Video: How to Prepare Perovskite Films via Air Processing
This video shows how to prepare a perovskite film while processing in air.
The perovskite precursor ink used was our I101, which is comprised of PbCl2 and MAI at a molar ratio of 1:3 (respectively) in dimethylformamide (DMF). It has been found to be important for the perovskite precursor ink to be processed in air at a humidity in the range of 30-40% rh. Having a processing environment with a higher humidity has a significant affect on the film formation and the resultant perovskite film. See our humidity video for additional information.
The process requires the perovskite precursor solution to be heated to 70°C while the substrates are maintained at a temperature of 90°C. Once the hot solution is spin cast onto the heated substrate, the substrate should be placed on a 90°C hotplate for 90-120 minutes to allow the perovskite film to fully form.
- Spin coat precursor ink on to ITO/PEDOT:PSS.
- Perovskite precursor films should look bright yellow.
- Using a dry cotton bud, wipe the precursor film off the sides of the substrate.
- Films should now be annealed at 90°C for 90 minutes.
- The films will gradually darken as the precursor is converted to the mixed halide perovskite.