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

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 dio...

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Veröffentlicht in:Nature communications 2014-10, Vol.5 (1), p.5162-5162, Article 5162
Hauptverfasser: He, Daowei, Zhang, Yuhan, Wu, Qisheng, Xu, Rui, Nan, Haiyan, Liu, Junfang, Yao, Jianjun, Wang, Zilu, Yuan, Shijun, Li, Yun, Shi, Yi, Wang, Jinlan, Ni, Zhenhua, He, Lin, Miao, Feng, Song, Fengqi, Xu, Hangxun, Watanabe, K., Taniguchi, T., Xu, Jian-Bin, Wang, Xinran
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Sprache:eng
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Zusammenfassung: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 cm 2  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. Inorganic two-dimensional atomic crystals exhibit a variety of unusual but practically useful properties. Here, the authors produce an organic counterpart, atomically smooth monolayers of a molecular crystal, and use this organic analogue of graphene in high-performance organic field-effect transistors.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms6162