Ordering-induced changes in the optical spectra of semiconductor alloys

Bernard, J. E.; Wei, S.-H.; Wood, D. M.; Zunger, Alex
January 1988
Applied Physics Letters;1/25/1988, Vol. 52 Issue 4, p311
Academic Journal
It is shown how the recently predicted and subsequently observed spontaneous long-range ordering of pseudobinary A0.5B0.5C isovalent semiconductor alloys into the (AC)1(BC)1 superlattice structure (a CuAuI-type crystal) gives rise to characteristic changes in the optical and photoemission spectra. We predict new direct transitions and substantial splittings of transitions absent in the disordered alloy.


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