@inproceedings{d13dafcf3c9d443c8387924d3946a6e5,
title = "AlInAsSb for GaSb-based multi-junction solar cells",
abstract = "Bandgap engineering, by means of alloying or inserting nanostructures, is the bedrock of high efficiency photovoltaics. III-V quaternary alloys in particular enable bandgap tailoring of a multi-junction subcell while conserving a single lattice parameter. Among the possible candidates, AlInAsSb could in theory reach the widest range of bandgap energies while being lattice-matched to InP or GaSb. Although these material systems are still emerging photovoltaic segments, they do offer advantages for multi-junction design. GaSbbased structures in particular can make use of highly efficient GaSb/InAs tunnel junctions to connect the subcells. There has been only little information concerning GaSb-lattice matched AlInAsSb in the literature. The alloy's miscibility gap can be circumvented by the use of non-equilibrium techniques. Nevertheless, appropriate growth conditions remain to be found in order to produce a stable alloy. Furthermore, the abnormally low bandgap energies reported for the material need to be confirmed and interpreted with a multi-junction perspective. In this work, we propose a tandem structure made of an AlInAsSb top cell and a GaSb bottom cell. An epitaxy study of the AlInAsSb alloy lattice-matched to GaSb was first performed. The subcells were then grown and processed. The GaSb subcell yielded an efficiency of 5.9% under 1 sun and the tandem cell is under optimization. Preliminary results are presented in this document.",
keywords = "AlInAsSb, GaSb, multi-junction photovoltaics",
author = "J. Tournet and Y. Rouillard and E. Tourni{\'e}",
note = "Publisher Copyright: {\textcopyright} 2018 SPIE.; Physics, Simulation, and Photonic Engineering of Photovoltaic Devices VII 2018 ; Conference date: 31-01-2018 Through 01-02-2018",
year = "2018",
doi = "10.1117/12.2289791",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Alexandre Freundlich and Masakazu Sugiyama and Laurent Lombez",
booktitle = "Physics, Simulation, and Photonic Engineering of Photovoltaic Devices VII",
address = "United States",
}