Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties
[1];
[9]
- Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China, South China Institute of Collaborative Innovation Dongguan 523808 P. R. China, State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
- School of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Shanghai 200240 P. R. China
- Center for Advanced Low‐Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 P. R. China
- Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
- School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg MS 39406 USA
- State Key Laboratory of Fluorinated Materials Zibo City Shandong Province 256401 P. R. China
- Department of Chemistry Zhejiang University Hangzhou 310027 P. R. China
- South China Institute of Collaborative Innovation Dongguan 523808 P. R. China, State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
- Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China, School of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Shanghai 200240 P. R. China
Abstract Single‐layered organic solar cells (OSCs) using nonfullerene acceptors have reached 16% efficiency. Such a breakthrough has inspired new sparks for the development of the next generation of OSC materials. In addition to the optimization of electronic structure, it is important to investigate the essential solid‐state structure that guides the high efficiency of bulk heterojunction blends, which provides insight in understanding how to pair an efficient donor–acceptor mixture and refine film morphology. In this study, a thorough analysis is executed to reveal morphology details, and the results demonstrate that Y6 can form a unique 2D packing with a polymer‐like conjugated backbone oriented normal to the substrate, controlled by the processing solvent and thermal annealing conditions. Such morphology provides improved carrier transport and ultrafast hole and electron transfer, leading to improved device performance, and the best optimized device shows a power conversion efficiency of 16.88% (16.4% certified). This work reveals the importance of film morphology and the mechanism by which it affects device performance. A full set of analytical methods and processing conditions are executed to achieve high efficiency solar cells from materials design to device optimization, which will be useful in future OSC technology development.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1618144
- Journal Information:
- Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 10 Journal Issue: 18; ISSN 1614-6832
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
Web of Science
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