Cathode interfacial layer-free all small-molecule solar cells with efficiency over 12%

Hao Wu; Qihui Yue; Zichun Zhou; Shanshan Chen; Dongyang Zhang; Shengjie Xu; Huiqiong Zhou; Changduk Yang; Haijun Fan; Xiaozhang Zhu

doi:10.1039/C9TA05023J

Cathode interfacial layer-free all small-molecule solar cells with efficiency over 12%†

Hao Wu,‡^ab Qihui Yue,

‡^ab Zichun Zhou,^ab Shanshan Chen,^cd Dongyang Zhang,^e Shengjie Xu,^a Huiqiong Zhou,

^e Changduk Yang,^c Haijun Fan

*^a and Xiaozhang Zhu

*^ab

Author affiliations

* Corresponding authors

^a Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
E-mail: fanhai2008@iccas.ac.cn, xzzhu@iccas.ac.cn

^b Department of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

^c Department of Energy Engineering, School of Energy and Chemical Engineering, Perovtronics Research Center, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan 44919, South Korea

^d MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, CQU-NUS Renewable Energy Materials & Devices Joint Laboratory, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China

^e CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China

Abstract

While nonfullerene small-molecule solar cells (NF-SMSCs) have relatively inferior performance compared with nonfullerene polymer solar cells, their performance is improving. In this work, a weak crystalline molecular donor BSFTR, was designed and synthesized to achieve efficient NF-SMSCs. By blending with a strong crystalline acceptor NBDTP-F_out, BSFTR achieves a well-intermixed blending morphology, which favors the formation of efficient charge percolation pathways with suppressed recombination. The BSFTR:NBDTP-F_out device obtains a power-conversion efficiency (PCE) of approximately 11.97% by achieving an efficient cathode interfacial layer (CIL)-free device that delivers an even higher PCE of 12.3%, which ranks among the top values for the reported NF-SMSCs. This work provides a simple solution for achieving high-performance NF-SMSCs by identifying the key factors for designing efficient, cost-saving, mass production-favorable CIL-free organic photovoltaic devices.

Journal of Materials Chemistry A

Cathode interfacial layer-free all small-molecule solar cells with efficiency over 12%†

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Cathode interfacial layer-free all small-molecule solar cells with efficiency over 12%

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