Environmental Engineering Reference
In-Depth Information
coated on an ITO electrode plate, and then the coated ITO was heated at 450
℃
for 1h to
prepare a transparent Pt-coated ITO. The ITO/TIO
2
/N3/solid (involving organic liquid with
(C
3
H
7
)
4
NI and I
2
) working and the ITO/Pt counter electrodes were put together to fabricate a
dye-sensitized cell. The effective area of the TiO
2
was 0.4 x 0.5 cm (0.20 cm
2
). This cell was
irradiated from the TiO
2
side with a 98 mWcm
-2
visible light from a 500 W xenon lamp using
a Toshiba L-42 and IRA-25S cutoff filters.
The I-V characteristics of the cell is shown in figure 17, and the results are summarized
in table 4 where the performance of the cell composed of the corresponding liquid medium is
also given with the same conditions as the solid type cell.
18
16
14
12
10
8
6
4
2
0
0.0
0.2
0.4
0.6
0.8
Potential /V
Figure 17. I-V curve of the solid-state dye-sensitized solar cell, TiO
2
/N3/Carrageenan solid involving
aceonitrile/3-methyl-2-oxazolidinone (1/1) and (C
3
H
7
)
4
NI/I
2
(0.3 M/0.03 M)/Pt [11]. The data
correspond to Run 4 of table 4.
Table 4. Solid-state dye-sensitized solar cell, TiO
2
/N3/Carrageenan solid involving
aceonitrile/3-methyl-2-oxazolidinone (1/1) and (C
3
H
7
)
4
NI/ I
2
(0.3 M/0.03 M)/
Transparent Pt [11]. Under 98 mW cm
-2
irradiation from a 500 W xenon lamp
Run Electroyte medium J
sc
/mAcm
-2
V
oc
/V
ff
η
/%
1
Liquid
13.75
0.68
0.46
4.39
2
Solid
13.50
0.68
0.51
4.82
3*
Solid
17.50
0.71
0.41
5.22
4**
Solid
16.25
0.72
0.61
7.23
5**
Liquid
13.25
0.76
0.56
5.42
In the table 4 short circuit photocurrent (J
sc
), open circuit photovoltage (V
oc
), Fill Factor
(ff) and light-to-electricity conversion efficiency (η) are given.
In the Run 3 the TiO
2
/dye
electrode was treated with a 2 mol% t-butylpyridine/acetonitrile solution before cell
fabrication in order to suppress back electron transfer from the injected electron in the TiO
2
layer to the oxidized dye. In the Runs 4 and 5 a 0.5 M t-butylpyridine solution was added in
Search WWH ::
Custom Search