Title: Balance between light trapping and charge carrier collection : electro-photonic optimization of organic photovoltaics with ridge-patterned back electrodes
Authors : Liu, Yingchi
Tippets, Cary A.
Kirsch, Christoph
Mitran, Sorin
Samulski, Edward T.
Lopez, Rene
Published in : Journal of Applied Physics
Volume(Issue) : 113
Issue : 24
Publisher / Ed. Institution : American Institute of Physics
Issue Date: 2013
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
Language : English
Subject (DDC) : 621.3: Electrical engineering and electronics
Abstract: Light trapping strategies are frequently suggested to improve organic photovoltaic (OPV) cell efficiencies. However, one cannot overlook the side-effects to charge carrier collection which are introduced when seeking optical enhancements. A comprehensive electro-photonic model is utilized to study the optical and electrical effects of patterning poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] and poly(3-hexylthiophene) based solar cells with simple optical grating structures. It is found that for the most part, optical absorption improvements are attenuated by enhanced electrical losses. Optimized device structures that overcome this tradeoff are proposed and their detailed electro-optical characteristics are discussed. When the hole mobility is smaller than the electron mobility, the results suggest that in general, an inverted structure has a better chance to outperform a flat active layer than a conventional architecture in an OPV cell with the ridge-patterned back electrode.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific journal
DOI : 10.1063/1.4812235
ISSN: 0021-8979
URI: https://digitalcollection.zhaw.ch/handle/11475/12352
Appears in Collections:Publikationen School of Engineering

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