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Proceedings Paper

Quantum wells in multiple junction photovoltaics
Author(s): Thomas N. D. Tibbits; Matthew P. Lumb; Alison Dobbin
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Paper Abstract

Triple-junction (3J) solar cells are the world's most efficient photovoltaic conversion devices, hero cells operating >41% under concentration between 300 and 500 suns. The typical 3J approach has a bandgap combination that limits the cell efficiency at approximately 49%. Different combinations of bandgaps can increase the theoretical efficiency to closer to 60%, and use of metamorphic materials has attempted to demonstrate still higher efficiencies. Multiple quantum wells (MQW) can also be used to fabricate materials with different effective bandgaps from the host semiconductor, and can do so without the attendant lattice constant change and dislocations associated with metamorphics. We show that sufficiently high absorption in MQWs increases the efficiency of 3J solar cells without incorporating defects during epitaxy, both in simulations and in practice.

Paper Details

Date Published: 21 February 2011
PDF: 11 pages
Proc. SPIE 7933, Physics and Simulation of Optoelectronic Devices XIX, 793303 (21 February 2011); doi: 10.1117/12.880599
Show Author Affiliations
Thomas N. D. Tibbits, QuantaSol Ltd. (United Kingdom)
Matthew P. Lumb, QuantaSol Ltd. (United Kingdom)
Alison Dobbin, QuantaSol Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 7933:
Physics and Simulation of Optoelectronic Devices XIX
Bernd Witzigmann; Fritz Henneberger; Yasuhiko Arakawa; Alexandre Freundlich, Editor(s)

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