Auger recombination in long-wavelength infrared InN[sub x]Sb[sub 1-x] alloys

Murdin, B. N.; Kamal-Saadi, M.; Lindsay, A.; O'Reilly, E. P.; Adams, A. R.; Nott, G. J.; Crowder, J. G.; Pidgeon, C. R.; Bradley, I. V.; Wells, J.-P. R.; Burke, T.; Johnson, A. D.; Ashley, T.
March 2001
Applied Physics Letters;3/12/2001, Vol. 78 Issue 11, p1568
Academic Journal
Dilute nitrogen alloys of InSb exhibit strong band gap bowing with increasing nitrogen composition, shifting the absorption edge to longer wavelengths. The conduction band dispersion also has an enhanced nonparabolicity, which suppresses Auger recombination. We have measured Auger lifetimes in alloys with 11 and 15 μm absorption edges using a time-resolved pump-probe technique. We find the lifetimes to be longer at room temperature than equivalent band gap Hg[sub 1-y]Cd[sub y]Te alloys at the same quasi-Fermi level separation. The results are explained using a modified k·p Hamiltonian which explicitly includes interactions between the conduction band and a higher lying nitrogen-related resonant band. © 2001 American Institute of Physics.


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