Статья

Tailoring Regioisomeric Structures of π-Conjugated Polymers Containing Monofluorinated π-Bridges for Highly Efficient Polymer Solar Cells

Baobing FanInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaMeijing LiInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaDifei ZhangInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaWenkai ZhongInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaLei YingInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaZhaomiyi ZengInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaKang AnInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaZhenqiang HuangInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaLinrui ShiInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaGuillermo C. BazanDepartments of Chemistry and Chemical Engineering, National University of Singapore, SingaporeFei HuangInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, ChinaYong CaoInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China

2020en

ABI

Аннотация

Fluorine substitution has been vital to the molecular design of π-conjugated polymers toward highly efficient polymer solar cells because it results in improved intermolecular contacts. However, the understanding of how regioselectivity impacts relevant optoelectronic properties in nonsymmetric fluorinated systems remains poorly developed. In response, we herein incorporated a single fluorine atom onto the π-bridge of [1,2,3]triazolo[4,5-f]isoindole-5,7(2H,6H)-dione (TzBI)-polymers to construct two regioisomeric donors, denoted as PTzBI-dF and PTzBI-pF, and investigated how these subtle structural details impact the bulk properties of solar cells. We found that the fluorine substituent position has a profound effect on molecular conformations and thus the aggregated morphology, leading to notably different optical absorption and charge transport. The resulting polymer PTzBI-dF, with fluorine atom distal to the TzBI core, exhibited a power conversion efficiency of up to 17.3% that obviously outperforms the regioisomeric counterpart. These findings highlighted the strategic superiority of materials design toward high-performance solar cells.

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Идентификаторы

DOI: 10.1021/acsenergylett.0c00939

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar