Linewidth of free excitons in quantum wells: Contribution by alloy disorder scattering

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Abstract
A theory is developed for the luminescence linewidth in a quantum well made of ternaries when the two-dimensionally free excitons undergo alloy disorder scattering. The expression for linewidth shows a L−1 dependence on the well width L for infinite barrier height. For thin wells leakage of wave function into the barrier is considered. A comparison between the experimental data and the present values points out the dominant role of alloy disorder scattering. For wells thinner than 40 Å the calculated values decrease with decreasing well width, indicating the importance of surface roughness scattering.