Relationship between the optical gap and the optical-absorption tail breadth in amorphous GaAs
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Data
2004-12-15
Autores
da Silva, JHD
Campomanes, R. R.
Leite, DMG
Orapunt, F.
O'Leary, S. K.
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American Institute of Physics (AIP)
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We study the relationship between the optical gap and the optical-absorption tail breadth for the case of amorphous gallium arsenide (a-GaAs). In particular, we analyze the optical-absorption spectra corresponding to some recently prepared a-GaAs samples. The optical gap and the optical-absorption tail breadth corresponding to each sample is determined. Plotting the optical gap as a function of the corresponding optical-absorption tail breadth, we note that a trend, similar to that found for the cases of the hydrogenated amorphous silicon and hydrogenated amorphous germanium, is also found for the case of a-GaAs. The impact of alloying on the optical-absorption spectrum associated with a-GaAs is also briefly examined. (C) 2004 American Institute of Physics.
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Journal of Applied Physics. Melville: Amer Inst Physics, v. 96, n. 12, p. 7052-7059, 2004.