title: Crystalline ultrasmooth self-assembled monolayers of alkylsilanes for organic field-effect transistors.
abstract: Crystalline self-assembled monolayers (SAMs) of organosilane compounds such as octadecyltrimethoxysilane (OTMS) and octadecyltrichlorosilane (OTCS) were deposited by a simple, spin-casting technique onto Si/SiO(2) substrates. Fabrication of the OTMS SAMs and characterization using ellipsometry, contact angle, atomic force microscopy (AFM), grazing angle attenuated total reflectance Fourier transform infrared (GATR-FTIR) spectroscopy and grazing incidence X-ray diffraction (GIXD) are described. The characterization confirms that these monolayers exhibit a well-packed crystalline phase and a remarkably high degree of smoothness. Semiconductors deposited by vapor deposition onto the crystalline OTS SAM grow in a favorable two-dimensional layered growth manner which is generally preferred morphologically for high charge carrier transport. On the OTMS SAM treated dielectric, pentacene OFETs showed hole mobilities as high as 3.0 cm(2)/V x s, while electron mobilities as high as 5.3 cm(2)/V x s were demonstrated for C(60).
authors.affiliation: Department of Chemical Engineering, Stanford University, 381 North South Mall, Stanford, California 94305, USA. yutaka_1.ito@toppan.co.jp
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Ito
authors.forename: Ajay A
authors.initials: AA
authors.lastname: Virkar
authors.forename: Stefan
authors.initials: S
authors.lastname: Mannsfeld
authors.forename: Joon Hak
authors.initials: JH
authors.lastname: Oh
authors.forename: Michael
authors.initials: M
authors.lastname: Toney
authors.forename: Jason
authors.initials: J
authors.lastname: Locklin
authors.forename: Zhenan
authors.initials: Z
authors.lastname: Bao