1. For the compound semiconductor gallium arsenide (GaAs), calculate the atoms s
ID: 1658284 • Letter: 1
Question
1. For the compound semiconductor gallium arsenide (GaAs), calculate the atoms surface density (ie. # of atoms /cm) for As atoms on a As terminated surface of Miller indices (010). The lattice constant for GaAs, a = 5.65A (note: this is a 2-D space problem. 2. Given a solid state material of EF = 4.3 eV. (a) What is the probability that a state at 1.0 eV above the Fermi level will be occupied when temperature is 77 K, 300 K, 1000 K? ive answers for each T in engineering notation, ie.'" (#) x 10" ") (b) Sketch the corresponding distribution function for each case (not to scale but to show trend). 3. An electron that is trapped at the ground state, n 1, in a one-dimensional infinite potential well of width L -1 nm can be excited to higher energy states by absorbing energy from incident photons. Calculate the wavelengths for the three lowest-energy photons capable of exciting electrons from the ground state.Explanation / Answer
Atoms surface density = atoms/volume
=atoms/a^3
=4/(5.65*10^-8)^3
=2.22*10^22 atoms/m^3
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