Hello Researchers
I am inkjet-printing water-based Ag ink on top of PPDE2FBT:PCBM ( blend ) thin film. Where the bottom layer is ITO. The thickness of the polymer film is about 200nm. After printing Ag, it was annealed at 145C for 20min. Unfortunately, the Ag layer is short-circuited with the bottom layer, that is not desirable. Could please let me know how can I overcome this issue.
Thanks in advance.
--Chandan
Dear Chandan Howlader,
Firstly do have any layer coated on the top of ITO such as PEDOT:PSS layer? Some ITO substrates have spike island which mean their roughness normally high.
Secondly water based Ag ink may not be a good option to easily oxidize Ag. A solvent based silver ink could be a better option.
Dear Xuhua Wang
Thank you for the suggestion. I tried both ways. the layer structure was ITO/PPDT2FBT:PCBM/Ag, ITO/ZnO/PPDT2FBT:PCBM/Ag, ITO/ZnO/PPDT2FBT:PCBM/WO3/Ag. Each case, it was short-circuited.
It is likely that the two electrodes have some contact directly due the device layout problem.
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