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Perovskite thin film preparation

LL Luis Lanzetta
TW Thomas Webb
NZ Nourdine Zibouche
XL Xinxing Liang
DD Dong Ding
GM Ganghong Min
RW Robert J. E. Westbrook
BG Benedetta Gaggio
TM Thomas J. Macdonald
MI M. Saiful Islam
SH Saif A. Haque
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Under an inert atmosphere, a 4:1 v/v mixture of DMF and DMSO (both ultradry and bottled with molecular sieves) were filtered with 0.2 µm PTFE filters. Next, PEAI (GreatCell Solar), FAI (GreatCell Solar), SnI2 and SnF2 (99%) powders are weighed in a 0.2:0.8:1:0.1 molar ratio, respectively, to obtain 500 µL of a 0.8 M (PEA)0.2(FA)0.8SnI3 perovskite precursor solution by heating and stirring at 70 °C for 1 h. The solutions were then filtered (0.2 µm, PTFE) and deposited on the chosen substrate via a two-step spin-coating procedure (1: 1000 rpm/10 s; 2: 5000 rpm/30 s, 800 µL of ultradry toluene are dropped in the middle of the substrate after 12 s), followed by 70 °C annealing for 20 min.

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