His primary scientific interests are in Chemical physics, Atomic physics, Density functional theory, Ab initio and Perovskite. The concepts of his Chemical physics study are interwoven with issues in Chemical reaction, Nanotechnology, Molecular dynamics, Molecule and Electron transfer. His studies in Atomic physics integrate themes in fields like Photodissociation and Path integral Monte Carlo.
His study in Density functional theory is interdisciplinary in nature, drawing from both Charge, Electron and Electronic band structure. His biological study spans a wide range of topics, including Ab initio quantum chemistry methods, Formaldehyde, Molecular physics, Bond-dissociation energy and Computational chemistry. His Perovskite research is multidisciplinary, incorporating perspectives in Organic inorganic, Inorganic chemistry, Iodide, Hysteresis and Carrier lifetime.
His primary areas of investigation include Atomic physics, Chemical physics, Ab initio, Density functional theory and Molecule. His work deals with themes such as Photodissociation and Electron, which intersect with Atomic physics. His research integrates issues of Nanotechnology, Molecular dynamics, Charge, Perovskite and Organic solar cell in his study of Chemical physics.
The Perovskite study combines topics in areas such as Halide and Iodide. His Ab initio study which covers Ab initio quantum chemistry methods that intersects with Potential energy surface. Koichi Yamashita combines subjects such as Crystallography and Physical chemistry with his study of Density functional theory.
Koichi Yamashita spends much of his time researching Chemical physics, Density functional theory, Organic solar cell, Perovskite and Crystallography. His Chemical physics study combines topics in areas such as Charge density, Nanotechnology, Halide, Charge separation and Band gap. His work in Band gap addresses issues such as Semiconductor, which are connected to fields such as Solar cell and Inorganic chemistry.
Koichi Yamashita has researched Density functional theory in several fields, including Tight binding, Characterization, Non-covalent interactions, Atoms in molecules and van der Waals force. His Perovskite research integrates issues from Computational chemistry, Molecular dynamics, Carrier lifetime, Hydrogen bond and Triiodide. Koichi Yamashita focuses mostly in the field of Dielectric, narrowing it down to matters related to Valence and, in some cases, Ab initio.
Koichi Yamashita mainly investigates Chemical physics, Band gap, Perovskite, Intermolecular force and Density functional theory. His Chemical physics research is multidisciplinary, relying on both Nanotechnology, Charge density, Molecule, Computational chemistry and Binding energy. His work in Perovskite covers topics such as Hydrogen bond which are related to areas like van der Waals force.
His Intermolecular force research incorporates themes from Molecular physics and Atoms in molecules. His research in Density functional theory intersects with topics in Quantum well, Non-covalent interactions, Electronic correlation and Work. His study looks at the relationship between Exciton and topics such as Excitation, which overlap with Ab initio.
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Small photocarrier effective masses featuring ambipolar transport in methylammonium lead iodide perovskite: A density functional analysis
Giacomo Giorgi;Jun-Ichi Fujisawa;Jun-Ichi Fujisawa;Hiroshi Segawa;Koichi Yamashita.
Journal of Physical Chemistry Letters (2013)
Charge Carrier Trapping at Surface Defects of Perovskite Solar Cell Absorbers: A First-Principles Study
Hiroki Uratani;Koichi Yamashita.
Journal of Physical Chemistry Letters (2017)
Redox-responsive molecular helices with highly condensed π -clouds
Eisuke Ohta;Hiroyasu Sato;Shinji Ando;Atsuko Kosaka.
Nature Chemistry (2011)
Black Phosphorus as a High-Capacity, High-Capability Negative Electrode for Sodium-Ion Batteries: Investigation of the Electrode/Electrolyte Interface
Mouad Dahbi;Mouad Dahbi;Naoaki Yabuuchi;Naoaki Yabuuchi;Mika Fukunishi;Kei Kubota;Kei Kubota.
Chemistry of Materials (2016)
Theoretical study of the structure and optical properties of carbon-doped rutile and anatase titanium oxides
Hideyuki Kamisaka;Takahisa Adachi;Koichi Yamashita.
Journal of Chemical Physics (2005)
Cation Role in Structural and Electronic Properties of 3D Organic–Inorganic Halide Perovskites: A DFT Analysis
Giacomo Giorgi;Jun Ichi Fujisawa;Jun Ichi Fujisawa;Hiroshi Segawa;Koichi Yamashita.
Journal of Physical Chemistry C (2014)
Electronic Band Structure of Transparent Conductor: Nb-Doped Anatase TiO2
Taro Hitosugi;Hideyuki Kamisaka;Koichi Yamashita;Hiroyuki Nogawa.
Applied Physics Express (2008)
Ab initio MO study of neutral and cationic boron clusters
Hiroshi Kato;Koichi Yamashita;Keiji Morokuma.
Chemical Physics Letters (1992)
The mechanism of slow hot-hole cooling in lead-iodide perovskite: first-principles calculation on carrier lifetime from electron-phonon interaction.
Hiroki Kawai;Giacomo Giorgi;Andrea Marini;Koichi Yamashita.
Nano Letters (2015)
Organic - Inorganic hybrid lead iodide perovskite featuring zero dipole moment guanidinium cations: A theoretical analysis
Giacomo Giorgi;Jun Ichi Fujisawa;Jun Ichi Fujisawa;Hiroshi Segawa;Koichi Yamashita.
Journal of Physical Chemistry C (2015)
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