cg9b00297_si_001.pdf (187.52 kB)
Single Crystallization of an Organic Semiconductor in Hydrogel Capillaries for Transferring onto Substrates
journal contribution
posted on 2019-05-10, 00:00 authored by Satoshi Watanabe, Ryota Urata, Tetsuya Sato, Shintaro Ida, Masashi KunitakeWe
propose a single crystallization and transfer technique of organic
semiconductors using a hydrogel capillary (gel capillary crystallization
method). Single crystals of the C8-BTBT thienoacene-based organic
semiconductor were prepared by crystal growth in a glass capillary
filled with C8-BTBT solution in the supersaturated condition. By adjusting
the concentration and temperature, selective nucleation was induced
only at the air/liquid interface in the capillary. From the multiple
nuclei generated at the interface, polycrystalline C8-BTBT formed
near the interface. Subsequent continuous crystal growth in the capillary
allowed the polycrystals to transform to a single crystal, because
crystal growth was regulated along one direction in the capillary.
Single-crystal growth was also induced at the air–liquid interface
in an agarose gel capillary, which was made by piercing with a plastic
sheet, similar to that in the glass capillary. After formation of
a single crystal in the gel capillary, the single crystal was removed
from the capillary and transferred onto a solid substrate by dissolution
of the capillary with NaI solution.
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