NDLI: Optically Enhanced Photon Recycling in Mechanically Stacked Multijunction Solar Cells

Content Provider	IEEE Xplore Digital Library
Author	Steiner, M.A. Geisz, J.F. Scott Ward, J. Garcia, I. Friedman, D.J. King, R.R. Chiu, P.T. France, R.M. Duda, A. Olavarria, W.J. Young, M. Kurtz, S.R.
Copyright Year	2011
Abstract	Multijunction solar cells can be fabricated by mechanically bonding together component cells that are grown separately. Here, we present four-junction four-terminal mechanical stacks composed of GaInP/GaAs tandems grown on GaAs substrates and GaInAsP/GaInAs tandems grown on InP substrates. The component cells were bonded together with a low-index transparent epoxy that acts as an angularly selective reflector to the GaAs bandedge luminescence, while simultaneously transmitting nearly all of the subbandgap light. As determined by electroluminescence measurements and optical modeling, the GaAs subcell demonstrates a higher internal radiative limit and, thus, higher subcell voltage, compared with GaAs subcells without the epoxy reflector. The best cells demonstrate 38.8 ± 1.0% efficiency under the global spectrum at 1000 W/m² and ~ 42% under the direct spectrum at ~100 suns. Eliminating the series resistance is the key challenge for further improving the concentrator cells.
Starting Page	358
Ending Page	365
Page Count	8
File Size	797664
File Format	PDF
ISSN	21563381
Volume Number	6
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Junctions Gallium arsenide Photonics Couplings Photovoltaic cells Substrates II-VI semiconductor materials III–V solar cell Luminescent coupling mechanical stack multijunction solar cell photon recycling
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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