研究目的
To fabricate and characterize organic field-effect transistors (OFETs) based on blend films of TIPS pentacene and polystyrene prepared by electrostatic spray deposition, focusing on the formation of a sharp phase-separated interface and its impact on device performance and stability.
研究成果
The TIPS pentacene/PS blend films prepared by ESD exhibited well-defined vertical phase separation without additional treatments, leading to OFETs with high mobility (0.43 cm2/V·s) and operational stability. This demonstrates the potential for high-speed production of high-performance OFETs using a facile one-step process.
研究不足
The study notes that the phase-separation phenomenon might be influenced by molecular weight and solubility parameters, and further investigation with different solvents and molecular weights is needed. The PS films showed thickness distribution, indicating potential issues with uniformity.
1：Experimental Design and Method Selection:
The study used electrostatic spray deposition (ESD) to prepare blend films, chosen for its ability to deposit films selectively with high efficiency and without post-drying treatments. The method involves electrospraying a solution to generate monodisperse droplets.
2：Sample Selection and Data Sources:
Heavily doped n-type Si substrates with 300-nm thick SiO2 were used as bottom-gate electrodes. Blend solutions of TIPS pentacene (0.1 wt%) and PS (0.3 wt%) in a mixed solvent of 1,2-dichlorobenzene and acetone were prepared.
3：1 wt%) and PS (3 wt%) in a mixed solvent of 1,2-dichlorobenzene and acetone were prepared.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes an ESD system with a syringe pump, spray nozzle, and high-voltage source; polarized optical microscope (Eclipse E600, Nikon); field-effect scanning electron microscope (FE-SEM S-5200, Hitachi); Keithley 2612B source-measure unit. Materials include TIPS pentacene, polystyrene (polymerization degree 1600-1800), solvents (1,2-dichlorobenzene, acetone), Au for electrodes.
4：Experimental Procedures and Operational Workflow:
Substrates were cleaned and treated with UV/ozone. The blend solution was electrosprayed at a feed rate of 0.8-1.2 ml/min, nozzle inner diameter 250 μm, distance 5 cm, applied voltage 8 kV, substrate temperature 50°C, deposition time 2 min. Au electrodes were thermally evaporated. Electrical characteristics were measured in ambient air.
5：8-2 ml/min, nozzle inner diameter 250 μm, distance 5 cm, applied voltage 8 kV, substrate temperature 50°C, deposition time 2 min. Au electrodes were thermally evaporated. Electrical characteristics were measured in ambient air.
Data Analysis Methods:
5. Data Analysis Methods: Morphology was analyzed using polarized optical microscopy and FE-SEM. Electrical performance was evaluated from drain current-voltage measurements, with mobility calculated from transfer characteristics.
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