TY - JOUR
T1 - Fused Bithiophene Imide Oligomer and Diketopyrrolopyrrole Copolymers for n-Type Thin-Film Transistors
AU - Zhang, Yujie
AU - Tang, Linjing
AU - Sun, Huiliang
AU - Ling, Shaohua
AU - Yang, Kun
AU - Uddin, Mohammad Afsar
AU - Guo, Han
AU - Tang, Yumin
AU - Wang, Yang
AU - Feng, Kui
AU - Shi, Yongqiang
AU - Liu, Juqing
AU - Zhang, Shiming
AU - Woo, Han Young
AU - Guo, Xugang
N1 - Funding Information:
Y.Z., L.T., and H.S. contributed equally to this work. S.Z. acknowledges the financial support from the National Key R&D Program of ?Strategic Advanced Electronic Materials? (2016YFB0401100) and the National Natural Science Foundation of China (61574077), as well as the Major Program of Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China (No.19KJA460005). X.G. is grateful to the National Natural Science Foundation of China (51573076) and Shenzhen Basic Research Fund (JYJ20170817105905899). H.S. acknowledges the National Natural Science Foundation of China (21801124). The authors thank Dr. Yinhua Yang at Materials Characterization and Preparation Center, Southern University of Science and Technology (SUSTech) for the NMR characterization. The work was also supported by Center for Computational Science and Engineering of SUSTech.
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Diketopyrrolopyrrole (DPP)-based copolymers have received considerable attention as promising semiconducting materials for high-performance organic thin-film transistors (OTFTs). However, these polymers typically exhibit p-type or ambipolar charge-transporting characteristics in OTFTs due to their high-lying highest occupied molecular orbital (HOMO) energy levels. In this work, a new series of DPP-based n-type polymers have been developed by incorporating fused bithiophene imide oligomers (BTIn) into DPP polymers. The resulting copolymers BTIn-DPP show narrow band gaps as low as 1.27 eV and gradually down-shifted frontier molecular orbital energy levels upon the increment of imide group number. Benefiting from the coplanar backbone conformation, well-delocalized π-system, and favorable polymer chain packing, the optimal polymer in the series shows promising n-type charge transport with an electron mobility up to 0.48 cm2 V−1 s−1 in OTFTs, which is among the highest values for the DPP-based n-type polymers reported to date. The results demonstrate that incorporating fused bithiophene imide oligomers into polymers can serve as a promising strategy for constructing high-performance n-type polymeric semiconductors.
AB - Diketopyrrolopyrrole (DPP)-based copolymers have received considerable attention as promising semiconducting materials for high-performance organic thin-film transistors (OTFTs). However, these polymers typically exhibit p-type or ambipolar charge-transporting characteristics in OTFTs due to their high-lying highest occupied molecular orbital (HOMO) energy levels. In this work, a new series of DPP-based n-type polymers have been developed by incorporating fused bithiophene imide oligomers (BTIn) into DPP polymers. The resulting copolymers BTIn-DPP show narrow band gaps as low as 1.27 eV and gradually down-shifted frontier molecular orbital energy levels upon the increment of imide group number. Benefiting from the coplanar backbone conformation, well-delocalized π-system, and favorable polymer chain packing, the optimal polymer in the series shows promising n-type charge transport with an electron mobility up to 0.48 cm2 V−1 s−1 in OTFTs, which is among the highest values for the DPP-based n-type polymers reported to date. The results demonstrate that incorporating fused bithiophene imide oligomers into polymers can serve as a promising strategy for constructing high-performance n-type polymeric semiconductors.
KW - bithiophene imide
KW - diketopyrrolopyrrole
KW - n-type polymer semiconductors
KW - organic thin-film transistors
UR - http://www.scopus.com/inward/record.url?scp=85074844346&partnerID=8YFLogxK
U2 - 10.1002/marc.201900394
DO - 10.1002/marc.201900394
M3 - Article
C2 - 31702099
AN - SCOPUS:85074844346
VL - 40
JO - Macromolecular Rapid Communications
JF - Macromolecular Rapid Communications
SN - 1022-1336
IS - 23
M1 - 1900394
ER -