Presentation Information
[9p-PB1-4]Control of Surface Free Energy Using Organic Monolayers for Solution Processing
〇Kai Kishimura1, Yih-Ren Chang1, Masatoshi Kitamura1, Yoshiaki Hattori1 (1.Kobe Univ.)
Keywords:
organic monolayer
Organic thin-film transistors (OTFTs) are attractive for flexible electronics because they can be fabricated at low temperatures and low cost. In this study, substrates were modified with various organic monolayers to achieve both favorable wettability and uniform organic semiconductor film formation. Surface free energy was evaluated from water and diiodomethane contact angles using the Owens–Wendt method. Dynamic wettability was investigated by observing the behavior of p-xylene droplets on tilted substrates. Ph-BTBT-C10 films were deposited by hot spin coating from a 0.5 wt% p-xylene solution at 100 °C. Bare, PTS-, and PFPTS-modified substrates exhibited excellent wettability and enabled uniform film formation, whereas HMDS, HDTMS, and FAS-13 substrates showed poor wettability and non-uniform films. These results demonstrate that appropriate surface-energy control by SAM modification is essential for solution-processed OTFT fabrication.