8
N. CHAUDHRI ET AL.
demonstrated moderate response while the ester group
containing porpyrinic dyes exhibited very poor response
towards IPCE, which is consistent with the Jsc and Voc
values.
H2TriPyMCPP showed Voc, Jsc and fill factor values
of 575 mV, 31.82 A/m2 and 0.642, respectively with the
PCE value of (h) 3.26% (Table 2).
Grätzel M. J. Am. Chem. Soc. 2005; 127: 16835–
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Wang P. ACS Nano 2010; 4: 6032–6038. (c) Spettel
KE and Damrauer NH. J. Phys. Chem. C 2016; 120:
10815–10829.
5. Chen CY, Wang M, Li JY, Pootrakulchote N, Aliba-
baei L, Ngoc-Le CH, Decoppet JD, Tsai JH, Grätzel
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CONCLUSIONS
In summary, we have synthesized meso-substituted
A3B/A4 free base porphyrins having pyridyl, carboxy
phenyl and amino groups in good yields via a simplified
two-step process, and we have investigated the effect
of these functional groups on their photosensitization
properties. The highest power conversion efficiencies
(h) of 3.26%, 2.94% and 2.84% were achieved for the
DSSC fabricated using H2TriPyMCPP, H2TAPP and
H2MPyTriCPP dyes, respectively. The introduction of
more number of electron donating groups such as the
–NH2 group enhances the PCE% as depicted by H2TAPP
which shows a fourfold higher efficiency (2.84%) as
compared to H2TriPMAPP (0.7%). Tripyridyl mono-
carboxyphenylporphyrin has shown higher PCE value as
compared to monopyridyltricarboxyphenylporphyrin due
to efficient coordination and feasible electron injection
from pyridyl group(s) to TiO2. Porphyrins having more
numbers of electron-donating/electron-injecting groups
as well as anchoring amino/pyridyl groups show higher
power conversion efficiency as compared to porphyrins
with lower number of pyridyl/amino groups.
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Acknowledgments
We sincerely thank Science and Engineering Research
Board (SB/FT/CS-015/2012) and Board of Research
in Nuclear Science (2012/37C/61/BRNS) for financial
support. NC thanks CSIR, India for senior research
fellowship.
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