The = JscVocFF/Pin, where Pin is the intensity of

The photocurrent density – voltage
(J-V) characteristics study was carried out under one sun illumination (AM 1.5
G, 100 mW/cm2) for the Au:TiO2 and pure TiO2 based
DSSCs. Figure 3.8 shows the typical curves of current density versus voltage
for pure TiO2 and Au:TiO2 based DSSCs. The parameters,
such as short-circuit current density (Jsc), the open circuit
voltage (Voc), the fill factor (FF) and the overall power conversion
efficiency (PCE) are listed in Table 3.2. The efficiency is calculated using
relation,h
= JscVocFF/Pin, where Pin is the
intensity of incident light (100 mW/cm2). The Au:TiO2
based DSSC exhibits a maximum PCE of 8.6% which is increased by about65%
compared to that of 5.2% for pure TiO2 DSSC. The short circuit photocurrent
density (Jsc) of Au:TiO2 was 15.88 mA/cm2,
which is increased by70% compared to the 9.29 mA/cm2 for pure TiO2
electrode. The increase in value of Jscfor Au:TiO2based
DSSC compared to that of pure TiO2 based DSSC is attributed to the
enhanced light absorption of the dye (shown in Figure 3.5c) resulting from the
SPR of AuNPs, which would have stimulated the dye to generate more charge
carriers. Furthermore, the Schottky barrier formed at the Au:TiO2
interface develops electron-hole trapcentres. This could be favourable for the free
movement of photo generated electrons diffusing through the TiO2
matrix for a longer period which reduce the recombination rate thus increasing
Jsc(Guo
et al., 2013).The addition of Au nanoparticles seems to change the Fermi
energy level. In case of Au:TiO2 the difference between the Fermi
energy level of photoande and Nernst potential of the 

  redox system is small compared to that for
pure TiO2. As the open circuit voltage is directly proportional to,
this difference, Vocissmaller for Au:TiO2system rather
than pure TiO2system (Du et al., 2012; Lim et
al., 2015).The photovoltaic performance of our
Au:TiO2 nanocomposite based DSSC is compared with that of the
previously reported Au:TiO2nanocomposite based DSSCs, and their
photovoltaic parameters are summarized in Table 3.3. Our results are
comparatively good with the best results available in the literature.

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