Chlorophyll b-modified nanocrystalline SnO2 semiconductor thin film as a photosensitive electrode

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Abstract
Nanocrystalline thin SnO2semiconductor films (thickness≤1 μm) have been modified with chlorophyll b (Chl‐b) by electrodeposition and adsorption methods for use as novel photosensitive electrodes in photoelectrochemical cells. Excitation of Chl‐b with monochromatic light produced photocurrents with an incident photon‐to‐photocurrent efficiency of around 8.5%. The charge injection from excited Chl‐b into the conduction band of the semiconductor SnO2 crystallites has been probed by time‐resolved microwave absorption.