Environmental Engineering Reference
In-Depth Information
Table 13 Device characteristics of solar cells fabricated by transparent metal mesh of (a)
P3HT:PCBM BHJ inverted cell
P3HT:PCBM
Jsc (mA/cm
2
)
Rs (X cm
2
)
Rsh (X cm
2
)
Voc (V)
FF (%)
PCE (%)
Al TME/PH500
7.90
0.63
52.46
2.62
19.52
3588.17
Al TME/PH1000
8.20
0.63
56.22
2.89
11.85
767.65
Ag TME/PH500
9.01
0.64
61.57
3.53
6.29
1932.42
Table 14 Device characteristics of solar cells fabricated by transparent metal mesh of PIDT-
phanQ:PC71BM BHJ inverted cell
PIDT-phanQ:PC
71
BM
Jsc (mA/cm
2
)
Rs (X cm
2
)
Rsh (X cm
2
)
Voc (V)
FF (%)
PCE (%)
ITO/PH500
8.53
0.87
59.62
4.41
5.95
1320.41
Al TME/PH500
9.66
0.88
46.90
3.99
32.10
591.74
Ag TME/PH500
10.54
0.88
61.49
5.68
4.14
1927.38
Al TME and ITO electrode. One of the reasons is that Ag TME with PH500 show
the lowest R
S
. Once again these results show the importance of R
S
in determining
the OPV overall efficiency.
3 Conclusions and Discussion
This chapter described various coating methods that can be used for large area
PLED and OPVs. The coating mechanisms and instability issues in practical
solution process have been examined. Using the various coating process such as
roll-to-roll coating, blade coating, blade-slit coating, and spin coating, the coating
performance was compared in terms of the film uniformity and controlling the
coating instabilities. The blade and roll-to-roll coating are more favorable for the
large-scale device in terms of the device performance and the manufacturing cost.
Metal mesh structures in combination with conductive polymers was introduced as
the ITO-free transparent electrode. Finally, nonconventional process such as
lamination and transfer techniques was used to improve the shunt resistance and
the series resistance in the large-scale and vacuum-free processed devices. How-
ever, several other issues remained to be overcome such as the lifetime stability
and environmentally friendly solvents, and materials costs for the realization
toward $1/W OPVs. The polymer electronics are growing fields, more research
efforts are needed to improve the device performance, lifetime, process-ability,
and large area manufacturing, which will bring the bright future of the polymer
electronics to reality.
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