Electronic band structure of highly mismatched GaN1−xSbx alloys in a broad composition range

In this letter, we study the optical properties of GaN1�xSbx thin films. Films with an Sb fraction up to 42% were synthesized by alternating GaN-GaSb layers at a constant temperature of 325 �C. The measured optical absorption data of the films are interpreted using a modified band anticrossing model...

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Bibliographic Details
Main Authors: Segercrantz, N., Yu, K.M., Ting, M., Sarney, W.L., Svensson, S.P., Novikov, S.V., Foxon, C.T., Walukiewicz, W.
Format: Article
Language:English
Published: American Institute of Physics 2015
Online Access:https://eprints.nottingham.ac.uk/34755/
Description
Summary:In this letter, we study the optical properties of GaN1�xSbx thin films. Films with an Sb fraction up to 42% were synthesized by alternating GaN-GaSb layers at a constant temperature of 325 �C. The measured optical absorption data of the films are interpreted using a modified band anticrossing model that is applicable to highly mismatched alloys such as GaN1�xSbx in the entire composition range. The presented model allows us to more accurately determine the band gap as well as the band edges over the entire composition range thereby providing means for determining the composition for, e.g., efficient spontaneous photoelectrochemical cell applications