Kim Beom-Soo, Gil-Escrig Lidón, Sessolo Michele, Bolink Henk J
Instituto de Ciencia Molecular, Universidad de Valencia, Calle Catedrático Jose Beltrán 2, Paterna 46980, Spain.
J Phys Chem Lett. 2020 Aug 20;11(16):6852-6859. doi: 10.1021/acs.jpclett.0c01995. Epub 2020 Aug 9.
Halide perovskites have generated considerable research interest due to their excellent optoelectronic properties in the past decade. To ensure the formation of high-quality semiconductors, the deposition process for the perovskite film is a critical issue. Vacuum-based processing is considered to be a promising method, allowing, in principle, for uniform deposition on a large area. One of the benefits of vacuum processing is the control over the film composition through the use of quartz crystal microbalances (QCMs) that monitor the rates of the components in situ. In metal halide perovskites, however, one frequently employed component or precursor, CHNHI, exhibits nonstandard sublimation properties. Here, we study in detail the sublimation properties of CHNHI and demonstrate that by correcting for its complex adsorption properties and by modeling the film growth, accurate predictions of the stoichiometry of the final perovskite film can be obtained.
在过去十年中，卤化物钙钛矿因其优异的光电性能而引起了广泛的研究兴趣。为了确保高质量半导体的形成，钙钛矿薄膜的沉积过程是一个关键问题。基于真空的处理方法被认为是一种很有前途的方法，原则上可以在大面积上实现均匀沉积。真空处理的一个优点是可以通过使用石英晶体微天平（QCM）来控制薄膜成分，QCM可以原位监测各组分的速率。然而，在金属卤化物钙钛矿中，一种常用的组分或前驱体CHNHI表现出非标准的升华特性。在这里，我们详细研究了CHNHI的升华特性，并证明通过校正其复杂的吸附特性并对薄膜生长进行建模，可以获得最终钙钛矿薄膜化学计量比的准确预测。
