skip to main content

SciTech ConnectSciTech Connect

Title: GaSb thermophotovoltaic cells grown on GaAs by molecular beam epitaxy using interfacial misfit arrays

There exists a long-term need for foreign substrates on which to grow GaSb-based optoelectronic devices. We address this need by using interfacial misfit arrays to grow GaSb-based thermophotovoltaic cells directly on GaAs (001) substrates and demonstrate promising performance. We compare these cells to control devices grown on GaSb substrates to assess device properties and material quality. The room temperature dark current densities show similar characteristics for both cells on GaAs and on GaSb. Under solar simulation the cells on GaAs exhibit an open-circuit voltage of 0.121 V and a short-circuit current density of 15.5 mA/cm{sup 2}. In addition, the cells on GaAs substrates maintain 10% difference in spectral response to those of the control cells over a large range of wavelengths. While the cells on GaSb substrates in general offer better performance than the cells on GaAs substrates, the cost-savings and scalability offered by GaAs substrates could potentially outweigh the reduction in performance. By further optimizing GaSb buffer growth on GaAs substrates, Sb-based compound semiconductors grown on GaAs substrates with similar performance to devices grown directly on GaSb substrates could be realized.
Authors:
; ; ;  [1] ; ;  [2] ;  [1] ;  [3]
  1. Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States)
  2. California NanoSystems Institute, University of California, Los Angeles, California 90095 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22395738
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; CURRENT DENSITY; ELECTRIC POTENTIAL; ELECTRICAL FAULTS; GALLIUM ANTIMONIDES; GALLIUM ARSENIDES; MOLECULAR BEAM EPITAXY; OPTOELECTRONIC DEVICES; SEMICONDUCTOR MATERIALS; SPECTRAL RESPONSE; SUBSTRATES; TEMPERATURE RANGE 0273-0400 K; THERMOPHOTOVOLTAIC CONVERSION