A5059209036- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Thin-Film Transistor Technologies
- Luminescence and Fluorescent Materials
- Advanced Sensor and Energy Harvesting Materials
- Perovskite Materials and Applications
- Semiconductor materials and devices
- Quantum Dots Synthesis And Properties
- ZnO doping and properties
- Nanowire Synthesis and Applications
- Silicon and Solar Cell Technologies
- solar cell performance optimization
- Chalcogenide Semiconductor Thin Films
- Graphene research and applications
- Supercapacitor Materials and Fabrication
- Molecular Junctions and Nanostructures
- Advanced Memory and Neural Computing
- Gas Sensing Nanomaterials and Sensors
- Advanced battery technologies research
- Nanomaterials and Printing Technologies
- Electrocatalysts for Energy Conversion
- Green IT and Sustainability
- Quantum and electron transport phenomena
- Technostress in Professional Settings
Dongguk University
2023-2025
Sejong University
2016-2022
Korea University
2016-2022
Korea Institute of Materials Science
2012-2020
Gongju National University of Education
2020
Kongju National University
2020
Korea Basic Science Institute
2020
University of Akron
2020
Convergence
2019
Sejong Institute
2019
Mechanically exfoliated graphene mounted on a SiO2/Si substrate was subjected to HF/H(2)O etching or irradiation by energetic protons. In both cases gas released from the SiO2 and accumulated at graphene/SiO2 interface resulting in formation of "bubbles" sheet. Formation these demonstrates robust nature single layer membranes, which are capable containing mesoscopic volumes gas. addition, effective mass transport has been observed.
Stretchable organic light-emitting diodes are ubiquitous in the rapidly developing wearable display technology. However, low efficiency and poor mechanical stability inhibit their commercial applications owing to restrictions generated by strain. Here, we demonstrate exceptional performance of a transparent (molybdenum-trioxide/gold/molybdenum-trioxide) electrode for buckled, twistable, geometrically stretchable under 2-dimensional random area strain with invariant color coordinates. The...
Abstract Intrinsically stretchable organic light‐emitting diodes (ISOLEDs) are becoming essential components of wearable electronics. However, the efficiencies ISOLEDs have been highly inferior compared with their rigid counterparts, which is due to lack ideal electrode materials that can overcome poor charge injection at 1D metallic nanowire/organic interfaces. Herein, efficient use graphene‐based 2D‐contact electrodes (TCSEs) incorporate a graphene layer on top embedded nanowires...
We describe experimental and theoretical studies of the buckling mechanics in silicon nanowires (SiNWs) on elastomeric substrates. The system involves randomly oriented SiNWs grown using established procedures wafers, then transferred organized into aligned arrays prestrained slabs poly(dimethylsiloxane) (PDMS). Releasing prestrain leads to nonlinear mechanical processes that transform initially linear sinusoidal (i.e., "wavy") shapes. displacements associated with these waves lie plane...
The authors have developed a semitransparent, multilayered cathode of indium tin oxide (ITO)/Ag/tungsten (WO3) for transparent organic light-emitting diodes. device showed weak negative differential resistance (NDR), until the operating voltage 8V was reached. NDR due to resonant tunneling by both quantum barrier and well. silver (Ag2O) on Ag metal confirmed x-ray photoelectron spectroscopy, energy levels Ag2O were quantized size effect this produced channels. using ITO∕Ag∕WO3 with LiF∕Al...
Thin-film transistors (TFTs) were fabricated using an indium oxide (In <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) thin film as the n-channel active layer by RF sputtering at room temperature. The TFTs showed a thickness-dependent performance in range of 48-8 nm, which is ascribed to total carrier number layer. Optimum device 8-nm-thick In had field-effect mobility 15.3 cm <sup...
Hybrid tandem solar cells comprising an inorganic bottom cell and organic top have been designed fabricated. The interlayer combination thickness matching were optimized in order to increase the overall photovoltaic conversion efficiency. A maximum power efficiency of 5.72% was achieved along with a Voc 1.42 V, reaching as high 92% sum subcell values. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or...
Recombination zone (RZ) confinement and charge balance are the most important factors for realizing enhanced efficiency in phosphorescent organic light emitting devices (Ph-OLEDs). Here, we demonstrated RZ movement improved Ph-OLED by varying electron transport layer 2,2',2''-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) thickness. The thickness increment of TPBi not only control on to emission but also shifting towards cathode. with different thick is extracted from exciplex...
