SnCl4修饰对TiO2纳米阵列微结构及光电性能的影响

Effects of SnCl4 modification on microstructure and photovoltaic properties of TiO2 nanoarrays

TiO2一维纳米阵列具有直接的电子传输通道,在钙钛矿太阳能电池的电子传导方面具有明显优势。采用SnCl4溶液水浴在水热制备的TiO2纳米阵列表面引入SnO2纳米晶粒,详细研究不同浓度SnCl4处理对TiO2纳米阵列微结构和钙钛矿太阳能电池光电性能的影响。研究发现,TiO2纳米阵列表面引入SnO2纳米晶粒,不仅获得了TiO2具有的高电子传导,而且SnO2颗粒的引入增强了钙钛矿中光生电子向电子传导层的注入;同时SnO2纳米晶颗粒的引入有助于填补纳米阵列支架中的缝隙,抑制器件中的载流子复合。TiO2纳米阵列经0.02 mol/L SnCl4溶液处理,基于SnO2纳米晶粒修饰的TiO2纳米阵列组装钙钛矿太阳能电池获得了最佳的光电性能,其光电转换效率达到17.13%。

One-dimensional TiO2 nanoarrays have direct electron transport channels,which has great advantages as electron conduction material in perovskite solar cells.In this paper,SnO2 nanoparticles were successfully introduced onto the surface of hydrothermal-fabricated TiO2 nanorods by water bath treatment of SnCl4 solution.The effects of SnCl4 treatment with different concentrations on microstructure of TiO2 nanoarrays and the corresponding photovoltaic performance of perovskite solar cells were studied.It is found that the introduction of SnO2 nanoparticles on the surface of TiO2 nanoarrays achieves high electron conduction from TiO2 nanoarrays.It also enhances the injection of photogenerated electrons from perovskite into the electron conduction layer.Furthermore,the introduction of SnO2 nanoparticles minimizes the cracks in the TiO2 nanoarrays,which suppresses the recombination of carriers in the cells.When the TiO2 nanoarrays were treated with 0.02 mol/L SnCl4 solution,the assembled perovskite solar cell obtained the optimum photovoltaic performance,and its energy conversion efficiency reached 17.13%.