POS5-0794
Unveiling Diffusion Kinetics in Selective Contact Evaporation Printing for Multi-scale Organic Crystal Architectures
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
seeun kwon (hannam university)
Co-Author(s)
Abstract
we are developing a single-crystal micropatterning process based on C8-BTBT (2,7-dioctyl-[1]benzothieno[3,2-b][1]benzothiophene), a high-mobility p-type organic semiconductor, for the realization of highly integrated organic electronic devices. C8-BTBT single-crystal thin films are first grown on a substrate through a drop-casting method, followed by the formation of prism-shaped micropatterns using solvent diffusion-based soft lithography with a PDMS mold. This process utilizes the solvent diffusion characteristics of PDMS to induce localized rearrangement and pattern formation on the single-crystal surface. Process parameters such as applied pressure, process temperature, and contact time were systematically controlled, and their effects on the width, depth, and morphology of the resulting patterns were investigated. Notably, various micropattern dimensions could be achieved using the same PDMS mold by simply adjusting the process conditions, demonstrating the high design flexibility of this approach without the need for mold redesign or fabrication. In addition, the rapid patterning process suggests strong potential for continuous processing and large-area device fabrication. The fabricated C8-BTBT single-crystal micropatterns were applied as the active layer in organic thin-film transistor (OTFT) arrays, and their electrical characteristics are currently being evaluated using a Keithley 4200 semiconductor parameter analyzer. This study provides an effective processing platform for high-performance and highly integrated organic electronic devices by enabling precise control over channel geometry and structural parameters while preserving the excellent crystallinity of single-crystal organic semiconductors.
