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Fullerene-free polymer solar cells with highly reduced bimolecular recombination and field-independent charge carrier generation

  • Photogeneration, recombination, and transport of free charge carriers in all-polymer bulk heterojunction solar cells incorporating poly(3-hexylthiophene) (P3HT) as donor and poly([N,N'-bis(2-octyldodecyl)-naphthelene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)) (P(NDI2OD-T2)) as acceptor polymer have been investigated by the use of time delayed collection field (TDCF) and time-of-flight (TOF) measurements. Depending on the preparation procedure used to dry the active layers, these solar cells comprise high fill factors (FFs) of up to 67%. A strongly reduced bimolecular recombination (BMR), as well as a field-independent free charge carrier generation are observed, features that are common to high performance fullerene-based solar cells. Resonant soft X-ray measurements (R-SoXS) and photoluminescence quenching experiments (PQE) reveal that the BMR is related to domain purity. Our results elucidate the similarities of this polymeric acceptor with the superior recombination properties of fullerene acceptors.

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Author:Steffen RolandORCiDGND, Marcel Schubert, Brian A. Collins, Jona Kurpiers, Zhihua Chen, Antonio Facchetti, Harald W. Ade, Dieter NeherORCiDGND
ISSN:1948-7185 (print)
Pubmed Id:http://www.ncbi.nlm.nih.gov/pubmed?term=26278084
Parent Title (English):The journal of physical chemistry letters
Publisher:American Chemical Society
Place of publication:Washington
Document Type:Article
Year of first Publication:2014
Year of Completion:2014
Release Date:2017/03/27
First Page:2815
Last Page:2822
Funder:Federal Ministry of Education and Research (BMBF) [FKZ 031 S2151D]; German Science Foundation (DFG) [SPP 1355]; U.S. Department of Energy, Office of Science, Basic Energy Science, Division of Materials Science and Engineering [DE-FG02-98ER45737]; U.S. Department of Energy [DE-AC02-05CH1123]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert