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K. Toko
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Journal Articles

Thermoelectric properties of sintered Ba2AgSi3 crystals and search for impurities to control conductivity type by first-principles calculation

K. Kajihara, Y. Koda, T. Ishiyama, S. Aonuki, K. Toko, S. Honda, M. Mesuda, T. Suemasu
Journal: Journal of Applied Physics
J. Appl. Phys. 135, 075107 (2024)
https://doi.org/10.1063/5.0190025
Published: February 2024
View article titled, Thermoelectric properties of sintered Ba<sub>2</sub>AgSi<sub>3</sub> crystals and search for impurities to control conductivity type by first-principles calculation
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Journal Articles

High thermoelectric performance in polycrystalline Yb3Ge5 thin films

T. Ishiyama, T. Ozawa, N. Saitoh, N. Yoshizawa, T. Suemasu, K. Toko
Journal: APL Materials
APL Mater. 12, 021119 (2024)
https://doi.org/10.1063/5.0172322
Published: February 2024
View article titled, High thermoelectric performance in polycrystalline Yb<sub>3</sub>Ge<sub>5</sub> thin films
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Includes: Supplementary data
Journal Articles

Thermoelectric properties of low-temperature-grown polycrystalline InAs1−xSbx films

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T. Nishida, T. Ishiyama, K. Nozawa, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 124, 012107 (2024)
https://doi.org/10.1063/5.0178996
Published: January 2024
View article titled, Thermoelectric properties of low-temperature-grown polycrystalline InAs<sub>1−</sub><sub><em>x</em></sub>Sb<sub><em>x</em></sub> films
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Journal Articles

High-electron mobility P-doped polycrystalline GeSn layers formed on insulators at low temperatures

K. Nozawa, T. Ishiyama, T. Nishida, N. Saitoh, N. Yoshizawa, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 122, 201901 (2023)
https://doi.org/10.1063/5.0152677
Published: May 2023
View article titled, High-electron mobility P-doped polycrystalline GeSn layers formed on insulators at low temperatures
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Journal Articles

High thermoelectric power factors in polycrystalline germanium thin films

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T. Ozawa, T. Imajo, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 119, 132101 (2021)
https://doi.org/10.1063/5.0056470
Published: September 2021
View article titled, High thermoelectric power factors in polycrystalline germanium thin films
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Journal Articles

Thickness-dependent thermoelectric properties of Si1−xGex films formed by Al-induced layer exchange

Editor’s Pick
T. Ozawa, K. Kusano, M. Murata, A. Yamamoto, T. Suemasu, K. Toko
Journal: Journal of Applied Physics
J. Appl. Phys. 129, 015303 (2021)
https://doi.org/10.1063/5.0025099
Published: January 2021
View article titled, Thickness-dependent thermoelectric properties of Si<sub>1−<em>x</em></sub>Ge<em><sub>x</sub></em> films formed by Al-induced layer exchange
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Journal Articles

Thin-film thermoelectric generator based on polycrystalline SiGe formed by Ag-induced layer exchange

M. Tsuji, M. Murata, A. Yamamoto, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 117, 162103 (2020)
https://doi.org/10.1063/5.0021880
Published: October 2020
View article titled, Thin-film thermoelectric generator based on polycrystalline SiGe formed by Ag-induced layer exchange
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Journal Articles

Influence of grain boundaries on the properties of polycrystalline germanium

T. Imajo, T. Suemasu, K. Toko
Journal: Journal of Applied Physics
J. Appl. Phys. 128, 075301 (2020)
https://doi.org/10.1063/5.0006469
Published: August 2020
View article titled, Influence of grain boundaries on the properties of polycrystalline germanium
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Journal Articles

Zn-induced layer exchange of p- and n-type nanocrystalline SiGe layers for flexible thermoelectrics

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M. Tsuji, K. Kusano, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 116, 182105 (2020)
https://doi.org/10.1063/5.0006958
Published: May 2020
View article titled, Zn-induced layer exchange of p- and n-type nanocrystalline SiGe layers for flexible thermoelectrics
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Journal Articles

Improving photoresponsivity in GaAs film grown on Al-induced-crystallized Ge on an insulator

T. Nishida, T. Suemasu, K. Toko
Journal: AIP Advances
AIP Advances 10, 015153 (2020)
https://doi.org/10.1063/1.5138677
Published: January 2020
View article titled, Improving photoresponsivity in GaAs film grown on Al-induced-crystallized Ge on an insulator
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Journal Articles

Polycrystalline thin-film transistors fabricated on high-mobility solid-phase-crystallized Ge on glass

