A5086773482- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Advanced Sensor and Energy Harvesting Materials
- Thin-Film Transistor Technologies
- Analytical Chemistry and Sensors
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Molecular Junctions and Nanostructures
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Gas Sensing Nanomaterials and Sensors
- Advanced Chemical Sensor Technologies
- Ionic liquids properties and applications
- Advanced Memory and Neural Computing
- Advanced Thermoelectric Materials and Devices
- Machine Learning in Materials Science
- Thermal properties of materials
- Nanomaterials and Printing Technologies
- GaN-based semiconductor devices and materials
- Nanomaterials for catalytic reactions
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Advanced Photocatalysis Techniques
Korea Research Institute of Chemical Technology
2021-2025
Gwangju Institute of Science and Technology
2015-2022
Gwangju University
2016-2020
Government of the Republic of Korea
2016-2020
Photonics (United States)
2017
Despite the recent unprecedented increase in power conversion efficiencies (PCEs) of small-area devices (≤0.1 cm2 ), PCEs deteriorate drastically for PSCs larger areas because incomplete film coverage caused by dewetting hydrophilic perovskite precursor solutions on hydrophobic organic charge-transport layers (CTLs). Here, an innovative method fabricating scalable all types CTLs is reported. By introducing amphiphilic conjugated polyelectrolyte as interfacial compatibilizer, uniform films...
Ionic defects (e.g., organic cations and halide anions), preferably residing along grain boundaries (GBs) on perovskite film surfaces, are known to be a major source of the notorious environmental instability solar cells (PeSCs). Although passivating ionic is desirable, previous approaches using Lewis base or acid molecules as additives suppress only negatively positively charged defects, thus leaving oppositely defects. In this work, both cationic anionic inside methyl ammonium lead...
Abstract Dark current density ( J dark ) is the most important factors determining signal‐to‐noise ratio, linear dynamic range and detectivity D * of organic photodetectors (OPDs). However, solution‐processed OPDs generally suffer from high under bias because origin still remains unclear related to complicate factors. In this work, effect fluorinated alkyl side chain (FAC) conjugated polymers (CPs) on OPD performance systematically investigated according number fluorine atom. The OPDs,...
Significance When various electronic appliances used in everyday life become deformable and transparent, they will provide tremendous versatility the design use of see-through, smart mobile applications, exceeding limitations best developed conventional silicon technologies, which are available only rigid, opaque forms. However, even recently discovered innovative semiconducting components have failed to simultaneously achieve such flexibility transparency. Thus, existing options still...
Despite the high expectation of deformable and see-through displays for future ubiquitous society, current light-emitting diodes (LEDs) fail to meet desired mechanical optical properties, mainly because fragile transparent conducting oxides opaque metal electrodes. Here, by introducing a highly conductive nanofibrillated polymer (CP) as both anode cathode, ultraflexible LEDs (PLEDs) are demonstrated. The CP-based PLEDs exhibit outstanding dual-side light-outcoupling performance with...
Nucleation and growth processes can be effectively controlled in organic semiconductor films through a new concept of template-mediated molecular crystal seeds during the phase transition; effective control these ensures millimeter-scale domains, as well performance resulting with intrinsic hole mobility 18 cm(2) V(-1) s(-1).
Abstract The origin of performance enhancements in p‐i‐n perovskite solar cells (PSCs) when incorporating low concentrations the bulky cation 1‐naphthylmethylamine (NMA) are discussed. A 0.25 vol % addition NMA increases open circuit voltage ( V oc ) methylammonium lead iodide (MAPbI 3 PSCs from 1.06 to 1.16 and their power conversion efficiency (PCE) 18.7% 20.1%. X‐ray photoelectron spectroscopy energy ion scattering data show is located at grain surfaces, not bulk. Scanning electron...
Abstract Near‐infrared organic photodetectors (NIR OPDs) comprising ultra‐narrow bandgap non‐fullerene acceptors (NFA, over 1000 nm) typically exhibit high dark current density under applied reverse bias. Therefore, suppression of is crucial to achieve high‐performance such NIR OPDs. Herein, cyano (CN) with a strong electron‐withdrawing property introduced into alkoxy thiophene as π‐bridge adjust its optoelectronic characteristics, and the correlation between charge injection barrier...
Abstract Ultra-flexible organic photovoltaics (OPVs) are promising candidates for next-generation power sources owing to their low weight, transparency, and flexibility. However, obtaining ultra-flexibility under extreme repetitive mechanical stress while maintaining optical transparency remains challenging because of the intrinsic brittleness transparent electrodes. Here, we introduce strain-durable ultra-flexible semitransparent OPVs with a thickness below 2 μm. The conformal surface...
