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The effect of alloy scattering on the mobility of holes in a quantum well is considered from a theoretical perspective. Issues relating to the definition and value of the alloy potential are discussed, and results are presented showing how the alloy scattering component of the overall mobility varies with temperature, carrier density and alloy concentration. Screening is allowed for and found to be important at low temperatures. By considering other scattering mechanisms such as interface impurities, surface roughness and acoustic phonons, we argue that alloy scattering is not a significant limiting factor as regards device applications, contrary to recent claims.
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Kearney et al. (1998) studied this question.
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