title: Graphene-Assisted Solution Growth of Vertically Oriented Organic Semiconducting Single Crystals.
abstract: Vertically oriented structures of single crystalline conductors and semiconductors are of great technological importance due to their directional charge carrier transport, high device density, and interesting optical properties. However, creating such architectures for organic electronic materials remains challenging. Here, we report a facile, controllable route for producing oriented vertical arrays of single crystalline conjugated molecules using graphene as the guiding substrate. The arrays exhibit uniform morphological and crystallographic orientations. Using an oligoaniline as an example, we demonstrate this method to be highly versatile in controlling the nucleation densities, crystal sizes, and orientations. Charge carriers are shown to travel most efficiently along the vertical interfacial stacking direction with a conductivity of 12.3 S/cm in individual crystals, the highest reported to date for an aniline oligomer. These crystal arrays can be readily patterned and their current harnessed collectively over large areas, illustrating the promise for both micro- and macroscopic device applications.
authors: Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095-1569, United States.
authors: Yue
authors: Y
authors: Wang
authors: Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095-1569, United States.
authors: Jaime A
authors: JA
authors: Torres
authors: Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095-1569, United States.|WPI Center for Materials Nanoarchitectonics, National Institute for Materials Science , Tsukuba, Ibaraki 305-0040, Japan.
authors: Adam Z
authors: AZ
authors: Stieg
authors: Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095-1569, United States.
authors: Shan
authors: S
authors: Jiang
authors: Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095-1569, United States.
authors: Michael T
authors: MT
authors: Yeung
authors: Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095-1569, United States.
authors: Yves
authors: Y
authors: Rubin
authors: Applied Research Institute and Computational Science and Engineering, College of Engineering, University of Illinois at Urbana-Champaign , Champaign, Illinois 61820, United States.
authors: Santanu
authors: S
authors: Chaudhuri
authors: Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095-1569, United States.
authors: Xiangfeng
authors: X
authors: Duan
authors: Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095-1569, United States.
authors: Richard B
authors: RB
authors: Kaner
keywords: graphene; oligoaniline; organic single crystal; selective growth patterning; vertical alignment