Issue 22, 2022

The effects of the side-chain length of non-fullerene acceptors on their performance in all-small-molecule organic solar cells

Abstract

A series of acceptor–donor–acceptor type non-fullerene acceptors (NFAs), FCn-2Cl, with gradient substitution lengths of side chains (SCs) on molecular backbones, have been designed and synthesized for all-small-molecule organic solar cells (ASM-OSCs). The effects of SC length ranging from n-butyl to n-dodecyl on their optoelectronic properties, molecular packing, blend film morphology and overall photovoltaic performance have been systematically studied. Our results show that the BSFTR:FC10-2Cl-based ASM-OSC exhibited the best power conversion efficiency of over 12% due to its more efficient exciton dissociation, less charge recombination, balanced charge mobility and favorable morphology. Our work highlights the importance of fine-tuning the length of SCs of NFAs for further improving the performance of ASM-OSCs.

Graphical abstract: The effects of the side-chain length of non-fullerene acceptors on their performance in all-small-molecule organic solar cells

Supplementary files

Article information

Article type
Paper
Submitted
20 Mar 2022
Accepted
10 May 2022
First published
10 May 2022

J. Mater. Chem. C, 2022,10, 8719-8727

The effects of the side-chain length of non-fullerene acceptors on their performance in all-small-molecule organic solar cells

F. Huang, L. Meng, C. Jiang, H. Liang, Y. Yang, J. Wang, X. Wan, C. Li, Z. Yao and Y. Chen, J. Mater. Chem. C, 2022, 10, 8719 DOI: 10.1039/D2TC01131J

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