J. Choi

Publications37
h-index22
Citations2,974
Highly Influential Citations39
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Ligand exchange and the stoichiometry of metal chalcogenide nanocrystals: spectroscopic observation of facile metal-carboxylate displacement and binding.
We demonstrate that metal carboxylate complexes (L-M(O2CR)2, R = oleyl, tetradecyl, M = Cd, Pb) are readily displaced from carboxylate-terminated ME nanocrystals (ME = CdSe, CdS, PbSe, PbS) by… Expand
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PbSe nanocrystal excitonic solar cells.
We report the design, fabrication, and characterization of colloidal PbSe nanocrystal (NC)-based photovoltaic test structures that exhibit an excitonic solar cell mechanism. Charge extraction from… Expand
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Photogenerated exciton dissociation in highly coupled lead salt nanocrystal assemblies.
Internanocrystal coupling induced excitons dissociation in lead salt nanocrystal assemblies is investigated. By combining transient photoluminescence spectroscopy, grazing incidence small-angle X-ray… Expand
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Predicting nanocrystal shape through consideration of surface-ligand interactions.
Density functional calculations for the binding energy of oleic acid-based ligands on Pb-rich {100} and {111} facets of PbSe nanocrystals determine the surface energies as a function of ligand… Expand
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Shape-anisotropy driven symmetry transformations in nanocrystal superlattice polymorphs.
Despite intense research efforts by research groups worldwide, the potential of self-assembled nanocrystal superlattices (NCSLs) has not been realized due to an incomplete understanding of the… Expand
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Bright infrared quantum-dot light-emitting diodes through inter-dot spacing control.
Infrared light-emitting diodes are currently fabricated from direct-gap semiconductors using epitaxy, which makes them expensive and difficult to integrate with other materials. Light-emitting diodes… Expand
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Controlling nanocrystal superlattice symmetry and shape-anisotropic interactions through variable ligand surface coverage.
The assembly of colloidal nanocrystals (NCs) into superstructures with long-range translational and orientational order is sensitive to the molecular interactions between ligands bound to the NC… Expand
  • 136
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Structure of methylammonium lead iodide within mesoporous titanium dioxide: active material in high-performance perovskite solar cells.
We report the structure of methylammonium lead(II) iodide perovskite in mesoporous TiO2, as used in high-performance solar cells. Pair distribution function analysis of X-ray scattering reveals a two… Expand
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Rotational dynamics of organic cations in the CH3NH3PbI3 perovskite.
Methylammonium lead iodide (CH3NH3PbI3) based solar cells have shown impressive power conversion efficiencies of above 20%. However, the microscopic mechanism of the high photovoltaic performance is… Expand
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SnSe nanocrystals: synthesis, structure, optical properties, and surface chemistry.
The colloidal synthesis of SnSe nanoparticles is accomplished through the injection of bis[bis(trimethylsilyl)amino]tin(II) into hot trioctylphosphine:selenium in the presence of oleylamine. Through… Expand
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