Surface-photovoltage effects on adsorbate-covered semiconductor surfaces at low temperatures

Conference · · Journal of Vacuum Science and Technology. B, Microelectronics Processing and Phenomena; (United States)

OSTI ID:7237669

Kampen, T U; Troost, D; Hou, X Y; Koenders, L; Moench, W ^[1]

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1. Univ. Duisburg (Germany)

Surface photovoltage (SPV) needs to be considered in optical studies of electronic properties of semiconductor surfaces. The authors used a Kelvin probe (CPD), ultraviolet photoemission spectroscopy (UPS), and electric-field-induced Raman spectroscopy (EFIRS) to investigate the effect of SPV on adsorbate-induced variations of surface band bending at InP (110) and GaAs(110) surfaces at low temperatures. On InP (110) surfaces, which were exposed to Cs, H, and Cl{sub 2} at {approx}170K, the SPV was found to depend on the type of adsorbate and its coverage. After the light was switched off, the SPV was found to decay with time constants varying between some minutes up to a few hours. For GaAs(110) surfaces exposed to atomic hydrogen at 140K, they observed the light of a discharge lamp to flatten the bands. By using EFIRS, on the other hand, the buildup of surface band bending was unambiguously detected as a function of exposure to atomic hydrogen. The H-induced changes of surface band bending determined from variations of the work function measured in the dark with a Kelvin probe and of the ionization energy evaluated from the widths of UPS spectra excellently agree with the EFIRS-derived data.

• OSTI ID: 7237669
• Report Number(s): CONF-910115--
• Conference Information: Journal Name: Journal of Vacuum Science and Technology. B, Microelectronics Processing and Phenomena; (United States) Journal Volume: 9:4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ARSENIC COMPOUNDS
ARSENIDES
ELECTRIC CONTACTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
EMISSION SPECTROSCOPY
EQUIPMENT
EXTREME ULTRAVIOLET SPECTRA
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
INDIUM COMPOUNDS
INDIUM PHOSPHIDES
LASER SPECTROSCOPY
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHOTOELECTROMAGNETIC EFFECTS
PHOTOVOLTAIC EFFECT
PNICTIDES
RAMAN SPECTROSCOPY
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
ULTRAVIOLET SPECTRA