Structural and optical properties of lead iodide deposited by rf sputtering |
José Silva Filho1, Nelson Borrero1, Andreia Morais1, Jilian Freitas2, Tárcio Barros1, Francisco Marques1 1University of Campinas, Campinas, --, Brazil /2Center for Information Technology Renato Archer, Campinas, --, Brazil |
PbI2 was deposited by sputtering from a PbI2 target and deposited at different temperatures, ranging from room temperature to 150 ºC. PbI2 films were converted to perovskite by immersion in a MAI solution. X-ray measurements revealed that the PbI2 films contain a small concentration of segregated metallic lead (Pb), which was converted to lead iodide by the iodination process. It was also observed that the immersion of the PbI2 film in the MAI solution also converts the segregated Pb into perovskite. The optical and structural properties of the films were investigated using UV-Vis spectroscopy, XRD, Raman, AFM and SEM spectroscopy. A preliminary study of manufacturing solar cells provided devices with efficiency of 3.70% with great potential for improvement through the adoption of optimized parameters for deposition and manufacture of devices in an inert atmosphere. The use of the sputtering technique allows the deposition of uniform films over large areas, being compatible with roll-to-roll processes, which are desired for the production of perovskite solar panels. |