Influence of the Aggregation of a Carbazole Thiophene
Cyanoacrylate Sensitizer on Sensitized Photocurrents on ZnO Single
Crystals
- Publication date
- Publisher
Abstract
Dye sensitization of zinc oxide single
crystals by a carbazole
thiophene cyanoacrylate (MK-2) sensitizer deposited from THF and mixtures
of THF and water was investigated. AFM images show the formation of
larger aggregates, with the maximum size of 20–30 nm from mixtures
of THF and water, compared with 8–12 nm from pure THF. Sensitized
photocurrent spectra were correlated with the morphological results
from AFM imaging and indicate that aggregation in water results in
less efficient sensitization of the ZnO substrate. The presence of
the aggregation in solution due to water content was confirmed by
absorbance and fluorescence spectroscopies
