Effect of Dielectric Roughness on Performance of Pentacene TFTs and Restoration of Performance with a Polymeric Smoothing Layer
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- 6 May 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 109 (21) , 10574-10577
- https://doi.org/10.1021/jp044318f
Abstract
The morphology, structure, and transport properties of pentacene thin film transistors (TFTs) are reported showing the influence of the gate dielectric surface roughness. Upon roughening of the amorphous SiO2 gate dielectric prior to pentacene deposition, dramatic reductions in pentacene grain size and crystallinity were observed. The TFT performance of pentacene films deposited on roughened substrates showed reduced free carrier mobility, larger transport activation energies, and larger trap distribution widths. Spin coating roughened dielectrics with polystyrene produced surfaces with 2 Å root-mean-square (rms) roughness. The pentacene films deposited on these coated surfaces had grain sizes, crystallinities, mobilities, and trap distributions that were comparable to the range of values observed for pentacene films deposited on thermally grown SiO2 (roughness also ∼2 Å rms).Keywords
This publication has 25 references indexed in Scilit:
- Gated four-probe measurements on pentacene thin-film transistors: Contact resistance as a function of gate voltage and temperatureJournal of Applied Physics, 2004
- Threshold voltage shift in organic field effect transistors by dipole monolayers on the gate insulatorJournal of Applied Physics, 2004
- Effect of impurities on the mobility of single crystal pentaceneApplied Physics Letters, 2004
- Control of carrier density by self-assembled monolayers in organic field-effect transistorsNature Materials, 2004
- Structural Characterization of a Pentacene Monolayer on an Amorphous SiO2 Substrate with Grazing Incidence X-ray DiffractionJournal of the American Chemical Society, 2004
- High-Performance OTFTs Using Surface-Modified Alumina DielectricsThe Journal of Physical Chemistry B, 2003
- Pentacene thin film transistors on inorganic dielectrics: Morphology, structural properties, and electronic transportJournal of Applied Physics, 2003
- High-mobility polymer gate dielectric pentacene thin film transistorsJournal of Applied Physics, 2002
- Pentacene organic thin-film transistors for circuit and display applicationsIEEE Transactions on Electron Devices, 1999
- Morphological Origin of High Mobility in Pentacene Thin-Film TransistorsChemistry of Materials, 1996