Environmental Engineering Reference
In-Depth Information
Fig. 26 The coating quality images of the blade-coated layers versus spin-coated layer. The
circles indicate the voids on the P3HT:PC
61
BM layer. The images were captured with X5
magnification rate
Table 10
The device performances of the blade-coated device and spin-coated device
Jsc (A/cm
2
)
Rs (X cm
2
)
p(X cm
2
)
Voc (V)
FF (%)
PCE (%)
Blade, 6 cm
2
10.66
0.58
38.94
2.41
22.87
181.56
Spin, 6 cm
2
11.21
0.50
35.27
1.98
22.17
95.06
good coat-ability on the hydrophobic polymer active layer. Moreover, the Ag
nanoparticle ink should not affect the underlying layers during the coating process.
Unfortunately, because the PEDOT:PSS is water-based polymer solution, it is
unable to be coated on the polymer active layer. In addition, the Ag nanoparticle
ink is easy to infiltrate and contaminate the underlying layer. To avoid these
problems, we used nonconventional methods such as lamination or transfer
technique to make the OPVs: the two layers will be coated on a separate substrate
at first, and then the dried layers will be transferred to be laminated on the surface
of the polymer active layer. After lamination, the contact between the two parts
such as PEDOT:PSS and active polymer layer are not perfect. Thus, thermal
annealing can improve the contact between the layers.
2.5.5 All-Solution Processed Lamination Technique
As a proof-of-concept experiment, the ITO-PET and ITO-glass were used to verify
the feasibility of the lamination technique as an alternative process. The brief
fabrication process is as follow (Fig.
27
). The ZnO nanoparticle solution was
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