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Proceedings Paper

Performance impact of luminescent coupling on monolithic 12-junction phototransducers for 12 V photonic power systems
Author(s): Matthew Wilkins; Christopher E. Valdivia; Sanmeet Chahal; Masanori Ishigaki; Denis P. Masson; Simon Fafard; Karin Hinzer
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Paper Abstract

A twelve-junction monolithically-integrated GaAs phototransducer device with >60% power conversion efficiency and >14 V open-circuit voltage under monochromatic illumination is presented. Drift-diffusion based simulations including a luminescent coupled generation term are used to study photon recycling and luminescent coupling between each junction. We find that luminescent coupling effectively redistributes any excess generated photocurrent between all junctions leading to reduced wavelength sensitivity. This broadened response is consistent with experimental measurements of devices with high-quality materials exhibiting long carrier lifetimes. Photon recycling is also found to significantly improve the voltage of all junctions, in contrast to multi-junction solar cells which utilize junctions of differing bandgaps and where high-bandgap junctions benefit less from photon recycling.

Paper Details

Date Published: 14 March 2016
PDF: 6 pages
Proc. SPIE 9743, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V, 97430W (14 March 2016); doi: 10.1117/12.2213727
Show Author Affiliations
Matthew Wilkins, Univ. of Ottawa (Canada)
Christopher E. Valdivia, Univ. of Ottawa (Canada)
Sanmeet Chahal, Univ. of Ottawa (Canada)
Masanori Ishigaki, Toyota Technical Ctr., USA (United States)
Denis P. Masson, Azastra Opto Inc. (Canada)
Simon Fafard, Azastra Opto Inc. (Canada)
Karin Hinzer, Univ. of Ottawa (Canada)

Published in SPIE Proceedings Vol. 9743:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V
Alexandre Freundlich; Laurent Lombez; Masakazu Sugiyama, Editor(s)

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