研究目的
To pattern terthiophene derivative smectic liquid crystals into uniform aligned single crystal microstripes at low temperature for OFETs with high carrier mobility, addressing the challenge of forming large-area single crystals aligned in a desirable direction.
研究成果
The study demonstrates a facile method for patterning highly ordered microstripes of terthiophene derivatives at crystal temperature, achieving high carrier mobility in OFETs. This approach avoids the need for high-temperature annealing and enables cost-effective fabrication, with potential applications in organic electronics such as photovoltaics and light-emitting diodes.
研究不足
The method may be limited by the solubility and processibility of the terthiophene derivatives, as seen with TTP-11OH which has poor solubility leading to discontinuous microstripes. Higher temperatures induce defects and reduce carrier mobility. The technique requires specific substrate treatments and controlled environmental conditions.
1：Experimental Design and Method Selection:
A dewetting method in a sandwich system was used to pattern terthiophene derivatives into microstripes. The method involves confining an organic solution between a superhydrophobic silicon pillar template and a superhydrophilic SiO2/Si substrate, followed by controlled evaporation at different temperatures to achieve alignment.
2：Sample Selection and Data Sources:
Four ω,ω′-terthiophene derivatives (8-TTP-8, 12-TTP-12, 12-TTP-11OH, TTP-11OH) were used, supplied by Chuo University with 99% purity. Chlorobenzene was used as the solvent.
3：List of Experimental Equipment and Materials:
Equipment includes oxygen plasma instrument (DT-03), FESEM (Hitachi S-4800), POM (Carl Zeiss Axio Vision SE64), AFM (Digital Instruments Multimode AFM, Nanoscope IIIa), XRD systems (Philips1825 and Bruker D8 Discover), and Keithley 4200 SCS semiconductor parameter analyzer. Materials include silicon pillar templates, SiO2/Si substrates, and various chemicals for surface treatment.
4：Experimental Procedures and Operational Workflow:
A 10 μL of 20 mg mL?1 terthiophene chlorobenzene solution was dropped on a superhydrophobic silicon pillar template, covered with a superhydrophilic SiO2/Si substrate to form a sandwich system. The system was placed in an oven at different temperatures (25-120 °C) for 48 hours to allow solvent evaporation and dewetting. Afterward, the aligned microstripes were peeled off from the template.
5：Data Analysis Methods:
Morphology was characterized using POM, FESEM, OM, and AFM. Molecular orientation was studied with POM and XRD. FET characteristics were measured with a Keithley 4200 SCS analyzer, and mobility was calculated from transfer characteristic curves.
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