Figure 1
From: Solution-processed, Self-organized Organic Single Crystal Arrays with Controlled Crystal Orientation
Organic single crystal arrays on the patterned Cytop substrate.
(a) Schematic outline of the fabrication of self-aligned organic single crystal arrays. The wettable trenches are formed by patterning an anisole-unwettable 100-nm-thick Cytop layer using a standard photolithographic technique. A solution of C8-BTBT/PMMA in anisole is applied but remains only in the wettable trenches, because the surrounding Cytop region repels it. During PASVA with chloroform, the C8-BTBT film becomes recrystallized into single crystal arrays with the same orientation. The insert is the molecular structure of C8-BTBT. (b) Organic single crystals fabricated by the present method. The polarized optical micrograph shows the crystals are fabricated only in the trenches and have the same crystal orientation. The surface profile shows that the typical thickness of the crystals is about 250 nm.
