Journal
JOURNAL OF APPLIED PHYSICS
Volume 111, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4730396
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Images of the steady-state luminescence of passivated GaAs self-standing films under excitation by a tightly focussed laser are analyzed as a function of light excitation power. While unipolar diffusion of photoelectrons is dominant at very low light excitation power, an increased power results in a decrease of the diffusion constant near the center of the image due to the onset of ambipolar diffusion. The results are in agreement with a numerical solution of the diffusion equations and with a physical analysis of the luminescence intensity at the centre of the image, which permits the determination of the ambipolar diffusion constant as a function of electron concentration. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4730396]
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