Solution Processing Procedure
Typical processing solvents: Methanol, ethanol
Typical suggested concentration: 1.0 mg/ml or 1.0 mM
Typical processing procedure: RS-2 solution (1.0 mg/ml) in anhydrous ethanol is spin-coated onto ITO surface for 30 s at the speed of 3000 rpm in a nitrogen filled glovebox, followed by annealing for 10 min at 100 ℃ on a hotplate. The substrate is cooled down to room temperature and then dynamic cleaned by 100 μL EtOH at 3000 rpm. Then the substrate is annealed at 100 °C for another 5 min (from normal bandgap PSCs fabrication DOI: 10.1126/science.adv4551).