A5085503460- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Advanced Semiconductor Detectors and Materials
- Radiation Detection and Scintillator Technologies
- Luminescence Properties of Advanced Materials
- Semiconductor materials and interfaces
- Iron oxide chemistry and applications
- Nanoparticle-Based Drug Delivery
- Silicon and Solar Cell Technologies
- Magnetic Properties and Synthesis of Ferrites
- Diamond and Carbon-based Materials Research
- nanoparticles nucleation surface interactions
- solar cell performance optimization
- Advanced Radiotherapy Techniques
- Gas Sensing Nanomaterials and Sensors
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Inorganic Fluorides and Related Compounds
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Photovoltaic Systems and Sustainability
- Radiation Effects in Electronics
- MRI in cancer diagnosis
- Copper-based nanomaterials and applications
- Graphene research and applications
Kyungpook National University
2010-2022
Korea Atomic Energy Research Institute
2013-2020
Gwangju Institute of Science and Technology
2012-2013
Relaxivity tuning of nanomaterials with the intrinsic T1- T2 dual-contrast ability has great potential for MRI applications. Until now, relaxivity T1 and dual-modal nanoprobes been accomplished through dopant, size, morphology nanoprobes, leaving room bioapplications. However, a surface engineering method was seldom reported. Here, we report novel based on dual-mode (DMNPs), along protein interaction monitoring DMNPs as biosensor application. Core nanoparticles (NPs) europium-doped iron...
External-biased potential distributions of a polymer bulk-heterojunction (BHJ) solar cell, incorporated with electron/hole transporting layers, were directly obseved through cross-sectional Kelvin probe force microscopy. The bulk electric field BHJ was found to be nearly field-free even under reverse biases, and the region probed expand incorporation TiOx electron layer; as result, inducing decrease quasi-Fermi level splitting in obtaining high fill factor TiOx-interlayered junction photodiodes.
The plasma reduction process for the production of reduced graphene oxide (rGO) requires precise control in order to avoid degradation electrical characteristics. We report that status oxides could be determined by monitoring optical emission intensity at 844.6 nm. Properties rGO samples processed with various exposure times were characterized X-ray photoelectron spectroscopy, Raman atomic force microscopy, and 4-point probe measurements. Optimum performance surface morphology obtained from...
To improve its light conversion efficiency, NaYF 4 :(Yb 3+ , Er ) upconversion (UC) phosphor, which generates one visible photon by absorbing two or more near‐infrared photons, was coated with SiO 2 nanoparticles. The surface modification of phosphor performed using a modified sol–gel method as function the concentration colloidal silica employed coating precursor. It found that PL intensities depend on silica. When 2.7 wt% used, exhibited homogeneous and an approximately 9% increase in...
Epitaxially grown CdS thin films on ITO substrates are prepared by using the chemical bath deposition method. As-deposited annealed in Ar at 450°C for 6 h and 24 effect of annealing structural morphological properties studied. From psi rocking curves high resolution x-ray diffractometer, one can find that after annealing, metastable nanocrystallite cubic phase transforms into stable crystalline hexagonal phase, which its behavior depends exposure time to heat. Experimental data revealed...
CdS thin films were grown by a chemical bath deposition method. The physical properties of the investigated depending on various processing conditions. A surface morphological study was done atomic force microscope(AFM) and structural property scanning electron microscope(SEM) transmission microscope(TEM) alternating temperature. Optical transmittance measurement obtained UV-Vis-NIR spectrometer. From experimental results, it confirmed that kinetics film growth associated with heterogeneous...
Solar cell modules mainly consist of EVA film and a metal grid. The is used as waterproof UV-resistant, which makes it an ideal adhesive for solar installed outdoors. As well, standard crystalline cells are generally fabricated with the front grid pattern silver paste contact. Metal cannot help accompanying shading losses caused by presence on top surface cell, prevent light from entering cell. determined transparency surface, which, planar defined fraction covered metal. In order to...
In order to investigate the effect of CdCl <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> heat treatment on physical properties CdTe thin films grown by a sputtering method, were coated with . The recrystallisation, grain growth and randomization investigated monitoring phase transition treated specimens during temperature ramp annealed using in situ high-temperature X-ray diffraction. result shows that recrystallisation CdTe(111)...
To improve the light conversion efficiency of upconversion phosphor NaYF₄:Yb3+, Tm3+ for use in solar cells, its surface was treated by removing NaF phase from NaYF₄ host crystals. The a simple procedure consisting washing, filtering, and drying. It is confirmed that compound efficiently eliminated NaYF₄-based phosphors this treatment. experimental results strongly suggest removal reduces defects enhances photoluminescence characteristics phosphors.