title: Surface Polarity and Self-Structured Nanogrooves Collaboratively Oriented Molecular Packing for High Crystallinity toward Efficient Charge Transport.
abstract: Efficient charge transport in organic semiconductors is essential for construction of high performance optoelectronic devices. Herein, for the first time, we demonstrate that poly(amic acid) (PAA), a facilely deposited and annealing-free dielectric layer, can tailor the growth of organic semiconductor films with large area and high crystallinity toward efficient charge transport and high mobility in their thin film transistors. Pentacene is used as a model system to demonstrate the concept with mobility up to 30.6 cm2V-1s-1, comparable to its high quality single crystal devices. The structure of PAA has corrugations with OH groups pointing out of the surface, and the presence of an amide bond further allows adjacent polymer strands to interact via hydrogen bonding, leading to a self-rippled surface perpendicular to the corrugation. On the other hand, the strong polar groups (-COOH/-CONH) of PAA could provide repulsive forces between PAA and pentacene, which results in the vertical orientation of pentacene on the dielectric surface. Indeed, in comparison with its imidized counterpart polyimide (PI), PAA dielectric significantly enhances the film crystallinity, drastically increases the domain size, and decreases the interface trap density, giving rise to superior device performance with high mobility. This concept can be extended to more organic semiconducting systems, e.g., 2,6-diphenylanthracene (DPA), tetracene, copper phthalocyanine (CuPc), and copper hexadecafluorophthalocyanine (F16CuPc), demonstrating the general applicability. The results show the importance of combining surface nanogrooves with the strong polarity in orienting the molecular arrangement for high crystallinity toward efficient charge transport in organic semiconductors.
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.|Center for Nanotechnology, Heisenbergstraße 11, 48149 Münster, Germany & Physikalisches Institut, Westfälische Wilhelms-Universität , Wilhelm-Klemm-Straße 10, 48149 Münster, Germany.
authors.forename: Deyang
authors.initials: D
authors.lastname: Ji
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.|Department of Chemistry, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong, China.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Xu
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Longfeng
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Center for Nanotechnology, Heisenbergstraße 11, 48149 Münster, Germany & Physikalisches Institut, Westfälische Wilhelms-Universität , Wilhelm-Klemm-Straße 10, 48149 Münster, Germany.|Center for Multiscale Theory and Computation, Westfälische Wilhelms-Universität Münster , Wilhelm-Klemm-Straße 10, 48149 Münster, Germany.
authors.forename: Saeed
authors.identifier: 0000-0003-0777-5004
authors.initials: S
authors.lastname: Amirjalayer
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Lang
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Zhen
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Zou
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Yifan
authors.initials: Y
authors.lastname: Yao
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Huanli
authors.initials: H
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC) , Chengdu 610054, China.
authors.forename: Junsheng
authors.identifier: 0000-0002-7484-8114
authors.initials: J
authors.lastname: Yu
authors.affiliation: Center for Nanotechnology, Heisenbergstraße 11, 48149 Münster, Germany & Physikalisches Institut, Westfälische Wilhelms-Universität , Wilhelm-Klemm-Straße 10, 48149 Münster, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Fuchs
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.|Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Tianjin 300072, China.
authors.forename: Wenping
authors.identifier: 0000-0001-5686-2740
authors.initials: W
authors.lastname: Hu