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Title: Ultrahigh mobility and efficient charge injection in monolayer organic thin-film transistors on boron nitride
Authors: He, DW
Qiao, JS 
Zhang, LL
Wang, JY
Lan, T
Qian, J
Li, Y
Shi, Y
Chai, Y 
Lan, W
Ono, LK
Qi, YB
Xu, JB
Ji, W
Wang, XR
Issue Date: 2017
Publisher: American Association for the Advancement of Science (AAAS)
Source: Science advances, 2017, v. 3, no. 9, e1701186 How to cite?
Journal: Science advances 
Abstract: Organic thin-film transistors (OTFTs) with high mobility and low contact resistance have been actively pursued as building blocks for low-cost organic electronics. In conventional solution-processed or vacuum-deposited OTFTs, due to interfacial defects and traps, the organic film has to reach a certain thickness for efficient charge transport. Using an ultimate monolayer of 2,7-dioctyl[1] benzothieno[3,2-b][1] benzothiophene (C8-BTBT) molecules as an OTFT channel, we demonstrate remarkable electrical characteristics, including intrinsic hole mobility over 30 cm(2)/Vs, Ohmic contact with 100 Omega circle cm resistance, and band-like transport down to 150 K. Compared to conventional OTFTs, the main advantage of a monolayer channel is the direct, nondisruptive contact between the charge transport layer and metal leads, a feature that is vital for achieving low contact resistance and current saturation voltage. On the other hand, bilayer and thicker C8-BTBT OTFTs exhibit strong Schottky contact and much higher contact resistance but can be improved by inserting a doped graphene buffer layer. Our results suggest that highly crystalline molecular monolayers are promising form factors to build high-performance OTFTs and investigate device physics. They also allow us to precisely model how the molecular packing changes the transport and contact properties.
ISSN: 2375-2548
DOI: 10.1126/sciadv.1701186
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