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Nucleation behavior of organic-inorganic lead halide perovskite under solution fabrication process

李燕  丁斌  楚倩倩  周勇  杨冠军  
【摘要】:Nucleation site is one of the critical factors to get the full coverage perovskite film in both macroscopic and microscopic scale. To realize the full coverage state of both scales,the nucleation site of perovskite precursor solution is systematically investigated. The results show that under natural drying condition, then dendritic perovskite is formed by both heterogeneous nucleation and homogeneous nucleation. To explain this, the concentration filed and temperature field of the precursor solution has been established,and the comprehensive analysis results show that there are two preferred nucleation sites,i.e., the upper surface of the precursor solution and the surface of the substrate. The solvent evaporation at the upper surface and the thermal transmission as well as solute diffusion are competitive relation to final nucleation site. Through controlling the upper influence factors by low pressure method, the bilayer perovskite film and monolayer perovskite film were prepared. The photovoltaic performance of the perovskite solar cells with monolayer perovskite film is slightly higher than perovskite solar cells with bilayer perovskite film,which may be attributed to the good perovskite film/substrate contact and extending exciton lifetime.

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