Alloying induced degradation of the absorption edge of in As xSb1-x

Abstract

In Asx Sb1-x alloys show a strong bowing in the energy gap, the energy gap of the alloy can be less than the gap of the two parent compounds. The authors demonstrate that a consequence of this alloying is a systematic degradation in the sharpness of the absorption edge. The alloy disorder induced band-tail (Urbach tail) characteristics are quantitatively studied for In As0.05 Sb0.95. © 2007 American Institute of Physics.