I am working on Perovskite solar cells, I am preparing solar cell with planer structure like ITO/SnO2 or c,m-TiO2/ Active layer/ HTL (Spiro in CB or PTAA in Toluene)/ Ag. But as soon as I add HTL solution my perovskite layers start to degrade and just wash away.
So far I have tried to add minum amount of HTL solution, spinning at high and low speed.
What could be the reasons behind this issue or what could be the other possible solution can I try?
For perovskites I am working on MAPbI3, FAPbBr3, and some bismuth based materials, but problem is persistant. Even when I try inverted structure PCBM and BCP solutions are also destroying my actve layers.
There are several possible reasons why your perovskite layers are degrading when you add the HTL solution. Some of the reasons could be:
You could also try using different processing techniques such as blade coating, spray coating, or inkjet printing, to see if they offer better compatibility with the HTL solution. Additionally, you could try using a different HTL material or a different interface layer between the perovskite layer and the HTL.
Memoona Qammar
What are the parameters you are using for spin coating HTL?
Is the HTL deposited dynamically?
What is the concentration of HTM?
1- Control the annealing condition of the perovskite layer.
2- Usual concentration of HTL (Spiro OMeTAD) is 73.2mg/ml C.B.
3- 4000 RPM/30s
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