INVESTIGADORES
ALDAO celso Manuel
artículos
Título:
Surface Photovoltages due to Pulsed Sources: Implications for Photoemission Spectroscopy
Autor/es:
C.M. ALDAO; J.F. VALTUEÑA; I. IZPURA; E. MUÑOZ
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
APS
Referencias:
Año: 1994 vol. 50 p. 17729 - 17731
ISSN:
0163-1829
Resumen:
Photoemission spectroscopy experiments have shown that photons used to determine semiconductor band
bending can induce measurable photovoltages. Because of the pulsed-photon source, the charging and discharging processes taking place at the semiconductor surface have been proposed as seriously affecting
synchrotron-radiation photoemission measurements [M. H. Hecht, Phys. Rev. B 43, 12102 (1991)].In this
paper we present some illustrative experiments showing the effects of using a pulsed-photon source on the
surface potential of n-type GaAs with a semitransparent Schottky diode. Implications for synchrotron-radiation
photoemission results are discussed. We conclude that in these experiments the originated photovoltages are
practically flat, and that they can be calculated from average photocurrent data, taken as effective restoring
currents.