Non-linear kinetic model for oscillatory relaxation of the photovoltage effect on a Si(111)7 x 7 surface

Oscillatory relaxation of surface photovoltage has been observed by time-resolved photoemission spectroscopy on a Si(111)7 x 7 surface with a temporal period of several tens of nanoseconds. The oscillation was reproduced by solving non-linear Master equations that describe surface recombination of e...

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Bibliographic Details
Published in:Surface science 2014-06, Vol.624, p.70-75
Main Authors: Ogawa, M, Liu, R-Y, Lin, C-H, Yamamoto, S, Yukawa, R, Hobara, R, Tang, S-J, Matsuda, I
Format: Article
Language:English
Subjects:
High power lasers
Mathematical analysis
Mathematical models
Nanostructure
Nonlinearity
Oscillations
Photovoltages
Temporal logic
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Summary:Oscillatory relaxation of surface photovoltage has been observed by time-resolved photoemission spectroscopy on a Si(111)7 x 7 surface with a temporal period of several tens of nanoseconds. The oscillation was reproduced by solving non-linear Master equations that describe surface recombination of electron-hole pairs associated with the formation of exciton-like states at the surface. Appearance of non-linear phenomena is naturally expected by the model when high density photo-excited carriers are generated by the high power laser pulse.
ISSN:0039-6028
DOI:10.1016/j.susc.2014.01.014