研究目的
To demonstrate low-temperature solution-processed organic field-effect transistors (OFETs) using fully imidized soluble polyimide (PI) gate dielectrics, overcoming the limitations of high processing temperature and high surface energy for flexible and reliable electronic applications with low-cost manufacturing.
研究成果
The research successfully demonstrated low-temperature solution-processed OFETs using soluble PI gate dielectrics, which are fully imidized during synthesis, eliminating the need for high-temperature annealing. PS blending improved TIPS-pentacene crystallinity, enhancing device performance and reliability. Integration with ultrathin parylene substrates showed excellent mechanical flexibility without performance degradation, offering a viable path for flexible and cost-effective electronic applications.
研究不足
The study may have limitations in scalability for large-area manufacturing, potential variability in device performance due to fabrication issues like electrode misalignment, and the need for further optimization of the PS blending ratio for different semiconductor materials. The use of specific solvents and materials might restrict compatibility with other low-cost substrates.
1:Experimental Design and Method Selection:
The study involved fabricating OFETs and metal-insulator-metal (MIM) capacitors using soluble PI gate dielectrics processed at low temperatures (25°C to 200°C). Methods included spin-coating, printing, thermal evaporation, and characterization techniques to assess dielectric properties, electrical characteristics, and crystallinity.
2:Sample Selection and Data Sources:
Samples included soluble PI thin films, TIPS-pentacene and TIPS-pentacene:PS blend thin films, fabricated on glass or parylene substrates. Data were sourced from electrical measurements, microscopy, spectroscopy, and diffraction analyses.
3:List of Experimental Equipment and Materials:
Equipment included a stylus surface profiler (DektakXT, Bruker), semiconductor parameter analyzer (4200-SCS, Keithley), precision LCR meter (ZM2376, NF Corporation), atomic force microscope (Veeco Dimension 3100 + Nanoscope V), FTIR spectroscopy (VERTEX 80, Bruker), high-resolution XRD (X’pert PRO MRD, Phillips), polarized optical microscope (Leica DM2700, Leica), and dispenser equipment (Musashi Engineering, Image Master 350 PC). Materials included parylene C (diX-C, Daisankasei Co., Ltd.), Cytop (CTL-809M, Asahi Glass), TIPS-pentacene (>99.9%, Ossila), polystyrene (MW ~280,000, Sigma-Aldrich), mesitylene (98%, Sigma-Aldrich), aluminum, silver, and solvents like γ-butyrolactone.
4:9%, Ossila), polystyrene (MW ~280,000, Sigma-Aldrich), mesitylene (98%, Sigma-Aldrich), aluminum, silver, and solvents like γ-butyrolactone. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Fabrication steps involved depositing gate electrodes by thermal evaporation, spin-coating soluble PI gate dielectrics at varying annealing temperatures (25°C, 75°C, 150°C, 200°C), printing bank and semiconductor layers using dispenser equipment, annealing for crystallization, and evaporating source/drain electrodes. Electrical and material characterizations were performed under ambient or controlled conditions.
5:Data Analysis Methods:
Data analysis included extracting electrical parameters (e.g., threshold voltage, field-effect mobility) using standard equations, analyzing dielectric properties from capacitance and leakage current measurements, and evaluating crystallinity and morphology through AFM, FTIR, XRD, and POM.
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Stylus surface profiler
DektakXT
Bruker
Measuring the thickness of thin films
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Semiconductor parameter analyzer
4200-SCS
Keithley
Measuring electrical characteristics of OFETs
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Atomic force microscope
Veeco Dimension 3100 + Nanoscope V
Digital Instruments/Veeco Metrology Group
Recording AFM images in tapping mode
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FTIR spectroscopy
VERTEX 80
Bruker
Collecting infrared spectra
VERTEX 80 & 80v FT-IR Spectrometers
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Polarized optical microscope
Leica DM2700M
Leica
Recording TIPS-pentacene thin film crystallinity
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Precision LCR meter
ZM2376
NF Corporation
Measuring capacitance of MIM capacitors
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High-resolution X-ray diffraction
X’pert PRO MRD
Phillips
Analyzing crystalline structure of thin films
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Dispenser equipment
Image Master 350 PC
Musashi Engineering
Printing bank and semiconductor layers
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Parylene C
diX-C
Daisankasei Co., Ltd.
Used as an ultrathin flexible substrate
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Cytop
CTL-809M
Asahi Glass
Used for the bank layer
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TIPS-pentacene
Ossila
Used as organic semiconductor
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Polystyrene
Sigma-Aldrich
Blended with TIPS-pentacene to improve crystallinity
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Mesitylene
Sigma-Aldrich
Solvent for TIPS-pentacene and PS blends
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