Figure 1. Schematic illustration of the deposition via an anti-solvent soaked applicator (DASSA) method. A) The PET/ITO/SnO2 substrate with two parallel segments made of tape at the edges (the substrate is placed on a hot plate); B) spreading of the perovskite precursor on PET/ITO/SnO2 substrate; C) soaking of the piece of paper applicator in antisolvent; D) drawing of the paper applicator over the perovskite precursor solution and tape separators from one side of the substrate to the other; E) photograph of application of antisolvent on the piece of paper; F) photograph of soaking the piece of paper applicator in Antisolven and the DASSA method in which the piece of paper previously soaked in anti-solvent is drawn over the substrate, with the brown-coloured perovskite film being formed at the trailing edge of the applicator. Credit: Tor Vergata University of Rome - Centre for Hybrid and Organic Solar Energy (CHOSE)