| Issue |
Europhys. Lett.
Volume 60, Number 6, December 2002
|
|
|---|---|---|
| Page(s) | 924 - 930 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00306-3 | |
| Published online | 01 December 2002 | |
Femtosecond time-resolved core-level photoelectron spectroscopy
tracking surface photovoltage transients on 
Fakultät für Physik, Universität
Bielefeld - Universitätsstr. 25 33615 Bielefeld, Germany
Received:
17
July
2002
Accepted:
3
October
2002
Visible-pump/extreme ultraviolet (EUV)-probe spectroscopy using
spectrally selected high harmonics of intense laser pulses is
utilised for tracking the charge carrier dynamics on
semiconductor surfaces. The time evolution of the electric field
in the surface layer of p-
is probed with
70
femtosecond EUV pulses by measuring the kinetic-energy
shifts of 
-3d core-level photoelectrons after excitation
with 3.1 femtosecond laser pulses. The observed transient
changes of the surface photovoltage reveal carrier transport from
the bulk to the surface to occur within 500
after
photoexcitation, while a subsequent relaxation is determined to
evolve on a time scale of a few tens of picoseconds.
PACS: 78.47.+p – Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter / 72.40.+w – Photoconduction and photovoltaic effects / 73.20.-r – Electron states at surfaces and interfaces
© EDP Sciences, 2002
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