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Prepared solutions
(1)460mg/ml   PbI2/DMF    2ml   spin-coating   3000 rpm for 15s
(2)10mg/ml    MAI/IPA     5ml   (When doing experiment, you can put MAI/IPA solution in a small beaker)

Method
A PbI2 solution is spin coated on cleaned Glass.After drying for several minutes in air, the substrate is dipped into a solution of  MAI/IPA (10mg/ml) for 40s, then dried under a flow of clean air.

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