研究目的
To improve the electrical performance of stretchable semiconducting polymers by achieving multi-scale ordering and alignment to enhance charge carrier mobility while maintaining stretchability.
研究成果
The combination of solution shearing with a patterned microtrench blade and nanoconfinement effects achieves multi-scale ordering in stretchable semiconducting polymers, leading to substantially improved charge carrier mobility (up to threefold enhancement) and maintained performance under 100% strain. This approach is scalable to large-area manufacturing via roll-to-roll coating, offering a pathway for high-performance, low-cost stretchable electronics.
研究不足
The phase-separation process during drying is complex and influenced by multiple factors, which is not fully understood and beyond the scope of this study. The method may have limitations in achieving uniform alignment on rough substrates, as seen in roll-to-roll coating where performance is reduced due to lower alignment and substrate roughness.
1：Experimental Design and Method Selection:
The study employs a solution-shearing method using a microtrench-patterned blade to align conjugated polymers, combined with nanoconfinement effects (CONPHINE methodology) to achieve multi-scale ordering. This includes optimizing parameters such as solution concentration, shear speed, and temperature.
2：Sample Selection and Data Sources:
Five different conjugated polymers, including DPPDTSE, are used with SEBS elastomer. Films are fabricated via solution shearing and spin coating for comparison. Data sources include morphological and electrical characterizations.
3：List of Experimental Equipment and Materials:
Equipment includes microtrench-patterned blades, heating plates, cross-polarized optical microscope, AFM, GIXD, XPS, UV-vis spectroscope, TFT devices, and roll-to-roll coater. Materials include conjugated polymers, SEBS, solvents (e.g., chlorobenzene), and substrates (e.g., Si/SiO2, PET).
4：Experimental Procedures and Operational Workflow:
Substrates are prepared with OTS modification. Solution shearing is performed at optimized conditions (e.g., 30 mg ml?1 concentration, 3 mm s?1 speed, 50°C temperature). Films are annealed and characterized using microscopy, spectroscopy, and electrical measurements. Roll-to-roll coating is used for large-scale fabrication.
5：Data Analysis Methods:
Data analysis involves dichroic ratios from polarized UV-vis, GIXD for crystalline ordering, AFM for morphology, and electrical measurements (mobility, activation energy) using Keithley analyser and Arrhenius plots.
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Atomic Force Microscope
Multimode Nanoscope III
Digital Instruments/Veeco Metrology Group
Characterization of film morphology and thickness using tapping-mode AFM.
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UV/vis/NIR Spectroscope
Cary 6000i
Agilent
Measurement of ultraviolet–visible absorption spectra, including polarized absorption for alignment analysis.
Cary 60 UV-Vis Spectrophotometer
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Optical Microscope
DM4000M
Leica
Cross-polarized optical microscopy for qualitative long-range ordering analysis.
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Semiconductor Parameter Analyzer
4200
Keithley
Electrical characterization of transistors, including transfer and output curves.
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X-ray Photoelectron Spectroscope
VersaProbe 3
PHI
Surface chemical analysis of films using XPS.
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Roll-to-roll Coater
Large-area fabrication of stretchable semiconducting films using slot die coater and microtrench blade.
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Grazing Incidence X-ray Diffractometer
Stanford Synchrotron Radiation Light Source
Investigation of crystalline ordering in films using GIXD.
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Heating Plate
Substrate heating during solution shearing to control drying and alignment.
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Microtrench-patterned Blade
Solution shearing tool with microtrenches to generate unidirectional flow for polymer alignment.
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Syringe Pump
Feeding ink during roll-to-roll coating process.
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