journal article·2020-04-06

Bandgap Tailored Nonfullerene Acceptors for Low-Energy-Loss Near-Infrared Organic Photovoltaics

Jaewon Lee, Seyeong Song, Jianfei Huang, Zhifang Du, Hansol Lee, Ziyue Zhu, Seo-Jin Ko, Thuc-Quyen Nguyen, Jin Young Kim, Kilwon Cho, Guillermo C. Bazan

ACS Materials Letters· Volume 2· Issue 4
Publisher page

Abstract

A series of A−π–D−π–A-type nonfullerene acceptors (NFAs) was designed and synthesized with the goal of optimizing light absorption and energy losses in near-infrared (NIR) organic solar cells (OSCs) principally through the use of side-chain engineering. Specific molecules include p-IO1, o-IO1, p-IO2, and o-IO2 with optical bandgaps of 1.34, 1.28, 1.24, and 1.20 eV, respectively. Manipulating the optoelectronic properties and intermolecular organization by substituting bulky phenylhexyl (p-) for linear octyl chains (o-) and replacing bisalkoxy (-O2) with alkyl-alkoxy combination (-O1) allows one to target energy bandgaps and achieve a favorable bulk heterojunction morphology when in the presence of the donor polymer PTB7-Th. Solar cells based on o-IO1 and PTB7-Th exhibit an optimal power conversion efficiency of 13.1%. The excellent photovoltaic performance obtained with the o-IO1 acceptor can be attributed to a short-circuit current of 26.3 mA cm–2 and energy losses on the order of 0.54 eV. These results further highlight how side-chain engineering is a straightforward strategy to tune the molecular design of n-type molecular semiconductors, particularly in the context of NIR high-efficiency organic photovoltaics.
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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 Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea

Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States

Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea

Center for Advanced Soft Electronics, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea

Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea

Department of Chemistry and Biochemistry, University of California at Santa BarbaraSanta Barbara, California 93106, United States

Departments of Chemistry and Chemical Engineering, National University of Singapore, Singapore 117543, Singapore

Funding

National Research Foundation of Korea · Office of Naval Research · Ministry of Science, ICT and Future Planning · Mitsubishi Chemical Center for Advanced Materials, University of California Santa Barbara

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