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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Citation Formats

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.