Directed self-assembly of organic semiconductors via confined evaporative capillary flows for use in organic field-effect transistors

Title
Directed self-assembly of organic semiconductors via confined evaporative capillary flows for use in organic field-effect transistors
Authors
김도환임정아차원석이정헌김현정조정호
Keywords
self-assembly; Confined evaporative capillary flow; organic semiconductor; organic field-effect transistors
Issue Date
2014-10
Publisher
Organic electronics
Citation
VOL 15, NO 10, 2322-2327
Abstract
We fabricated well-defined 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-PEN) crystal arrays for use in electronic applications via a simple but effective method, the confined evaporative capillary flow (CEC) method. This has been accomplished by systematically controlling the contact line pinning at the edge of glass stylus and the outward hydrodynamic flow within the drying droplet with various processing solvents and surface properties of the substrate during solidification. We found that after CEC coating of TIPS-PEN solution dissolved into toluene onto SiO2 surface, ribbon-shaped TIPS-PEN crystals were well developed with a width of 20–100 μm and length of 300 μm – 2 mm, which is presumably owing to optimized capillary evaporation. Specifically, TIPS-PEN crystals present highly preferred crystal orientation along the (l 0 0) axis, which can lead to efficient charge transport in a lateral direction. Thus, TIPS-PEN field-effect transistors (FETs) exhibited a good hole mobility of 0.72 cm2/Vs.
URI
http://pubs.kist.re.kr/handle/201004/47923
ISSN
15661199
Appears in Collections:
KIST Publication > Article
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