Scalable non-fused wide band gap π-conjugated polymers for fullerene-free organic solar cells
Kakaraparthi Kranthiraja a, Akinori Saeki a
a Department of Applied Chemistry, Graduate school of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Poster, Kakaraparthi Kranthiraja, 129
Publication date: 23rd October 2018

Recently, with the emergence of non-fullerene acceptors (NFAs), wide band gap (WBG) polymer donors have attracted much attention again in recent years. The great features like complementary absorption, tunable electronic energy levels, and well-matched charge carrier mobilities of WBG polymers with NFAs resulted in high photovoltaic performance. In this regard, herein, we designed and synthesized two new sets of scalable wide band gap p-conjugated polymers (P1 and P2) with non-fused alkoxy and alkylthiophene substituted phenylenedithiophene (A-PhDT, ATh-PhDT) units and compared with the standard alkyl and alkylthiophene linked benzodithiophene (A-BDT and ATh-BDT) p-conjugated polymers (R1 and R2). The density functional theory studies revealed that P1 and P2 have significantly varied optoelectronic properties compared with the references (R1 and R2). Currently, optimization of molecular structure and solar cell fabrications are underway in our laboratory. Overall, the rational approach provides a new feasible approach to develop scalable photoactive materials for fullerene-free OSCs towards their practical use.

This work was supported by the Japan Society for the Promotion of Science (JSPS)

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