Two-dimensional quasi-freestanding molecular crystals for high-performance organic field-effect transistors

Daowei He, Yuhan Zhang, Qisheng Wu, Rui Xu, Haiyan Nan, Junfang Liu, Jianjun Yao, Zilu Wang, Shijun Yuan, Yun Li, Yi Shi (), Jinlan Wang (), Zhenhua Ni, Lin He, Feng Miao, Fengqi Song, Hangxun Xu, K. Watanabe, T. Taniguchi, Jian-Bin Xu and Xinran Wang ()
Additional contact information
Daowei He: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Yuhan Zhang: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Qisheng Wu: Southeast University
Rui Xu: Beijing Normal University
Haiyan Nan: Southeast University
Junfang Liu: Beijing Normal University
Jianjun Yao: Asylum Research, Oxford Instruments
Zilu Wang: Southeast University
Shijun Yuan: Southeast University
Yun Li: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Yi Shi: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Jinlan Wang: Southeast University
Zhenhua Ni: Southeast University
Lin He: Beijing Normal University
Feng Miao: School of Physics, Nanjing University
Fengqi Song: School of Physics, Nanjing University
Hangxun Xu: CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China
K. Watanabe: National Institute for Materials Science, 1-1 Namiki
T. Taniguchi: National Institute for Materials Science, 1-1 Namiki
Jian-Bin Xu: The Chinese University of Hong Kong
Xinran Wang: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Two-dimensional atomic crystals are extensively studied in recent years due to their exciting physics and device applications. However, a molecular counterpart, with scalable processability and competitive device performance, is still challenging. Here, we demonstrate that high-quality few-layer dioctylbenzothienobenzothiophene molecular crystals can be grown on graphene or boron nitride substrate via van der Waals epitaxy, with precisely controlled thickness down to monolayer, large-area single crystal, low process temperature and patterning capability. The crystalline layers are atomically smooth and effectively decoupled from the substrate due to weak van der Waals interactions, affording a pristine interface for high-performance organic transistors. As a result, monolayer dioctylbenzothienobenzothiophene molecular crystal field-effect transistors on boron nitride show record-high carrier mobility up to 10 cm2 V−1 s−1 and aggressively scaled saturation voltage ~1 V. Our work unveils an exciting new class of two-dimensional molecular materials for electronic and optoelectronic applications.

Date: 2014
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DOI: 10.1038/ncomms6162

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