Abstract In the last decade, inorganic–organic hybrid perovskites have demonstrated a dramatic increase in photoconversion efficiency by engineering the perovskite composition, as well as adjusting the properties of the charge transporting materials. The nucleation and growth of the perovskite layer are governed by the surface properties of the substrate and depend on its wetting properties defined by the roughness and the species adsorbed. Fixing all fabrication conditions of a PSC but only changing the wettability of the substrate is practically difficult because varying the surface hydrophilicity can contribute side effects such as chemical identity change or adsorption of new species on the surface. Herein, we studied a double-layered TiO2/SnO2 ETL for perovskite deposition and we changed the hydrophilicity of the samples using hydrophobic recovery after UV exposure. Thus, the effect of wettability of the substrate on nucleation and growth of the perovskite layer was elucidated under minimized interference. It was found that the influence of the wetting properties of the substrate on the growth of perovskite can be exaggerated in the literature since the increase in the grain size of the perovskite layer is just 14% bigger if the water contact angle of the substrate increases from 3° to 72°.

中文翻译：

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基底润湿性对金属卤化物钙钛矿生长的影响

摘要 在过去的十年中，无机 - 有机杂化钙钛矿通过设计钙钛矿成分以及调整电荷传输材料的性质，证明了光转换效率的显着提高。钙钛矿层的成核和生长受基材的表面特性控制，并取决于其由粗糙度和吸附物质定义的润湿特性。修复 PSC 的所有制造条件但仅改变基材的润湿性实际上是困难的，因为改变表面亲水性会导致副作用，例如化学特性变化或表面吸附新物种。在此处，我们研究了用于钙钛矿沉积的双层 TiO2/SnO2 ETL，我们使用紫外线照射后的疏水恢复来改变样品的亲水性。因此，在最小化干扰下阐明了基底润湿性对钙钛矿层成核和生长的影响。研究发现，基底的润湿性对钙钛矿生长的影响在文献中被夸大了，因为如果基底的水接触角增加，钙钛矿层的晶粒尺寸增加仅 14% 3° 到 72°。