Engineering of Perovskite Materials Based on Formamidinium and Cesium Hybridization for High-Efficiency Solar Cells
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Data
2019Autor
Prochowicz, Daniel
Runjhun, Rashmi
Tavakoli, Mohammad Mahdi
Yadav, Pankaj
Saski, Marcin
Alanazi, Anwar Q.
Kubicki, Dominik J.
Kaszkur, Zbigniew
Zakeeruddin, Shaik M.
Lewiński, Janusz
Gratzel, Michael
Metadane
Pokaż pełny rekordStreszczenie
Engineering the chemical composition of
inorganic−organic hybrid perovskite materials is an effective
strategy to boost the performance and operational stability of
perovskite solar cells (PSCs). Among the diverse family of
ABX
3 perovskites, methylammonium-free mixed A-site cation
Cs
xFA1−xPbI3 perovskites appear as attractive light-absorber
materials because of their optimum band gap, superior
optoelectronic property, and good thermal stability. Here,
we develop a simple and very effective one-step solution
method for the preparation of high-quality (Cs)x(FA)1−xPbI3
perovskite films upon the addition of excess CsCl to the
FAPbI
3 precursor solution. It is found that the addition of
CsCl as a source of Cs cation instead of relevant addition of CsI to the parent perovskite solution increases effectively the grain
size and film quality leading to improved charge mobility, reduced carrier recombination, and long carrier lifetime. The resultant
mesoscopic perovskite devices exhibit a maximum efficiency of 20.60% with a stabilized power conversion efficiency of 19.85%
and lower hysteresis compared to the reference device. This performance is among the highest reported for PSC devices
incorporating mixed cation (Cs)x(FA)1−xPbI3 perovskites.
Kolekcje
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