摘要
Well-aligned single-crystal nanowire arrays of CH3NH3PbIs have shown potentials in laser sources and photovoltaic applications.Here we developed a solution based epitaxial method to grow CH3NH3PbI3nanowire arrays.By confining the precursor solution between a silicon wafer and ST-cut quartz,the evaporation rate of the solvent was slowed down which brings a more stable and controllable solution environment.Relying on the lattice match between CH3NH3PbI3 and ST-cut quartz,arrays of single-crystal nanowires of CH3NH3PbI3have been grown epitaxially.The densities and lengths of CH3NH3PbI3 nanowires can be tuned. The lengths of the resultant crystals range from several microns to over one millimeter.Such CH3NH3PbI3arrays with good alignment and crystallinity were then applied to fabricate photovoltaic devices with good performances.
有序单晶CH_3NH_3PbI_3钙钛矿纳米线阵列在激光和光电领域具有良好的应用前景.溶液法被认为是一种简便、高效且成本低廉的方法并被用于构建钙钛矿晶体材料.本文介绍了一种限域外延生长方法并将其用于构建有序单晶CH_3NH_3PbI_3钙钛矿纳米线阵列.通过将钙钛矿材料的前驱体溶液限制在由硅片和ST-cut的石英构成的反应腔中,溶液挥发行为受到限制,进而为晶体生长提供了更加稳定可控的环境.由于CH_3NH_3PbI_3和ST-cut石英之间存在晶格匹配,可以在石英表面获得密集的单晶钙钛矿纳米线阵列.通过调节反应腔尺寸,可以进一步调控钙钛矿纳米线的长度,获得长度为由微米尺寸到亚厘米尺寸不等的阵列. CH_3NH_3PbI_3钙钛矿阵列进一步被用于光电器件的构建并获得了较好的性能.
基金
supported by the National Natural Science Foundation of China (21631002, U1632119, 21621061, and 91633301)
Ministry of Science and Technology of the People’s Republic of China (2016YFA0201904)
