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Temperature Dependence of Bis(triisopropylsilylethynyl)-Pentacene Nanofilm Deposited on Octadecyltrichlorosilane Self Assembled Monolayer Surface as a Transistor Channel

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Abstract:

Highly pure 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-PEN) nanofilms were deposited on a hydrophobic OTS-SAM surface at two different substrate temperatures (70 °C and 90 °C) via the vacuum thermal evaporation (VTE) method. X-ray reflectivity measurements over a wide temperature range (30 °C–284 °C) revealed that out-of-plane crystallinity of the film (∼10 nm) remains intact but in-plane crystallinity starts to become poor from ∼100 °C, and to become much more worse from 260 °C. Atomic force microscope images showed that TIPS-PEN films (∼55 nm) prepared at the substrate temperature of 90 °C or above commonly have a number of huge cracks between enormous crystal domains (up to 3 m) whereas the films didn't form such morphology below Ts = 90 °C. These results clearly suggest that an optimum substrate temperature of TIPS-PEN nanofilms on OTS-SAM surface must be somewhere between 70 °C and 90 °C, and the process temperature must be kept below 90 °C in order to form and maintain a highly crystalline film for an organic thin film transistor device since in-plane crystallinity of a semiconductor channel deeply affects the performance of a transistor.

Keywords: BIS(TRIISOPROPYLSILYLETHYNYL)-PENTACENE; FUNCTIONALIZED PENTACENE; ORGANIC SEMICONDUCTOR; ORGANIC THIN FILM TRANSISTOR

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2010.2249

Publication date: 2010-05-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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