DataVXAdvanced Energy MaterialsPaper
journal article·2019-02

Liquid‐Crystalline Small Molecules for Nonfullerene Solar Cells with High Fill Factors and Power Conversion Efficiencies

Huan Li, Qiong Wu, Ruimin Zhou, Yanan Shi, Chen Yang, Yajie Zhang, Jianqi Zhang, Wenjun Zou, Dan Deng, Kun Lu, Zhixiang Wei

Advanced Energy Materials· Volume 9· Issue 6
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Source abstract

Abstract

Abstract Compared with nonfullerene‐based polymer solar cells, all‐small‐molecule solar cells normally show low power conversion efficiencies (PCEs) due to their low fill factors (FFs). Molecular stacking orientation and phase separation are the main factors affecting the performance of all‐small‐molecule solar cells. In this work, two liquid‐crystalline small‐molecule donors are designed and synthesized and a novel nonfullerene acceptor with good crystallinity developed. Owing to the face‐on orientation of the component molecules and appropriate phase separation in the active layer, a high FF of over 70% and a PCE of 10.7% are obtained from the resulting solar cells; these values are among the best obtained thus far for all‐small‐molecule solar cells. The high FF reported here is significant for a further design of high‐performance all‐small‐molecule solar cells.
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Research context

Polymers

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Molecular Junctions and Nanostructures

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

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

University of Chinese Academy of Sciences Beijing 100049 China

Sino‐Danish College University of Chinese Academy of Sciences Beijing 100190 China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Beijing Municipal Science and Technology Commission · Youth Innovation Promotion Association of the Chinese Academy of Sciences · Chinese Academy of Sciences

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