Issue 29, 2020

An asymmetrical fused-ring electron acceptor designed by a cross-conceptual strategy achieving 15.6% efficiency

Abstract

Due to their unique merits, asymmetrical fused-ring electron acceptors (FREAs) have received increasing attention in the field of organic photovoltaics (OPVs). Herein, we designed and synthesized an asymmetrical FREA, namely AY6, by employing a cross-conceptual strategy which combines the structural features of asymmetrical IT6-4F with high-performance Y6. Compared to Y-shape Y6, X-shape AY6 shows poor crystallization properties and thus a significantly blue-shifted absorption. However, it is precisely because of this unfavorable self-stacking effect that AY6 has an opportunity to pack with PM6 and form a new intermixed phase. As a result, the PM6:AY6 blend film exhibits a perfect face-on orientation with stronger π–π stacking than the PM6:Y6 blend film, which facilitates efficient exciton dissociation and balanced carrier transport, and therefore higher FF. In general, such a cross-conceptual design strategy is an effective method which not only boosts the efficiency of asymmetrical FREA-based OSCs but also increases the fill factors of OSCs based on Y6-like FREAs.

Graphical abstract: An asymmetrical fused-ring electron acceptor designed by a cross-conceptual strategy achieving 15.6% efficiency

Supplementary files

Article information

Article type
Paper
Submitted
12 Apr 2020
Accepted
30 Jun 2020
First published
01 Jul 2020

J. Mater. Chem. A, 2020,8, 14583-14591

An asymmetrical fused-ring electron acceptor designed by a cross-conceptual strategy achieving 15.6% efficiency

W. Gao, X. Ma, Q. An, J. Gao, C. Zhong, F. Zhang and C. Yang, J. Mater. Chem. A, 2020, 8, 14583 DOI: 10.1039/D0TA03985C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements