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A Patterning Process for Organic Thin Films Using Discharge and Suction Needles  

Kim, Daeyeob (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Shin, Dongkyun (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Lee, Jinyoung (Interdisciplinary Program in Creative Engineering, Korea University of Technology and Education)
Park, Jongwoon (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Semiconductor & Display Technology / v.19, no.1, 2020 , pp. 79-84 More about this Journal
Abstract
Unlike a printing process, it is difficult to pattern organic thin films in the longitudinal (coating) direction using a coating process. In this paper, we have investigated the feasibility of patterning organic thin films using needles. To this end, we have slot-coated an aqueous poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) solution in the form of a fine stripe or large area and then applied the dual needle; one for discharging the main solvent of the underlying thin film and the other for sucking the dissolved thin film. We have found that the pattern width and depth increase as the moving speed of the plate decreases. However, it is observed that the sidewall slope is very gentle (the length of the slope is of the order of 200 ㎛) due to the fact that the discharged main solvent is widely spread and then isotropic etching occurs. With this scheme, we have also demonstrated that a fine stripe can be obtained by scanning the dual needle closely. To demonstrate its applicability to solution-processable organic light-emitting diodes (OLEDs), we have also fabricated OLED with the patterned PEDOT:PSS stripe and observed the insulation property in the strong light-emitting stripe.
Keywords
Patterning process; Discharge needle; Suction needle; Organic thin film; OLED;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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