New Low Bandgap Near-IR Conjugated D-A Copolymers for BHJ Polymers for Solar Cell Applications

Alexander Nikolaev^a, Ilya Ostapov^a, Igor Konstantinov^a, Sergey Kuklin^a, Mukhamed Keshtov^a, Dmitry Godovsky^a, Nikolay Radychev^b, Mikhail Krayushkin^c, Emmanuel Koukaras^d, Ganesh Sharma^e, Fang-Chung Chen^f

^aA.N.Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (RAS), 28, Vavilova street, Moscow, 119991, Russian Federation

^bCarl von Ossietzky University of Oldenburg, 26129, Oldenburg, Germany, Georgia

^cInstitute of Organic Chemistry of the Russian Academy of Sciences, Leninsky prospect 47, 119991 Moscow, Russian Federation, Russian Federation

^dMolecular Engineering Laboratory, Department of Physics, University of Patras, Patras, 26500 GR, Greece, Greece

^eDepartment of physics, The LNM Institute of Information Technology, Jamdoli, Jaipur (Raj.) 302031, India., India

^fNational Chiao Tung University Hsinchu, Taiwan, 1001 University Road, Hsinchu, Hsinchu, Taiwan, Republic of China

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)

Swansea, United Kingdom, 2016 June 29th - July 1st

Organizers: James Durrant, Henry Snaith and David Worsley

Poster, Alexander Nikolaev, 282
Publication date: 28th March 2016

We synthesized two novel ultralow bandgap donor-acceptor (D-A) copolymers (Eg≤1.2 eV), containing the thiadiazoloquinoxaline unit as the main electron accepting unit (A) and benzodithiophene (BDT) and dithienosilole (DTS) as different donor units (D), denoted as P1 and P2, respectively, by cross-coupling Stille reaction. The copolymers possess a light absorption range from UV (350 nm) to near-IR (1300 nm) with optical bandgaps 1.16 eV and 1.08 eV, respectively. Comparisons between quantum-chemical calculations with experimental data were performed for proposing more detailed conception of the optical and electronic properties of these copolymers. These copolymers were employed as donor materials for the bulk heterojunction polymer solar cells (PSCs). The PSCs based on optimized P1:PC₇₁BM and P2:PC₇₁BM showed overall power conversion efficiency of 4.32 and 3.48 %, respectively. Although the P2 possess broad absorption coverage up to 1300 nm, the lower PCE may be attributed to the low Jsc, due to the poor driving force for exciton dissociation, since the LUMO offset with PC₇₁BM is less than 0.3 eV. The PCE has been significantly increased to 7.27% and 6.68% for solvent vapor annealing (SVA) treated P1:PC₇₁BM and P2:PC₇₁BM active layers, respectively. This improvement arises from the appropriate nanoscale morphology and increase in hole mobility, induced by SVA treatment of the active layer.

Acknowledgements. M.L.K., D.Yu.G., S.A.K., I.E.O., N.A.R. and A.Yu.N. would like to thank Russian Foundation for Basic Research (grant NNS_a 14-03-92003) for financial support.

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