A5072888672- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Luminescence and Fluorescent Materials
- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Analytical Chemistry and Sensors
- Semiconductor materials and devices
- Advancements in Battery Materials
- Gas Sensing Nanomaterials and Sensors
- Nanowire Synthesis and Applications
- Advanced Chemical Sensor Technologies
- Advanced Thermoelectric Materials and Devices
- Polydiacetylene-based materials and applications
- Advanced Battery Materials and Technologies
- Advanced Memory and Neural Computing
- Advanced battery technologies research
- Chalcogenide Semiconductor Thin Films
- Diverse Approaches in Healthcare and Education Studies
- Metal and Thin Film Mechanics
- Advanced Sensor and Energy Harvesting Materials
- Nanomaterials and Printing Technologies
- Molecular Sensors and Ion Detection
Konkuk University
2015-2024
Government of the Republic of Korea
2015-2020
Konkuk University Medical Center
2015-2020
University of Michigan
2009-2016
Convergence
2014
Institute of Macromolecular Chemistry
2014
Ann Arbor Center for Independent Living
2014
Sungkyunkwan University
2012
Samsung (South Korea)
2002
American Standard (United States)
1990
Abstract In this work, we report on solution-based p-i-n-type planar-structured CH 3 NH PbI perovskite photovoltaic (PV) cells, in which precrystallized NiO nanoparticles (NPs) without post-treatment are used to form a hole transport layer (HTL). X-ray diffraction and high-resolution transmission electron microscopy showed the crystallinity of NPs, atomic force scanning confirmed uniform surfaces resultant thin film subsequent photoactive layer. Compared conventional...
Effective cell design variables having a large impact on the fill factor (FF) of organic photovoltaic cells (OPVCs) were systematically identified using general device structure ITO/PEDOT:PSS/P3HT + PCBM/LiF/Al. The results show that characteristic properties layer, such as morphology and thickness, regioregularity conjugated polymer, two interfaces between electrodes blend layer have influence FF by affecting series resistance (R(s)) shunt (R(sh)). systematic investigation described in this...
Abstract To devise a reliable strategy for achieving specific HOMO and LUMO energy level modulation via alternating donor‐acceptor monomer units, we investigate series of conjugated polymers (CPs) in which the electron withdrawing power acceptor group is varied, while maintaining same donor chain conformation. Through experiment DFT calculations, good correlation identified between strength group, levels, degree orbital localization, allows design principles CPs. Increasing results an...
Triarylamine derivatives containing electron donating methoxy units provide outstanding device performance as dopant-free hole transporting materials in inverse type planar heterojunction perovskite solar cells.
p‐Type redox‐active organic materials (ROMs) draw increasing attention as a promising alternative to conventional inorganic electrode in secondary batteries due high redox voltage, fast rate capability, environment friendliness, and abundance. First, fundamental properties of the p‐type ROMs regarding energy levels anion‐related chemistry are briefly introduced. Then, development progress is outlined this review by classifying them according their centers. The molecular design strategies...
Blood-contacting devices must be designed to minimize the risk of bloodstream-associated infections, thrombosis, and intimal lesions caused by surface friction. However, achieving effective prevention both infections thrombosis poses a challenge due conflicting nature antibacterial antithrombotic activities, specifically regarding electrostatic interactions. This study introduced novel biocompatible hydrogel sodium alginate zwitterionic carboxymethyl chitosan (ZW@CMC) with activities for use...
We have demonstrated ultrasonic-assisted nanodimensional self-assembly of a conjugated polymer, P3HT, depending on its regioregularity, solvent polarity, and light irradiation. The resulting P3HT nanowires were investigated by means AFM, UV-vis, XRD compared with films made conventional thermal annealing method. Obtained results indicate that ultrasonic agitation effectively generates nanowires, exemplifying quick route to nanoscale morphology control which contributes better organic...
Near-infrared organic photodetectors (NIR OPDs) have attracted considerable attention because of their inherent advantages such as a tailorable light absorption property, low-cost fabrication, compatibility with flexible substrates, and room-temperature operation. In particular, the development NIR detection between 900 950 nm is crucial for noise-free communication in ambient environments. this work, we demonstrate high-detectivity OPDs at 900–950 by employing non-fullerene acceptor (ITIC)...
