Determination of the X6 shear tetragonal deformation potential of AlAs using a time-windowing photoluminescence technique

N. Sylvain Charbonneau; Jeffrey F. Young; Peter T. Coleridge

doi:10.1117/12.137591

3 September 1992 Determination of the X₆ shear tetragonal deformation potential of AlAs using a time-windowing photoluminescence technique

N. Sylvain Charbonneau, Jeffrey F. Young, Peter T. Coleridge

Author Affiliations +

Proceedings Volume 1675, Quantum Well and Superlattice Physics IV; (1992) https://doi.org/10.1117/12.137591
Event: Semiconductors '92, 1992, Somerset, NJ, United States

Abstract

Based on information obtained from steady-state and time-resolved photoluminescence (PL) experiments done as a function of uniaxial stress, the symmetry of the lowest conduction band state for a series of type II Al_0.15Ga_0.85As/AlAs multiple quantum wells with a nominally fixed alloy thickness of 4.2 nm and AlAs thicknesses from 4.8 nm to 7.8 nm, is reported. Structures with AlAs thickness less than 6.2 nm have the X_z state (heavy mass in the growth direction z) as the lowest lying conduction band level while for thicker AlAs layers the X_x,y states are lowest in energy. For samples with X_x,y ground states, a time-windowing technique is used to simultaneously observe the PL from the X_z and lower-lying X_x,y states, providing a direct measure of the energy separation of excitons associated with the in- and out-of-plane X valleys in the AlAs. By studying the effect of the uniaxial stress on the time-resolved PL spectra, the X₆ shear tetragonal deformation potential of AlAs, E₂, can be estimated without complications due to the stress dependence of the valence band energy. The value of E₂ obtained from two samples with different layer thicknesses is 5.8 +/- 0.1 eV.

Citation Download Citation

N. Sylvain Charbonneau, Jeffrey F. Young, and Peter T. Coleridge "Determination of the X₆ shear tetragonal deformation potential of AlAs using a time-windowing photoluminescence technique", Proc. SPIE 1675, Quantum Well and Superlattice Physics IV, (3 September 1992); https://doi.org/10.1117/12.137591

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