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Photovoltaic properties of benzotriazole containing alternating donor–acceptor copolymers: Effect of alkyl chain length
Date
2012-12
Author
Baran, Derya
Balan, Abidin
Stubhan, Tobias
Ameri, Tayebeh
Toppare, Levent Kamil
Brabec, Christoph J.
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A series of variable alkyl chain length substituted donor-acceptor (D-A) conjugated polymers with thiophene ring as the donor and benzotriazole moiety as the acceptor has been investigated in bulk heterojunction solar cells. The optical and electrochemical properties showed that the absorption onsets and the energy levels of the copolymers were not affected by alkyl substitution revealing 1.9 eV of optical band gap. The morphologies of the blend film can be fine-tuned by increasing the chain length attached to the benzotriazole unit. Photovoltaic devices were fabricated using (6,6)-phenyl-C-61-butyric acid methyl ester (PC60BM) and (6,6)-phenyl-C-71-butyric acid methyl ester (PC70BM) as the acceptors. The maximum performance was achieved with a V-oc, of 0.75V, J(sc) of 3.70 mA/cm(2), FF of 45% and a PCE of 1.23% for the PTBT-DA10:PC70BM device using 1:4 w/w ratio in chlorobenzene (CB).
Subject Keywords
Benzotriazole
,
Effect of chain length
,
Organic photovoltaics
,
Solar cell
,
Donor–acceptor polymers
URI
https://hdl.handle.net/11511/28289
Journal
Synthetic Metals
DOI
https://doi.org/10.1016/j.synthmet.2012.09.017
Collections
Department of Chemistry, Article
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D. Baran, A. Balan, T. Stubhan, T. Ameri, L. K. Toppare, and C. J. Brabec, “Photovoltaic properties of benzotriazole containing alternating donor–acceptor copolymers: Effect of alkyl chain length,”
Synthetic Metals
, pp. 2047–2051, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28289.