Combining Vapor Phase Polymerization and Screen Printing for Printed Electronics on Flexible Substrates. Issue 7 (7th January 2022)

• Record Type: Journal Article
• Authors: Brooke, Robert; Wijeratne, Kosala; Hübscher, Kathrin; Belaineh, Dagmawi; Andersson Ersman, Peter
• Is Part Of: Advanced materials technologies. Volume 7:Issue 7(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-07
• Subjects: organic electrochemical transistors -- PEDOT -- printed electronics -- screen printing -- vapor phase polymerization; Materials science -- Periodicals; Technological innovations -- Periodicals; Materials science; Technological innovations; Periodicals; 620.1105
• DOI: 10.1002/admt.202101665
• Languages: English
• ISSNs: 2365-709X

Abstract

Abstract: Large area manufacturing of printed electronic components on ~A4‐sized substrates is demonstrated by the combination of screen printing and vapor phase polymerization (VPP) into poly(3, 4‐ethylenedioxythiophene) (PEDOT). The oxidant layer required for the polymerization process is screen printed, and the resulting conductive polymer patterns are manufactured at high resolution (100 µm). Successful processing of several common oxidant species is demonstrated, and the thickness can be adjusted by altering the polymerization time. By comparing the polymer films of this work to a commercial PEDOT:PSS (PEDOT doped with poly(styrene sulfonate)) screen printing ink shows improved surface roughness (26 vs 69 nm), higher conductivity (500 vs 100 S cm –1 ) and better resolution (100 vs 200 µm). Organic electrochemical transistors, in which the transistor channel is polymerized into PEDOT through VPP, are also demonstrated to further emphasize on the applicability of this manufacturing approach. The resulting transistor devices are not only functional, they also show remarkable switching behavior with respect to ON current levels (–70 mA at –1 V), ON/OFF ratios (>10 5 ), switching times (tens of ms) and transconductance values (>100 mS) in standalone transistor devices, in addition to a high amplification factor (>30) upon integration into a screen printed inverter circuit. Abstract : Vapor phase polymerization (VPP) of 3, 4‐ethylenedioxythiophene into high‐resolution (100 µm) patterns enables further utilization in various printed electronic applications, here exemplified by organic electrochemical transistors (OECT). The OECT channels are created by the VPP process, while the other layers of the devices are deposited via screen printing, and the resulting OECTs and OECT‐based inverters exhibit excellent switching performance.