Absorption enhancement in ultra-thin textured AlGaAs films
Abstract
We have studied light randomization and the absorption enhancement in textured ultra-thin AlxGa1-xAs films, with a thickness corresponding to a few optical wavelengths. A correlation between the degree of light randomization and trapping, with the scale length of the texturization geometry was found. The observed absorption enhancement corresponds to 90% of the best possible theoretical value, or 90% light randomization. A modified photon gas model is proposed to calculate the light trapping and absorption at the band edge in the textured thin films. © 1999 Elsevier Science B.V. All rights reserved.
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