Datt, Ram and -, Suman and Bagui, A. and Siddiqui, Afzal and Sharma, R. and Gupta, Vinay and Yoo, S. and Kumar, S. and Singh, Surya Prakash
(2019)
Effectiveness of Solvent Vapor Annealing over Thermal Annealing on the Photovoltaic Performance of Non-Fullerene Acceptor Based BHJ Solar Cells.
Scientific Reports, 9.
pp. 8529-8538.
ISSN 2045-2322
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: |
Article
|
| Additional Information: |
Copyright for this article belongs to M/s Nature Publishing Group. |
| Subjects: |
Multidisciplinary |
| Divisions: |
UNSPECIFIED |
| Depositing User: |
Mr. Yogesh Joshi
|
| Date Deposited: |
02 Mar 2020 11:37 |
| Last Modified: |
02 Mar 2020 11:37 |
| URI: |
http://npl.csircentral.net/id/eprint/4163 |
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