Bandgap Tailored Nonfullerene Acceptors for Low-Energy-Loss Near-Infrared Organic Photovoltaics
SCIE
SCOPUS
- Title
- Bandgap Tailored Nonfullerene Acceptors for Low-Energy-Loss Near-Infrared Organic Photovoltaics
- Authors
- 이재원; Song, Seyeong; Huang, Jianfei; Du, Zhifang; 이한솔; Zhu, Ziyue; Ko, Seo-Jin; Nguyen Thuc-Quyen; Kim, Jin Young; CHO, KIL WON; Bazan, Guillermo C.
- Date Issued
- 2020-04-06
- Publisher
- AMER CHEMICAL SOC
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/102646
- DOI
- 10.1021/acsmaterialslett.9b00512
- ISSN
- 2639-4979
- Article Type
- Article
- Citation
- Acs Materials Letters, vol. 2, no. 4, page. 395 - 402, 2020-04-06
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