Faculty Profiles - KUROKAWA Yasuyoshi

Papers - KUROKAWA Yasuyoshi

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Bayesian optimization of hydrogen plasma treatment in silicon quantum dot multilayer and application to solar cells Reviewed International journal

Fuga Kumagai, Kazuhiro Gotoh, Satoru Miyamoto, Shinya Kato, Kentaro Kutsukake, Noritaka Usami, Yasuyoshi Kurokawa

Nanoscale Research Letters Vol. 18 ( 1 ) page： 43 2023.3

Thermoelectric properties of Mg2Si thin films prepared by thermal evaporation of Mg and face-to-face annealing Reviewed International journal

Y. Kurokawa, K. Sato, K. Shibata, S. Kato, S. Miyamoto, K. Gotoh, T. Itoh, N. Usami

Materials Science in Semiconductor Processing Vol. 163 page： 107552 2023.8

Preparation and thermoelectric characterization of boron-doped Si nanocrystals/silicon oxide multilayers Reviewed International journal

Keisuke Shibata, Shinya Kato, Masashi Kurosawa, Kazuhiro Gotoh, Satoru Miyamoto, Noritaka Usami, Yasuyoshi Kurokawa

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 62 ( SC ) page： SC1074 2023.2

Application of Bayesian optimization for improved passivation performance in TiOx/SiOy/c-Si heterostructure by hydrogen plasma treatment Reviewed International journal

APPLIED PHYSICS EXPRESS Vol. 14 ( 2 ) page： 025503 2021.2

Preparation and thermoelectric characterization of phosphorus-doped Si nanocrystals/silicon oxide multilayers Reviewed International journal

Kobayashi Hisayoshi, Akaishi Ryushiro, Kato Shinya, Kurosawa Masashi, Usami Noritaka, Kurokawa Yasuyoshi

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 59 ( SG ) page： SGGF09 2020.4

Effect of the Niobium-Doped Titanium Oxide Thickness and Thermal Oxide Layer for Silicon Quantum Dot Solar Cells as a Dopant-Blocking Layer Reviewed International journal

Ryushiro Akaishi, Kohei Kitazawa, Kazuhiro Gotoh, Shinya Kato, Noritaka Usami, Yasuyoshi Kurokawa

Nanoscale Research Letters Vol. 15 ( 1 ) page： 39 2020

Local Structure of High Performance TiO <inf>x</inf> Electron-Selective Contact Revealed by Electron Energy Loss Spectroscopy Reviewed International journal

Mochizuki Takeya, Gotoh Kazuhiro, Kurokawa Yasuyoshi, Yamamoto Takahisa, Usami Noritaka

Advanced Materials Interfaces Vol. 6 ( 3 ) page： 1801645 2019.2

Bandgap tuning of silicon nanowire arrays for application to all-silicon tandem solar cells Reviewed International journal

Y. Kurokawa, M. Yano, S. Miyajima, and A. Yamada

Jpn. J. Appl. Phys. Vol. 56 page： 04CS03 2017.2

Photoluminescence from silicon quantum dots in Si quantum dots/amorphous SiC superlattice Reviewed International journal

Kurokawa Yasuyoshi, Tomita Shigeki, Miyajima Shinsuke, Yamada Akira, Konagai Makoto

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 46 ( 33-35 ) page： L833 - L835 2007.9

Preparation of nanocrystalline silicon in amorphous silicon carbide matrix Reviewed International journal

Kurokawa Yasuyoshi, Miyajima Shinsuke, Yamada Akira, Konagai Makoto

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 45 ( 37-41 ) page： L1064 - L1066 2006.10

Improvement of nano-texture uniformity formed on crystalline silicon surface by anisotropic alkaline etching for perovskite/silicon tandem solar cells Reviewed

Hiroto Yamaguchi, Yasuyoshi Kurokawa, Shohei Fukaya, Shinya KATO, Noritaka Usami

2025.3

Fabrication of Tilted Mg2Si/Ni Multilayer Composite Modules Using Polylactic Acid Resin Molds and Evaluation of the Thermoelectric Power Generation Performance Invited Reviewed

Tomohiro Kusumoto, Yasuyoshi Kurokawa, Noritaka Usami, Takashi Itoh

J. Jpn. Soc. Powder Powder Metallurgy Vol. 72 ( Supplement ) page： S1269 - S1273 2025.3

Suppression of film blistering in silicon nano-crystals/silicon oxide composite layer by insertion of intrinsic hydrogenated amorphous silicon layer Reviewed

Kazushi Mizutani, Kazuhiro Gotoh, Tomihisa Tachibana, Yasuyoshi Kurokawa, Noritaka Usami

