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Self-aligned patterning of conductive films on plastic substrate for electrodes of flexible electronics

Abstract

We report a reliable and low-cost self-aligned patterning process for formation of conducting polymer electrodes with a high resolution on plastic flexible substrates. To realize the high resolution and self-aligned patterning on the poly (ethylene 2, 6-naphthalate) substrate, hydrophilic hydroxyl anchoring groups are formed by the photo chemical oxidization reaction of ammonium persulfate salt. Next, the hydrophobic octadecyltrichlorosilane (OTS) self-assembled monolayer is formed by immersing the substrate into an OTS solution. The selective UV/Ozone of 171-nm wavelength irradiation through a shadow mask can define the OTS SAM as surface hydroxyl groups on the PEN surface by breaking the chemical bond between the OTS and the hydroxyl group. The selective irradiation process provides the formation of distinct hydrophilic (OH) and hydrophobic (OTS) surfaces with a resolution of 60 μm. As a conducting ink, poly (3, 4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is coated and self-aligned on the patterned arrays for the source/drain (S/D) electrodes of organic field-effect transistors (OFETs). Finally, using the recent widely used organic semiconductors such as poly (3-hexylthiophene), [poly-[2,5-bis(2-octyldodecyl)-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dionel-alt-thieno[3,2-b]thiophene], and poly{[N,N'bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)}, we demonstrate the p-channel, n-channel, and ambipolar OFETs with a self-aligned PEDOT:PSS electrode of 50~100-μm channel length. All OFETs show a reasonably high and comparable field-effect mobility compared to identical devices with Au electrodes.

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Supplementary files

Publication details

The article was received on 06 Aug 2017, accepted on 05 Oct 2017 and first published on 06 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC03532B
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Self-aligned patterning of conductive films on plastic substrate for electrodes of flexible electronics

    M. D. Mamo, E. S. Shin and Y. Noh, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03532B

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