TY - JOUR
T1 - Difluorobenzoxadiazole-Based Polymer Semiconductors for High-Performance Organic Thin-Film Transistors with Tunable Charge Carrier Polarity
AU - Shi, Shengbin
AU - Wang, Yuxi
AU - Uddin, Mohammad Afsar
AU - Zhou, Xin
AU - Guo, Han
AU - Liao, Qiaogan
AU - Zhu, Xucheng
AU - Cheng, Xing
AU - Woo, Han Young
AU - Guo, Xugang
N1 - Funding Information:
S.S. and Y.W. contributed equally to this work. X.G. is thankful for the financial support by Shenzhen Peacock Plan project (KQTD20140630110339343), the Basic Research Fund of Shenzhen City (JCYJ20160530185244662 and JCYJ20140714151402769), the National Science Foundation of China (NSFC, No. 51573076), the Shenzhen Key Lab funding (ZDSYS201505291525382), the Guangdong Natural Science Foundation (2015A030313900), and South University of Science and Technology of China (FRG-SUSTC1501A-72). H.G. is grateful to the Basic Research Fund of Shenzhen City (JCYJ20160530190226226). X.Z. (Zhou) thanks the Undergraduate Innovation Training Program (2015X03). H.Y.W. is grateful to the financial support from the NRF of Korea (2015R1D1A1A09056905).
Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2017/12
Y1 - 2017/12
N2 - A series of difluorobenzoxadiazole-based copolymers are synthesized for applications in high-performance organic thin-film transistors. Four π-spacers with distinct electrical properties, bithiophene, difluorobithiophene, 2-thiophene-2′-thiazole, and bithiazole, are inserted between head-to-head linkage containing bithiophene to promote polymer chain packing. Among the series, polymer containing bithiophene exhibits a unipolar p-channel performance with a substantial hole mobility of 2.92 cm2 V−1 s−1, and minor structural modification leads to polymer containing bithiazole showing a remarkable unipolar n-channel performance with an electron mobility of 0.83 cm2 V−1 s−1. Through a simple structural modification, such a drastic charge carrier polarity change without sacrificing mobility is elusive in organic thin-film transistor field. Polymer containing hybrid 2-thiophene-2′-thiazole spacer exhibits ambipolarity with encouraging hole/electron mobility of 0.27/0.35 cm2 V−1 s−1, and polymer containing difluorobithiophene shows an average hole mobility of 0.53 cm2 V−1 s−1. Among the results, p-channel transistors exhibit encouraging device stability. The results demonstrate that difluorobenzoxadiazole is a versatile building block for enabling high-mobility semiconductors with variable charge carrier polarity. X-ray diffraction reveals that all difluorobenzoxadiazole-based polymers have substantial film crystallinity with close π-stacking and varied polymer chain orientation. The structure–property–device performance correlations from this study offer useful insights for materials innovation in organic thin-film transistors.
AB - A series of difluorobenzoxadiazole-based copolymers are synthesized for applications in high-performance organic thin-film transistors. Four π-spacers with distinct electrical properties, bithiophene, difluorobithiophene, 2-thiophene-2′-thiazole, and bithiazole, are inserted between head-to-head linkage containing bithiophene to promote polymer chain packing. Among the series, polymer containing bithiophene exhibits a unipolar p-channel performance with a substantial hole mobility of 2.92 cm2 V−1 s−1, and minor structural modification leads to polymer containing bithiazole showing a remarkable unipolar n-channel performance with an electron mobility of 0.83 cm2 V−1 s−1. Through a simple structural modification, such a drastic charge carrier polarity change without sacrificing mobility is elusive in organic thin-film transistor field. Polymer containing hybrid 2-thiophene-2′-thiazole spacer exhibits ambipolarity with encouraging hole/electron mobility of 0.27/0.35 cm2 V−1 s−1, and polymer containing difluorobithiophene shows an average hole mobility of 0.53 cm2 V−1 s−1. Among the results, p-channel transistors exhibit encouraging device stability. The results demonstrate that difluorobenzoxadiazole is a versatile building block for enabling high-mobility semiconductors with variable charge carrier polarity. X-ray diffraction reveals that all difluorobenzoxadiazole-based polymers have substantial film crystallinity with close π-stacking and varied polymer chain orientation. The structure–property–device performance correlations from this study offer useful insights for materials innovation in organic thin-film transistors.
KW - ambipolarity
KW - difluorobenzoxadiazole-based polymer semiconductor
KW - electron mobility
KW - hole mobility
KW - organic thin-film transistor
UR - http://www.scopus.com/inward/record.url?scp=85033686391&partnerID=8YFLogxK
U2 - 10.1002/aelm.201700100
DO - 10.1002/aelm.201700100
M3 - Article
AN - SCOPUS:85033686391
VL - 3
JO - Advanced Electronic Materials
JF - Advanced Electronic Materials
SN - 2199-160X
IS - 12
M1 - 1700100
ER -