Peer-Reviewed Journal Details
Mandatory Fields
M. Seifikar, E. P. O'Reilly and S. Fahy
Nanoscale Research Letters
Optical Absorption of dilute nitride alloys using self-consistent Green's function method
WOS: 8 ()
Optional Fields
Dilute nitride semiconductors; Self-consistent Greenís function; Optical absorption; Band anticrossing model
We have calculated the optical absorption for InGaNAs and GaNSb using the band anticrossing (BAC) model and a self-consistent Greenís function (SCGF) method. In the BAC model, we include the interaction of isolated and pair N levels with the host matrix conduction and valence bands. In the SCGF approach, we include a full distribution of N states, with non-parabolic conduction and light-hole bands, and parabolic heavy-hole and spin-split-off bands. The comparison with experiments shows that the first model accounts for many features of the absorption spectrum in InGaNAs; including the full distribution of N states improves this agreement. Our calculated absorption spectra for GaNSb alloys predict the band edges correctly but show more features than are seen experimentally. This suggests the presence of more disorder in GaNSb alloys in comparison with InGaNAs.
Grant Details
Science Foundation Ireland