A5078196728- Perovskite Materials and Applications
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Chalcogenide Semiconductor Thin Films
- CO2 Reduction Techniques and Catalysts
- Advanced Sensor and Energy Harvesting Materials
- ZnO doping and properties
- Ionic liquids properties and applications
- Semiconductor Lasers and Optical Devices
- Carbon dioxide utilization in catalysis
- Engineering Applied Research
- Synthesis and properties of polymers
- Molecular Junctions and Nanostructures
- GaN-based semiconductor devices and materials
- Surface Modification and Superhydrophobicity
- Nonlinear Optical Materials Studies
- Polymer Nanocomposites and Properties
- Ga2O3 and related materials
- Semiconductor Quantum Structures and Devices
- Nanomaterials and Printing Technologies
- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- Advanced Materials and Mechanics
University of Toronto
2021-2025
Ulsan National Institute of Science and Technology
2014-2024
Sungkyunkwan University
2024
National Yang Ming Chiao Tung University
2022
Samsung (South Korea)
2021
Pukyong National University
2021
Government of the Republic of Korea
2016-2020
Kongju National University
2014
The use of hybrid organic-inorganic perovskites in optoelectronic applications are attracting an interest because their outstanding characteristics, which enable a remarkable enhancement device efficiency. However, solution-processed perovskite crystals unavoidably contain defect sites that cause hysteresis solar cells (PeSCs) and blinking light-emitting diodes (PeLEDs). Here, we report significant beneficial effects using new treatment based on amine-based passivating materials (APMs) to...
Highly efficient planar perovskite optoelectronic devices are realized by amine-based solvent treatment on compact TiO2 and optimizing the morphology of layers. Amine-based between layers enhances electron injection extraction reduces recombination photogenerated charges at interface.
Solution-processable perovskite materials have garnered tremendous attention because of their excellent charge carrier mobility, possibility a tunable optical bandgap, and high photoluminescence quantum efficiency (PLQE). In particular, the uniform morphology film is most important factor in realizing light-emitting diodes (PeLEDs) with full-coverage electroluminescence (EL). this study, we demonstrate highly efficient PeLEDs that contain by introducing HBr into precursor. The introduction...
Abstract The beneficial use of a hole transport layer (HTL) as substitution for poly(3,4-ethlyenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) is regarded one the most important approaches improving stability and efficiency inverted perovskite solar cells. Here, we demonstrate highly efficient stable cells by applying GO-doped PEDOT:PSS (PEDOT:GO) film an HTL. high performance this cell stems from excellent optical electrical properties PEDOT:GO film, including higher conductivity, work...
Alkali hydroxide systems capture CO2 as carbonate; however, generating a pure stream requires significant energy input, typically from thermal cycling to 900°C. What is more, the subsequent valorization of gas-phase into products presents additional requirements and system complexities, including managing formation (bi)carbonate in an electrolyte separating unreacted downstream. Here, we report direct electrochemical conversion CO2, captured form carbonate, multicarbon (C2+) products. Using...
The interfacial dipolar polarization in inverted structure polymer solar cells, which arises spontaneously from the absorption of ethanolamine end groups, such as amine and hydroxyl groups on ripple-structure zinc oxide (ZnO-R), lowers contact barrier for electron transport extraction leads to enhanced mobility, suppression bimolecular recombination, reduction resistance series resistance, remarkable enhancement power conversion efficiency. As a service our authors readers, this journal...
The addition of chemical additives is considered as a promising approach for obtaining high-quality perovskite films under mild conditions, which essential both the efficiency and stability organic-inorganic hybrid solar cells (PeSCs). Although such additive engineering yields films, inherent insulating property prevents efficient transport extraction charge carriers, thereby limiting applicability this approach. Here, it shown that organic conjugated molecules having rhodanine moieties...
Organic-inorganic hybrid perovskites are emerging as promising emitting materials due to their narrow full-width at half-maximum emissions, color tunability, and high photoluminescence quantum yields (PLQYs). However, the thermal generation of free charges room temperature results in a low radiative recombination rate an excitation-intensity-dependent PLQY, which is associated with trap density. Here, we report perovskite films composed uniform nanosized single crystals (average diameter =...
A perovskite LED with a film treated under optimum thermal annealing conditions exhibits significantly enhanced long-term stability full coverage of the green electroluminescence emission due to highly uniform morphology film. As service our authors and readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical support issues arising from (other than missing...
