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An Interdiffusion Method for Highly Performing Cesium/Formamidinium Double Cation Perovskites
Author(s) -
Qiu Weiming,
Ray Aniruddha,
Jaysankar Manoj,
Merckx Tamara,
Bastos Joao P.,
Cheyns David,
Gehlhaar Robert,
Poortmans Jef,
Heremans Paul
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201700920
Subject(s) - formamidinium , perovskite (structure) , caesium , materials science , energy conversion efficiency , annealing (glass) , perovskite solar cell , bromide , inorganic chemistry , crystallography , chemistry , optoelectronics , composite material
The fabrication of high‐quality cesium (Cs)/formamidinium (FA) double‐cation perovskite films through a two‐step interdiffusion method is reported. Cs x FA 1‐ x PbI 3‐y(1‐ x ) Br y(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 cm 2 ) with an aperture PCE of 16.4%, using the Cs/FA double cation perovskite made with 10 mol% CsI and 15 mol% FABr (Cs 0.1 FA 0.9 PbI 2.865 Br 0.135 ) 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).