Journal article

IMPORTANCE OF SURFACE-REACTIONS IN THE PHOTOCHEMISTRY OF ZNS COLLOIDS

DE DUNSTAN, A HAGFELDT, M ALMGREN, HOG SIEGBAHN, E MUKHTAR

JOURNAL OF PHYSICAL CHEMISTRY | AMER CHEMICAL SOC | Published : 1990

Abstract

The photochemistry of colloidal ZnS has been studied under a variety of experimental conditions. The time dependence of the photocorrosion has been examined by using time-resolved fluorescence, static fluorescence, and electron spectroscopy for chemical analysis (ESCA) techniques. A qualitative model for the semiconductor and its electrolyte interface is developed to explain the experimental observations where elemental Zn, S, and SO42- formed on the surface act as e-/h+ recombination centers. The photocorrosion products have been identified as SO42-, SO32-, and S. The importance of the surface chemistry in the photochemistry is shown via the correlation between the growth in the emission in..

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