New DPP and Selenophene based NIR Absorbing Polymers for Organic Solar Cell Applications

Date

2018-07-06

Author

Günbaş, Emrullah Görkem
Toppare, Levent Kamil
Oklem, Gulce

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The broad spectrum of sunlight which spans from 300 nm to 1200 nm cannot be effectively utilized in organic solar cells since most organic polymers have absorption between 300 ve 800 nm range. Recently coppolymers from diketopyrrolopyrrole (DPP) and simple donors such as thiophene and furan was shown to achieve absorption maxima around 800 nm. Here we shown that DPP coupled with selenophene pushes the absorption even futher and a polymer with absorption maxima at 830 nm (absorption onset 930 nm) could be attained. This polymer, under optimized conditions, shown a maximum conversion efficiency of 6.16% with inverted device structure using PC71BM as the electron acceptor. A significant additive effect was also observed where the device efficiencies were improved over 13-fold. EQE studies showed that there is strong contribution in the NIR region with 40% EQE achieved in the range of 700 nm to 850 nm (Figure 1). This material is also one of the rare examples of a high performance NIR absorbing polymer that does not contain any thiophene-based unit in its backbone. Synthetic efforts towards other related derivatives are currently being investigated.

Subject Keywords

NIR polymers, Organic solar cells, Additive effect

URI

http://pvcon.org/arrival-guide/
https://hdl.handle.net/11511/76157
http://pvcon.org/wp-content/uploads/2019/09/Abstract-Book-PVCON2018.pdf

Conference Name

International Conference on Photovoltaic Science and Technologies, (4 - 06 July 2018)

Collections

Department of Chemistry, Conference / Seminar

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Citation Formats

E. G. Günbaş, L. K. Toppare, and G. Oklem, “New DPP and Selenophene based NIR Absorbing Polymers for Organic Solar Cell Applications,” presented at the International Conference on Photovoltaic Science and Technologies, (4 - 06 July 2018), Ankara, Türkiye, 2018, Accessed: 00, 2021. [Online]. Available: http://pvcon.org/arrival-guide/.