Yuki Komatsubara

Fat-containing adnexal mass with a preserved ovary: Primary fallopian tube mature teratoma mimicking an ovarian lesion

Rika Yoshida, Yuki Komatsubara, Takeshi Yoshizako, Yukihisa Tamaki et autres

Primary mature cystic teratoma of the fallopian tube is an exceptionally rare condition with fewer than 100 cases reported in the English-language literature and is often misdiagnosed as an ovarian mature cystic teratoma due to its close anatomic proximity to the ovary. …

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Non-parabolic Band Effect of ZnO Enhanced by Hybridization with Complex Point Defect Donors for Boosting Thermoelectric Conversion

Yuki Komatsubara, Takafumi Ishibe, Seiya Kozuki, Kazunori Satō et autres

at 300 K, which is the highest among all the transparent thermoelectric thin film materials ever reported. This method provides a new approach to increase the thermoelectric power factor.

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Selective Anion Manipulation for Controlling the Thermoelectric Properties of Epitaxial SnO2 Films on r-Al2O3

Takafumi Ishibe, Seiya Kozuki, Yuki Komatsubara, Yuto Uematsu et autres

Introducing defects is one of the promising approaches for enhancing the thermoelectric property. In this study, we substantially reduce thermal conductivity while maintaining a high thermoelectric power factor (PF) by selectively manipulating O 2– anion in domain-engineered SnO 2 with conduction and …

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The local potential variation mapping including thermoelectromotive force in nanocomposite materials under non-thermal equilibrium

Yuki Komatsubara, Takafumi Ishibe, Yuji Miyato, Yoshiaki Nakamura

Abstract Thermoelectric nanocomposite materials are attracting much attention due to their high thermoelectric performance brought by effectively combining thermoelectric properties of the matrix and introduced nanostructures. However, understanding the mechanism of Seebeck coefficient enhancement brought in nanocomposite materials is difficult because there …

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Boosting Thermoelectric Performance in Epitaxial GeTe Film/Si by Domain Engineering and Point Defect Control

Takafumi Ishibe, Yuki Komatsubara, Kodai Ishikawa, Sho Takigawa et autres

This study demonstrates a simultaneous realization of ultralow thermal conductivity and high thermoelectric power factor in epitaxial GeTe thin films/Si substrates by a combination of the interface introduction by domain engineering and the suppression of Ge vacancy generation by point defect control. …

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Interface design of transparent thermoelectric epitaxial ZnO/SnO2 multilayer film for simultaneous realization of low thermal conductivity and high optical transmittance

Takafumi Ishibe, Yuki Komatsubara, Toranosuke Katayama, Yuichiro Yamashita et autres

A transparent thermoelectric material requires not only high thermoelectric performance but also high optical transmittance. However, in transparent nanostructured thermoelectric materials, the nanostructure interface brings the trade-off relationship between thermal conductivity and optical transmittance. We propose an approach for the simultaneous control …

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Low thermal conductivity of complex thermoelectric barium silicide film epitaxially grown on Si

Takafumi Ishibe, Jinichiro Chikada, T. TERADA, Yuki Komatsubara et autres

We achieved substantially low thermal conductivity by introducing some crystal disorder into complex material BaSi2 films on Si substrates for realization of a high-performance thermoelectric material. The BaSi2 films/Si exhibited a low thermal conductivity of 0.96 W m−1 K−1 without nanostructuring, which …

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Characterization of transparent SnO 2 film thermoelectric generator for practical use

Takafumi Ishibe, Yuki Komatsubara, Mutsunori Uenuma, Yukiharu Uraoka et autres

Direct mapping of local potential variation in thermoelectric material under temperature different

Yuki Komatsubara, Yuji Miyato, Takafumi Ishibe, Yoshiaki Nakamura

Carrier and phonon transport control by domain engineering for high-performance transparent thin film thermoelectric generator

Takafumi Ishibe, Atsuki Tomeda, Yuki Komatsubara, Reona Kitaura et autres

We develop transparent epitaxial SnO2 films with low thermal conductivity and high carrier mobility by domain engineering using the substrates with low symmetry: intentional control of the domain size and the defect density between crystal domains. The epitaxial SnO2 films on r-Al2O3 …

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Direct mapping of temperature-difference-induced potential variation under non-thermal equilibrium

Yuki Komatsubara, Takafumi Ishibe, Yuji Miyato, Shunya Sakane et autres

It is expected to develop the measurement system to obtain physical/chemical information with nanoscale space resolution related to the non-thermal equilibrium phenomena. In this study, we developed controlled temperature-gradient kelvin force microscopy (T-KFM) to measure the temperature difference (ΔT)-induced vacuum level variation …

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Phonon transport in the nano-system of Si and SiGe films with Ge nanodots and approach to ultralow thermal conductivity

Tatsuhiko Taniguchi, T. TERADA, Yuki Komatsubara, Takafumi Ishibe et autres

Phonon transport in the nano-system has been studied using well-designed nanostructured materials to observe and control the interesting phonon behaviors like ballistic phonon transport. Recently, we observed drastic thermal conductivity reduction in the films containing well-controlled nanodots. Here, we investigate whether this …

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