Issue 48, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
13 Oct 2019
Accepted
18 Nov 2019
First published
20 Nov 2019

J. Mater. Chem. A, 2019,7, 27632-27639

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, 7, 27632 DOI: 10.1039/C9TA11285E

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