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Experiment and simulation calculation of micro-cavity dielectric barrier discharge
摘要： In order to study the discharge mechanism and discharge parameters evolution of micro-cavity dielectric barrier discharge(MDBD), an experimental platform based on the dielectric panel surface grid micro-structure electrode device was built. Discharge equivalent circuit of the MDBD was established based on the deep analysis of the discharge physical process and experimental results. Then, using Matlab/Simulink and BOLSIG+ software， we solved the Kirchhoff’s voltage equation, Boltzmann equation and the electronic continuity equation to obtain the variation of the discharge characteristic parameters, including air gap voltage, the dielectric surface voltage, the electron density and the electron temperature. The results show that the gas gap voltage and dielectric surface voltage are decreased slightly during discharge, the electron temperature and electron density are consistent with the variation of discharge current. The maximum electron temperature is about 3.0eV, the average value is about 1.6eV, and its value is lower than the conventional dielectric barrier discharge(DBD).
关键词： Micro-cavity,Electron Temperature,Dielectric Barrier Discharge,Gas Gap Voltage,Electron Density
更新于2025-09-23 15:21:21
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Electro-optically efficient and thermally stable multilayer semitransparent pristine Ag cathode structure for top emission organic light emitting diodes
摘要： To attain high efficiency and stability in a top-emission organic light-emitting diode (TEOLED), the semitransparent metal cathode must have high transmittance, low absorbance, and uniform surface properties under continuous driving conditions. However, conventional semitransparent metal electrodes have numerous fundamental issues. Here, we report an electro-optically efficient and stable semitransparent pristine thin Ag cathode configuration for the high performances of TEOLED. A multilayer semitransparent cathode structure is fabricated by sandwiching a thin silver (Ag) layer between new organic wetting inducer and capping layer, 1,4-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (p-bPPhenB). A thin Ag layer in the presence of p-bPPhenB exhibits superior optical and electrical properties including a high transmittance of 83.8% at 550 nm, low absorbance of 7.65% at 550 nm, and the low sheet resistance of 2.1 Ω/□, respectively, at room temperature and even under 110 OC for 100 hours. It is observed that our organic wetting inducer and capping layer, p-bPPhenB has considerable influence on the stabilization of surface properties of the thin Ag film by forming coordination bond between the Ag atoms and nitrogen atoms of p-bPPhenB through donating unshared electrons to the Ag atom. An optically optimized phosphorescent green TEOLED with this pure Ag cathode configuration enables a low driving voltage of 5.0 V at 10 mA/cm2 and remarkably high maximum current efficiency of about 167 cd/A compared with the Mg:Ag (10:1) cathode (5.4 V and 109 cd/A).
关键词： micro-cavity effect,organic wetting inducer,semitransparent pristine silver cathode,top-emitting organic light emitting diode,thermal stability
更新于2025-09-16 10:30:52
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Near-infrared polymer light-emitting diodes based on an inverted device structure
摘要： Near-infrared polymer light-emitting diodes (NIR-PLEDs) possess great potential in applications ranging from night-vision device to optical communications. Here we obtained NIR emission from normal red fluorescent polymers by using an inverted device structure with the aid of micro-cavity effects. By tuning the thickness of the emissive layer, the inverted NIR-PLED based on PPF-FSO15-DHTBT10 and MEH-PPV got a near-infrared emission with the main peak located at 700 nm and 706 nm, and the maximum external quantum efficiency (EQEmax) of 0.54% and 1.03%, respectively. The increase of emissive layer thickness caused the relative variation of recombination area, which led to the widely controlling of EL spectra in the inverted device. These results reveal that tuning EL spectrum utilized by inverted device structure would be a promising method to realize near-infrared emission.
关键词： emissive layer thickness,micro-cavity effects,inverted device structure,Near-infrared polymer light-emitting diodes,external quantum efficiency
更新于2025-09-11 14:15:04
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Photonic enhancement of parallel homo-tandem solar cells through the central electrode
摘要： Improvement of solar cell performance through the parallel homo-tandem architecture is studied. The cell geometry is optically designed to maximize absorption of the AM1.5 spectrum. We consider both ITO electrode and a recently devised ITO-free alternative, the Two-Resonance Tapping Cavity. The optimal geometry strongly depends on this choice. We identify two mechanisms by which tandem cells outperform single cells: (i) back-up absorption and (ii) interferometric gain mediated by the central metallic electrode. We numerically demonstrate large improvement in short-circuit current for a wide choice of realistic materials: PTB7-th:PC71BM, P3HT:PC61BM, DBP:C70, and methylammonium lead halide perovskite, as well as a theoretical material with a Shockley-Queiser type of spectral absorption plus an Urbach tail. Such an idealized response is found to reliably model real materials. A general response pattern is found that fits all the cases covered in our study, and which can serve as a guide to optimize homo-tandem cells.
关键词： Homo-tandem solar cells,ITO,TRTC,Photon management,Micro-cavity
更新于2025-09-11 14:15:04
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Multiple Fano Resonance Based Optical Refractive Index Sensor Composed Of Micro-Cavity and Micro-Structure
摘要： A multiple Fano resonance based optical refractive index sensor composed of micro-cavity and micro-structure is designed. The multiple Fano resonances, generated by the interference between the multiple resonant peaks produced by the micro-cavity and the continuous background produced by the micro-structure, can reach high sensitivity in refractive index measurement. Besides, the micro-cavity con?guration obviously reduces the energy loss, thus effectively increasing the ?gure of merit. Adjusted by the micro-cavity thickness and the micro-structure con?guration, multiple Fano resonances can be generated potential for refractive index sensing: the sensitivity of 831 nm/RIU and the ?gure of merit of ～600 can be reached according to a single Fano resonance; moreover, spectral interval between double Fano resonances can also be used for refractive index sensing with the sensitivity of 194 nm/RIU but signi?cantly reducing the error due to the environmental changes. Considering the advantages as high sensitivity, narrow Fano resonant peak, high ?gure of merit and ease of integration, as well as its potential in environmental error reduction, the proposed multiple Fano resonance based optical refractive index sensor is expected to provide new tactics for optical refractive index sensing.
关键词： Refractive index sensor,micro-structures,micro-cavity,multiple Fano resonance
更新于2025-09-09 09:28:46
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[IEEE 2018 International Conference on Optical MEMS and Nanophotonics (OMN) - Lausanne (2018.7.29-2018.8.2)] 2018 International Conference on Optical MEMS and Nanophotonics (OMN) - Energy-Efficient Silicon Photonic Crystal Nanocavity Modulator Driven by Indium Oxide Gate
摘要： We report an ultra-energy-efficient silicon photonic crystal nanocavity modulator driven by a metal-oxide-semiconductor (MOS) capacitor consisting of In2O3/HfO2/p-Si stacked film, which yields an ultra-high tuning efficiency of 250pm/V, a strong modulation strength of 4dB/V by a 0.35μm electrode, and a low energy consumption of 3fJ/bit.
关键词： micro-cavity,photonic crystals,waveguide modulators
更新于2025-09-09 09:28:46