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Interstitial light-trapping design for multi-junction solar cells

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Title: Interstitial light-trapping design for multi-junction solar cells
Authors: Mellor, AV
Hylton, N
Maier, S
Ekins-Daukes, N
Item Type: Journal Article
Abstract: We present a light-trapping design capable of significantly enhancing the photon absorption in any subcell of a multi-junction solar cell. The design works by coupling incident light into waveguide modes in one of the subcells via a diffraction grating, and preventing these modes from leaking into lower subcells via a low-index layer and a distributed Bragg reflector, which together form an omnidirectional mirror. This allows the thickness of the target subcell to be reduced without compromising photon absorption, which improves carrier collection, and therefore photocurrent. The paper focuses on using the composite structure to improve the radiation hardness of a InGaP/Ga(In)As/Ge space solar cell. In this context, it is shown via simulation that the Ga(In)As middle-cell thickness can be reduced from 3500 to 700 nm, whilst maintaining strong photon absorption, and that this leads to a significantly improved end-of-life photocurrent in the Ga(In)As middle cell. However, the design can in general be applied to a wide range of multi-junction solar cell types. We discuss the principles of operation of the design, as well as possible methods of its fabrication and integration into multi-junction solar cells.
Issue Date: 20-Sep-2016
Date of Acceptance: 6-Sep-2016
URI: http://hdl.handle.net/10044/1/39892
DOI: https://dx.doi.org/10.1016/j.solmat.2016.09.005
ISSN: 0927-0248
Publisher: Elsevier
Start Page: 212
End Page: 218
Journal / Book Title: Solar Energy Materials and Solar Cells
Volume: 159
Copyright Statement: © 2016, Elsevier Ltd. All rights reserved. This manscript licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: 657359
EP/M025012/1
Keywords: Science & Technology
Technology
Physical Sciences
Energy & Fuels
Materials Science, Multidisciplinary
Physics, Applied
Materials Science
Physics
Multijunction
Radiation hardness
Light trapping
Nanophotonics
NANOIMPRINT LITHOGRAPHY
SILICON
EFFICIENCY
GRATINGS
Energy
09 Engineering
03 Chemical Sciences
02 Physical Sciences
Publication Status: Published
Appears in Collections:Physics
Experimental Solid State
Centre for Environmental Policy
Faculty of Natural Sciences



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