An Interdiffusion Method for Highly Performing Cesium/Formamidinium Double Cation Perovskites |
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| Authors: | Weiming Qiu Aniruddha Ray Manoj Jaysankar Tamara Merckx Joao P Bastos David Cheyns Robert Gehlhaar Jef Poortmans Paul Heremans |
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| Affiliation: | 1. IMEC, Heverlee, Belgium;2. Department of Materials Engineering (MTM), KU Leuven, Heverlee, Belgium;3. Department of Electrical Engineering (ESAT), KU Leuven, Heverlee, Belgium |
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| Abstract: | The fabrication of high‐quality cesium (Cs)/formamidinium (FA) double‐cation perovskite films through a two‐step interdiffusion method is reported. Csx FA1‐x PbI3‐y(1‐x )Bry(1‐x ) films with different compositions are achieved by controlling the amount of CsI and formamidinium bromide (FABr) in the respective precursor solutions. The effects of incorporating Cs+ and Br? on the properties of the resulting perovskite films and on the performance of the corresponding perovskite solar cells are systematically studied. Small area perovskite solar cells with a power conversion efficiency (PCE) of 19.3% and a perovskite module (4 cm2) with an aperture PCE of 16.4%, using the Cs/FA double cation perovskite made with 10 mol% CsI and 15 mol% FABr (Cs0.1FA0.9PbI2.865Br0.135) are achieved. The Cs/FA double cation perovskites show negligible degradation after annealing at 85 °C for 336 h, outperforming the perovskite materials containing methylammonium (MA). |
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| Keywords: | cesium/formamidinium high efficiency perovskite solar cells stability two‐step deposition |
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