Near infrared electron acceptors with a photoresponse beyond 1000 nm for highly efficient organic solar cells

Chengliang He; Yaokai Li; Yanfeng Liu; Yuhao Li; Guanqing Zhou; Shuixing Li; Haiming Zhu; Xinhui Lu; Fengling Zhang; Chang-Zhi Li; Hongzheng Chen

doi:10.1039/D0TA06907H

Near infrared electron acceptors with a photoresponse beyond 1000 nm for highly efficient organic solar cells†

Chengliang He,‡^a Yaokai Li,‡^a Yanfeng Liu,^b Yuhao Li,^c Guanqing Zhou,^d Shuixing Li,^a Haiming Zhu,^e Xinhui Lu,

^c Fengling Zhang,

^b Chang-Zhi Li

*^a and Hongzheng Chen

*^a

Author affiliations

* Corresponding authors

^a State Key Laboratory of Silicon Materials, MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
E-mail: czli@zju.edu.cn, hzchen@zju.edu.cn

^b Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping 58183, Sweden

^c Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong 999077, P. R. China

^d School of Chemistry and Chemical Engineering Center for Advanced Electronic Materials and Devices, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

^e Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China

Abstract

Developing near infrared (NIR) organic semiconductors is indispensable for promoting the performance of organic solar cells (OSCs), but addressing the trade-off between voltage and current density thus achieving high efficiency with low energy loss is still an urgent challenge. Herein, NIR acceptors (H1, H2 and H3) with a photoresponse beyond 1000 nm were developed by conjugating dithienopyrrolobenzothiadiazole to 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile via varied alkyl thiophene bridges. It was found that the linear outward chains in thiophene bridges could mitigate both the conformation disorder of H3 and the electronic disorder of the PBDB-T:H3 blends, which could help to form a favorable blend morphology, facilitating highly efficient photoelectric conversion in the resultant OSCs. As a result, devices based on PBDB-T:H3 achieve a high efficiency of 13.75% with a low energy loss of 0.55 eV, which is one of the highest efficiencies and the lowest energy loss among OSCs with an optoelectronic response near 1000 nm. This work provides a new design strategy towards NIR acceptors for efficient OSCs and future exploration of functional optoelectronics.

Journal of Materials Chemistry A

Near infrared electron acceptors with a photoresponse beyond 1000 nm for highly efficient organic solar cells†

Abstract

Supplementary files

Article information

Download Citation

Permissions

Near infrared electron acceptors with a photoresponse beyond 1000 nm for highly efficient organic solar cells

Social activity

Search articles by author

Spotlight

Advertisements