I am trying to coat the standard triple-cation perovskite on top of PTAA using the anti-solvent technique. However, in order to get consistent films, I wanted to use an electronic pipette for dispensing the anti-solvent to control the speed of anti-solvent. When I dripped the anti-solvent the Perovskite film appeared to be full of cracks. I tried to change the amount of anti-solvent (from 90ul to 200ul ) but still, the problem persists. I tried different anti-solvents like CB, Anisole, and Ethyl acetate. In all the cases I see the consistent result. I coated the perovskite with a normal pipette and there are very little cracks. I don't understand what might be the issue.
Dear Sathy HarshaVardhan Reddy
I think your solution becomes non-homogeneous when you drip the anti solvent.
You have to modify your method such that a homogeneous solvent results. This can be accomplished by using ultrasound agitation or or you can sprayer and ultrasound agitation. This is my proposal if the it succeed please inform us.
Best wishes
Dear Sathy HarshaVardhan Reddy
I think your solution becomes non-homogeneous when you drip the anti solvent.
You have to modify your method such that a homogeneous solvent results. This can be accomplished by using ultrasound agitation or or you can sprayer and ultrasound agitation. This is my proposal if the it succeed please inform us.
Best wishes
It is a very interesting issue if you are facing the problem for only electronic pipette. I also use CB as Antisolvent and never face any such problem. Change the time of Antisolvent dipping preferably at the last 10 the second ( time of gelation)
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