Abstract
In the current work, we carry out an analysis on micro-patterned 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) crystals grown by capillary force lithography (CFL) to investigate the effect of lateral confinement on the crystallization. From systematic analysis on the crystal orientation and crystallinity depending on the line widths of the crystal patterns, it is revealed that crystals grown from highly confined conditions, namely from patterns with line widths of 5 μm, are observed to be more uniaxially aligned, have much fewer grain boundaries, and yield better field-effect mobility (μFET) as high as 1.66 cm2/(V s) in organic field-effect transistors (OFETs) compared to the wider line widths. These results demonstrate that the lateral confinement during CFL is able to promote the growth of well-aligned TIPS-pentacene crystals with high crystallinity. Thus, we expect our systematic work with CFL, a type of soft lithography, could provide insight for OFETs to step toward their integration in commercial devices.
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