Carrier Relaxation and Multiplication in Bi Doped Graphene

Qi Liu; Xianyang Lu; Yuxiang Liu; Zhihao Li; Pengfei Yan; Wang Chen; Qinghao Meng; Yongheng Zhang; Chi Yung Yam; Liang He; Yu Yan; Yi Zhang; Jing Wu; Thomas Frauenheim; Rong Zhang; Yongbing Xu

doi:10.1002/smll.202206218

Carrier Relaxation and Multiplication in Bi Doped Graphene

Qi Liu, Xianyang Lu^*, Yuxiang Liu, Zhihao Li, Pengfei Yan, Wang Chen, Qinghao Meng, Yongheng Zhang, Chi Yung Yam, Liang He, Yu Yan, Yi Zhang, Jing Wu, Thomas Frauenheim, Rong Zhang, Yongbing Xu

^*Corresponding author for this work

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

Abstract

By introducing different contents of Bi adatoms to the surface of monolayer graphene, the carrier concentration and their dynamics have been effectively modulated as probed directly by the time- and angle-resolved photoemission spectroscopy technique. The Bi adatoms are found to assist acoustic phonon scattering events mediated by supercollisions as the disorder effectively relaxes the momentum conservation constraint. A reduced carrier multiplication has been observed, which is related to the shrinking Fermi sea for scattering, as confirmed by time-dependent density functional theory simulation. This work gives insight into hot carrier dynamics in graphene, which is crucial for promoting the application of photoelectric devices.

Original language	English
Journal	Small
DOIs	https://doi.org/10.1002/smll.202206218
Publication status	E-pub ahead of print - 20 Jan 2023

Bibliographical note

Funding Information:
Q.L., X.L., and Y.L. contributed equally to this work. This work was supported by the National Key Research and Development Program of China (Grant Nos. 2021YFB3601600), the National Natural Science Foundation of China (Grant Nos. 12104216, 61427812, and 92165205), the Natural Science Foundation of Jiangsu Province of China (Nos. BK20200307, BK20192006, and BK20180056), the DFG (Grant No. RTG2247) and the Supercomputer Center of Northern Germany via HLRN (Grant No. hbp0067).

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

acoustic phonon-electron interaction
carrier multiplication
graphene
optical phonon-electron interaction

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10.1002/smll.202206218

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title = "Carrier Relaxation and Multiplication in Bi Doped Graphene",

abstract = "By introducing different contents of Bi adatoms to the surface of monolayer graphene, the carrier concentration and their dynamics have been effectively modulated as probed directly by the time- and angle-resolved photoemission spectroscopy technique. The Bi adatoms are found to assist acoustic phonon scattering events mediated by supercollisions as the disorder effectively relaxes the momentum conservation constraint. A reduced carrier multiplication has been observed, which is related to the shrinking Fermi sea for scattering, as confirmed by time-dependent density functional theory simulation. This work gives insight into hot carrier dynamics in graphene, which is crucial for promoting the application of photoelectric devices.",

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author = "Qi Liu and Xianyang Lu and Yuxiang Liu and Zhihao Li and Pengfei Yan and Wang Chen and Qinghao Meng and Yongheng Zhang and Yam, {Chi Yung} and Liang He and Yu Yan and Yi Zhang and Jing Wu and Thomas Frauenheim and Rong Zhang and Yongbing Xu",

note = "Funding Information: Q.L., X.L., and Y.L. contributed equally to this work. This work was supported by the National Key Research and Development Program of China (Grant Nos. 2021YFB3601600), the National Natural Science Foundation of China (Grant Nos. 12104216, 61427812, and 92165205), the Natural Science Foundation of Jiangsu Province of China (Nos. BK20200307, BK20192006, and BK20180056), the DFG (Grant No. RTG2247) and the Supercomputer Center of Northern Germany via HLRN (Grant No. hbp0067). Publisher Copyright: {\textcopyright} 2023 Wiley-VCH GmbH.",

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doi = "10.1002/smll.202206218",

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journal = "Small",

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T1 - Carrier Relaxation and Multiplication in Bi Doped Graphene

AU - Liu, Qi

AU - Lu, Xianyang

AU - Liu, Yuxiang

AU - Li, Zhihao

AU - Yan, Pengfei

AU - Chen, Wang

AU - Meng, Qinghao

AU - Zhang, Yongheng

AU - Yam, Chi Yung

AU - He, Liang

AU - Yan, Yu

AU - Zhang, Yi

AU - Wu, Jing

AU - Frauenheim, Thomas

AU - Zhang, Rong

AU - Xu, Yongbing

N1 - Funding Information: Q.L., X.L., and Y.L. contributed equally to this work. This work was supported by the National Key Research and Development Program of China (Grant Nos. 2021YFB3601600), the National Natural Science Foundation of China (Grant Nos. 12104216, 61427812, and 92165205), the Natural Science Foundation of Jiangsu Province of China (Nos. BK20200307, BK20192006, and BK20180056), the DFG (Grant No. RTG2247) and the Supercomputer Center of Northern Germany via HLRN (Grant No. hbp0067). Publisher Copyright: © 2023 Wiley-VCH GmbH.

PY - 2023/1/20

Y1 - 2023/1/20

N2 - By introducing different contents of Bi adatoms to the surface of monolayer graphene, the carrier concentration and their dynamics have been effectively modulated as probed directly by the time- and angle-resolved photoemission spectroscopy technique. The Bi adatoms are found to assist acoustic phonon scattering events mediated by supercollisions as the disorder effectively relaxes the momentum conservation constraint. A reduced carrier multiplication has been observed, which is related to the shrinking Fermi sea for scattering, as confirmed by time-dependent density functional theory simulation. This work gives insight into hot carrier dynamics in graphene, which is crucial for promoting the application of photoelectric devices.

AB - By introducing different contents of Bi adatoms to the surface of monolayer graphene, the carrier concentration and their dynamics have been effectively modulated as probed directly by the time- and angle-resolved photoemission spectroscopy technique. The Bi adatoms are found to assist acoustic phonon scattering events mediated by supercollisions as the disorder effectively relaxes the momentum conservation constraint. A reduced carrier multiplication has been observed, which is related to the shrinking Fermi sea for scattering, as confirmed by time-dependent density functional theory simulation. This work gives insight into hot carrier dynamics in graphene, which is crucial for promoting the application of photoelectric devices.

KW - acoustic phonon-electron interaction

KW - carrier multiplication

KW - graphene

KW - optical phonon-electron interaction

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DO - 10.1002/smll.202206218

M3 - Article

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SN - 1613-6810

JO - Small

JF - Small

ER -

Carrier Relaxation and Multiplication in Bi Doped Graphene

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Bibliographical note

Keywords

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