Fig. 2From: Effects of Process Parameters on the Characteristics of Mixed-Halide Perovskite Solar Cells Fabricated by One-Step and Two-Step Sequential CoatingEffect of spin velocity: laser images of spin-dip perovskites. The PbCl2 films spun at a 1000 rpm (run 4), b 4000 rpm (run 5), and c 7000 rpm (run 3). All other process parameters were kept constant. The field of view is 65 μm × 65 μmBack to article page