期刊
CRYSTAL GROWTH & DESIGN
卷 16, 期 5, 页码 2624-2630出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.5b01726
关键词
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资金
- National Natural Science Foundation of China [21432005, 11374070, 61327009]
- Chinese Academy of Sciences [XDA 09040201]
High order of molecular packing and perfect semiconductor/dielectric interface are two key factors to achieve high performance for organic field-effect transistors (OFET). Moreover, the thin crystal offers an improved efficiency of carrier injection for OFETs. To this aim, formation of thin and large single crystal directly on dielectrics is the basis to obtain the ideal crystal OFETs. Herein, we report the controlled growth of ultrathin 2D Pentacene (Pn) crystal via nanoseed assisted physical vapor transport (PVT) method grown directly on SiO2. The size, thickness, and density of Pn crystals are systematically studied. Potentially effective parameters such as initially lowered Pn coverage and decreased supersaturation with the aid of carrier gas flow were optimized to grow large, ultrathin 2D Pn crystalline flakes efficient for the fabrication of crystal OFETs. The typical size and thickness of as-grown Pn crystalline flakes can be controlled to be large and thin enough. Device of ultrathin crystal with bottom gate and top contact configuration showed mobility as high as 5.6 cm(2) V-1 s(-1), indicating that the proposed novel architecture of organic molecular crystals may pave the way toward the application of large-sized single crystals of Pn in organic electronics.
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