Do Kyung Lee

Here, we report on precursor engineering for a large-area perovskite film using an air-knife-assisted D-bar coater. Lead acetate (PbAc2) is stoichiometrically added in the mother solution consisting of methylammonium iodide (MAI) and lead iodide (PbI2) in 2-methoxyethanol (2ME), leading to MAPbI3 and byproduct methylammonium acetate (MAAc). Crystal growth can be controlled in the presence of MAAc while drying the wet film. An average power conversion efficiency (PCE) of 15.14% is achieved, where

High-quality large-area perovskite films are realized by an anti-solvent-free adduct approach using 1,3-dimethyl-3,4,5,6-tetrahydro-2(1<italic>H</italic>)-pyrimidinone (DMPU) as a Lewis base additive.

Since the groundbreaking report on solid-state perovskite solar cells (PSCs) in 2012, PSC receives great attention due to its high power conversion efficiency (PCE) obtainable at low-cost fabrication. A PCE of 9.7% in 2012 was swiftly improved to 25.7% in 2022 via perovskite composition engineering and grain size control. The excellent photovoltaic performance originates from the defect-tolerant property of organic lead halide perovskite associated with the antibonding nature of the valence band

Beginning with the breakthrough of solid‐state perovskite‐sensitized solar cells in 2012, the number of studies on photovoltaic devices based on halide perovskite materials has exploded. As of 2021, the certificated record power conversion efficiency (PCE) of small‐area perovskite solar cells (≈0.1 cm 2 active area) is 25.5%, making them very competitive with conventional silicon solar cells (26.7%) in terms of efficiency. For commercialization and large‐scale manufacturing purposes, it is neces

Level IV.

PURPOSE: This meta-analysis compared infection and revision rates in patients with rheumatoid arthritis (RA) and osteoarthritis (OA) who underwent total knee arthroplasty (TKA). Rates of superficial wound and deep periprosthetic infections were compared in the groups, as were whether revision rates associated with infectious and noninfectious causes differed in the RA and OA groups. METHODS: Studies were included in the meta-analysis if they (1) compared infection and revision rates after primar

Round ligament varicosities during pregnancy are rare, and can easily be mistaken for an inguinal hernia. On physical examination, round ligament varicosities and groin hernia are difficult to distinguish. The diagnosis of round ligament varicosities can be established on gray-scale and color Doppler sonography. We experienced a case of round ligament varicosities in which a 29-year-old woman presented symptoms at 36 weeks gestation. The patient was diagnosed using Doppler sonography, managed wi

This meta-analysis was designed to compare the incidence of deep vein thrombosis (DVT) and venous thromboembolism (VTE) following total knee arthroplasty (TKA) in patients with rheumatoid arthritis (RA) and osteoarthritis (OA). All studies directly comparing the post-TKA incidence of DVT and/or VTE in patients with RA and OA were included. For all comparisons, odds ratios and 95% confidence intervals (CI) were calculated for binary outcomes. Six studies were included in the meta-analysis. The po

Plasmon excitation and decay in gold nanoparticles (AuNPs) generates hot charge carriers that transfer to surface molecules and cause chemical transformation. We reveal that both electron- and hole-transfer channels must be open for reactions to occur. Furthermore, electron-transfer reactions can be switched on or off by a hole-transfer reaction. The reduction of 4-nitrobenzenethiol (NBT) to 4,4′-dimercaptoazobenzene (DMAB) via electron transfer from AuNPs to NBT does not occur in nanogaps betwe