A5016047872- Silicon and Solar Cell Technologies
- Conducting polymers and applications
- Advanced Memory and Neural Computing
- Organic Electronics and Photovoltaics
- Thin-Film Transistor Technologies
- Transition Metal Oxide Nanomaterials
- solar cell performance optimization
- Organic Light-Emitting Diodes Research
- Advanced Sensor and Energy Harvesting Materials
- Neuroscience and Neural Engineering
- Ferroelectric and Negative Capacitance Devices
- Photovoltaic System Optimization Techniques
- Silicon Carbide Semiconductor Technologies
- Semiconductor materials and interfaces
- Silicon Nanostructures and Photoluminescence
- Nanowire Synthesis and Applications
- Nanomaterials and Printing Technologies
- Advanced Fiber Optic Sensors
- Semiconductor materials and devices
- Photovoltaic Systems and Sustainability
- Luminescence and Fluorescent Materials
- Thermal Radiation and Cooling Technologies
- Advanced Thermoelectric Materials and Devices
- Photonic and Optical Devices
- Advanced Semiconductor Detectors and Materials
Chungbuk National University
2019-2024
Keimyung University
2017-2020
Korea Institute of Industrial Technology
2016-2020
Georgia Institute of Technology
2009-2017
Pukyong National University
2017
Chonnam National University
2017
Air Liquide (United Kingdom)
2010
The poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) film is a promising material for electrodes, biomolecular sensor channels, and probes physiological signals because the electrical conduction of PEDOT:PSS tuned simply through electrochemical reaction with target analyte. However, forming specific morphology or nanostructure on thin films immersed in an aqueous solution still challenge. Herein, we report mechanism stepwise morphological change highly conductive layer...
The asymmetric resistive memory device can be more suitable to reduce the crosstalk effect in a crossbar array. Similarly, this work focused on material and design concept achieve one-directional engineered switching for electronic synapses. pulsed modulated DC sputtered crystalline GaN heterojunction with ITO/ZnO Schottky diode, resulting digital switching. polycrystalline is used top of barrier multistate behavior. synaptic operation helps investigate stable spike-rate-dependent plasticity...
ABSTRACT Plasma‐enhanced chemical vapor deposition (PECVD) SiN films are widely used as antireflection (AR) coating for silicon solar cells and particularly multi‐crystalline hydrogen passivation of bulk defects. In this paper, the detailed optical properties various their effect on cell efficiency in air under glass is evaluated by a combination Monte‐Carlo geometrical ray tracing program, Sunrays, device modeling program PC1D. Maximum module power ethylene vinyl acetate (EVA) encapsulation...
The diversity of brain functions depend on the release neurotransmitters in chemical synapses. back gated three terminal field effect transistors (FETs) are auspicious candidates for emulation biological to recognize proficient neuromorphic computing systems. In order encourage hysteresis loops, we treated bottom side MoTe2 flake with deep ultraviolet light ambient conditions. Here, modulate short-term and long-term memory effects due trapping de-trapping electron events few layers a...
We fabricated a solution-processed semitransparent organic solar cell from transparent conductive polymer electrode. The top metal electrode was replaced with polymer, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). advantage of using the PEDOT:PSS is that (OPV) can be solution process at plastic-compatible low temperature (<200°C). In addition, due to absence an opaque electrode, final OPVs exhibit semitransparency. transmittance (T) OPV adjusted by changing...
The progress of artificial synaptic devices is vital to the realization consciousness effectual bioinspired neuromorphic computing systems. In this study, we fabricated an ITO/ZnO/PTAA/Ag memristor based on a low-cost solution process. device exhibited uniform gradual bipolar resistive switching with excellent endurance and self-rectifying behavior owing bilayer heterojunction structure ZnO/PTAA. growth conducting filament can be efficiently controlled by modulating current compliance...
We investigated a promising, low-cost method for fabrication of semitransparent organic solar cells by mass production. The active layer the was added spray coating with dual action airbrush. solution prepared from rigorously blended poly(3-hexylthiophene-2,5-diyl) (P3HT) and (6,6)-Phenyl-C61 butyric acid methyl ester (PCBM) in 1,2-dichlorobenzene, surface morphology spray-coated depending on concentration P3HT PCBM investigated. semitransparency achieved, came use...
We deposited plasma-enhanced chemical vapor deposition silicon carbon nitride antireflection coating and passivation layers using a silane-free process. used solid polymer source developed at SiXtron Advanced Materials to eliminate the storage handling of dangerous pyrophoric silane gas. ammonia flow rate as control for optical properties in As increases, content, refractive index, extinction coefficient, surface charge density film decrease. At an 3000 sccm, which is similar conventional ,...
We fabricated a Ni/SiO2/Pt resistive random-access memory device referred to as memristor, which demonstrates both volatile and non-volatile switching. A reversible transition between switching is achieved by applying different current compliances (CCs). Volatile was observed when the CC 50 nA, whereas changed 100 nA. The mechanism model can be explained formation rupture of conducting filaments electrochemical metallization effects, are vital in demonstrate simple pulse measurement method...
We report on a new surface modifier which simultaneously improves electrical, optical, and mechanical properties of silver nanowire-based stretchable transparent electrodes. The electrodes treated with 11-aminoundecanoic acid achieve low sheet resistance 26.0 ohm/sq high transmittance 90% an excellent stretchability. These improvements are attributed to the effective formation strong chemical bond between nanowire networks elastomeric substrates by treatment. change optimized...
Solution-processed polymer devices have been studied as a low-cost alternative to the conventional vacuum-processed organic devices. However, forming specific pattern on semiconductor films without costly lithography is still challenging. Herein, we report direct patterning method for optoelectronic devices, which can successfully engrave designated patterns layer regardless of its size and even after device encapsulation. Irradiation 100 ns pulse laser forms high-resolution such...
Abstract We fabricated organic resistive random-access memory (RRAM) devices using a low-cost solution-process method. All the processes were performed at temperatures below 135 °C under ambient atmospheric conditions. The RRAM switching layer was formed from polymer-fullerene bulk heterojunction poly(3-hexylthiophene-2,5-diyl) (P3HT) and (6,6)-phenyl C61 butyric acid methyl ester (PCBM). device exhibited typical nonvolatile bipolar behavior with an ON/OFF ratio of ∼40, but it provided low...
Three dimensional numerical simulations were performed to investigate a novel high efficiency back contact solar cell design with selective emitter. The effect of several physical parameters (bulk lifetime, substrate doping, emitter fraction and surface recombination velocity in the gap between BSF) on performance is explored using SENTAURUS DEVICE <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">¿</sup> program (formerly DESSIS ). It found that...