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Polyhedral Specular Reflector Design for Ultra-High Spectrum Splitting Solar Module Efficiencies (>50%)

Eisler, Carissa N. and Kosten, Emily D. and Warmann, Emily C. and Atwater, Harry A. (2013) Polyhedral Specular Reflector Design for Ultra-High Spectrum Splitting Solar Module Efficiencies (>50%). In: High and Low Concentrator Systems for Solar Electric Applications VIII. Proceedings of SPIE. No.8821. International Society for Optical Engineering , Bellingham, WA, Art. No. 88210B. ISBN 978-0-8194-9671-3. https://resolver.caltech.edu/CaltechAUTHORS:20131114-112832608

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Abstract

One pathway to achieving ultra-high solar efficiencies (>50%) is employing a spectrum splitting optical element with at least 6 subcells and significant concentration (100-500 suns). We propose a design to meet these criteria, employing specular reflection to split and divide the light onto appropriate subcells. The polyhedral specular reflector incorporates a high index parallelepiped with seven subcells. The subcells are placed around the parallelepiped such that light entering at normal incidence encounters the subcells in order from highest to lowest bandgap, with the ray path reflecting at a 90° angle until the light is fully absorbed. Previous studies of the design have shown that concentration and filters are necessary to achieve high efficiencies and thus the current iteration of the design employs shortpass filters and two stages of concentration. Ray tracing of the current iteration shows exceeding 50% efficiency is possible for current subcell qualities with perfect shortpass filters while 50% module efficiencies are only possible for very high quality (>6% ERE) subcells with commercially available shortpass filters. However, even with commercially available filters and achievable subcell quality, ray tracing results show very high (>43%) module efficiency.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.2024288DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1750248PublisherArticle
ORCID:
AuthorORCID
Eisler, Carissa N.0000-0002-5755-5280
Warmann, Emily C.0000-0002-2810-4608
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2013 SPIE.
Subject Keywords:spectrum splitting; multijunction solar cell; solar concentrator
Series Name:Proceedings of SPIE
Issue or Number:8821
Record Number:CaltechAUTHORS:20131114-112832608
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131114-112832608
Official Citation:Carissa N. Eisler ; Emily D. Kosten ; Emily C. Warmann and Harry A. Atwater " Polyhedral specular reflector design for ultra high spectrum splitting solar module efficiencies (>50%) ", Proc. SPIE 8821, High and Low Concentrator Systems for Solar Electric Applications VIII, 88210B (October 7, 2013); doi:10.1117/12.2024288
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42456
Collection:CaltechAUTHORS
Deposited By: Ignis Nguyen
Deposited On:15 Nov 2013 18:11
Last Modified:09 Mar 2020 13:19

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