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Proceedings Paper

AFM and 2-D GIXD studies on pentacene thin films for transistor application
Author(s): Hoichang Yang; Tae Joo Shin; Mang-Mang Ling; Chang Y. Ryu; Zhenan Bao
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Paper Abstract

We studied how the underlying grain boundary morphology in the first pentacene monolayer affects the "macroscopic" mobility of the 40 nm thick OTFT film. Through manipulating surface properties of a SiO2 dielectric layer using self assembled monolayers (SAMs), we controlled the crystalline domain morphology of pentacene films that have thicknesses ranging from sub-monolayer to 40 nm. Atomic force microscopy (AFM) and two-dimensional grazing incidence X-ray diffraction are employed to characterize the morphology and crystalline structure of pentane films. In addition, the spatial variation of charge carriers in the first few layers was investigated using conducting AFM (C-AFM). In particular, faceted or dendritic island morphology has been observed in the first pentacene layer mainly depending on surface morphology of hydrophobic SAMs, and C-AFM supported that the faceted islands showed larger current flow than the dendritic islands. This C-AFM current tendency correlates with the "macroscopic" charge mobility in OTFT. Because the faceted morphology should represent the single crystal-like pentacene island, faceted islands have fewer internal crystal defects and the higher current flow than the dendritic islands.

Paper Details

Date Published: 20 September 2005
PDF: 8 pages
Proc. SPIE 5940, Organic Field-Effect Transistors IV, 59400B (20 September 2005); doi: 10.1117/12.614990
Show Author Affiliations
Hoichang Yang, Rensselaer Polytechnic Institute (United States)
Tae Joo Shin, Brookhaven National Lab. (United States)
Mang-Mang Ling, Stanford Univ. (United States)
Chang Y. Ryu, Rensselaer Polytechnic Institute (United States)
Zhenan Bao, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 5940:
Organic Field-Effect Transistors IV
Zhenan Bao; David J. Gundlach, Editor(s)

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