Abstract Developing electrical organic conductors is challenging because of the difficulties involved in generating free charge carriers through chemical doping. To devise a novel doping platform, capabilities four designed conjugated polymers (CPs) are quantitatively characterized using an AC Hall‐effect device. The resulting carrier density related to degree electronic coupling between CP repeating unit and 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F4‐TCNQ), doped PIDF‐BT...
Afterglow is superior to other optical modalities for biomedical applications in that it can exclude the autofluorescence background. Nevertheless, afterglow has rarely been applied high-contrast "off-to-on" activatable sensing scheme because complicated systems hamper additional inclusion of sensory functions while preserving luminescence. Herein, a simple formulation multifunctional components-incorporated nanosensor (MANS) developed superoxide-responsive imaging cisplatin-induced kidney...
To investigate the structure-dependent aggregation behavior of conjugated polymers and effect on device performance polymer photovoltaic cells, new (PVTT CN-PVTT) having same regioregularity but different intermolecular packing were prepared characterized by means UV−vis spectroscopy atomic force microscopy (AFM). Photovoltaic devices with these under polymer-aggregate conditions. Polymer induced thermal annealing increases short circuit current provides no advantage in overall power...
Abstract Doping capability is primitively governed by the energy level offset between highest occupied molecular orbital (HOMO) of conjugated polymers (CPs) and lowest unoccupied (LUMO) dopants. A poor doping efficiency obtained when directly using NOBF 4 forming a large with CP, while devised strategy found to significantly improve (electrical conductivity) sequentially treating pre‐doped CP 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquino‐dimethane (F4TCNQ), establishing relatively small...
Intercorrelation of thermoelectric properties a doped conjugated semiconducting polymer (PIDF-BT) with charge carrier density, conductive morphology, and crystallinity are systematically investigated. Upon being F4-TCNQ by the sequential doping method, PIDF-BT exhibited high electrical conductivity over 210 S cm-1. The significant enhancement resulted from which is attributed to effective charge-transfer-based integer between dopant molecules. Based on systemic characterization optical,...
Abstract Conventional chemical doping processes for conjugated polymers (CPs) often degrade the film morphology or cause unsatisfactory efficiency owing to aggregation formation between charged species insufficient dopant diffusion. In this work, a new strategic method, “hybrid doping,” is suggested maximizing of CPs without hampering surface CP films. The advantage hybrid that it combines mixture blending and sequential soaking processes. Based on systemic characterizations including...
Organic thermoelectric (TE) attracts considerable interest as a next-generation energy conversion technology; however, its practical application is still restricted by low power factors. Herein, we report generally applicable solvent-combination doping method for improving TE properties of conjugated polymers (CPs). Residual solvents in ternary solvent enlarged the free volume CP films. This beneficial effect boosted both dopant diffusion efficiency and charge carrier density doped films,...
Abstract This paper systematically compares the gas sensing properties of organic field‐effect transistors (OFETs) based on patterned 5,11‐bis(triethylsilylethynyl)anthradithiophene (TES‐ADT) films, by adopting TES‐ADT crystal arrays various shapes and dimensions. The patterning crystallization spin‐cast layers are achieved use a solvent‐containing engraved polydimethylsiloxane (PDMS) mold. Decreasing width pattern enhances performance, as well mobility OFETs. decreased grain boundary...
Conjugated polymers (CPs) have provided versatile semiconducting implements for the development of soft electronic devices. When three CPs with same conjugated framework but different side chains were adopted in field-effect transistor (FET) sensor NO2 detection, response to showed an opposite tendency charge carrier mobility each CP. Morphological and structural characterizations revealed that flexible glycol chain enhances affinity as well prevents formation lamellar stacking CP chains,...
New light harvesting organic conjugated polymers containing 4,8-bis(2-ethylhexyloxy)benzo[1,2-b;3,4-b′]dithiophene(BDT) donor groups and thiophene with various electron-withdrawing acceptor were investigated. Also investigated was poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7), which is one of the most efficient photovoltaic polymers. In this study, steady state absorption, emission, ultrafast...
Abstract Interfacial engineering in organic–inorganic hybrid perovskite solar cells (PSCs) has attracted significant attention, aiming to achieve high‐performing and highly stable devices. Here, newly designed organic small molecules based on quinoxaline triphenylamine for inverted type wide‐bandgap PSCs are introduced, with the objective of enhancing interfacial properties between NiO x hole transport layer (HTL). The incorporation an interlayer effectively reduces energy level offset HTL...