SPLTRAK Abstract Submission
Performance and stability of electrodeposited mixed perovskites MAPbI3-xClx and MA1-yFAyPbI3-xBrx
Mirella Al Katrib, Emilie Planes, Lara Perrin
Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP, LEPMI, Grenoble, France

Electrodeposition was investigated in this work as a substitute method to develop large area perovskite active layer for solar device application. This method is easy to manipulate, and the electrodeposited films could grow on surfaces as large as desired, inside an electrolyte, allowing its application in ambient atmosphere, with no need of a glove box. Along with the simple MAPbI3 perovskite, the deposition of mixed MAPbI3-xClx and  MA1-yFAyPbI3-xBrx perovskites was studied, while variating the Cl and the Br proportion in the developed active material. This successful attempt is one of its kind, since these mixed perovskites were never developed using electrodeposition before. It was noticed that according to the Cl or the FA and Br ratios infiltrated in the perovskite lattice, different microstructures, optical and chemical properties are obtained. This difference impacts the photovoltaic activity of the perovskite layer when applied is a photovoltaic cell. The electrodeposited mixed perovskites offer a PCE enhancement comparing to simple MAPbI3, and are subject to maturation when aged in specific conditions, with a PCE improvement reaching 60% for the chlorine doped perovskites after 500 h of ageing under vacuum at 40°C, and 35% for the MA1-yFAyPbI3-xBrx perovskites after 350 h, before the degradation starts. The obtained stability is impressive, since the developed solar devices are not encapsulated, and such ageing usually leads to a direct degradation and decrease in the photovoltaic performance under such conditions.