Periodic Reporting for period 1 - POSITS (High Performance Wide Bandgap and Stable Perovskite-on-Silicon Tandem Solar Cells)
Berichtszeitraum: 2017-06-01 bis 2019-05-31
• The review of various perovskite materials that could potentially improve on stability and reduce photoinduced halide phase segregation.
• The access to optical data, including complex refractive indices of CsxFA1-xPbI3-yBry perovskites with optical bandgaps from 1.5 to 1.8 eV, for researchers working on modelling/simulations.
• The demonstration that lead-halide perovskites can have strong intolerance to certain impurities such as Bismuth.
• Temperature dependent PL of perovskites and the freezing out of halide migration at low temperatures showing that it is a diffusion related process.
• The modelling of diffusion mechanisms related to the photoinduced halide phase segregation effect.
• High photoluminescence quantum yield as measured by absolute photoluminescence can be reached for bare planar perovskite films on fused silica glass.
• The use of the 2-step hybrid deposition technique to deposit conformal perovskite film on top of textured silicon solar cells.
• The importance of using textured rather than flat silicon bottom cells due to the gain in short-circuit current. This is where we believe the perovskite/Si field should move towards in the future.