Hiroki Kawai

Development and Validation of a Deep-Learning Algorithm to Estimate Human Podometrics

Kotaro Haruhara, Hiroki Kawai, Eisuke Kubo, Takaya Sasaki et autres

Background: Podocyte depletion is a common pathway in most progressive kidney diseases. We have recently established a method for estimating podometrics, namely podocyte number and size indices, using model-based stereology by measuring the number and diameter of podocyte nuclei on a double …

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Ultra-High Endurance (>1012) and High Drive-Current Selector in Sub-30nmΦ Cell using Stable Oxide Doped with As-Se Free High Melting-Point Compound

Yosuke Matsushima, Takeshi Iwasaki, T. Daibou, Takayuki Sasaki et autres

We demonstrate ultra-high endurance selector with excellent scalability toward high-performance cross-point storage class memory (SCM). By employing stable oxide doped with high melting-point $\left(T_{\mathrm{m}}\right)$ compound as a selector, atomic diffusion during cycling is strongly suppressed even for small cell (sub-30nm$\phi$) and high …

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High thermal stability of doped oxide semiconductor for monolithic 3D integration

Hiroki Kawai, Junji Kataoka, Nobuyoshi Saito, Tomomasa Ueda et autres

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Application of accelerated long-range corrected exchange functional [LC-DFT(2Gau)] to periodic boundary condition systems: CO adsorption on Cu(111) surface

K. Mishima, M. Kaneko, Jong‐Won Song, Hiroki Kawai et autres

Several different types of density functional theory (DFT) exchange correlation functionals were applied to a periodic boundary condition (PBC) system [carbon monoxide (CO) adsorbed on Cu(111): CO/Cu(111)] and the differences in the results calculated using these functionals were compared. The exchange correlation …

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Epitaxy of (GaN)1−x(ZnO)x Solid-Solution Thin Films with Widely Tunable Chemical Composition and Strong Visible Absorption

Chang Soo Yang, Yasushi Hirose, Naoki Kashiwa, Hiroki Kawai et autres

Solid solutions of the wide-band-gap semiconductors ZnO and GaN hold great promise for diverse optoelectronic applications, including photocatalysis, photovoltaics, and light-emitting diodes. However, the difficulty of synthesizing single-crystalline samples of these alloys thwarts a deeper understanding of their physics. The authors develop …

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Chemical potential dependence of defect species at Si(001)/SiO 2 interface

Hiroki Kawai, Yasushi Nakasaki, Takahisa Kanemura, Takamitsu Ishihara

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Density-functional study on the dopant-segregation mechanism: Chemical potential dependence of dopant-defect complex at Si/SiO2 interface

Hiroki Kawai, Yasushi Nakasaki, Takahisa Kanemura, Takamitsu Ishihara

Dopant segregation at Si/SiO2 interface has been a serious problem in silicon device technology. This paper reports a comprehensive density-functional study on the segregation mechanisms of boron, phosphorous, and arsenic at the Si/SiO2 interface. We found that three kinds of interfacial defects, …

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Organic–Inorganic Halide Perovskite Quasi-Particle Nature Analysis via the Interplay among Classic Solid-State Concepts, Density Functional, and Many-Body Perturbation Theory

Jacky Even, Giacomo Giorgi, Claudine Katan, Hiroki Kawai et autres

For the sake of clarity and coherence, this chapter devoted to the nature of quasi-particles in organic–inorganic halide perovskites will concentrate on lead-based perovskites. The exceptional light emission properties of layered hybrid organic-inorganic perovskite (HOP) thin 202 films or crystal structures have …

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Organic–Inorganic Halide Perovskite Quasi-Particle Nature Analysis via the Interplay among Classic Solid-State Concepts, Density Functional, and Many-Body Perturbation Theory

Jacky Even, Giacomo Giorgi, Claudine Katan, Hiroki Kawai et autres

A positron-annihilation study of residual vacancies in n -type-doped Si after annealing

Hiroki Kawai, Y. Higashi, Yasushi Nakasaki, Takamitsu Ishihara

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First-principles calculations on the stability of the vacancy cluster around n-type dopants in silicon

Hiroki Kawai, Yasushi Nakasaki, Takahisa Kanemura

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

We report on an analysis of hot-carrier lifetimes from electron-phonon interaction in lead iodide perovskites using first-principles calculations. Our calculations show that the holes in CsPbI3 have very long lifetimes in the valence band region situated 0.6 eV below the top of …

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