A5012376571- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Nanomaterials and Printing Technologies
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Thin-Film Transistor Technologies
- Advanced Sensor and Energy Harvesting Materials
- Organic Light-Emitting Diodes Research
- ZnO doping and properties
- Semiconductor materials and devices
- Luminescence and Fluorescent Materials
- Molecular Junctions and Nanostructures
- Electrowetting and Microfluidic Technologies
- Microfluidic and Bio-sensing Technologies
- Electrohydrodynamics and Fluid Dynamics
- Semiconductor Quantum Structures and Devices
- Nanofabrication and Lithography Techniques
- Advanced Memory and Neural Computing
- Pickering emulsions and particle stabilization
- Advanced Battery Technologies Research
- Chalcogenide Semiconductor Thin Films
- 2D Materials and Applications
- Polymer Surface Interaction Studies
- Ga2O3 and related materials
- Anodic Oxide Films and Nanostructures
Konkuk University
2021-2024
Sejong University
2024
Konkuk University Medical Center
2022
Seoul National University
2017-2020
Korea Institute of Industrial Technology
2019-2020
Korea Advanced Institute of Science and Technology
2013-2014
Although solution processed metal nanowire (NW) percolation networks are a strong candidate to replace commercial indium tin oxide, their performance is limited in thin film device applications due reduced effective electrical areas arising from the dimple structure and percolative voids that single size NW inevitably possess. Here, we present transparent electrode based on dual-scale silver (AgNW) network embedded flexible substrate demonstrate significant enhancement area by filling large...
We demonstrate selective laser sintering of silver (Ag) nanoparticle (NP) ink using a digital micromirror device (DMD) for the facile fabrication 2D electrode pattern without any conventional lithographic means or scanning procedure. An arbitrary at lateral size 25 μm × with 160 nm height is readily produced on glass substrate by short exposure 532 Nd:YAG continuous wave laser. The resultant metal exhibits low electrical resistivity 10.8 uΩ · cm and also shows fine edge sharpness virtue...
Inkjet printing, the deposition of microfluidic droplets on a specified area, has gained increasing attention from both academia and industry for its versatility scalability mass production. printing productivity depends number nozzles used in multijet process. However, droplet jetting conditions can vary each nozzle due to multiple factors, such as surface wetting condition nozzle, properties ink, variances manufacturing head. For these reasons, must be continuously monitored evaluated by...
Inkjet printing is a powerful direct material writing process. It can be used to deposit microfluidic droplets in designated patterns at submicrometer resolution, which reduces materials usage. Nonetheless, predicting jetting characterizations not easy because of the intrinsic complexity ink–nozzle–air interactions. Thus, inkjet processes are monitored by skilled engineers ensure process reliability. This bottleneck industry, resulting high labor costs for multiple nozzles. To address this,...
Organic-inorganic hybrid perovskite materials have attracted tremendous attention as a key material in various optoelectronic devices. Distinctive properties, such tunable energy band position, long carrier diffusion lengths, and high charge mobility, allowed rapid progress perovskite-based devices (solar cells, photodetectors, light emitting diodes (LEDs), lasers). Interestingly, the developments of each field are based on different characteristics which suitable for their own applications....
Abstract The quantum dot light‐emitting diode (QLED) represents one of the strongest display technologies and has unique advantages like a shallow emission spectrum superior performance based on cumulative studies state‐of‐the‐art (QD) synthesis interfacial engineering. However, research managing device's light extraction been lacking compared to conventional LED field. Moreover, relevant top‐emitting QLEDs (TE‐QLEDs) have severely bottom‐emitting (BE‐QLEDs). This paper demonstrates novel...
Several electrode materials have been developed to provide high energy density and a long calendar life at low cost for lithium-ion batteries (LIBs). Iron (III) vanadate (FeVO4), semiconductor material that follows insertion/extraction chemistry with redox reaction provides theoretical capacity, is an auspicious choice of anode LIBs. The correlation investigated between calcination temperatures, morphology, particle size, physicochemical properties, their effect on the electrochemical...
