High-quantum-efficiency 0.5 eV GaInAsSb/GaSb thermophotovoltaic devices

Wang, C. A.; Choi, H. K.; Ransom, Sara L.; Charache, G.W.; Danielson, L. R.; DePoy, D.M.

doi:10.1063/1.124676

Cited by 131 publications

(84 citation statements)

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“…Energy-dispersive x-ray analysis in a scanning transmission electron microscope confirmed that lighter regions are InSb-rich, while darker regions are GaAs-rich [77]. Reciprocal space mapping in HRXRD studies indicated that the broadening is also due to epilayer tilt [76].…”

Section: Effect Of Growth Kinetics On Phase Separation In Gainassbmentioning

confidence: 99%

“…Systematic experiments have shown that phase separation in GaInAsSb epilayers can be greatly reduced by affecting growth kinetics so that adatom surface diffusion is limited. It was found that growth temperature, growth rate, and substrate miscut had a large impact on structural and optical qualities [34,[74][75][76][77]. This huge sensitivity of material quality to growth conditions is demonstrated by comparing characterization data of two GaInAsSb layers that were grown at a GaInAsSb is further into the miscibility gap than 0.55-eV GaInAsSb.…”

Section: Effect Of Growth Kinetics On Phase Separation In Gainassbmentioning

confidence: 99%

“…PL broadening most likely is due to the compositional inhomogenities associated with phase separation. Carriers recombine in the compositionally nonuniform, lower-E g InSb-rich regions.Energy-dispersive x-ray analysis in a scanning transmission electron microscope confirmed that lighter regions are InSb-rich, while darker regions are GaAs-rich [77]. Reciprocal space mapping in HRXRD studies indicated that the broadening is also due to epilayer tilt [76].…”

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confidence: 99%

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Progress and Continuing Challenges in GaSb-based III-V Alloys and Heterostructures Grown by Organometallic Vapor Phase Epitaxy

2004

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This paper discusses progress in the preparation of mid-IR GaSb-based III-V materials grown by organometallic vapor phase epitaxy (OMVPE). The growth of these materials is complex, and fundamental and practical issues associated with their growth are outlined. Approaches that have been explored to further improve the properties and performance are briefly reviewed.Recent materials and device results on GaInAsSb bulk layers and GaInAsSb/AlGaAsSb heterostructures, grown lattice matched to GaSb, are presented. State-of-the-art GaInAsSb materials and thermophotovoltaic devices have been achieved. This progress establishes the high potential of OMVPE for mid-IR GaSb-based devices. 2 IntroductionGaSb-based III-V semiconductor alloys are attractive for optoelectronic devices such as midinfrared lasers, detectors, and thermophotovoltaics (TPVs); and electronic devices such as highspeed transistors and resonant-tunneling diodes [1]. Alloys of particular interest are based on the binaries GaSb, AlSb, InSb, GaAs, AlAs, and InAs. As shown in Fig. 1 GaSb-based heterostructures have been successfully grown by all of the major epitaxial techniques, including liquid phase epitaxy, molecular beam epitaxy (MBE), and organometallic vapor phase epitaxy (OMVPE). While each of these technologies must contend with numerous challenges that are specific to the method of choice, several fundamental issues related to Sbcontaining III-V alloys exist. These include the low volatility of Sb compared to P-and Asbased alloys, which necessitates stringent control of V/III ratio; the requirement to use low growth temperatures (450 to 600 °C); the existence of a large solid phase miscibility gap for many Sb-containing alloys; and the affinity of AlSb-based alloys to incorporate O and C. As a consequence, growth of Sb-based alloys differs significantly from the more conventional As-and P-based materials, which certainly has made the development of the GaSb-based materials and devices very challenging.This paper discusses both the fundamental and practical issues associated with the growth of mid-IR GaSb-based III-V alloys grown by OMVPE, and briefly reviews approaches that have been explored to further improve the properties and performance of bulk layers as well as heterostructures. Growth considerations include the importance of suitable organometallic precursors and control of V/III ratio; miscibility gaps in ternary and quaternary alloys; C and O contamination in AlSb-based alloys; in-situ monitoring; GaSb substrate quality and preparation;and heterostructure growth. Recent materials and device results are limited to GaInAsSb and 3 AlGaAsSb alloys grown lattice matched to GaSb, since two comprehensive reviews on OMVPE growth of Sb-based materials were recently published [5,6]. Growth considerations and brief review of previous work Fundamental differences between Sb-based and P-or As-based III-V alloysOne of the early premises of OMVPE growth of III-V semiconductors was the utilization of precursors based on group III organometallics a...

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Section: Effect Of Growth Kinetics On Phase Separation In Gainassbmentioning

confidence: 99%

Section: Effect Of Growth Kinetics On Phase Separation In Gainassbmentioning

confidence: 99%

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confidence: 99%

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Progress and Continuing Challenges in GaSb-based III-V Alloys and Heterostructures Grown by Organometallic Vapor Phase Epitaxy

2004

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“…Two different alloy compositions were grown: Ga 0.89 In 0.11 As 0.09 Sb 0.91 and Ga 0.8 In 0.2 As 0.17 Sb 0.83 , which have 300 K photoluminescence (PL) peak energy at 0.6 eV and 0.5-eV, respectively. The GaInAsSb alloy composition was determined from the peak energy in 300 K PL spectra and lattice mismatch, as previously described [24]. The microstructure of GaInAsSb was studied by examining <110> cross-sections in TEM operated at 200 kV.…”

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confidence: 99%

“…GaInAsSb epitaxial layers were grown nominally lattice matched to (001) GaSb substrates with miscut angles of 2 or 6° toward (1-11)B or (101) by OMVPE as previously described [24][25]. The growth temperature was either 525 or 575 °C.…”

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confidence: 99%