Crystal Axis Control of Soluble Organic Semiconductors in Nematic Liquid Crystal Solvents Based on Electric Field

Single crystalline growth of a soluble organic semiconductor in a parallel aligned liquid crystal solvent using rubbing-treated polyimide films

“…Indeed, peeled and movable C 8 -BTBT crystals in the LC cells show three-dimensional crystal habit (they do not show a plate-like shape). 13) When the polarizer was rotated 45°from the rubbing direction, extinction positions in most of the single crystals were uniform. This behavior indicates that the specific crystalline direction of individual single crystals are aligned.…”

“…In previous papers, we reported that the single crystalline growth of organic semiconductors was possible using a nematic-phase LC solvent. 12,13) In the LC cell under the influence of an applied lateral electric field, the C 8 -BTBT single crystals exhibited anisotropic growth and a peeling behavior. 13,14) However, the main factor that determined the anisotropic growth direction of C 8 -BTBT single crystals, such as lateral electric field or LC alignment, was not clear.…”

P-200L:Late-News Poster: Anisotropic Growth and Structural Analysis of Single Crystal Using Liquid Crystal Solvent for Molecular Alignment Controlled Organic Transistors

“…Anisotropic ordered structure as shown in Figure 2 is not attributed to rubbingtreated polyimide films. Second, in order to discuss the effect of LC alignment, we evaluated C 8 BTBT single crystalline films using lateral field on glass surface without polyimide film [6]. There is no ordering of extinction position and geometric shape of crystals.…”