Bo-han Li, Guan-hua Zhang, Yu Liang, Qun-qing Hao, Ju-long Sun, Chuan-yao Zhou, You-tian Tao, Xue-ming Yang, Ze-feng Ren. Femtosecond Time-Resolved Spectroscopic Photoemission Electron Microscopy for Probing Ultrafast Carrier Dynamics in Heterojunctions[J]. Chinese Journal of Chemical Physics , 2019, 32(4): 399-405. doi: 10.1063/1674-0068/cjcp1903044
Citation: Bo-han Li, Guan-hua Zhang, Yu Liang, Qun-qing Hao, Ju-long Sun, Chuan-yao Zhou, You-tian Tao, Xue-ming Yang, Ze-feng Ren. Femtosecond Time-Resolved Spectroscopic Photoemission Electron Microscopy for Probing Ultrafast Carrier Dynamics in Heterojunctions[J]. Chinese Journal of Chemical Physics , 2019, 32(4): 399-405. doi: 10.1063/1674-0068/cjcp1903044

Femtosecond Time-Resolved Spectroscopic Photoemission Electron Microscopy for Probing Ultrafast Carrier Dynamics in Heterojunctions

doi: 10.1063/1674-0068/cjcp1903044
Funds:  This work was conducted at the XPEEM endstation (BL09U, Dreamline) in the Shanghai Synchrotron Radiation Facility. This work was supported by the National Key R&D Program (No.2018YFA0208700 and No.2016YFA0200602), the National Natural Science Foundation of China (No.21688102 and No.21403222), the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDB17000000), and theYouth Innovation Promotion Association of Chinese Academy of Sciences (No.2017224).
  • Received Date: 2019-03-10
  • The fast developing semiconductor industry is pushing to shrink and speed up transistors. This trend requires us to understand carrier dynamics in semiconductor heterojunctions with both high spatial and temporal resolutions. Recently, we have successfully set up a timeresolved photoemission electron microscopy (TR-PEEM), which integrates the spectroscopic technique to measure electron densities at specific energy levels in space. This instrument provides us an unprecedented access to the evolution of electrons in terms of spatial location, time resolution, and energy, representing a new type of 4D spectro-microscopy. Here in this work, we present measurements of semiconductor performance with a time resolution of 184 fs, electron kinetic energy resolution of 150 meV, and spatial resolution of about 150 nm or better. We obtained time-resolved micro-area photoelectron spectra and energy-resolved TR-PEEM images on the Pb island on Si(111). These experimental results suggest that this instrument has the potential to be a powerful tool for investigating the carrier dynamics in various heterojunctions, which will deepen our understanding of semiconductor properties in the submicron/nanometer spatial scales and ultrafast time scales.
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Femtosecond Time-Resolved Spectroscopic Photoemission Electron Microscopy for Probing Ultrafast Carrier Dynamics in Heterojunctions

doi: 10.1063/1674-0068/cjcp1903044
Funds:  This work was conducted at the XPEEM endstation (BL09U, Dreamline) in the Shanghai Synchrotron Radiation Facility. This work was supported by the National Key R&D Program (No.2018YFA0208700 and No.2016YFA0200602), the National Natural Science Foundation of China (No.21688102 and No.21403222), the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDB17000000), and theYouth Innovation Promotion Association of Chinese Academy of Sciences (No.2017224).

Abstract: The fast developing semiconductor industry is pushing to shrink and speed up transistors. This trend requires us to understand carrier dynamics in semiconductor heterojunctions with both high spatial and temporal resolutions. Recently, we have successfully set up a timeresolved photoemission electron microscopy (TR-PEEM), which integrates the spectroscopic technique to measure electron densities at specific energy levels in space. This instrument provides us an unprecedented access to the evolution of electrons in terms of spatial location, time resolution, and energy, representing a new type of 4D spectro-microscopy. Here in this work, we present measurements of semiconductor performance with a time resolution of 184 fs, electron kinetic energy resolution of 150 meV, and spatial resolution of about 150 nm or better. We obtained time-resolved micro-area photoelectron spectra and energy-resolved TR-PEEM images on the Pb island on Si(111). These experimental results suggest that this instrument has the potential to be a powerful tool for investigating the carrier dynamics in various heterojunctions, which will deepen our understanding of semiconductor properties in the submicron/nanometer spatial scales and ultrafast time scales.

Bo-han Li, Guan-hua Zhang, Yu Liang, Qun-qing Hao, Ju-long Sun, Chuan-yao Zhou, You-tian Tao, Xue-ming Yang, Ze-feng Ren. Femtosecond Time-Resolved Spectroscopic Photoemission Electron Microscopy for Probing Ultrafast Carrier Dynamics in Heterojunctions[J]. Chinese Journal of Chemical Physics , 2019, 32(4): 399-405. doi: 10.1063/1674-0068/cjcp1903044
Citation: Bo-han Li, Guan-hua Zhang, Yu Liang, Qun-qing Hao, Ju-long Sun, Chuan-yao Zhou, You-tian Tao, Xue-ming Yang, Ze-feng Ren. Femtosecond Time-Resolved Spectroscopic Photoemission Electron Microscopy for Probing Ultrafast Carrier Dynamics in Heterojunctions[J]. Chinese Journal of Chemical Physics , 2019, 32(4): 399-405. doi: 10.1063/1674-0068/cjcp1903044

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