Understanding the precursor chemistry for one-step deposition of mixed cation perovskite solar cells by methylamine route  

作　　者：Manuel Vásquez-Montoya Juan F.Montoya Daniel Ramirez Franklin Jaramillo 

机构地区：[1]Centro de Investigación,Innovación y Desarrollo de Materiales CIDEMAT,Universidad de Antioquia UdeA,Calle 70 No.52-21,Medellín,Colombia

出　　处：《Journal of Energy Chemistry》2021年第6期386-391,I0010,共7页能源化学（英文版）

基　　金：financial support provided by the committee for the development of research(CODI) of the Universidad de Antioquia,in the framework of the project 2017-16000;the financial support of the Colombia Scientific Program within the framework of the call Ecosistema Cientifíco(Contract FP44842-218-2018)。

摘　　要：Upscaling perovskite solar cell fabrication is one of the key challenges in the pathway for commercialization.The slow evaporation of frequently used solvents(DMF or DMSO) limits the fast perovskite layer crystallization,hindering their implementation in large scale deposition methods.Alternatively,methylamine-based precursors have demonstrated rapid crystallization,leading to uniform and specular films.Nonetheless,their application has been limited to MAPbI3 perovskites with limited efficiency and stability.In this work,we report the requirements for stabilizing α-phase of mixed cation perovskites with high amount of formamidinium by using a methylamine-based precursor.We found that even though,there are many methods for incorporating the methylamine(MA) in precursors or films;the MA content determines stabilization of the α-phase and therefore the viscous-solution route is the only method to incorporate high amounts of MA.At low amounts of MA,perovskite tend to crystallize in 1D dimensional FA_(3)(MA)PbI5 phases due to the incomplete solvation of the PbI6-clusters.In contrast,high MA ratio induces a full solvation of the clusters,leading to a rapid crystallization and a full stabilization of the active 3D α-phase.These results open a window in the development and understanding of new precursors for the fabrication of high efficient,stable and scalable perovskite devices.

关 键 词：METHYLAMINE Stabilizingα-phase Mixed cation perovskite precursor Formamidinium Upscaling Perovskite Solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]