Spatially indirect radiative recombination in InAlAsSb grown lattice-matched to InP by molecular beam epitaxy

Hirst, Louise C.; Lumb, Matthew P.; Abell, Josh; Ellis, Chase T.; Tischler, Joseph G.; Vurgaftman, Igor; Meyer, Jerry R.; Walters, Robert J.; González, María

doi:10.1063/1.4921883

Title: Spatially indirect radiative recombination in InAlAsSb grown lattice-matched to InP by molecular beam epitaxy

Journal Article · Tue Jun 02 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4921883· OSTI ID:1420513

Hirst, Louise C.; Lumb, Matthew P.; Abell, Josh; Ellis, Chase T.; Tischler, Joseph G.; Vurgaftman, Igor; Meyer, Jerry R.; Walters, Robert J.; González, María

A photoluminescence (PL) spectroscopy study of the bulk quaternary alloy InAlAsSb is presented. Samples were grown lattice-matched to InP by molecular beam epitaxy and two different growth temperatures of 450 °C and 325 °C were compared. Interpolated bandgap energies suggest that the development of this alloy would extend the range of available direct bandgaps attainable in materials lattice-matched to InP to energies as high as 1.81 eV. However, the peak energy of the observed PL emission is anomalously low for samples grown at both temperatures, with the 450 °C sample showing larger deviation from the expected bandgap. A fit of the integrated PL intensity (I) to an I∝Pk dependence, where P is the incident power density, yields characteristic coefficients k = 1.05 and 1.18 for the 450 °C and 325 °C samples, respectively. This indicates that the PL from both samples is dominated by excitonic recombination. A blue-shift in the peak emission energy as a function of P, along with an S-shaped temperature dependence, is observed. These trends are characteristic of spatially-indirect recombination associated with compositional variations. The energy depth of the confining potential, as derived from the thermal quenching of the photoluminescence, is 0.14 eV for the 325 °C sample, which is consistent with the red-shift of the PL emission peak relative to the expected bandgap energy. This suggests that compositional variation is the primary cause of the anomalously low PL emission peak energy. The higher energy PL emission of the 325 °C sample, relative to the 450 °C sample, is consistent with a reduction of the compositional fluctuations. The lower growth temperature is therefore considered more favorable for further growth optimization.

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Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

OSTI ID:: 1420513

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Vol. 117 Journal Issue: 21; ISSN 0021-8979

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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References (35)

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