A5055050194- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Synthesis and Characterization of Pyrroles
- TiO2 Photocatalysis and Solar Cells
- Organic Light-Emitting Diodes Research
- Synthesis and properties of polymers
- Chalcogenide Semiconductor Thin Films
- Ionic liquids properties and applications
- Catalytic Cross-Coupling Reactions
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Chemical Synthesis and Reactions
- Synthetic Organic Chemistry Methods
- Polymer Synthesis and Characterization
- Fluorine in Organic Chemistry
- Advanced Photocatalysis Techniques
- Advanced Nanomaterials in Catalysis
- Organic and Molecular Conductors Research
- Sulfur-Based Synthesis Techniques
- Synthesis of heterocyclic compounds
- Carbon Nanotubes in Composites
- Dielectric materials and actuators
- Marine Sponges and Natural Products
Gyeongsang National University
2022-2024
Ewha Womans University
2010-2023
Ewha Womans University Medical Center
2014
Government of the Republic of Korea
2014
Korea Research Institute of Chemical Technology
2013
Fluorinated amorphous polymeric gate-insulating materials for organic thin-film transistors (OTFTs) not only form hydrophobic surfaces but also significantly reduce traps at the interface between semiconductor and gate insulator. Therefore, these can enhance OTFT's operation stability. In this study, we synthesized a new insulating material series composed of acrylate fluorinated functional groups (with different ratios) named MBHCa-F used them as insulators OTFTs in other applications. The...
The development of organic photovoltaic (OPV) devices based on non-fullerene acceptors (NFAs) has led to a rapid improvement in their efficiency. Despite these improvements, significant performance degradation the early stages operation, known as burn-in, remains challenge for NFA-based OPVs. To address this challenge, study demonstrates stable OPV fabricated using sequential deposition (SqD) and quasi-orthogonal solvent. solvent, which is prepared by incorporating 1-chloronaphthalene (1-CN)...
The catalytic activity of lanthanide triflates, particularly scandium triflate, increased dramatically in [bmim][SbF6], allowing the cyanosilylation a variety aldehydes and ketones with turnover frequency up to 48 000 mol h−1 total number 100 000.
The Blaise reaction intermediate, generated in situ from Reformatsky reagent and nitrile, reacted with propiolates a chemo- regioselective manner to afford 2-pyridone derivatives good excellent yields
To commercialize organic solar cells (OSCs), changes in the optimized morphology of photoactive layer caused by external stimuli that cause degradation must be addressed. This work improves OSC stability utilizing cross-linking additive 1,8-dibromooctane (DBO) and a sequential deposition process (XSqD) to fabricate layer. The donor polymer (PTB7-Th) crystallinity immobilizes crystalline partial photo-cross-linking. Ellipsometry experiments confirm increase glass transition temperature...
Abstract We report the superior characteristics of a ZnO buffer layer covered with phenothiazine‐based, π‐conjugated donor–acceptor (D–π–A)‐type organic dye (called “d‐ZnO”). The use this system for performance enhancement inverted bulk heterojunction polymer solar cells (PSCs) configuration indium tin oxide/d‐ZnO/polymer:PC 71 BM/MoO 3 /Ag (PC BM=[6,6]‐phenyl C butyric acid methyl ester) is investigated. dyes anchored on surface through carboxylate bonding reduces shunt path bare and...
An efficient hole-transporting layer (HTL) based on functionalized two-dimensional (2D) MoS2-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composites has been developed for use in organic solar cells (OSCs). Few-layer, oleylamine-functionalized MoS2 (FMoS2) nanosheets were prepared via a simple and cost-effective solution-phase exfoliation method; then, they blended into PEDOT:PSS, conducting conjugated polymer, the resulting hybrid film (PEDOT:PSS/FMoS2) was tested as...
Commercial hydrogen (H2) sensors operate at high temperatures, which increases power consumption and poses a safety risk owing to the flammable nature of H2. Here, polymer-noble metal-metal oxide film is fabricated using spin-coating printing methods realize highly sensitive, low-voltage operation, wide-operating-concentration, near-monoselective H2 sensor room temperature. The with an optimized thickness Pd nanoparticles SnO2 showed extremely response 16,623 time 6 s recovery 5 temperature...
A morphologically-stable polymer/fullerene heterojunction has been prepared by minimizing the intermixing between polymer and fullerene via sequential deposition (SqD) of a solution. low crystalline conjugated PCPDTBT (poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta [2,1-b;3,4-b']dithiophene)-alt-4,7(2,1,3-benzothiadiazole)]) utilized for layer PC71BM (phenyl-C71-butyric-acid-methyl ester) layer, respectively. Firstly, nanostructured bottom was developed utilizing various additives to...
