. 42 - An Ionic Bond, (a) Calculate the electric...Ch. 42 - Prob. 42.3ECh. 42 - Prob. 42.4ECh. 42 - Prob. 42.5ECh. 42 - Prob. 42.6ECh. 42 - Prob. 42.7ECh. 42 - Two atoms of cesium (Cs) can form a Cs2 molecule....Ch. 42 - Prob. 42.9ECh. 42 - Prob. 42.10ECh. 42 - A lithium atom has mass 1.17 1026 kg, and a...Ch. 42 - Prob. 42.12ECh. 42 - When a hypothetical diatomic molecule having atoms...Ch. 42 - The vibrational and rotational energies of the CO...Ch. 42 - Prob. 42.15ECh. 42 - Prob. 42.16ECh. 42 - Prob. 42.17ECh. 42 - Prob. 42.18ECh. 42 - Prob. 42.19ECh. 42 - Prob. 42.20ECh. 42 - Prob. 42.21ECh. 42 - Prob. 42.22ECh. 42 - Prob. 42.23ECh. 42 - Prob. 42.24ECh. 42 - Prob. 42.25ECh. 42 - Prob. 42.26ECh. 42 - Prob. 42.27ECh. 42 - Prob. 42.28ECh. 42 - Prob. 42.29ECh. 42 - Prob. 42.30ECh. 42 - Prob. 42.31ECh. 42 - Prob. 42.32ECh. 42 - Prob. 42.33PCh. 42 - Prob. 42.34PCh. 42 - Prob. 42.35PCh. 42 - The binding energy of a potassium chloride...Ch. 42 - (a) For the sodium chloride molecule (NaCl)...Ch. 42 - Prob. 42.38PCh. 42 - Prob. 42.39PCh. 42 - Prob. 42.40PCh. 42 - Prob. 42.41PCh. 42 - Prob. 42.42PCh. 42 - Prob. 42.43PCh. 42 - Prob. 42.44PCh. 42 - Prob. 42.45PCh. 42 - Prob. 42.46PCh. 42 - Prob. 42.47PCh. 42 - Prob. 42.48PCh. 42 - Prob. 42.49PCh. 42 - Prob. 42.50PCh. 42 - Prob. 42.51PCh. 42 - Prob. 42.52PCh. 42 - Prob. 42.53CPCh. 42 - Prob. 42.54CPCh. 42 - Prob. 42.55CPCh. 42 - Prob. 42.56PPCh. 42 - Prob. 42.57PPCh. 42 - Prob. 42.58PP
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- What is the main difference between an insulator and a semiconductor?arrow_forwardWhy does the horizontal Line in the graph in Figure 9.12 suddenly stop at the Fermi energy? Figure 9.12 (a) Density of state for a free electron gas; (b) probability that a state is occupied at T = 0 K; (c) density if occupied states at T = 0 k.arrow_forwardAt what temperature, in terms of Tc, is the critical field of a superconductor one-half its value at T = 0 K?arrow_forward
- Question 2: а. Find the conductivity of an intrinsic semiconductor which have the following values: µe = (0 + 0.25) m²/V.s; µp = (0+ 0.035) m²/V.s; n¡ = (0 + 1.55) × 10*m³.arrow_forwardQ3/ A semiconductor has donor and accepter concentrations of Np and NA, respectively. What relationships must be used to determine the electron n and hole p concentration.arrow_forwardProblem 1. The resistivity of an intrinsic semiconductor sample at 280 K was measured to be 15 Q·cm. At 320 K, it was 0.6 Q cm. Assuming that the mobilities of both electrons and holes decrease with temperature as µejh~ 1/T 32, find the bandgap of this material. Problem 2. You wish to create a 10-k2 resistor using an n-type (Na= 0) silicon bar of length L = 5 mm and cross-sectional area A = 0.05 mm. Assume complete ionization with no = Na and neglect the hole contribution to conductivity. Electron mobility in this material is known to depend on donor concentration according to an empirical formula (see section 6 of the Wikipedia article https://en.wikipedia.org/wiki/Electron_mobility) Hmax - Mmin µ(Na) = Hmin + 1+ (Na/N,)" with the parameters Umin 65 cm²/(V-s), µmax 1330 cm/(V s), N,= 8.5·1016 cm³, a = 0.72. (a) Determine the conductivity of your material needed to obtain the desired resistance. (b) Find the doping concentration needed to obtain the desired resistance. You will need to…arrow_forward
- A20. An intrinsic silicon semiconductor is uniformly doped with acceptors to a level of 2x1017 cm-³. At room temperature, the electron concentration in this semiconductor is found to be 5x10² cm-3. What is the intrinsic carrier concentration of this semiconductor at room temperature and describe qualitatively how would the electron concentration change if the temperature increased slightly?arrow_forwardHow does a semiconductor vary from a conductor and an insulator, and what does it do? In your explanation, including a chart.arrow_forwardThe figure below is a part of the energy band diagram of a P-type semiconductor bar under equilibrium conditions (i.e., EF is constant). The valence band edge is sloped because doping is nonuniform along the bar. Assume that Ev rises with a slope of ∆ ⁄ L .arrow_forward
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