NDLI: Mechanically stacked four-junction concentrator solar cells

Content Provider	IEEE Xplore Digital Library
Author	Steiner, M.A. Geisz, J.F. Ward, J.S. 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	2015
Description	Author affiliation: Boeing-Spectrolab, Sylmar, CA, USA (King, R.R.; Chiu, P.T.) \|\| Nat. Renewable Energy Lab., Golden, CO, USA (Steiner, M.A.; Geisz, J.F.; Ward, J.S.; Garcia, I.; Friedman, D.J.; France, R.M.; Duda, A.; Olavarria, W.J.; Young, M.; Kurtz, S.R.)
Abstract	Multijunction solar cells can be fabricated by bonding together component cells that are grown separately. Because the component cells are each grown lattice-matched to suitable substrates, this technique allows alloys of different lattice constants to be combined without the structural defects introduced when using metamorphic buffers. Here we present results on the fabrication and performance of four-junction mechanical stacks composed of GaInP/GaAs and GaInAsP/GaInAs tandems, grown on GaAs and InP substrates, respectively. The two tandems were bonded together with a low-index, transparent epoxy that acts as an omni-directional reflector to the GaAs bandedge luminescence, while simultaneously transmitting nearly all of the sub-bandgap 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 enhanced internal optics; all four subcells exhibit excellent material quality. The device was fabricated with four contact terminals so that each tandem can be operated at its maximum power point, which raises the cumulative efficiency and decreases spectral sensitivity. Efficiencies exceeding 38% at one-sun have been demonstrated. Eliminating the series resistance is the key challenge for the concentrator cells. We will discuss the performance of one-sun and concentrator versions of the device, and compare the results to recently fabricated monolithic four-junction cells.
Starting Page	1
Ending Page	3
File Size	2293022
Page Count	3
File Format	PDF
e-ISBN	9781479979448
DOI	10.1109/PVSC.2015.7356151
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Junctions Photovoltaic cells Substrates Gallium arsenide Photonics Couplings Indium phosphide Photon recycling III–V solar cell Mechanical stack Multijunction solar cell
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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