Issue 3, 2020

Improving the performance of near infrared binary polymer solar cells by adding a second non-fullerene intermediate band-gap acceptor

Abstract

The strategy of using ternary blends for the active layer becomes increasingly important in single-junction organic solar cells (OSCs), particularly for boosting the performance of high-performance non-fullerene-based devices. In this work, a non-fullerene small molecule named IT-4F with a moderate bandgap (1.58 eV) is introduced as the third component into the PBDB-T-2Cl:IXIC-4Cl binary blend, where IXIC-4Cl is a low-bandgap acceptor with absorption up to ∼1000 nm. Compared to the 11.99% and 13.47% efficiencies for the binary devices based on PBDB-T-2Cl:IXIC-4Cl and PDBD-T-2Cl:IT-4F, respectively, the ternary OSCs achieve a power conversion efficiency (PCE) of 14.96% when the weight ratio of PBDB-T-2Cl:IXIC-4Cl:IT-4F is 1.0 : 0.3 : 0.7. Through device and film characterization, IT-4F is shown to be an effective third component with functionalities including modulating the electronic properties, adjusting the frontier orbital energy levels, complementing the absorption spectrum and improving the active-layer morphology, which lead to significantly increased open-circuit voltage (VOC), short-circuit current (JSC) and fill factor (FF). Our method could be employed as a general approach to enhance the performance of nonfullerene OSCs based on low-bandgap small molecule acceptors.

Graphical abstract: Improving the performance of near infrared binary polymer solar cells by adding a second non-fullerene intermediate band-gap acceptor

Supplementary files

Article information

Article type
Communication
Submitted
20 stu 2019
Accepted
13 pro 2019
First published
17 pro 2019

J. Mater. Chem. C, 2020,8, 909-915

Improving the performance of near infrared binary polymer solar cells by adding a second non-fullerene intermediate band-gap acceptor

R. Ma, Y. Chen, T. Liu, Y. Xiao, Z. Luo, M. Zhang, S. Luo, X. Lu, G. Zhang, Y. Li, H. Yan and K. Chen, J. Mater. Chem. C, 2020, 8, 909 DOI: 10.1039/C9TC06362E

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