Binary organic photovoltaics (OPVs) fabricated by single-step (SS) deposition of a binary blend polymer (or small molecule) donor and fullerene acceptor (SS OPV) are widely utilized. To improve the OPV performance, SS ternary OPVs utilizing consisting two one) electron donor(s) one two) acceptor(s) have been studied. require more sensitive complex optimization processes to optimize bulk heterojunctions with bicontinuous nanoscale phase separation acceptor. We demonstrated novel sequential...
Solution-based printing has contributed to the facile deposition of various types materials, including building blocks printed electronics. In particular, solution-processable organic semiconductors (OSCs) are regarded as one most fascinating candidates for fabrication Herein, we report electrohydrodynamic (EHD) jet-printed p- and n-type OSCs, namely 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS–PEN) 6,13-bis((triisopropylsilyl)ethynyl)-5,7,12,14-tetraazapentacene (TIPS–TAP), their use...
The present study investigates the influence of photosensitizer selection and polymer electrolyte composition on performance quasi-solid-state dye-sensitized solar cells (QsDSSCs). Two benchmark ruthenium dyes, N719 Z907, alongside a novel photoactive phenothiazine dye were used. Each was incorporated into QsDSSC architecture employing poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as gel matrix, with varying molecular weights, to investigate their impacts overall device...
The performance of organic photovoltaics (OPVs) based on the small-molecule semiconductor p-DTS(FBTTh2 )2 is greatly improved by addition a conjugated block copolymer composed difluoroquinoxaline and thienopyrrolodione blocks (D130). power conversion efficiency (PCE) -based OPV from 5.08% to 6.75% 5 wt% D130 photoactive layer, which fullerene derivative. Current-voltage grazing incidence wide-angle X-ray scattering analyses revealed that significantly reduces trap density device changes...
In contrast to the reaction of benzoquinones with β-enaminoesters providing indoles (Nenitzescu reaction), tandem one-pot Blaise intermediate, zinc bromide complex β-enaminoesters, benzoquinone affords 5-hydroxy-α-(aminomethylene)benzofuran-2(3H)-ones in good excellent yields (tandem Blaise-Nenitzescu reaction).
We introduce a facile approach to use ruthenium dioxide (RuO2) and (Ru) nanostructures as effective counter electrodes instead of using platinum (Pt) for dye-sensitized solar cells (DSSCs). RuO2 Ru nanostructure layers on the FTO glass can be readily prepared by simple annealing process followed spin coating mixture solution containing amorphous RuO2·xH2O precursor poly(ethylene oxide) (PEO) dispersion matrix at low temperature in air. The metal layer reduction with H2 shows highest...
Charge extraction at carrier transport layers adjacent to perovskites is crucial for the optimization of perovskite solar cells. In particular, Sn-perovskites with no lead elements are known struggle from charge extraction. Here, we report effects organic ligands such as FA and MA (FA = HC(NH2)2+; CH3NH3+) on separation interface between electron perovskites. TiO2 mesoporous covering tin-perovskites show significant changes in electronic structure built-in potentials according ratio MA....
High- k polymeric layers with UV-assisted organic azide fluorine-based crosslinkers lead to dramatic improvements in the electrical performance of OFETs and integrated devices.
Insulating polymeric layers, like fluorinated polymers, are excellent dielectric materials for organic field-effect transistors (OFETs).
Abstract For organic photovoltaics (OPVs), the electron transport layer (ETL) material is crucial for collecting and transporting electrons from active toward electrode. In this study, TiO 2 nanoparticles (TNPs) are functionalized with a series of catechol (CA) derivatives possessing different electrophilicities, i.e., CA; CA attached to an electron‐withdrawing cyano group, 3,4‐Dihydroxy benzonitrile (CA‐CN); electron‐donating methoxy 4‐Methoxybenzene‐1,2‐diol (CA‐OMe), resulting...
Photostability of small-molecule (SM)-based organic photovoltaics (SM-OPVs) is greatly improved by utilizing a ternary photo-active layer incorporating small amount conjugated polymer (CP). Semi-crystalline poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2FBT) and amorphous poly[(2,5-bis(2-decyltetradecyloxy)phenylene)-alt-(5,6-dicyano-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2CNBT) with similar chemical...
Non‐fullerene acceptor (NFA)‐based organic solar cells often exhibit significant cell degradation in power conversion efficiency (PCE) the early stages of operation, called “burn‐in.” Generally, to fabricate NFA‐based cells, binary blend solution deposition (binary BSD) a conjugated polymer and an NFA is utilized. Herein, reasons for burn‐in are investigated by aging photovoltaic with independent control temperature light. The results reveal that mainly due rapid increase interfacial...