title: Enhancing 2D growth of organic semiconductor thin films with macroporous structures via a small-molecule heterointerface.
abstract: The physical structure of an organic solid is strongly affected by the surface of the underlying substrate. Controlling this interface is an important issue to improve device performance in the organic electronics community. Here we report an approach that utilizes an organic heterointerface to improve the crystallinity and control the morphology of an organic thin film. Pentacene is used as an active layer above, and m-bis(triphenylsilyl)benzene is used as the bottom layer. Sequential evaporations of these materials result in extraordinary morphology with far fewer grain boundaries and myriad nanometre-sized pores. These peculiar structures are formed by difference in molecular interactions between the organic layers and the substrate surface. The pentacene film exhibits high mobility up to 6.3 cm(2) V(-1) s(-1), and the pore-rich structure improves the sensitivity of organic-transistor-based chemical sensors. Our approach opens a new way for the fabrication of nanostructured semiconducting layers towards high-performance organic electronics.
authors.affiliation: 1] Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea [2].
authors.forename: Boseok
authors.initials: B
authors.lastname: Kang
authors.affiliation: 1] Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea [2] School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea [3].
authors.forename: Moonjeong
authors.initials: M
authors.lastname: Jang
authors.affiliation: 1] Polymer Research Institute, Pohang University of Science and Technology, Pohang 790-784, Korea [2].
authors.forename: Yoonyoung
authors.initials: Y
authors.lastname: Chung
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Haena
authors.initials: H
authors.lastname: Kim
authors.affiliation: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea.
authors.forename: Sang Kyu
authors.initials: SK
authors.lastname: Kwak
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Joon Hak
authors.initials: JH
authors.lastname: Oh
authors.affiliation: 1] Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea [2] Polymer Research Institute, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Kilwon
authors.initials: K
authors.lastname: Cho