Organic solar cells with inverted structures can greatly improve photovoltaic stability. This paper reports a method to lower the work function of indium tin oxide (ITO) in organic by modification ultrathin 3-aminopropyltriethoxysilane (APTES) monolayers. The device studies showed that resulting efficiencies were significantly increased from 0.64% 4.83% use APTES monolayer, which could be attributed dramatic enhancement open-circuit voltage and fill factor. effective electron selectivity...
We report the confinement of recombination zone (RZ) in green phosphorescent organic light-emitting diodes (Ph-OLEDs) for enhanced efficiency by varying emission layer (EML) thickness and through quantum well (QW) insertion. At low EML, is reduced owing to diffusion RZ toward EML/hole transport interface, which was revealed presence exciton blocking [TCTA: tris(4-carbazoyl-9-ylphenyl)amine] excitation accompanied a blue-shift electroluminescence (EL). Further increase EML caused move...
Abstract This study investigated white organic light‐emitting diodes (OLEDs) with a single emissive layer and comprising hole transport material 1,1‐Bis[(di‐4‐tolylamino)phenyl]cyclohexane (TAPC) two electron materials 1,3,5‐Tris(1‐phenyl‐1H‐benzimidazol‐2‐yl)benzene (TPBi) 1,3,5‐tris(3‐pyridyl‐3‐phenyl)benzene (TmPyPB). The devices exhibited unique emission characteristics, from sky blue orange exciplex emissions at low voltages to yellow electromer higher voltages. combination of these...
The effects of epitaxial materials and solar cell design on the performance cells grown by multilayer approach are investigated. novel structure with a p-on-n type configuration suggested exhibits improved uniformity in photovoltaic because suppression Zn diffusion. This provides routes to achieve further improvements acts as guideline for commercialization technique.
<h2>Summary</h2> Investigating exciton dynamics and device physics in phosphorescent organic light-emitting diodes (Ph-OLEDs) is important for developing highly efficient devices with optimal color purity. Herein, we conduct an in-depth exploration of the recombination zone various radiative transitions within blue Ph-OLEDs using operando electrically pumped spectroscopy. It serves as a versatile tool enabling simultaneous analysis time-resolved electroluminescence photoluminescence. Our...
Low-temperature annealing of Zinc oxide (ZnO) films as electron transport layers for inverted polymer solar cells was investigated. A wrinkled morphology the ZnO film has previously been mostly observed after dynamic (DA). In this study, we investigated effect static (SA) deposited by sol–gel method at 25 °C, 150 and 200 °C 10 min in air. We formation wrinkle structures on surface sample annealed while flat were formed °C. Here, a variable ramping/heating rate provided process resulted...
The effect of varying degrees surface and vertical coverage gold nanoparticles (Au-NPs) by poly(styrenesulfonate)-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS), which was used as a capping layer between indium tin oxide (ITO) hole transport (HTL) on small-molecule fluorescent organic light-emitting diodes (OLEDs), systemically investigated. With respect to the Au-NP loading amount size, resultant current densities influenced charge balance and, therefore, OLED device performance. When...
Dye-sensitized solar cells (DSSCs) have attracted intense scientific interest due to their low cost, environmentally friendly operation, and relatively high efficiency. In particular, solid-state fiber dye-sensitized (SS-FDSSCs) significant attention for potential applications in portable, flexible, wearable electronics. However, the use of general DSSCs these is limited by highly leak-susceptible volatile liquid electrolytes. Therefore, development a efficient stable electrolyte SS-FDSSCs...
We studied the effect of direct charge trapping at different doping concentrations on device performance in tris(8-hydroxyquinoline) aluminum (Alq3):10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-(1)-benzopyropyrano(6,7-8-i,j)quinolizin-11-one (C545T) as a host-dopant system fluorescent organic light-emitting diode. With increasing C545T concentration, trap sites could lead to promotion hole injection and suppression electron due electron-transport character Alq3 host...
This study presents a preliminary investigation of the application MAPbI3 perovskite solar cells (PSCs) as dosimeters for space and medical purposes. Specifically, it explores effects 6 MeV electron beam exposure on performance degradation mechanisms PSC devices. The also employs crystallographic, optical, simulation-based analyzes to gain insights into process. findings this research lay groundwork development an advanced radiation detection structure, combining scintillator with...
A new strategy for control of the in-plane orientation pentacene is introduced using nanometer-scale periodic groove patterns as an alignment layer. Compared to films that are not aligned, enhanced field effect mobility 1.67 cm2 V−1 s−1 has been achieved when optimal π-orbital overlap direction parallel current flow. Supporting information this article available on WWW under http://www.wiley-vch.de/contents/jc_2089/2008/adma200701076_s.pdf or from author. Please note: The publisher...