Thin-Film Morphology of Inkjet-Printed Single-Droplet Organic Transistors Using Polarized Raman Spectroscopy: Effect of Blending TIPS-Pentacene with Insulating Polymer

We report thin-film morphology studies of inkjet-printed single-droplet organic thin-film transistors (OTFTs) using angle-dependent polarized Raman spectroscopy. We show this to be an effective technique to determine the degree of molecular order as well as to spatially resolve the orientation of th...

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Bibliographic Details
Published in:ACS nano 2011-12, Vol.5 (12), p.9824-9835
Main Authors: James, David T, Kjellander, B. K. Charlotte, Smaal, Wiljan T. T, Gelinck, Gerwin H, Combe, Craig, McCulloch, Iain, Wilson, Richard, Burroughes, Jeremy H, Bradley, Donal D. C, Kim, Ji-Seon
Format: Article
Language:English
Subjects:
Addition polymerization
Blending
Computer Peripherals
Electric Conductivity
Equipment Design
Equipment Failure Analysis
Membranes, Artificial
Morphology
Nanostructures - chemistry
Nanostructures - ultrastructure
Organic Chemicals - chemistry
Organosilicon Compounds - chemistry
Orientation
Polymers - chemistry
Polystyrene resins
Raman spectroscopy
Semiconductor devices
Spectrum Analysis, Raman - instrumentation
Spectrum Analysis, Raman - methods
Thin films
Threshold voltage
Transistors
Transistors, Electronic
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Summary:We report thin-film morphology studies of inkjet-printed single-droplet organic thin-film transistors (OTFTs) using angle-dependent polarized Raman spectroscopy. We show this to be an effective technique to determine the degree of molecular order as well as to spatially resolve the orientation of the conjugated backbones of the 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-Pentacene) molecules. The addition of an insulating polymer, polystyrene (PS), does not disrupt the π–π stacking of the TIPS-Pentacene molecules. Blending in fact improves the uniformity of the molecular morphology and the active layer coverage within the device and reduces the variation in molecular orientation between polycrystalline domains. For OTFT performance, blending enhances the saturation mobility from 0.22 ± 0.05 cm2/(V·s) (TIPS-Pentacene) to 0.72 ± 0.17 cm2/(V·s) (TIPS-Pentacene:PS) in addition to improving the quality of the interface between TIPS-Pentacene and the gate dielectric in the channel, resulting in threshold voltages of ∼0 V and steep subthreshold slopes.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn203397m