Abstract
In this study a technique to sensitize electrodes with rhodamine B bonded to the surface is presented. To study both the attachment process and the mechanisms of spectral sensitization the system was investigated. The photocurrent produced by visible light illumination was studied as a function of electrolyte pH, illumination time, wavelength, and doping density. The observed photoresponse increased with doping density by a factor of 8 over the range investigated. Dye states were not removed from the surface during the course of illumination. The oxidized dye states were observed to be re‐reduced after biasing at sufficiently negative voltage. The observation that the amount of dye deposited on the surface is affected by the doping density of the samples used is discussed in terms of the nature of the bonding between dye and surface. The photocurrent quantum efficiency per absorbed photon was calculated to be about 0.01.
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