Ram, D., Suman, A., Bagui, A. S., Sharma, R., Gupta, V., Yoo, S., Kumar, S. and Singh, S. P. (2019) Effectiveness of Solvent Vapor Annealing over Thermal Annealing on the Photovoltaic Performance of Non-Fullerene Acceptor Based BHJ Solar Cells. Scientific Reports, 9, 8529. (doi: 10.1038/s41598-019-44232-0) (PMID:31189940) (PMCID:PMC6561915)
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Abstract
We explore two small molecules containing arms of dicyano-n-hexylrhodanine and diathiafulvalene wings terminated with benzothiadiazole linker, denoted as BAF-4CN and BAF-2HDT, respectively, as small molecule non-fullerene acceptors (SMNFAs) in organic solar cells. The proposed materials are mixed with a low band gap polymer donor PTB7-Th having broad absorption in the range of 400–750 nm to form solution-processed bulk heterojunctions (BHJs). The photoluminescence (PL) measurements show that both donor and acceptor can quench each other’s PL effectively, implying that not only electrons are transferred from PTB7-Th → SMNFAs but also holes are transferred from SMNFAs → PTB7-Th for efficient photocurrent generation. Furthermore, solvent vapor annealing (SVA) processing is shown to yield a more balanced hole and electron mobility and thus suppresses the trap-assisted recombination significantly. With this dual charge transfer enabled via fine-tuning of end-groups and SVA treatment, power conversion efficiency of approximately 10% is achieved, demonstrating the feasibility of the proposed approach.
Item Type: | Articles |
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Additional Information: | S.P.S. thanks DST Indo-Poland project DST/INT/POL/P-26/2016. Suman is grateful to UGC for her fellowship. IICT Communication Number: IICT/Pubs./2019/170. |
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Kumar, Professor Shanmugam |
Authors: | Ram, D., Suman, A., Bagui, A. S., Sharma, R., Gupta, V., Yoo, S., Kumar, S., and Singh, S. P. |
College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
Journal Name: | Scientific Reports |
Publisher: | Nature Research |
ISSN: | 2045-2322 |
ISSN (Online): | 2045-2322 |
Copyright Holders: | Copyright © The Author(s) 2019 |
First Published: | First published in Scientific Reports 9:8529 |
Publisher Policy: | Reproduced under a Creative Commons Licence |
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