An efficient binary cathode interlayer for large-bandgap non-fullerene organic solar cells

Qingwu Yin; Kai Zhang; Long Zhang; Jianchao Jia; Xi Zhang; Shuting Pang; Qing-Hua Xu; Chunhui Duan; Fei Huang; Yong Cao

doi:10.1039/C9TA02844G

An efficient binary cathode interlayer for large-bandgap non-fullerene organic solar cells†

Qingwu Yin,^a Kai Zhang,

*^a Long Zhang,^a Jianchao Jia,^a Xi Zhang,^a Shuting Pang,^a Qing-Hua Xu,

^b Chunhui Duan,

*^a Fei Huang

*^a and Yong Cao^a

Author affiliations

* Corresponding authors

^a Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China
E-mail: mszhangk@scut.edu.cn, duanchunhui@scut.edu.cn, msfhuang@scut.edu.cn

^b Department of Chemistry, National University of Singapore, Singapore

Abstract

With the rapid development in large-bandgap non-fullerene acceptors, the energy level mismatch between the cathode interlayer (CIL) and the acceptors becomes severe. Herein, we carefully investigate the influence of interlayers with different lowest unoccupied molecular orbital (LUMO) levels on the performance of non-fullerene organic solar cells (OSCs), and observe that the energy level alignment between interlayers and acceptors plays a crucial role in achieving high open circuit voltage (V_oc) and efficient charge extraction. Meanwhile, we find that the electron extraction and transport abilities of the CIL can be tuned by blending two CIL materials together with different ratios (named binary CIL). Based on these findings, efficient single-junction, double-junction and triple-junction homo-tandem OSCs based on a large-bandgap non-fullerene acceptor and binary CIL with an ultrahigh V_oc of 1.22 V, 2.39 V and 3.21 V are demonstrated. The high V_oc of tandem OSCs further ensure their application in solar-energy-driven water splitting. This study offers a new strategy to extend the application of CILs, and helps to develop efficient and thick CILs for printed large-area non-fullerene OSCs.

Journal of Materials Chemistry A

An efficient binary cathode interlayer for large-bandgap non-fullerene organic solar cells†

Abstract

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An efficient binary cathode interlayer for large-bandgap non-fullerene organic solar cells

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