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A high dielectric constant non-fullerene acceptor for efficient bulk-heterojunction organic solar cells

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Abstract

The majority of organic semiconductors have a low relative dielectric constant (εr < 6), which is an important limitation for organic solar cells (OSCs). A high dielectric constant would reduce the exciton binding energy, reduce charge carrier recombination losses, and thereby enhance the overall device performance of OSCs. However, the development of organic/polymeric semiconductors with higher relative dielectric constants (εr > 6) has attracted a very limited attention. Moreover, high performance OSCs based on high dielectric constant photovoltaic materials are still in their infancy. Herein, we report an oligoethylene oxide side chain-containing non-fullerene acceptor (ITIC-OE) with a high relative dielectric constant of εr ≈ 9.4, which is two times larger than that of its alkyl chain-containing counterpart ITIC. Encouragingly, the OSCs based on ITIC-OE show a high power conversion efficiency of 8.5%, which is the highest value for OSCs that employ high dielectric constant materials. Nevertheless, this value is lower than those of ITIC-based control devices. The less phase-separated morphology in blend films due to the reduced crystallinity of ITIC-OE and the too good miscibility between PBDB-T and ITIC-OE are responsible for the lower device performance. This work suggests additional prerequisites to make high dielectric constants play a significant role in OSCs.

Graphical abstract: A high dielectric constant non-fullerene acceptor for efficient bulk-heterojunction organic solar cells

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Publication details

The article was received on 17 Nov 2017, accepted on 29 Nov 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA10136H
Citation: J. Mater. Chem. A, 2018, Advance Article
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    A high dielectric constant non-fullerene acceptor for efficient bulk-heterojunction organic solar cells

    X. Liu, B. Xie, C. Duan, Z. Wang, B. Fan, K. Zhang, B. Lin, F. J. M. Colberts, W. Ma, R. A. J. Janssen, F. Huang and Y. Cao, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA10136H

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