Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe

Mario Okawa; Yuka Akabane; Mizuki Maeda; Gangjian Tan; Li Dong Zhao; Mercouri G. Kanatzidis; Takeshi Suzuki; Mari Watanabe; Jiadi Xu; Qianhui Ren; Masami Fujisawa; Teruto Kanai; Jiro Itatani; Shik Shin; Kozo Okazaki; Naurang L. Saini; Takashi Mizokawa

doi:10.1016/j.scriptamat.2022.115081

Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe

Mario Okawa^*, Yuka Akabane, Mizuki Maeda, Gangjian Tan, Li Dong Zhao, Mercouri G. Kanatzidis, Takeshi Suzuki, Mari Watanabe, Jiadi Xu, Qianhui Ren, Masami Fujisawa, Teruto Kanai, Jiro Itatani, Shik Shin, Kozo Okazaki, Naurang L. Saini, Takashi Mizokawa

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We report time- and angle-resolved photoemission spectroscopy on SnSe which currently attracts great interest due to its extremely high thermoelectric performance. Laser-assisted photoemission signals are observed within ±20 fs of the pump pulse arrival. Around 30–50 fs after the photoexcitation, the conduction band minima are not populated by the photoexcited electrons while the valence bands are considerably broadened. In going from 90 fs to 550 fs after the photoexcitation, the photoexcited carriers are decayed into the multiple conduction band minima. The observed conduction bands are consistent with the band structure calculations. The multiple conduction minima suggest possibility of high and anisotropic thermoelectric performance of n-type SnSe single crystal if it is realized.

Original language	English (US)
Article number	115081
Journal	Scripta Materialia
Volume	223
DOIs	https://doi.org/10.1016/j.scriptamat.2022.115081
State	Published - Jan 15 2023

Funding

At Tokyo, this work was supported by the Grants-in-Aid from the Japan Society for the Promotion of Science (JSPS) (No. 19H00659). At Argonne, this work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (materials synthesis). This work was carried out under the Visiting Researcher's Program of Institute for Solid State Physics, University of Tokyo (Proposal No. B219). At Tokyo, this work was supported by the Grants-in-Aid from the Japan Society for the Promotion of Science (JSPS) (No. 19H00659). At Argonne, this work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (materials synthesis). This work was carried out under the Visiting Researcher\u2019s Program of Institute for Solid State Physics, University of Tokyo (Proposal No. B219).

Keywords

Angle-resolved photoemission sepctroscopy (ARPES)
Dynamic phenomena
Electronic structure
Semiconductor
Thermoelectric materials

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2022.115081

Cite this

Okawa, M., Akabane, Y., Maeda, M., Tan, G., Zhao, L. D., Kanatzidis, M. G., Suzuki, T., Watanabe, M., Xu, J., Ren, Q., Fujisawa, M., Kanai, T., Itatani, J., Shin, S., Okazaki, K., Saini, N. L., & Mizokawa, T. (2023). Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe. Scripta Materialia, 223, Article 115081. https://doi.org/10.1016/j.scriptamat.2022.115081

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title = "Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe",

abstract = "We report time- and angle-resolved photoemission spectroscopy on SnSe which currently attracts great interest due to its extremely high thermoelectric performance. Laser-assisted photoemission signals are observed within ±20 fs of the pump pulse arrival. Around 30–50 fs after the photoexcitation, the conduction band minima are not populated by the photoexcited electrons while the valence bands are considerably broadened. In going from 90 fs to 550 fs after the photoexcitation, the photoexcited carriers are decayed into the multiple conduction band minima. The observed conduction bands are consistent with the band structure calculations. The multiple conduction minima suggest possibility of high and anisotropic thermoelectric performance of n-type SnSe single crystal if it is realized.",

keywords = "Angle-resolved photoemission sepctroscopy (ARPES), Dynamic phenomena, Electronic structure, Semiconductor, Thermoelectric materials",

author = "Mario Okawa and Yuka Akabane and Mizuki Maeda and Gangjian Tan and Zhao, {Li Dong} and Kanatzidis, {Mercouri G.} and Takeshi Suzuki and Mari Watanabe and Jiadi Xu and Qianhui Ren and Masami Fujisawa and Teruto Kanai and Jiro Itatani and Shik Shin and Kozo Okazaki and Saini, {Naurang L.} and Takashi Mizokawa",

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year = "2023",

month = jan,

day = "15",

doi = "10.1016/j.scriptamat.2022.115081",

language = "English (US)",

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Okawa, M, Akabane, Y, Maeda, M, Tan, G, Zhao, LD, Kanatzidis, MG, Suzuki, T, Watanabe, M, Xu, J, Ren, Q, Fujisawa, M, Kanai, T, Itatani, J, Shin, S, Okazaki, K, Saini, NL & Mizokawa, T 2023, 'Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe', Scripta Materialia, vol. 223, 115081. https://doi.org/10.1016/j.scriptamat.2022.115081

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T1 - Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe

AU - Okawa, Mario

AU - Akabane, Yuka

AU - Maeda, Mizuki

AU - Tan, Gangjian

AU - Zhao, Li Dong

AU - Kanatzidis, Mercouri G.

AU - Suzuki, Takeshi

AU - Watanabe, Mari

AU - Xu, Jiadi

AU - Ren, Qianhui

AU - Fujisawa, Masami

AU - Kanai, Teruto

AU - Itatani, Jiro

AU - Shin, Shik

AU - Okazaki, Kozo

AU - Saini, Naurang L.

AU - Mizokawa, Takashi

PY - 2023/1/15

Y1 - 2023/1/15

N2 - We report time- and angle-resolved photoemission spectroscopy on SnSe which currently attracts great interest due to its extremely high thermoelectric performance. Laser-assisted photoemission signals are observed within ±20 fs of the pump pulse arrival. Around 30–50 fs after the photoexcitation, the conduction band minima are not populated by the photoexcited electrons while the valence bands are considerably broadened. In going from 90 fs to 550 fs after the photoexcitation, the photoexcited carriers are decayed into the multiple conduction band minima. The observed conduction bands are consistent with the band structure calculations. The multiple conduction minima suggest possibility of high and anisotropic thermoelectric performance of n-type SnSe single crystal if it is realized.

AB - We report time- and angle-resolved photoemission spectroscopy on SnSe which currently attracts great interest due to its extremely high thermoelectric performance. Laser-assisted photoemission signals are observed within ±20 fs of the pump pulse arrival. Around 30–50 fs after the photoexcitation, the conduction band minima are not populated by the photoexcited electrons while the valence bands are considerably broadened. In going from 90 fs to 550 fs after the photoexcitation, the photoexcited carriers are decayed into the multiple conduction band minima. The observed conduction bands are consistent with the band structure calculations. The multiple conduction minima suggest possibility of high and anisotropic thermoelectric performance of n-type SnSe single crystal if it is realized.

KW - Angle-resolved photoemission sepctroscopy (ARPES)

KW - Dynamic phenomena

KW - Electronic structure

KW - Semiconductor

KW - Thermoelectric materials

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JO - Scripta Materialia

JF - Scripta Materialia

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Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe

Abstract

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Keywords

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