Preparation Exploration And Simulation Rerearch Of Perovskite / Crystalline Silicon Tandem Solar Cells

Perovskite/crystalline silicon(c-Si)monolithic tandem solar cells(TSCs)have attracted much attention due to the combination advantages of mature crystalline silicon production technology and excellent photoelectric properties of perovskite materials,and the ability to break through the efficiency of single junction cells.The new thin film preparation technology on textured silicon is quite critical for the experimental development of tandem solar cells,however,existing methods toward the preparation of perovskite deposited on textured silicon surface are technically complicated for perovskite/c-Si monolithic TSCs.In this dissertation,I report a handy solvent engineering of introducing starch additive in MAPb I3-based one-step spin-coating at room temperature.I have investigated the effect of different starch contents in perovskite precursor solution on morphological,structural,optical and photovoltaic properties of the perovskite films.The starch enhances the viscosity of the perovskite precursor solution and established the hydrogen bonds with the CH3NH3+ cation,leading to the formation of almost same perovskite crystal structure films suitable for textured silicon surfaces.It is found that the perovskite film with a starch concentration of 5 wt% realizes full coverage on the textured silicon surface with an average thickness around 600 nm.The perovskite solar cell under this preparation condition has realized the efficiency of 12.33%.Both the perovskite film and corresponding plane solar cell exhibit stable crystal structure and device performance due to the fact that the starch molecules locate at the grain boundaries between perovskite polycrystals and lock the water molecules before they contact with MAPb I3.I have further evaluated the potential of pairing the yielded quasi-conformal nanoscale coverage of perovskite layers with textured silicon surfaces,and demonstrated the uniform light absorption in perovskite layers and good match of the current density in perovskite/c-Si monolithic TSCs,with the best-calculated cell efficiency exceeding 29% by adjusting the structural parameters and the optimization of the material thickness.These results provide new methods for realizing the performance of front textured tandem cells,and can hopefully accelerate the experimental feasibility of the perovskite solution preparation method in highefficiency perovskite/c-Si tandem cells.