NDLI: Thienothiophene-based copolymers for high-performance solar cells, employing different orientations of the thiazole group as a π bridge

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhu, Qianqian Wen, Shuguang Gu, Chuantao Yang, Renqiang Wang, Junyi Bao, Xichang Qiu, Meng Zhu, Dangqiang Shahid, Bilal
Copyright Year	2017
Abstract	In this work, a thiazole moiety was employed as a π bridge incorporated into the backbone of quinoid polymers. The new strategy combined the characteristics of a thiazole unit with a deep HOMO energy level and a thieno[3,4-b]thiophene moiety (TT) with broad absorption. Two isomeric D–A copolymers, PTBTz-2 and PTBTz-5, were synthesized, with different orientations of the thiazole to the TT moiety. Interestingly, in comparison with PTBTz-5, PTBTz-2 exhibited an even lower HOMO energy level, a higher dipole moment, and a more planar molecular configuration, together with preferable phase domains and good intermixing with PC71BM. Thus, a superior PCE of 9.72% for the photovoltaic device was obtained, with a remarkable JSC of 16.84 mA cm−2, which is among the highest values for a single-junction solar cell. This is an increase of ∼40% in PCE in comparison with PTBTz-5 (PCE = 6.91%) and twice as much as for PBT-0F with thiophene as the π-bridge (PCE = 4.5%). This work not only provides a promising high-performance thiazole-containing system, but also reveals that the orientation of the asymmetric unit along the polymer backbone plays a crucial role and should be taken into account in future molecule design.
Starting Page	614
Ending Page	620
Page Count	7
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	10
Issue Number	2
Journal	Energy & Environmental Science
DOI	10.1039/c6ee03186b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	TT JSC Thiazole Quinone Thiophene Dipole Solar cell Polymer
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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