Alloying induced degradation of the absorption edge of InAs_{x}Sb_{1-x}

TL;DR

This paper investigates how alloying in InAsSb affects its electronic properties, revealing that alloy disorder causes degradation of the absorption edge and broadens the Urbach tail, impacting material performance.

Contribution

It provides a quantitative analysis of the alloy disorder effects on the absorption edge and Urbach tail in InAsSb alloys, highlighting the degradation mechanism.

Findings

Degradation of the absorption edge due to alloying.

Quantitative characterization of Urbach tail in InAsSb.

Alloy disorder causes band-tail broadening.

Abstract

InAs_{x}Sb_{1-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. We 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 InAs_{0.05}Sb_{0.95}.