K. Moto, K. Yamamoto, T. Imajo, T. Suemasu, H. Nakashima, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 114, 212107 (2019)
https://doi.org/10.1063/1.5093952
Published: May 2019
View article titled, Polycrystalline thin-film transistors fabricated on high-mobility solid-phase-crystallized Ge on glass
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Journal Articles

High photoresponsivity in a GaAs film synthesized on glass using a pseudo-single-crystal Ge seed layer

T. Nishida, K. Moto, N. Saitoh, N. Yoshizawa, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 114, 142103 (2019)
https://doi.org/10.1063/1.5091714
Published: April 2019
View article titled, High photoresponsivity in a GaAs film synthesized on glass using a pseudo-single-crystal Ge seed layer
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Journal Articles

Solid-phase crystallization of densified amorphous GeSn leading to high hole mobility (540 cm2/V s)

K. Moto, N. Saitoh, N. Yoshizawa, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 114, 112110 (2019)
https://doi.org/10.1063/1.5088847
Published: March 2019
View article titled, Solid-phase crystallization of densified amorphous GeSn leading to high hole mobility (540 cm<sup>2</sup>/V s)
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Journal Articles

Sb-doped crystallization of densified precursor for n-type polycrystalline Ge on an insulator with high carrier mobility

D. Takahara, K. Moto, T. Imajo, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 114, 082105 (2019)
https://doi.org/10.1063/1.5084191
Published: March 2019
View article titled, Sb-doped crystallization of densified precursor for n-type polycrystalline Ge on an insulator with high carrier mobility
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Journal Articles

High-quality multilayer graphene on an insulator formed by diffusion controlled Ni-induced layer exchange

H. Murata, N. Saitoh, N. Yoshizawa, T. Suemasu, K. Toko
Journal: Applied Physics Letters
Appl. Phys. Lett. 111, 243104 (2017)
https://doi.org/10.1063/1.5010982
Published: December 2017
View article titled, High-quality multilayer graphene on an insulator formed by diffusion controlled Ni-induced layer exchange
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Journal Articles

Silver-induced layer exchange for polycrystalline germanium on a flexible plastic substrate

R. Yoshimine, K. Toko, N. Saitoh, N. Yoshizawa, T. Suemasu
Journal: Journal of Applied Physics
J. Appl. Phys. 122, 215305 (2017)
https://doi.org/10.1063/1.5005002
Published: December 2017
View article titled, Silver-induced layer exchange for polycrystalline germanium on a flexible plastic substrate
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Journal Articles

Low temperature synthesis of highly oriented p-type Si1-xGex (x: 0–1) on an insulator by Al-induced layer exchange

K. Toko, K. Kusano, M. Nakata, T. Suemasu
Journal: Journal of Applied Physics
J. Appl. Phys. 122, 155305 (2017)
https://doi.org/10.1063/1.4996373
Published: October 2017
View article titled, Low temperature synthesis of highly oriented p-type Si<sub>1-</sub><sub><em>x</em></sub>Ge<sub><em>x</em></sub> (<em>x</em>: 0–1) on an insulator by Al-induced layer exchange
Open the PDF for Low temperature synthesis of highly oriented p-type Si<sub>1-</sub><sub><em>x</em></sub>Ge<sub><em>x</em></sub> (<em>x</em>: 0–1) on an insulator by Al-induced layer exchange in another window
Journal Articles

Direct synthesis of multilayer graphene on an insulator by Ni-induced layer exchange growth of amorphous carbon

H. Murata, K. Toko, N. Saitoh, N. Yoshizawa, T. Suemasu
Journal: Applied Physics Letters
Appl. Phys. Lett. 110, 033108 (2017)
https://doi.org/10.1063/1.4974318
Published: January 2017
View article titled, Direct synthesis of multilayer graphene on an insulator by Ni-induced layer exchange growth of amorphous carbon
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Journal Articles

Transfer-free synthesis of highly ordered Ge nanowire arrays on glass substrates

M. Nakata, K. Toko, W. Jevasuwan, N. Fukata, N. Saitoh, N. Yoshizawa, T. Suemasu
Journal: Applied Physics Letters
Appl. Phys. Lett. 107, 133102 (2015)
https://doi.org/10.1063/1.4932054
Published: September 2015
View article titled, Transfer-free synthesis of highly ordered Ge nanowire arrays on glass substrates
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Journal Articles

Formation of BaSi2 heterojunction solar cells using transparent MoOx hole transport layers

W. Du, R. Takabe, M. Baba, H. Takeuchi, K. O. Hara, K. Toko, N. Usami, T. Suemasu
Journal: Applied Physics Letters
Appl. Phys. Lett. 106, 122104 (2015)
https://doi.org/10.1063/1.4916348
Published: March 2015
View article titled, Formation of BaSi<sub>2</sub> heterojunction solar cells using transparent MoO<sub><em>x</em></sub> hole transport layers
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