Giant spin-orbit bowing in GaAs1-xBix.

Electronic Structure of Dilute Bismide Alloys

The dilute bismide semiconductor GaAs1-xBix represents an interesting counterpart of the dilute nitride alloy GaAs1-xNx. Both exhibit giant bandgap bowing phenomena but with oppositely directed effects on the valence and conduction bands respectively. The optical properties of the dilute bismide alloy will be contrasted with those of the dilute nitride and the similarities and distinctions betw...

First Principles Study on Electronic Structure and Optical Properties of Ternary GaAs:Bi Alloy

The electronic structure and optical properties of ternary GaAs:Bi alloy are investigated by first principles calculations. It is found that the band gap of GaAs1-xBix decreases monotonously with the increasing of Bi concentration, resulting in the fundamental absorption edge and main absorption peaks of GaAs1-xBix shifting toward lower energy with the increase of the Bi content. The optical co...

Unexpected Bismuth Concentration Profiles in MOVPE GaAs1-xBix Films Revealed by HAADF STEM Imaging

Recent interest in the growth of GaAs1-xBix semiconductor alloys with controlled Bi concentration has been stimulated by the sensitivity of the bandgap energy and valence band structure to Bi concentration, x. These sensitivities offer the possibility to engineer both the band gap and band offsets at junctions to improve the performance of devices. Realization of this potential, however, requir...

Compositional evolution of Bi-induced acceptor states in GaAs1−xBix alloy

Valence Band Structure of InAs1−xBix and InSb1−xBix Alloy Semiconductors Calculated Using Valence Band Anticrossing Model

The valence band anticrossing model has been used to calculate the heavy/light hole and spin-orbit split-off energies in InAs(1-x)Bi(x) and InSb(1-x)Bi(x) alloy systems. It is found that both the heavy/light hole, and spin-orbit split E + levels move upwards in energy with an increase in Bi content in the alloy, whereas the split E - energy for the holes shows a reverse trend. The model is also...