Reversible and irreversible redox series as probes of fundamental aspects of charge transfer across InP, WSe/sub 2/, and SnS/sub 2//acetonitrile interfaces: Progress report, May 15, 1986-May 14, 1987

Technical Report · Mon Dec 01 04:00:00 EST 1986

OSTI ID:6836288

Koval, C

Kinetics at metal electrode/solution interfaces has been studied for decades and the understanding of electron transfer processes is relatively mature. Despite numerous experimental studies during the past 10 years, many fundamental questions regarding redox processes at semiconductor/liquid junctions, even in the absence of light, remain unanswered. We have attempted to resolve some of these questions by making measurements that are analogous to those that were crucial for detailed understanding of electrochemistry at metals. The key aspects of our semiconductor studies are: (1) use of semiconducting materials and surface preparations that result in reproducible and stable interfacial energetics; (2) using both p- and n-type electrodes with a wide range of doping densities; (3) use of nonaqueous solvents to minimize surface corrosion processes; (4) thorough characterization of the interfacial energetics by measuring the capacitance of the space charge region over the same regions of electrode potential used in voltammetric experiments; and (5) use of substituted metallocenes as solution redox probes in order to insure 1e/sup -/, outer-sphere reactions with varying reduction potentials yet constant reorganization energies. 22 refs., 3 figs., 2 tabs.

• Research Organization: Colorado Univ., Boulder (USA)
• DOE Contract Number: FG02-84ER13247
• OSTI ID: 6836288
• Report Number(s): DOE/ER/13247-3; ON: DE87003994
• Country of Publication: United States
• Language: English

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CHALCOGENIDES
CHARGE TRANSPORT
CHEMICAL PREPARATION
CHEMISTRY
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTROCHEMISTRY
ELECTRODES
ENTROPY
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INDIUM PHOSPHIDES
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N-TYPE CONDUCTORS
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PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METAL COMPOUNDS
SELENIDES
SELENIUM COMPOUNDS
SEMICONDUCTOR MATERIALS
SOLAR CELLS
SOLAR EQUIPMENT
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN SELENIDES