Mesoscopic perovskite solar cells and modules

In this work we exploit the use of a new promising class of light harvesting materials, namely the hybrid organic halide perovskites (CH₃NH₃PbI_3-xCl_x), for the fabrication of mesoscopic perovskite solar cells and series-connected monolithic perovskite module. To achieve this goal, important innovative procedures were implemented in order to define a reproducible fabrication path applicable also to large area devices. Small area solar cells were fabricated with both Spiro-OMeTAD and the P3HT polymer as Hole Transporting Material (HTM) both showing a Power Conversion Efficiency (PCE) up to 10.5%. First attempts to scale up the size of the cell to a module size shown a PCE of 5.1% on an active area of 13.44cm². In order to improve the efficiency of the module, we developed a new Laser assisted patterning of the perovskite/compact layers together with an optimized perovskite deposition in controlled atmosphere. This allowed us to improve the module PCE up to 7.3% which represent the state of art efficiency for a perovskite module. A promising long-term stability was obtained for the module with Spiro-OMeTAD as HTM. Supporting simulations of Mesoscopic Perovskite Solar Cells were obtained by using the multiscale device simulator TiberCAD.