Low bandgap GaInAsSb thermophotovoltaic cells on GaAs substrate with advanced metamorphic buffer layer

Lu, Qi and Montesdeoca Cardenes, Denise and Carrington, Peter James and Marshall, Andrew Robert Julian and Krier, Anthony and Beanland, Richard (2019) Low bandgap GaInAsSb thermophotovoltaic cells on GaAs substrate with advanced metamorphic buffer layer. Solar Energy Materials and Solar Cells, 191. pp. 406-412. ISSN 0927-0248

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Thermophotovoltaic (TPV) devices based on GaInAsSb lattice matched to GaSb (100) substrates have demonstrated high external quantum efficiencies (EQEs) in the mid-infrared spectral range, making them promising candidates for waste heat recovery from high temperature “blackbody” sources. In this work, the GaInAsSb alloy has been integrated onto more cost-effective GaAs (100) substrates by using advanced metamorphic buffer layer techniques in molecular beam epitaxy (MBE), which included an interfacial misfit (IMF) array at the GaSb/GaAs interface followed by GaInSb/GaSb dislocation filtering layers. The threading dislocations in the GaInAsSb region can be efficiently supressed, resulting in high quality materials for TPV applications. To determine the performance of the GaInAsSb TPV on GaAs it was compared with a cell grown lattice matched onto GaSb substrate having the same structure. The resulting TPV on GaAs exhibited similar dark current-voltage characteristics with that on GaSb. Under illumination from an 800 °C silicon nitride emitter, the short circuit current density (Jsc) from the GaInAsSb TPVs on GaAs reached more than 90% of the control cell on GaSb, and the open circuit voltage (Voc) exceeded 80% of the cell on GaSb. The EQE from the TPV on GaAs reached around 62%, the highest value reported from this type of TPV on GaAs. With improved TPV structure design, large area GaInAsSb TPV panels on GaAs substrates can be realized in the future for waste heat energy recovery applications.

Item Type:
Journal Article
Journal or Publication Title:
Solar Energy Materials and Solar Cells
Additional Information:
This is the author’s version of a work that was accepted for publication in Solar Energy Materials and Solar Cells. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy Materials and Solar Cells, 191, 2019 DOI: 10.1016/j.solmat.2018.11.036
Uncontrolled Keywords:
?? thermophotovoltaicsgainassbdislocation filteringinterfacial misfit arraysurfaces, coatings and filmselectronic, optical and magnetic materialsrenewable energy, sustainability and the environment ??
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Deposited On:
08 Jan 2019 13:20
Last Modified:
15 Jul 2024 18:44