Determination of the interdiffusion of Al and Ga in undoped (Al,Ga)As/GaAs quantum wells

Schlesinger, T. E.; Kuech, T.
September 1986
Applied Physics Letters;9/1/1986, Vol. 49 Issue 9, p519
Academic Journal
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.


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