Journal
ADVANCED MATERIALS INTERFACES
Volume 9, Issue 35, Pages -Publisher
WILEY
DOI: 10.1002/admi.202201789
Keywords
field-effect transistors; organic semiconductors; phase transition; printed electronics; smectic liquid crystals
Funding
- JST CREST from the Japan Science and Technology Agency (JST) [JPMJCR18J2]
- JSPS KAKENHI grants from the Japan Society for the Promotion of Science (JSPS) [JP21K05209, JP20H05867, JP21H05234, JP22H01933]
- Photon Factory Program Advisory Committee [2020S2-001]
- Kao Foundation for Arts and Sciences
- Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
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This study demonstrates the control of long-axis molecular ordering under ambient conditions using unsymmetrically alkylated OSCs with high layered crystallinity, leading to improved hole mobility in transistor characteristics.
Organic semiconductors (OSCs) often exhibit thermotropic liquid-crystalline (LC) phases in which molecular orientational order is partially lost. The formation of a temporary LC state via a solution process is expected to promote printing-based device production, although a method of controlling molecular ordering over LC states has not yet been developed. Here, it is demonstrated that long-axis molecular ordering can be controlled under ambient conditions using unsymmetrically alkylated OSCs with high layered crystallinity. Introducing a small amount of OSC molecules with longer alkyl-chain lengths leads to the conversion of the long-axis disordered phase into a bilayer-type ordered phase with improved hole mobility in the transistor characteristics. Analyses of the entropies of the transitions to the smectic LC phases at elevated temperatures demonstrate that the long-axis molecular ordering can be driven by a balance between intralayer flip-flop motion and core-core interactions through LC phases. The proposed LC-mediated solution processing paves the way toward high-end printed electronics.
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