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Title:
 
Growth of MAPbI3 Films with Improved Stability: A Comparative Study
 
Author(s):
 
G. Gordillo, O.G. Torres, M.C. Abella, J.C. Peña, O. Virguez
 
Topic:
 
Perovskites and Other Non-Silicon Materials, MJs and Tandems
Subtopic: Perovskites
Event: 37th European Photovoltaic Solar Energy Conference and Exhibition
Session: 3BV.1.7
 
Pages:
 
645 - 648
ISBN: 3-936338-73-6
Paper DOI: 10.4229/EUPVSEC20202020-3BV.1.7
 
Price:
 
 
0,00 EUR
 
Document(s): paper
 

Abstract/Summary:


This paper reports results of a study on the impact that the synthesis method and the replacement of the methylammonium (MA) cation by the formamidinium (FA) cation have on the degradation of MAPbI3 films when these are exposed to environmental conditions. This study was conducted with samples deposited using different routes based on growth methods both in solution and thermal evaporation, such as spin coating in one step and two-step growth routes that include dipping in a solution of methylammonioum iodide (MAI) of a coated glass substrate with a layer of PbI2 previously deposited by evaporation and a third novel route which includes sequential deposition of layers of PbI2 and MAI by conventional evaporation and by CSS (close spaced sublimation) respectively. All the synthesis methods we have used, allowed growing thin films of MAPbI3 free of secondary phases with perovskita type tetragonal structure; however, the study revealed that both the growth route and the incorporation of FA into the MAPBI3 lattice significantly affects the stability of the samples when these are exposed to the environment. Improved stability was achieved using two-stage growth methods.