期刊
DYES AND PIGMENTS
卷 200, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2022.110176
关键词
Organic photovoltaic; Thienopyrroledione; Bithienopyrroledione; Fullerene; Non-fullerene
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2020R1A2C2008757, NRF-2020R1I1A1A01053129]
Thienopyrroledione (TPD) derivatives were designed and synthesized as electron-accepting core building blocks for high-performance organic photovoltaic (OPV) cells. The synthesized copolymers showed broad absorption and low frontier molecular orbital energy levels. The OPV devices exhibited high power conversion efficiency (PCE), with the best performance achieved by PBDT-biTPD(HD):IT-4F.
Thienopyrroledione (TPD) is a promising electron-accepting core building block of donor-acceptor-type semiconducting polymers for use in high-performance organic photovoltaic (OPV) cells. In this study, bithienopyrroledione (biTPD) derivatives with different lengths of side alkyl chains were designed to utilize specific ability including stronger electron-withdrawing strength and extended pi-conjugation compared with the mono TPD unit. The synthesized copolymers, poly(3-(5-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b'] dithiophen-2-yl)-6-octylthieno[3,2-b]thiophen-2-yl)-5,5'-bis(2-butyloctyl)-3'-(6-octylthieno[3,2-b]thiophen-2-yl)-4H,4'H-[1,1'-bithieno[3,4-c]pyrrole]-4,4',6,6'(5H,5'H)-tetraone) (PBDT-biTPD(BO)) and poly(3-(5-(4,8-bis (5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophen-2-yl)-6-octylthieno[3,2-b]thiophen-2-yl)-5,5'-bis (2-hexyldecyl)-3'-(6-octylthieno[3,2-b]thiophen-2-yl)-4H,4'H-[1,1'-bithieno[3,4-c]pyrrole]-4,4',6,6'(5H,5'H)-tetraone) (PBDT-biTPD(HD)), composed of biTPD and typical benzo[1,2-b:4,5-b']dithiophene (BDT) units had broad absorption with deep frontier molecular orbital energy levels. In addition, PBDT-biTPD(BO) and PBDTbiTPD(HD) showed predominant face-on orientation confirmed by the grazing-incidence wide-angle X-ray scattering (GIWAXS). The OPV device exhibited the maximum power conversion efficiency (PCE) of 8.48% and 8.99% for PBDT-biTPD(BO):PC71BM and PBDT-biTPD(HD):PC71BM, respectively, with a high open-circuit voltage (VOC). In particular, PBDT-biTPD(HD):IT-4F showed the best PCE of 9.49% with improved shortcircuit current, despite the slightly decreased VOC compared to that of PBDT-biTPD(HD):PC71BM.
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