Self-charging power packs (SPPs), integrating both a solar cell and energy storage capacitor (EC) into single device, are very promising systems due to their multiple functions of harvesting storage.
Realizing industrial-scale, large-area photovoltaic modules without any considerable performance losses compared with the of laboratory-scale, small-area perovskite solar cells (PSCs) has been a challenge for practical applications PSCs. Highly sophisticated patterning processes achieving series connections, typically fabricated using printing or laser-scribing techniques, cause unexpected efficiency drops and require complicated manufacturing processes. We successfully high-efficiency, PSC...
A long-term operational stability over 1000 hours in the inverted type perovskite solar cells based on MAPbI<sub>3</sub> layer is demonstrated under ionic defect-free conditions.
Abstract Reported here is a new high electron affinity acceptor end group for organic semiconductors, 2,1,3‐benzothiadiazole‐4,5,6‐tricarbonitrile (TCNBT). An n‐type semiconductor with an indacenodithiophene (IDT) core and TCNBT groups was synthesized by sixfold nucleophilic substitution cyanide on fluorinated precursor, itself prepared direct arylation approach. This one‐step chemical modification significantly impacted the molecular properties: TFBT IDT, poor ambipolar semiconductor,...
In this work, a novel single-atom alloy electrocatalyst (SAAE) was developed for enhanced electrocatalysis in next-generation energy technologies. The catalyst, composed of Rh and bulk Ni on FeV3O8 support, overcomes challenges related to stability efficiency electrochemical reactions. work function difference between Ni, as confirmed by computational synchrotron-based analysis, facilitates superior electric polarization ohmic contact with FeV3O8. FeV3O8@RhNi demonstrates outstanding...
The advent of special types transparent electrodes, known as “ultrathin metal electrodes,” opens a new avenue for flexible and printable electronics based on their excellent optical transparency in the visible range while maintaining intrinsic high electrical conductivity mechanical flexibility. In this electrode architecture, introducing nucleation inducers (MNIs) plastic substrates is key concept to form high‐quality ultrathin films (thickness ≈ 10 nm) with smooth continuous morphology....
Despite recent breakthroughs in the fabrication of spin-coated small-area devices (≤0.1 cm2) with power conversion efficiencies (PCEs) more than 17%, printed large-area organic solar cells (OSCs) are significantly less efficient because intrinsic differences between coating dynamics two types OSCs. The PCEs (∼100 OSCs have typically been decreased compared those devices. In this work, an low-temperature printing method to fabricate high-efficiency nonfullerene-based OSC modules is...
Electric-field driven chemical doping modulation in a solution-processed organic semiconductor and solid-state ionic liquid blend response to volatile compounds provides an exciting opportunity facilitate low-power gas sensors.
Abstract Organic photodetectors (OPDs) based on non‐fullerene acceptors (NFAs) have received considerable attention because of their potential for use in various commercial applications as near‐infrared (NIR) light sensing platforms. However, recent OPDs suffer from low NIR photoresponse and large dark/noise currents with narrow bandgap organic photoactive materials. Herein, a π ‐bridge molecular engineering strategy replacing alkoxythienyl benzothiadiazole ultra‐narrow (ultra‐NBG) NFAs is...
Ultra-flexible organic photovoltaic (OPV) devices are gaining recognition due to their lightweight, mechanical flexibility, and high productivity potential emerging as a notable alternative power source. Significant enhancements in material design device architecture have facilitated near 20% of conversion efficiencies (PCEs). To elevate PCE further, the integration soft optical elements is pivotal, enabling optimized photon utilization by minimizing reflection augmenting path through...
The development of portable X‐ray detectors is necessary for diagnosing fractures in unconscious patients emergency situations. However, this quite challenging because the heavy weight scintillator and silicon photodetectors. thickness can be reduced by replacing layer with an organic This study presents a novel bithienopyrroledione‐based polymer donor that exhibits excellent photodetection properties even thick photoactive (~700 nm), owing to symmetric backbone highly soluble molecular...
The effect of hydrogen bonding and π–π intermolecular stacking on the physical properties device performance.
Abstract The collection efficiency of photogenerated charges in polymer solar cells (PSCs) is strongly influenced by the built‐in field ( E ) that develops across photoactive materials. Here, investigating ‐development regimes PSCs introducing two types interlayers, electric dipole layers (EDLs) and charge transport (CTLs), device architecture optimized to result a larger . By incorporating pair EDLs on both sides layer, modulated shifting vacuum energy at each metal–semiconductor interface,...