Determination of the interdiffusion of Al and Ga in undoped (Al,Ga)As/GaAs quantum wells
- 1 September 1986
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 49 (9), 519-521
- https://doi.org/10.1063/1.97107
Abstract
We have employed photoluminescence spectroscopy to determine the temperature dependence of the interdiffusion coefficient of Al and Ga in GaAs/Al0.3Ga0.7As quantum wells. The position of the photoluminescence peaks, due to the n=1 electron to heavy‐hole transition, was measured before and after annealing the samples. A variational calculation was employed to determine the expected position of these photoluminescence peaks and from this a value of the interdiffusion coefficient was extracted. The interdiffusion process is characterized by an activation energy of about 6 eV leading to an interdiffusion coefficient at 850 °C of 4×10−19 cm2/s. This technique allows for the measurement of small diffusion coefficients in a wide variety of material systems.Keywords
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