Substitution Effects of Phenothiazine and Porphyrin Dyes in Dye-sensitized Solar Cells Page: 31
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spectrum revealed red-shifted bands compared to absorption spectral peaks shown in Figure 1la.
However, these spectral features were similar to the spectrum of the respective phenothiazine
derivatives adsorbed on FTO/TiO2 surface (see Figure 2.7). The IPCE exceeded 70% at the peak
maxima, however lower in terms of spectral coverage and efficiency when compared to N719
dye based DSSC.
100-
80- (i) "
" "" " "" "" (I
60 *; Eu'
a. 40
20
I ' I I ' I
400 500 600 700 800
Wavelength, nm
Figure 2.6. (a) Incident photon-to-current conversion action spectra of TiO2 electrodes
sensitized with (i) N719, (ii) 3 and (iii) 4 dyes in acetonitrile containing I3/I- (0.6 M PMII, 0.1
M LiI 0.05 M I2, and 0.5 M TBP) redox mediator using an AM 1.5 simulated light source with a
350 nm UV-cut off filter.31
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Hart, Aaron S. Substitution Effects of Phenothiazine and Porphyrin Dyes in Dye-sensitized Solar Cells, thesis, December 2013; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc407837/m1/37/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .