Abstract
With the use of ZnO single-crystal electrodes in an attenuated total reflection arrangement, it has been confirmed that the low quantum efficiency Phi of photocurrents sensitized by rhodamine B and rose bengal is attributable to a fast back-reaction between the oxidized dye and electrons in surface traps. This conclusion is based upon the observation that Phi is a constant function of electrode surface coverage Theta down to Theta = 0.001 where energy-transfer quenching is negligible. Two different types of surface sites are found, one which leads to an efficient sensitization of photocurrent by the adsorbed dye and another which leads to the rapid back-reaction. These sites are distinguishable by their different heats of adsorption. 17 references, 4 figures.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
