1H nuclear magnetic resonance (NMR) spectrum of OPV in CDCl3 was recorded on a Bruker AVIII 500 MHz NMR spectrometer. The morphology of the as-prepared microwires was characterized by SEM (Hitachi SU8010) and TEM (JEOL JEM-1011). The crystal structure of the microcrystals was examined by SAED (JEOL JEM-1011) and XRD (Japan Rigaku D/max-2500) with Cu Kα radiation (λ = 0.154 nm). Confocal images were recorded with a laser confocal fluorescence microscope (Olympus FV1000-IX81) equipped with a 405-nm laser. The field-effect transistor characteristics were measured at room temperature in air on a Keithley 4200-SCS and micromanipulator 6150 probe station, and the carrier mobility (μ) was extracted from the saturation region through the equation of IDS = (W/2L)Ciμ(VGVT)2, where IDS is the drain current; L and W are the channel length and width of devices, respectively; Ci is the capacitance of the gate dielectric capacitance per unit area; and VT and VG are the threshold voltage and gate voltage, respectively.

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