AlGaSb-Based Solar Cells Grown on GaAs: Structural Investigation and Device Performance

GaSb and alloys based on the 6.1 Å family can be grown metamorphically on substrates such as GaAs allowing for the realization of several multijunction solar cell designs. This paper investigates the molecular beam epitaxy growth, crystal quality, and device performance of Al x Ga 1-x Sb-based sing...

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Veröffentlicht in:IEEE journal of photovoltaics 2017-11, Vol.7 (6), p.1795-1801
Hauptverfasser: Vadiee, E., Renteria, E., Zhang, C., Williams, J. J., Mansoori, A., Addamane, S., Balakrishnan, G., Honsberg, C. B.
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container_end_page 1801
container_issue 6
container_start_page 1795
container_title IEEE journal of photovoltaics
container_volume 7
creator Vadiee, E.
Renteria, E.
Zhang, C.
Williams, J. J.
Mansoori, A.
Addamane, S.
Balakrishnan, G.
Honsberg, C. B.
description GaSb and alloys based on the 6.1 Å family can be grown metamorphically on substrates such as GaAs allowing for the realization of several multijunction solar cell designs. This paper investigates the molecular beam epitaxy growth, crystal quality, and device performance of Al x Ga 1-x Sb-based single-junction solar cells grown on GaAs substrates. The focus is on the optimization of the growth of Al x Ga 1-x Sb on GaAs (001) substrates in order to minimize the threading dislocation density resulting from the large lattice mismatch between GaSb and GaAs. Utilizing optimum growth conditions, solar cells with absorbing layers of different Al x Ga 1-x Sb compositions are studied and compared to control cells grown on lattice-matched GaSb substrates. GaSb, Al 0.15 Ga 0.85 Sb, and Al 0.5 Ga 0.5 Sb solar cells grown on GaAs substrates show open-circuit voltages of 0.16, 0.17, and 0.35 V, respectively. Furthermore, the lattice-mismatched cells demonstrate promising carrier collection with comparable spectral response to lattice-matched control cells grown on GaSb.
doi_str_mv 10.1109/JPHOTOV.2017.2756056
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subjects Aluminum gallium antimonide
Crystal growth
Dislocation density
Epitaxial growth
Epitaxial layers
Gallium antimonides
Gallium arsenide
high lattice mismatch
Lattice matching
Lattices
misfit dislocation
Molecular beam epitaxy
Photonic band gap
Photovoltaic cells
single-junction solar cell
Solar cells
Spectral sensitivity
Substrates
title AlGaSb-Based Solar Cells Grown on GaAs: Structural Investigation and Device Performance
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