Time-Resolved Surface Photoelectron Spectroscopy of Photoexcited Electron and Hole Dynamics on GaAs Using 92 eV Laser Harmonic Source

Time-Resolved Surface Photoelectron Spectroscopy of Photoexcited Electron and Hole Dynamics on GaAs Using 92 eV Laser Harmonic Source

We have developed a time-resolved surface photoelectron spectroscopy system based on a 1.5 eV laser-pump and 92 eV high-order harmonic probe configuration that enables us to measure the electron and hole dynamics on a semiconductor surface. Core-level photoelectron spectra of GaAs(001) were successf...

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Veröffentlicht in:Japanese Journal of Applied Physics 2012-07, Vol.51 (7), p.072401-072401-6
Hauptverfasser: Oguri, Katsuya, Kato, Keiko, Nishikawa, Tadashi, Gotoh, Hideki, Tateno, Kouta, Sogawa, Tetsuomi, Nakano, Hidetoshi
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container_end_page 072401-6
container_issue 7
container_start_page 072401
container_title Japanese Journal of Applied Physics
container_volume 51
creator Oguri, Katsuya
Kato, Keiko
Nishikawa, Tadashi
Gotoh, Hideki
Tateno, Kouta
Sogawa, Tetsuomi
Nakano, Hidetoshi
description We have developed a time-resolved surface photoelectron spectroscopy system based on a 1.5 eV laser-pump and 92 eV high-order harmonic probe configuration that enables us to measure the electron and hole dynamics on a semiconductor surface. Core-level photoelectron spectra of GaAs(001) were successfully obtained with a single 59th harmonic, which was selected by using a pair of Mo/Si multilayer mirrors with a narrow reflection bandwidth. We observed transient energy shifts of the Ga 3d core level photoelectron peak of approximately 200 meV towards a higher binding energy, indicating that the surface potential changed due to the spatial separation of electron--hole pairs generated by the laser irradiation. The relatively slow recovery of the Ga 3d core level shift with a time constant of a few ns is dominated by the recombination process of the excess surface charges generated by the laser irradiation.
doi_str_mv 10.1143/JJAP.51.072401
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title Time-Resolved Surface Photoelectron Spectroscopy of Photoexcited Electron and Hole Dynamics on GaAs Using 92 eV Laser Harmonic Source
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