Abstract Fabricating an electron extraction layer (EEL) with a metal doping transition oxide (TMO) in inorganic–organic hybrid perovskite solar cells (PeSCs) and organic (OSCs) is simple efficient process for enhancing photovoltaic properties. Here, the universal benefits common factors that influence both PeSCs OSCs as result of changes Al‐doped TiO 2 properties are investigated. These identified two separate mechanisms. The first involves surface smoothing films, which affects formation...
We demonstrate ZnO nanowire based UV sensor by laser‐induced hydrothermal growth of nanowire. By inducing a localized temperature rise using focused laser, array at ~ 15 μ m size consists individual nanowires with 8 length and 200 400 nm diameter is readily synthesized on gold electrode within 30 min the desired position. The process consecutively applied two different points to bridge micron gap between electrodes. resultant photoconductive NW interconnections display 2 3 orders increase in...
Abstract In this study, we introduce optimization of the annealing conditions for improvement hardness and hole transporting properties high-molecular weight poly [9, 9-dioctylfluorene-co-N-(4-(3-methylpropyl)) diphenylamine] (TFB) film used as a Hole Transport Layer (HTL) Quantum-dot Light-emitting Diodes (QLEDs). As temperatures were increased from 120 °C to 150 or more, no dissolving intermixing phenomena at interface between HTL Quantum-Dot Emission (QDs EML) was observed. However, when...
Abstract In recent past, for next‐generation device opportunities such as sub‐10 nm channel field‐effect transistors (FETs), tunneling FETs, and high‐end display backplanes, tremendous research on multilayered molybdenum disulfide (MoS 2 ) among transition metal dichalcogenides has been actively performed. However, nonavailability a matured threshold voltage control scheme, like substitutional doping in Si technology, plagued the prosperity of 2D materials electronics. Herein, an adjustment...
Optimization of ink-jet printing conditions quantum-dot (QD) ink by cosolvent process and improvement light-emitting diodes (QLEDs) characteristics assisted vacuum annealing were analyzed in this research. A hexane ortho-dichlorobenzene (oDCB) was optimized at the ratio 1:2, ink-jetting properties using Ohnesorge number based on parameters viscosity surface tension. However, we found that these cosolvents systems cause an increase boiling point a decrease vapor pressure, which influence QD...
Abstract In this work, operationally and mechanically stable organic field‐effect transistors (OFETs) are demonstrated on aramid fiber‐based paper enabled by a simple universal surface planarization method. By employing nanoimprint lithography‐inspired smoothening method, rough is successfully smoothened from scale of several tens micrometers to sub‐nanometer‐scale roughness. Owing the roughness paper, OFETs fabricated exhibit decent mobility (0.25 cm 2 V −1 s ) with high current on‐to‐off...
In this study, we introduce a flexible metal grid transparent electrode fabricated using lift-off process. This consisting of thin film with punched-like pattern by hole array was 8 um separations. The separation inkjet-printed etching resistant ink droplets controlled in order to investigate the relationship between its electrical and optical properties electrodes. aluminum areal density defined predict different arrays. A high uniform transmittance spectrum appears extend broadly into UV...
We reported Randomly Disassembled Nanostructures (RaDiNa) for light extraction in flexible OLEDs. The RaDiNa enhanced extraction, particularly at angles above the critical angle, leading to an increased external quantum efficiency (EQE).
We fabricated an organic thin film of poly(9-vinylcarbazole) : tris[2-(p-tolyl)pyridine]iridium(III) as emissive layer in light emitting diode (OLED) using the high speed nozzle jet printing method. By printing, a with width 1.5 cm and thickness 95 nm was one scan single head 1000 mm s−1. Characteristics were studied through stylus profilometry atomic force microscopy it is found that has good uniformity over entire deposited area comparable to by conventional spin coating Finally, bendable...
We demonstrate the improvement in efficiency of planar heterojunction perovskite solar cells by employing cadmium selenide tetrapods (CdSe TPs) as an electron extraction layer. The insertion CdSe TP layer between titanium oxide (TiO2) and film facilitates transfer at TiO2/perovskite interface, indicated significantly quenched steady-state photoluminescence film. Furthermore, we observed a conductivity enhancement introducing combination both effects induced TPs leads to carrier well...