Starting materials: FAI, PbI2, N,N-dimethylformamide (DMF)
Product: FAPbI3 film
Description: FAI and PbI2 were dissolved in anhydrous DMF in a 1:1 molar ratio, at 0.88M. 60µl of hydroiodic acid (57%w/w) was added to 1ml of the solution. The FAPbI3 precursor was diluted down to 0.55M with DMF. The precursor solution was spin-coated and annealed on glass in a nitrogen-filled glovebox at 170°C for 25 minutes.
Method: optical absorption
Description: Transmittance and reflectance spectra were collected with a Varian Cary 300 UV-Vis spectrophotometer with an internally coupled integrating sphere.