Issue 21, 2023

Side-chain modification of non-fullerene acceptors for organic solar cells with efficiency over 18%

Abstract

Three non-fullerene acceptors BTP-OC4, BTP-OC6 and BTP-OC8 with different 4-alkyloxyphenyl side-chains were designed and synthesized through a new synthetic route without organotin reagent. The length of the alkyloxy attached to the benzene ring has no influence on the energy levels and absorption of these small-molecular acceptors. However, the active layer morphology is modulated by the different crystallinity caused by the different chain's length. Among them, the device based on the PM6:BTP-OC6 system exhibited the lowest energy loss of 0.513 eV and the highest power conversion efficiency (PCE) of 17.59%, as well as excellent photo-soaking/thermal/storage stability. Moreover, when Y6 was introduced into PM6:BTP-OC6 to fabricate a ternary device, the PCE was promoted to over 18%. Our results provide a feasible strategy to develop high-performance acceptors through fine tuning the aromatic side chain, which can be easily realized by our reported synthetic route.

Graphical abstract: Side-chain modification of non-fullerene acceptors for organic solar cells with efficiency over 18%

Supplementary files

Article information

Article type
Paper
Submitted
06 Mar 2023
Accepted
20 Apr 2023
First published
21 Apr 2023

J. Mater. Chem. C, 2023,11, 6920-6927

Side-chain modification of non-fullerene acceptors for organic solar cells with efficiency over 18%

Z. Li, C. Jiang, X. Chen, G. Song, X. Wan, B. Kan, T. Duan, E. A. Knyazeva, O. A. Rakitin and Y. Chen, J. Mater. Chem. C, 2023, 11, 6920 DOI: 10.1039/D3TC00820G

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