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Tuning terminal aromatics of electron acceptors to achieve high-efficiency organic solar cells

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Abstract

Herein, two new electron acceptors, BTTPC and BTTPC-Br, are developed through extending the conjugation of terminal electron accepting moieties with thiophene and bromine units. Such a structural design effectively improves the hole transfer of exciton dynamics in blends, revealing that BTTPC-Br and BTTPC based blends, in the presence of a smaller energetic offset as a driving force, exhibit faster hole transfer from acceptors to the polymeric donor interface, 4 times (BTTPC-Br) and 1.5 times (BTTPC) faster than 0.44 picoseconds of unmodified Y5. As a result, organic solar cells (OSCs) based on the BTTPC-Br acceptor, outperforming those of BTTPC:PBDB-T and Y5:PBDB-T, reach a power conversion efficiency of 15.22%, which is so far one of the highest among the single junction OSCs made with PBDB-T polymer donor.

Graphical abstract: Tuning terminal aromatics of electron acceptors to achieve high-efficiency organic solar cells

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Publication details

The article was received on 13 Oct 2019, accepted on 18 Nov 2019 and first published on 20 Nov 2019


Article type: Paper
DOI: 10.1039/C9TA11285E
J. Mater. Chem. A, 2019, Advance Article

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    Tuning terminal aromatics of electron acceptors to achieve high-efficiency organic solar cells

    R. Qin, D. Wang, G. Zhou, Z. Yu, S. Li, Y. Li, Z. Liu, H. Zhu, M. Shi, X. Lu, C. Li and H. Chen, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA11285E

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