Issue 14, 2023

Terthiophene based low-cost fully non-fused electron acceptors for high-efficiency as-cast organic solar cells

Abstract

Fully non-fused electron acceptors (FNEAs) have shown a promising prospect for commercial applications of organic solar cells (OSCs) due to their simple structures and low costs. Herein, two terthiophene-based NFEAs 3T-1 and 3T-2 were exploited from a single thiophene ring as the starting material. Octyl substituted 3T-1 exhibits strong crystallinity, poor miscibility, and forms large aggregates when blending with polymer D18, leading to an inferior power conversion efficiency (PCE). While 2-ethylhexyl substituted 3T-2 possesses good solubility and enhanced compatibility with polymer D18, the blend film exhibits an appropriate morphology, face-on molecular orientation, and efficient charge transport. As a result, the as-cast device based on 3T-2 exhibits a significantly enhanced PCE of 11.12% processed by non-halogenated o-xylene as the solvent, which is the highest value of terthiophene based FNEAs for OSCs so far. Our work provides insight into molecular design of FNEAs for high-performance OSCs.

Graphical abstract: Terthiophene based low-cost fully non-fused electron acceptors for high-efficiency as-cast organic solar cells

Supplementary files

Article information

Article type
Paper
Submitted
20 1 2023
Accepted
06 3 2023
First published
07 3 2023

J. Mater. Chem. A, 2023,11, 7498-7504

Terthiophene based low-cost fully non-fused electron acceptors for high-efficiency as-cast organic solar cells

Y. Zhou, P. Liu, S. Shen, M. Li, R. Qin, X. Tang, C. Qin, J. Song, Z. Bo and L. Zhang, J. Mater. Chem. A, 2023, 11, 7498 DOI: 10.1039/D3TA00372H

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