研究目的
To develop a facile method for fabricating large-area two-dimensional crystalline organic films and apply it to high-performance organic field-effect transistors.
研究成果
The tilted spin coating method enables the fabrication of high-quality, large-area 2D crystalline organic films with ideal transistor behaviors, achieving high mobilities and reliability factors, making it suitable for solution-processed organic electronics.
研究不足
The method may not be easily scalable to large-area substrates above 50 mm diameter due to equipment constraints, and non-ideal behaviors in some devices indicate interfacial defects.
1:Experimental Design and Method Selection:
The study uses tilted spin coating to create oriented flow for crystallization, with simulations using COMSOL Multiphysics to model droplet behavior and evaporation flux.
2:Sample Selection and Data Sources:
C8-BTBT semiconductor dissolved in solvents (anisole/DMF or chlorobenzene) is used, deposited on SiO2/Si or PEN substrates with surface modifications.
3:List of Experimental Equipment and Materials:
Includes spin coaters, UV/O3 cleaner, AFM, XRD, semiconductor analyzer, and materials like C8-BTBT, Au nanoparticles, Parylene-C, Cytop.
4:Experimental Procedures and Operational Workflow:
Substrates are cleaned, solutions are dropped and spun at various tilt angles and speeds, followed by electrode deposition and electrical characterization.
5:Data Analysis Methods:
Mobility and reliability factors are extracted from transfer characteristics using standard equations, with DOS analysis for transport properties.
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X-ray diffraction
Rigaku Rint-2200
Rigaku
X-ray diffraction analysis for crystallinity
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Semiconductor device analyzer
Agilent B1500A
Agilent
Electrical characterization of transistors
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UV/O3 cleaner
PL17-110
SEN LIGHTS
Cleaning substrates by ultraviolet and ozone treatment
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AFM
NTEGRA Spectra
Atomic force microscopy for high-resolution imaging
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High-resolution AFM
Asylum Cypher
High-resolution atomic force microscopy
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Surface profiler
Dektak 150
Measuring film thickness
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Polarized microscope
Nikon Eclipse LV100N
Nikon
Optical microscopy with polarization for crystal imaging
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COMSOL Multiphysics
COMSOL
Simulation software for modeling droplet behavior and evaporation
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