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Optoelectronic design of multijunction wire-array solar cells

Turner-Evans, Daniel B. and Kelzenberg, Michael D. and Chen, Chris T. and Warmann, Emily C. and Tamboli, Adele C. and Atwater, Harry A. (2011) Optoelectronic design of multijunction wire-array solar cells. In: 2011 37th IEEE Photovoltaic Specialists Conference. IEEE , Piscataway, NJ, pp. 2669-2673. ISBN 9781424499656. http://resolver.caltech.edu/CaltechAUTHORS:20190307-092212032

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Abstract

Microwire solar cells have demonstrated promising optical and photovoltaic performance in arrays of single junction Si wires. Seeking higher efficiencies, we have numerically investigated III-V on Si_(1-x)Ge_x architectures as candidates for tandem microwire photovoltaics via optical and electronic transport modeling. Optical modeling indicates that light trapping is an important design criterion. Absorption is more than doubled by the presence of Al2O3 scattering particles around the wires, leading to high overall light collection despite low wire packing fraction. Texturing of the microwire outer surface, which was found to occur experimentally for GaP/Si microwires, is also shown to enhance absorption by over 50% relative to wires with smooth surfaces, allowing for the use of thinner layers. Finally, full optoelectronic simulations of GaAs on Ge structures revealed that current matching is attainable in these structures and that wire device efficiencies can approach those of planar cells.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/pvsc.2011.6186497DOIArticle
ORCID:
AuthorORCID
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2011 IEEE. The author would like to thank Michael G. Deceglie and Nick Strandwitz for useful discussion. Support for this work was provided by DARPA (D.B.T-E., A.T.) and the Department of Energy Basic Energy Sciences, Office of Science through the Light Material Interactions Energy Frontier Research Center under contract number DE-SC0001293 (MDK and HAA). D.B.T-E. acknowledges the NSF for fellowship support.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Department of Energy (DOE)DE-SC0001293
NSF Graduate Research FellowshipUNSPECIFIED
Record Number:CaltechAUTHORS:20190307-092212032
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190307-092212032
Official Citation:D. B. Turner-Evans, M. D. Kelzenberg, C. T. Chen, E. C. Warmann, A. C. Tamboli and H. A. Atwater, "Optoelectronic design of multijunction wire-array solar cells," 2011 37th IEEE Photovoltaic Specialists Conference, Seattle, WA, 2011, pp. 002669-002673. doi: 10.1109/PVSC.2011.6186497
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93614
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:08 Mar 2019 15:51
Last Modified:08 Mar 2019 15:51

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