Alternating D-A1-D-A2 Copolymers Containing Two Electron-Acceptor Structures as An Effective Approach for Development of Novel Polymers with a Low Bandgap and Wider Effective Absorption Range for Polymer Solar Cells

Sergey Osipov, Ilya Ostapov, Salekh Masoud, Artemi Gamov, Mukhamed Keshtov, Alexander Nikolaev, Sergey Kuklin, Nikolay Radychev, Emmanuel Koukaras, Ganesh Sharma, Abhishek Sharma

^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

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

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

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, Mukhamed Keshtov, 283
Publication date: 28th March 2016

Two low bandgap D-A1-D–A conjugated copolymers, namely P1 (non-fluorine substituted thiadiazoloquinoxaline A2) and P2 fluorine substituted thiadiazoloquinoxaline A2) with same D (thiophene) and A1 (benzothiadiazole) were synthesized, in order to investigate the effect of fluorine atoms on the photovoltaic performance of polymer solar cells and their optical and electrochemical properties (both experimental and theoretical) were investigated in detail. The electrochemical properties demonstrate that the highest occupied molecular orbital (HOMO) energy level lowered from 5.08 eV (for P1) to 5.16 eV (for P2), whereaslowest occupied molecular orbital (LUMO) energy levels nearly remain. These copolymers showed strong absorption in the wavelength range 300-1100 nm and bandgap of around 1.08 -1.11 eV.After the optimization of weight ratio and concentration of solvent additives (CN), the highest power conversion efficiencies of bulk heterojunction polymer solar cells achieved up to 5.30 % and 7.21 % for P1 and P2 as donor and PC₇₁BM as acceptor. The enhanced V_oc and J_sc for P2 based device can be mainly ascribed to the lower HOMO energy levels and higher hole mobility of the fluorinated copolymer (P2), as well as the better morphology of the fluorinated copolymer donor with a PC₇₁BM acceptor.

Acknowledgements. M.L.K., D.Yu.G., S.A.K., I.E.O., S.N.O, S.M.M., A.L.G., N.A.R. and A.Yu.N. thank Russian Science Foundation (grant number 14-13-01444) for financial support.

Key words: Low bandgap copolymers, substitution of fluorine atom, bulk heterojunction solar cells, solvent additives.

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