Detection of hot electrons at a p-InP/Pt rotating ring/disk photoelectrode

Journal Article · Wed Sep 08 04:00:00 EDT 1993 · Journal of the American Chemical Society; (United States)

DOI:https://doi.org/10.1021/ja00071a052· OSTI ID:5064684

Koval, C A; Torres, R ^[1]

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1. Univ. of Colorado, Boulder, CO (United States)

Acetonitrile solutions containing the reversible redox couple decamethylferrocene (1 + /0) (DFER, E[sup o[prime]] = -0.40 V) and (dibromoethyl)benzene (DBEB, E[sub 1/2] = -1.12 V) were used to detect steady-state photocurrent attributable to hot electrons at p-InP photocathodes. Reduction of DBEB at illuminated p-InP disk electrodes produces bromide ions which were quantitatively determined through their oxidation at a Pt ring electrode. Both high-doped and low-doped p-InP electrodes yielded high internal quantum yields for photoconversion (80% and 90%, respectively); however, illumination of high-doped samples invariably produced greater percentages (>30%) of DBEB reduction. Observed dependencies of the percent DBEB reduction on doping density, applied potential, light intensity, and conduction band edge position are all consistent with a type I hot carrier mechanism. 23 refs., 9 figs., 2 tabs.

• DOE Contract Number: FG02-84ER13247
• OSTI ID: 5064684
• Journal Information: Journal of the American Chemical Society; (United States), Journal Name: Journal of the American Chemical Society; (United States) Vol. 115:18; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140501 -- Solar Energy Conversion-- Photovoltaic Conversion
36 MATERIALS SCIENCE
360606 -- Other Materials-- Physical Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
CATHODES
CHARGE CARRIERS
CHEMICAL REACTIONS
CONVERSION
CURRENTS
DATA
DETECTION
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRODES
ELECTRONIC STRUCTURE
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY CONVERSION
EQUIPMENT
EXPERIMENTAL DATA
FERMIONS
INDIUM COMPOUNDS
INDIUM PHOSPHIDE SOLAR CELLS
INDIUM PHOSPHIDES
INFORMATION
LEPTONS
MATERIALS
METALS
NUMERICAL DATA
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHOTOCATHODES
PHOTOCURRENTS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
PNICTIDES
REDOX REACTIONS
SEMICONDUCTOR MATERIALS
SOLAR CELLS
SOLAR ENERGY CONVERSION
SOLAR EQUIPMENT
TRANSITION ELEMENTS