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A simple, low cost ink system for Drop-On-Demand printing high performance metal oxide dielectric film at low temperature
摘要： We have successfully developed an ink system containing cheap raw materials through a simple process and have printed ZrOx dielectric film at a relatively low annealing temperature of 250 °C. The ZrOx dielectric film afforded a leakage current density of 5.4×10-6 A/cm2 at 1 MV/cm and a dielectric constant of 10, which shows promising future for flexible electronics. The ink system shows a temperature-induced gelation behavior and gel network is formed when temperature rises. A high concentration of oxide precursors is obtained near the network area through the absorption function of polymer groups, and thus oxide structure can be formed at a relatively low temperature due to the shorter diffusion path of precursor polymerization. The microstructure of printed ZrOx film was investigated by High Resolution Transmission Electron Microscope (HRTEM), Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), and the effect of annealing temperature on film structure was studied.
关键词： dielectric film,low temperature,Low cost,ink system,Drop-On-Demand printing
更新于2025-09-23 15:23:52
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Large-area High-contrast Hydrophobic/Hydrophilic Patterned Surface for Robust Electrowetting Devices
摘要： Hydrophobic/hydrophilic patterned surfaces (HHPS) are found in nature, and highly desired for practical applications as well. Building hydrophilic patterns firmly on low free energy hydrophobic coatings has been a long-term challenge. Conventional process of reactive ion etching combined with a thermal reflow (RIE-reflow) process results in degradation of both the hydrophobicity and dielectric strength of the hydrophobic coatings. In this work, we propose a reconstructive approach by encapsulating the “damaged” hydrophobic Teflon AF 1600 (AF) surface with a fresh one to keep its hydrophobicity the same as a virgin AF surface; and at the same time, enhance the hydrophilicity of patterned microstructures by local plasma etching method with a self-assembled protection mask. In this way, the extremely high wettability contrast with a large oil/water contact angle difference (Δθo/w) of 175o is reached between the hydrophobic and hydrophilic surfaces. Comparing to the conventional RIE-reflow process, the AF films prepared by this reconstruction process show superior dielectric strength and surface hydrophobicity. Electrowetting display devices constructed by this process demonstrate improved optical and electrical performance, presenting a more uniform pixel aperture ratio, higher voltage tolerance, and less leakage current compared to those made using the conventional “RIE-reflow” process.
关键词： electronic devices,large-area fabrication,hydrophobic/hydrophilic pattern,dielectric film,electrowetting,wettability contrast
更新于2025-09-19 17:15:36
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[IEEE 2019 IEEE International Meeting for Future of Electron Devices, Kansai (IMFEDK) - Kyoto, Japan (2019.11.14-2019.11.15)] 2019 IEEE International Meeting for Future of Electron Devices, Kansai (IMFEDK) - Invited: Polymer Light-Emitting Devices with Selectively Transparent Photonic Crystals Consisting of Printed Inorganic/Organic Hybrid Dielectric Films
摘要： Selectively transparent photonic crystals consisting of printed inorganic/organic hybrid dielectric films based on inorganic copper(I) thiocyanate can be produced to exhibit intense Bragg peaks over their stop band in the visible region. This work exhibits a unique approach to achieve the improvement of color purity and the strong directed emission pattern for polymer light-emitting diodes and AC-driven electroluminescent devices with printed inorganic/organic hybrid dielectric mirrors, which will be important for all-printed microlight sources.
关键词： photonic crystal,dielectric film,distributed Bragg reflector,inorganic/organic hybrid film,polymer light-emitting device,solution process
更新于2025-09-16 10:30:52
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Terahertz sensing of 7?nm dielectric film with bound states in the continuum metasurfaces
摘要： The fingerprint spectral response of several materials with terahertz electromagnetic radiation indicates that terahertz technology is an effective tool for sensing applications. However, sensing few nanometer thin-films of dielectrics with much longer terahertz waves (1 THz = 0.3 mm) is challenging. Here, we demonstrate a quasibound state in the continuum (BIC) resonance for sensing of a nanometer scale thin analyte deposited on a flexible metasurface. The large sensitivity originates from the strong local field confinement of the quasi-BIC Fano resonance state and extremely low absorption loss of a low-index cyclic olefin copolymer substrate. A minimum thickness of 7 nm thin-film of germanium is sensed on the metasurface, which corresponds to a deep subwavelength scale of k/43 000, where k is the resonance wavelength. The low-loss, flexible, and large mechanical strength of the quasi-BIC microstructured metamaterial sensor could be an ideal platform for developing ultrasensitive wearable terahertz sensors.
关键词： metasurfaces,bound states in the continuum,sensing,terahertz,dielectric film
更新于2025-09-16 10:30:52