2025.3

Development of Porous Silicon Nanowires with Conductive Paths and Large Specific Surface Area for Application to Lithium-Ion Batteries Reviewed International journal

Shinya Kato, Habin Li, Yosuke Ishii, Yasuyoshi Kurokawa, Tetsuo Soga

ECS Meeting Abstracts Vol. MA2024-02 page： 945 2024.11

Improvement for Passivation Performance of TiOx/SiOy/c-Si Heterostructures by Capping with Atomic-Layer-Deposited Nb Doped TiOx Layer Reviewed International journal

Shohei Fukaya, Kazuhiro Gotoh, Yasuyoshi Kurokawa, Noritaka Usami

Proc. 52nd IEEE Photovoltaic Specialists Conference page： 417 - 419 2024.11

Enhancement of Near-infrared Light Absorption by Nanoimprinted Light Trapping Structure Implemented into Si Heterojunction Solar Cells Reviewed International journal

Yasuyoshi Kurokawa, Yoshiko Iseki, Kazuhiro Gotoh, Satoru Miyamoto, Ryo Ozaki, Kyotaro Nakamura, Yoshio Ohshita, Noritaka Usami

Proc. 52nd IEEE Photovoltaic Specialists Conference page： 39 - 41 2024.11

Fabrication of Planar Thermoelectric Generators using Phosphorus-doped Silicon Nanocrystals/Amorphous Silicon Composite Films Reviewed International journal

Yasuyoshi Kurokawa, Keisuke Shibata, Shinya Kato, Masashi Kurosawa, Satoru Miyamoto, Takashi Itoh, Noritaka Usami

Ext. Abstr. 2024 International Conference on Solid State Devices and Materals page： 283 - 284 2024.9

Hydrogenation of silicon-nanocrystals-embedded silicon oxide passivating contacts Reviewed

Matsumi, M; Gotoh, K; Wilde, M; Kurokawa, Y; Fukutani, K; Usami, N

NANOTECHNOLOGY Vol. 35 ( 10 ) 2024.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Nanotechnology

We investigate the effect of hydrogen passivation of dangling bonds in silicon oxide passivating contacts with embedded silicon nanocrystals (NAnocrystalline Transport path in Ultra-thin dielectrics for REinforced passivation contact, NATURE contact). We first investigated the differences in electrical properties of the samples after hydrogen gas annealing and hydrogen plasma treatment (HPT). The results show that the NATURE contact was efficiently passivated by hydrogen after HPT owing to the introduction of hydrogen radicals into the structure. Furthermore, we examined the dependence of process parameters such as HPT temperature, duration, and H2 pressure, on the electrical properties and hydrogen depth profiles. As a result, HPT at 500 °C, 15 min, and 0.5 Torr resulted in a large amount of hydrogen inside the NATURE contact and the highest implied open-circuit voltage of 724 mV. Contact resistivity and surface roughness hardly increased when HPT was performed under the optimized condition, which only improved the passivation performance without deteriorating the electron transport properties of the NATURE contact.

DOI： 10.1088/1361-6528/ad115d

Web of Science

Scopus

PubMed

Core-shell yarn-structured triboelectric nanogenerator for harvesting both waterdrop and biomechanics energies Reviewed

Wang, HT; Kurokawa, Y; Zhang, JH; Gotoh, K; Liu, X; Miyamoto, S; Usami, N

APPLIED PHYSICS EXPRESS Vol. 17 ( 1 ) 2024.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Applied Physics Express

Wearable energy harvesters (WEHs) have garnered significant attention recently due to their promising capabilities in powering wearable devices. In this research, we present a core-shell yarn-structured triboelectric nanogenerator (CY-TENG) that operates in two modes: the single-electrode TENG (SE-TENG) and the droplet-based electricity generator. This design facilitates energy harvesting from both waterdrops and biomechanics. The CY-TENG is fabricated using fluorinated ethylene propylene ultrafine heat-shrink tubes combined with stainless-steel yarns, ensuring its flexibility, durability, and weavability. Such attributes underscore its potential as a dual-function WEH.

DOI： 10.35848/1882-0786/ad1f06

Web of Science

Scopus

Influence of Insertion Position of a LiF Buffer Layer on Passivation Performance of Crystalline Si/SiOy/TiOx/Al Heterostructures Reviewed International journal

Shohei Fukaya, Kazuhiro Gotoh, Takuya Matsui, Hitoshi Sai, Yasuyoshi Kurokawa, Noritaka Usami

Proc. 50th IEEE Photovoltaic Specialists Conference page： 1 - 3 2023.12

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Papers - KUROKAWA Yasuyoshi