Over 17% Efficiency Binary Organic Solar Cells with Photoresponses Reaching 1000 nm Enabled by Selenophene-Fused Nonfullerene Acceptors

Feng Qi; Kui Jiang; Francis Lin; Ziang Wu; Hongna Zhang; Wei Gao; Yuxiang Li; Zongwei Cai; Han Young Woo; Zonglong Zhu; Alex K.-Y. Jen

doi:10.1021/acsenergylett.0c02230

journal article·2021-01-08

Over 17% Efficiency Binary Organic Solar Cells with Photoresponses Reaching 1000 nm Enabled by Selenophene-Fused Nonfullerene Acceptors

Feng Qi, Kui Jiang, Francis Lin, Ziang Wu, Hongna Zhang, Wei Gao, Yuxiang Li, Zongwei Cai, Han Young Woo, Zonglong Zhu, Alex K.-Y. Jen

ACS Energy Letters· Volume 6· Issue 1

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Source abstract

Abstract

Nonfullerene acceptors (NFAs) have played an important role in the development of organic solar cells. However, the optical absorption of most NFAs is limited within 600–900 nm, prohibiting further improvement of short-circuit current density (Jsc). To alleviate this problem, a fused-ring π-core BzS was designed by combining weakly electron-withdrawing benzotriazole (Bz) and strongly electron-donating selenophene together. Besides, the length of N-alkyl chain on the Bz moiety was engineered to tune the morphology, affording two NFAs mBzS-4F and EHBzS-4F. Both NFAs possess an absorption edge approaching 1000 nm, as resulted from the enhanced intramolecular charge transfer in conjunction with efficient intra- and intermolecular interactions. Binary photovoltaic devices based on PM6:mBzS-4F showed a power conversion efficiency of 17.02% with a very high Jsc of 27.72 mA/cm2 and a low energy loss of 0.446 eV. This work provides a strategy for future design of efficient NIR-responsive materials.

Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

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

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

Affiliations

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

Department of Materials Science and Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong

Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195-2120, United States

Department of Chemistry, Korea University, Seoul 136-713, South Korea

State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Kowloon 999077, Hong Kong

Funding

National Research Foundation of Korea · Air Force Office of Scientific Research · Innovation and Technology Fund · Office of Naval Research · Natural Science Foundation of Guangdong Province · APRC Grant of the City University of Hong Kong · Research Grants Council of Hong Kong · 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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