A5052310183- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- Ga2O3 and related materials
- Conducting polymers and applications
- ZnO doping and properties
- Copper-based nanomaterials and applications
- DNA and Nucleic Acid Chemistry
- Porphyrin and Phthalocyanine Chemistry
- Advanced Photocatalysis Techniques
- Advanced biosensing and bioanalysis techniques
- Transition Metal Oxide Nanomaterials
- Supramolecular Chemistry and Complexes
- Organic Light-Emitting Diodes Research
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
Kyungpook National University
2021-2025
Yeungnam University
2010
Abstract Mixed tin–lead perovskites suffer from structural instability and rapid tin oxidation; thus, the investigation of their optimal composition ranges is important to address these inherent weaknesses. The critical role triple cations in mixed Sn–Pb iodides studied by performing a wide range compositional screenings over mechanochemically synthesized bulk solution‐processed thin films. A ternary phase map FA (Sn 0.6 Pb 0.4 )I 3 , MA(Sn Cs(Sn formed, promising window (FA 0.6− x MA Cs )Sn...
We present a surface reconstruction strategy for tin–lead perovskites, effectively addressing the issue of oxidized Sn fragments on surfaces and interfaces. Our treatment involving postfabrication iodide supplementation regulates undesired binding states reconstructs compositional gradient. Through surface-sensitive depth-resolved analysis, we unveil strong correlation among disorder, photovoltage, operational stability in perovskites. Surface-reconstructed perovskite films demonstrate...
Abstract A self‐powered, color‐filter‐free blue photodetector (PD) based on halide perovskites is reported. high external quantum efficiency (EQE) of 84.9%, which the highest reported EQE in PDs, achieved by engineering A‐site monovalent cations wide‐bandgap perovskites. The optimized composition formamidinium (FA)/methylammonium (MA) increases heat formation, yielding a uniform and smooth film. incorporation Cs + ions into FA/MA suppresses trap density charge‐carrier mobility, average...
Abstract All‐perovskite tandem solar cells have garnered considerable attention because of their potential to outperform single‐junction cells. However, charge recombination losses within narrow‐bandgap (NBG) perovskite subcells hamper the advancement this technology. Herein, we introduce a lithium salt, bis(trifluoromethanesulfonyl)imide (LiTFSI), for modifying NBG perovskites. Interestingly, LiTFSI bifunctionally passivates surface and bulk by dissociating into Li + TFSI − ions. We found...
Solvent engineering by Lewis-base solvent and anti-solvent is well known for forming uniform stable perovskite thin films. The phase crystallizes from an intermediate Lewis-adduct upon annealing-induced crystallization. Herein, it explored the effects of trimethyl phosphate (TMP), as a novel aprotic with low donor number film formation photovoltaic characteristics solar cells (PSCs). As compared to dimethylsulfoxide (DMSO) or dimethylformamide (DMF), usage TMP directly phase, i.e., reduces...
Herein, we investigate the effects of temperature and thiourea addition rate on synthesis copper sulfide nanoparticles (CuS NPs) via a chemical co-precipitation method, exploring their impact size morphology CuS NPs. Our systematic approach resulted in successful NPs with significantly smaller nanoflower sizes than previously reported literature, providing insights into nucleation growth mechanisms under various conditions. Furthermore, photocatalytic activity synthesized three types...
Hybrid density functional theory calculations are commonly used to investigate the electronic structure of semiconductor materials but have not been ideal for high-throughput due heavy computation costs. We developed a computational approach obtain band gap cost-effectively by employing only non-self-consistent field calculation methods also sparse k-point meshes Fock exchange potential. The benchmark showed that our method is at least 30 times faster than conventional hybrid quickly screen...
At high porphyrin densities, the effects of number and position positive charges periphery ring on stacking poly[d(A-T)2] was investigated using polarized spectroscopy, including circular linear dichroism (CD LD, respectively). The CD spectrum meso-tetrakis(N-methylpyridinium-4-yl)porphyrin(TMPyP) consisted two bands in Soret absorption region at low [porphyrin]/[DNA base] ratios (R ratios) changed to distinguishable categories bisignate with increasing R ratio. These spectra were attributed...
Organo-halide perovskite solar cells (PSCs) have emerged as next-generation photovoltaics, owing to their high power-conversion efficiency (PCE), lower production cost, and flexibility. ABX3-structured methylammonium lead triiodide (CH3NH3PbI3 or MAPbI3) is a widely studied light-absorbing material in PSCs. Interestingly, small amount of chlorine incorporation into MAPbI3 increases charge carrier diffusion lengths (from 129 nm 1069 nm), which enables planar structured PSCs with PCEs....
Abstract Halide perovskites have broad bandgap tunability, making them suitable for diverse applications in optoelectronics and photovoltaics. The optical of halide varies almost linearly with the ionic size, therefore, it can be controlled through compositional engineering. However, mechanism underlying this low‐bandgap variation is not yet fully understood. Thus, study comprehensively investigates bowing cesium–lead mixed‐halide using engineering demonstrates that extremely small a variety...
Herein, we investigate the effects of temperature and thiourea addition rate on synthesis copper sulfide nanoparticles (CuS NPs) via a chemical co-precipitation method, exploring their impact size morphology CuS NPs. Our systematic approach resulted in successful NPs with significantly smaller nanoflower sizes than previously reported literature, providing insights into nucleation growth mechanisms under various conditions. Furthermore, photocatalytic activity synthesized three types...
The fluorescence of ethidium bound to DNA, poly[d(A-T)2], and poly[d(G-C)2] at a [ethidium]/[DNA] ratio 0.005 was quenched by porphyrins when both the simultaneously same polynucleotide. quenching tested using “inner sphere” “Forster resonance energy transfer” (FRET) models, with latter found contribute, least in part, quenching. Meso-tetrakis(Nmethylpyridinium-4-yl)porphyrin (TMPyP) exhibited higher FRET efficiency than cis-bis(Nmethylpyridinium-4-yl)porphyrin (BMPyP) for all DNA...