Abstract Semiconducting lead halide perovskite nanocrystals (PNCs) are regarded as promising candidates for next‐generation optoelectronic devices due to their solution processability and outstanding properties. While the field of light‐emitting diodes (LEDs) photovoltaics (PVs), two prime examples devices, has recently seen a multitude efforts toward high‐performance PNC‐based realizing both with high efficiencies stabilities through single PNC processing strategy remained challenge. In...
Abstract Quantum dot (QD) light‐emitting diodes (QLEDs) are promising for next‐generation displays, but suffer from carrier imbalance arising lower hole injection compared to electron injection. A defect engineering strategy is reported tackle transport limitations in nickel oxide‐based inorganic hole‐injection layers (HILs) and find that able enhance high‐performance InP QLEDs using the newly designed material. Through optoelectronic simulations, how electronic properties of NiO x affect...
The change in the work function (WF) of ZnO with amine-based interfacial mole-cules (AIM) can be controlled by number amine groups. AIM a larger group induce stronger interface dipole between groups and surface, leading to greater reduction WF.
We report highly efficient perovskite LEDs with a reduced hole injection barrier and improved crystallinity of using PEDOT:MoO<sub>3</sub> composite layer.
Perovskite-based optoelectronic devices have been rapidly developing in the past 5 years. Since first report, external quantum efficiency (EQE) of perovskite light-emitting diodes (PeLEDs) has increased through control morphology and structure from 0.1% to more than 11%. Here, we report use various conjugated polyelectrolytes (CPEs) as hole injection layer PeLEDs. In particular, find that poly[2,6-(4,4-bis-potassium butanylsulfonate)-4 H-cyclopenta-[2,1- b;3,4- b']-dithiophene)] (PCPDT-K)...
A series of anionic conjugated polyelectrolytes (CPEs) is synthesized based on poly(fluorene-co-phenylene) by varying the side-chain ionic density from two to six per repeat units (MPS2-TMA, MPS4-TMA, and MPS6-TMA). The effect MPS2, 4, 6-TMA as interlayers top a hole-extraction layer poly(bis(4-phenyl)-2,4,6-trimethylphenylamine (PTAA) investigated in inverted perovskite solar cells (PeSCs). Owing improved wettability perovskites hydrophobic PTAA with CPEs, PeSCs CPE demonstrate...
Solution-processed colloidal quantum dots (CQDs) are promising materials for photodetectors operating in the short-wavelength infrared region (SWIR). Devices typically rely on CQD-based hole transport layers (HTL), such as CQDs treated using 1,2-ethanedithiol. Herein, we find that these HTL exhibit low carrier mobility, limiting photodiode response speed. We develop instead inverted (p-i-n) SWIR at 1370 nm, employing NiOx HTL, ultimately enabling 4× shorter fall times photodiodes (∼800 ns...
Indium phosphide (InP) quantum dots have enabled light-emitting diodes (LEDs) that are heavy-metal-free, narrow in emission linewidth, and physically flexible. However, ZnO/ZnMgO, the electron-transporting layer (ETL) high-performance red InP/ZnSe/ZnS LEDs, suffers from high defect densities, quenches luminescence when deposited on InP, induces performance degradation arises due to trap migration ETL InP emitting layer. We posited formation of Zn2+ traps outer ZnS shell, combined with sulfur...
Organic-inorganic hybrid perovskites have emerged as a next-generation candidate for light-emitting device applications due to their excellent optical and electrical properties with narrow band emission compared organic emitters. The morphological control of perovskite films full surface coverage few defect sites is essential achieving highly efficient diodes (PeLEDs). Here, we obtain uniform film remarkably reduced number in crystal using chlorobenzene dropping. This effort leads the...
The mechanical flexibility of perovskite solar cells as well high power conversion efficiency is attracting increasing attention. In addition to existing empirical approaches, such cyclic bending tests, in this study we report the tensile properties materials themselves. Measuring free-standing critical because (1) represent realistic film-type layer including effects various defects, and (2) deformation behavior at any deformed state can be analyzed using solid mechanics with input....
All‐inorganic perovskite nanocrystal materials exhibit excellent light‐emitting properties in the visible range with narrow‐band emissions, relatively high stability levels, and photoluminescence quantum efficiency. A uniform morphology of film is necessary to realize highly efficient devices, but CsPbX 3 films has not been intensively studied. Here, a novel method presented obtain stable CsPbBr through drop‐casting poly(methyl methacrylate) (PMMA) matrix. The introduction nanocrystal:PMMA...