Study of the valence band offsets between InAs and InAs1-xSbx alloys

Elizabeth H. Steenbergen; Oray O. Cellek; Dmitri Lubyshev; Yueming Qiu; Joel M. Fastenau; Amy W. K. Liu; Yong-Hang Zhang

doi:10.1117/12.907101

20 January 2012 Study of the valence band offsets between InAs and InAs_1-xSb_x alloys

Elizabeth H. Steenbergen, Oray O. Cellek, Dmitri Lubyshev, Yueming Qiu, Joel M. Fastenau, Amy W. K. Liu, Yong-Hang Zhang

Author Affiliations +

Proceedings Volume 8268, Quantum Sensing and Nanophotonic Devices IX; 82680K (2012) https://doi.org/10.1117/12.907101
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

InAs/InAs_1-xSb_x strain-balanced superlattices (SLs) on GaSb are a viable alternative to the well-studied InAs/Ga_1-xIn_xSb SLs for mid- and long-wavelength infrared (MWIR and LWIR) laser and photodetector applications, but the InAs/InAs_1-xSb_x SLs are not as thoroughly investigated. Therefore, the valence band offset between InAs and InAs/InAs_1-xSb_x, a critical parameter necessary to predict the SL bandgap, must be further examined to produce InAs/InAs_1-xSb_x SLs for devices operational at MWIR and LWIR wavelengths. The effective bandgap energies of InAs/InAs_1-xSb_x SLs with x = 0.28 - 0.40 are designed using a three-band envelope function approximation model. Multiple 0.5 μm-thick SL samples are grown by molecular beam epitaxy on GaSb substrates. Structural characterization using x-ray diffraction and atomic force microscopy reveals excellent crystalline properties with SL zero-order peak full-width-half-maximums between 30 and 40 arcsec and 20 x 20 μm2 area root-mean-square roughnesses of 1.6 - 2.7 A. Photoluminescence (PL) spectra of these samples cover 5 to 8 μm, and the band offset between InAs and InAs/InAs_1-xSb_x is obtained by fitting the PL peaks to the calculated values. The bowing in the valence band is found to depend on the initial InAs/InSb valence band offset and changes linearly with x as C_{Ev_bowing}= 1.58x - 0.62 eV when an InAs/InAs_1-xSb_x bandgap bowing parameter of 0.67 eV is assumed. A fractional valence band offset, Q_v = ΔE_v/ΔE_g, of 1.75 ± 0.03 is determined and is practically constant in the composition range studied.

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Elizabeth H. Steenbergen, Oray O. Cellek, Dmitri Lubyshev, Yueming Qiu, Joel M. Fastenau, Amy W. K. Liu, and Yong-Hang Zhang "Study of the valence band offsets between InAs and InAs_1-xSb_x alloys", Proc. SPIE 8268, Quantum Sensing and Nanophotonic Devices IX, 82680K (20 January 2012); https://doi.org/10.1117/12.907101

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