Design principles for block polymer organic double heterojunction solar cellsElectronic supplementary information (ESI) available. See DOI: 10.1039/c6mh00293e

An organic double heterojunction photovoltaic device is described and the limits of its power conversion efficiency are investigated via numerical calculations. In the absence of exciton binding energy, fully conjugated block polymer devices exhibit power conversion efficiencies slightly exceeding t...

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Bibliographic Details
Main Authors Hutnan, M. P. J, Kaake, L. G
Format Journal Article
LanguageEnglish
Published 24.10.2016
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Summary:An organic double heterojunction photovoltaic device is described and the limits of its power conversion efficiency are investigated via numerical calculations. In the absence of exciton binding energy, fully conjugated block polymer devices exhibit power conversion efficiencies slightly exceeding the Shockley-Queisser limit. As exciton binding energy increases, a decrease in efficiency occurs, but remains over 20% for binding energies less than 0.5 eV. Further calculations show that devices require a high degree of phase purity to leverage the full benefit of the double heterojunction structure. Synthetic targets are identified and their maximum efficiency is calculated based on experimentally measured energy levels, leading to a generalized structural motif. Calculations provide evidence that a double heterojunction structure could radically improve the efficiency of organic solar cells. Practical guidelines for implementing this structure are outlined here.
Bibliography:10.1039/c6mh00293e
Electronic supplementary information (ESI) available. See DOI
ISSN:2051-6347
2051-6355
DOI:10.1039/c6mh00293e