journal article·2021-10-08Open access

Formation of Vitrified Solid Solution Enables Simultaneously Efficient and Stable Organic Solar Cells

Baobing Fan, Wei Gao, Ying Wang, Wenkai Zhong, Francis Lin, Wen Jung Li, Fei Huang, Kin-Man Yu, Alex K.-Y. Jen

ACS Energy Letters· Volume 6· Issue 10

Abstract

Employing a ternary blend as absorber is an ingenious tactic to achieve broad spectral coverage in single-junction organic photovoltaics. The incorporation of a second acceptor with relatively lower electron affinity (EA) is important for attaining increased open-circuit voltage (VOC) of ternary devices. However, the common way in achieving a lower EA through tailoring the skeletons may affect the miscibility between acceptors, which inherently restrict the dependence of VOC on compositions. Herein, we developed a low-EA acceptor through side-chain engineering to ensure similarity with another ultranarrow-bandgap acceptor, enabling a good miscibility between the two species and formation of a vitrified solid solution over a large range of compositions. As a result, continuously increased VOC is realized, while the other parameters are less composition-sensitive. Besides, the vitrification facilitates intimate intermolecular interactions in ternary blends, suppressing thermally induced crystallization. Ultimately, increased photovoltaic efficiency and thermal stability are simultaneously achieved for the resulting ternary devices.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Perovskite Materials and Applications · Conducting polymers and applications

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

Affiliations

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong 999077, China

Department of Physics, City University of Hong Kong, Kowloon, Hong Kong 999077, China

Frontiers Science Center for Transformative Molecules, In-situ Center for Physical Science, and Center of Hydrogen Science, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Department of Mechanical Engineering, City University of Hong Kong, Kowloon, Hong Kong 999077, China

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

Hong Kong Institute for Clean Energy, City University of Hong Kong, Kowloon, Hong Kong 999077, China

Department of Materials Science & Engineering, University of Washington, Seattle, Washington 98195, United States

Funding

Research Grants Council, University Grants Committee · Innovation and Technology Fund · Science, Technology and Innovation Commission of Shenzhen Municipality · Office of Naval Research · City University of Hong Kong · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials · Guangdong Major Project of Basic and Applied Basic Research

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