Environmental Engineering Reference
In-Depth Information
Fig. 17 a J-V characteristic of two different TiO
2
inverse opal electrodes made from latex
template with diameters of 309 and 394 nm [
146
]; b Photocurrent density-photovoltage
characteristics of CdSe QD-sensitized inverse opal TiO
2
solar cells with different adsorption
times [
145
]; c Photocurrent density-photovoltage characteristics of CdSe QD-sensitized inverse
opal TiO
2
and nanoparticulate TiO
2
solar cells with the same electrode thickness [
145
]; d Time
dependence of the TG signal intensity of CdSe QD-sensitized inverse opal (IO) and
nanoparticulate (NP) TiO
2
solar cells [
145
] (Reprint permission from IOP publishers, [
146
]
and RSC Publishers [
145
])
electrodes made from latex template with diameters of 309 and 394 nm was tested
(Fig.
17
a). The wide pore size of opal 394 nm results slightly higher efficiency
2.7 % than the smaller pore size opal-based cell (2.4 %) [
146
]. Further, Toyoda
et al. explored how the wide pore nature of IO supports the efficient QDs coating
[
145
]. Figure
17
b shows the JV performance of IO-based QDSSCs with different
amount of QDs loading. From Fig.
17
b it clearly understands that 8 h chemical
bath deposited CdSe QDs coating performed higher than that of 4 h QDs coating.
The former QDs coating result 3.1 % of PCE with J
sc
= 8.3 mA cm
-2
,
V
oc
= 0.69 V and FF = 0.57. In the case of later one (4 h CdSe QD coating)
results 2.8 % of PCE with J
sc
= 8.2 mA cm
-2
, V
oc
= 0.68 V and FF = 0.54.
Further enhancing the QDs deposition to 24 h, the PCE was found to be reduced to
1.0 % (J
sc
= 3.1 mA cm
-2
, V
oc
= 0.61 V and FF = 0.55) due to pore blockage,
which severely affect the electrolyte penetration. Thus, result poor hole scavenging
at QDs/IO interfaces, and lower the V
oc
and J
sc
[
145
]. In order to understand the
feasibility of IO electrode in QDSCs, the typical PV performance of IO is com-
pared with NP electrode in Fig.
17
c. Both IO and NP electrode thickness is about
9 lm. The IO-based QDSSC showed a higher efficiency (3.5 %) than that of the
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