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Effects of Bithiophene Imide Fusion on the Device Performance of Organic Thin-Film Transistors and All-Polymer Solar Cells

Authors
Wang, YingfengYan, ZhenglongGuo, HanUddin, Mohammad AfsarLing, ShaohuaZhou, XinSu, HuiminDai, JunfengWoo, Han YoungGuo, Xugang
Issue Date
27-11월-2017
Publisher
WILEY-V C H VERLAG GMBH
Keywords
ladder polymers; organic electronics; organic thin-film transistors; solar cells; structure-property relationships
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.56, no.48, pp.15304 - 15308
Indexed
SCIE
SCOPUS
Journal Title
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume
56
Number
48
Start Page
15304
End Page
15308
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/81507
DOI
10.1002/anie.201708421
ISSN
1433-7851
Abstract
Two new bithiophene imide (BTI)-based n-type polymers were synthesized. f-BTI2-FT based on a fused BTI dimer showed a smaller band gap, a lower LUMO, and higher crystallinity than s-BTI2-FT containing a BTI dimer connected through a single bond. s-BTI2-FT exhibited a remarkable electron mobility of 0.82cm(2)V(-1)s(-1), and f-BTI2-FT showed a further improved mobility of 1.13cm(2)V(-1)s(-1) in transistors. When blended with the polymer donor PTB7-Th, f-BTI2-FT-based all-polymer solar cells (all-PSCs) attained a PCE of 6.85%, the highest value for an all-PSC not based on naphthalene (or perylene) diimide polymer acceptors. However, s-BTI2-FT all-PSCs showed nearly no photovoltaic effect. The results demonstrate that f-BTI2-FT is one of most promising n-type polymers and that ring fusion offers an effective approach for designing polymers with improved electrical properties.
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