Jancik Prochazkova Anna, Scharber Markus Clark, Yumusak Cigdem, Jančík Ján, Másilko Jiří, Brüggemann Oliver, Weiter Martin, Sariciftci Niyazi Serdar, Krajcovic Jozef, Salinas Yolanda, Kovalenko Alexander
Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University Linz, Altenberger Straße 69, 4040, Linz, Austria.
Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 61200, Brno, Czech Republic.
Sci Rep. 2020 Sep 24;10(1):15720. doi: 10.1038/s41598-020-72826-6.
This work reports on an optimized procedure to synthesize methylammonium bromide perovskite nanoparticles. The ligand-assisted precipitation synthetic pathway for preparing nanoparticles is a cost-effective and promising method due to its ease of scalability, affordable equipment requirements and convenient operational temperatures. Nevertheless, there are several parameters that influence the resulting optical properties of the final nanomaterials. Here, the influence of the choice of solvent system, capping agents, temperature during precipitation and ratios of precursor chemicals is described, among other factors. Moreover, the colloidal stability and stability of the precursor solution is studied. All of the above-mentioned parameters were observed to strongly affect the resulting optical properties of the colloidal solutions. Various solvents, dispersion media, and selection of capping agents affected the formation of the perovskite structure, and thus qualitative and quantitative optimization of the synthetic procedure conditions resulted in nanoparticles of different dimensions and optical properties. The emission maxima of the nanoparticles were in the 508-519 nm range due to quantum confinement, as confirmed by transmission electron microscopy. This detailed study allows the selection of the best optimal conditions when using the ligand-assisted precipitation method as a powerful tool to fine-tune nanostructured perovskite features targeted for specific applications.
这项工作报道了一种合成甲基溴化铵钙钛矿纳米颗粒的优化方法。通过配体辅助沉淀合成途径制备纳米颗粒是一种经济高效且有前景的方法，因为它易于扩大规模、设备要求成本低且操作温度适宜。然而，有几个参数会影响最终纳米材料的光学性能。本文描述了溶剂体系的选择、封端剂、沉淀过程中的温度以及前驱体化学物质的比例等因素的影响。此外，还研究了前驱体溶液的胶体稳定性和稳定性。观察到上述所有参数都会强烈影响胶体溶液的光学性能。各种溶剂、分散介质和封端剂的选择会影响钙钛矿结构的形成，因此对合成过程条件进行定性和定量优化会得到不同尺寸和光学性能的纳米颗粒。如透射电子显微镜所证实的，由于量子限制，纳米颗粒的发射最大值在508 - 519纳米范围内。这项详细研究使得在将配体辅助沉淀法作为微调针对特定应用的纳米结构钙钛矿特性的有力工具时，能够选择最佳的优化条件。
