%0 Journal Article
%A Hoque, Md Nadim
Ferdous
%A He, Rui
%A Warzywoda, Juliusz
%A Fan, Zhaoyang
%D 2018
%T Effects of Moisture-Based
Grain Boundary Passivation
on Cell Performance and Ionic Migration in Organic–Inorganic
Halide Perovskite Solar Cells
%U https://acs.figshare.com/articles/journal_contribution/Effects_of_Moisture-Based_Grain_Boundary_Passivation_on_Cell_Performance_and_Ionic_Migration_in_Organic_Inorganic_Halide_Perovskite_Solar_Cells/7022051
%R 10.1021/acsami.8b08981.s001
%2 https://acs.figshare.com/ndownloader/files/12904676
%K charge transport mapping
%K ion migration
%K PSC device performance
%K charge carrier screening
%K PbI 2 passivation
%K PbI 2
%K Moisture-Based Grain Boundary Passivation
%K Different GB passivation methods
%K MAPbI 3
%K charge collection efficiency
%K scanning Kelvin probe microscopy
%X Because of the polycrystalline
nature, grain boundaries (GBs) in
hybrid perovskite thin films play critical roles in determining the
charge collection efficiency of perovskite solar cells (PSCs), material
stability, and in particular the ion migration, considering their
relatively soft ionic bonds with low formation energy. Different GB
passivation methods are being studied, and introducing PbI2-rich phase at GBs in methylammonium lead iodide (MAPbI3) has been found to be useful. In this study, combining macroscale
measurements with tip-based microscopic probing that includes scanning
Kelvin probe microscopy for surface potential mapping and conductive
atomic force microscopy for charge transport mapping, we revealed
the effects of PbI2-rich phase at GBs, which was introduced
in moisture-assisted synthesis of MAPbI3 thin films. It
was found that PbI2 passivation of GBs could change the
surface potential and charge carrier screening and significantly retard
current conduction at the GB while enhancing conduction through the
grain interior. Inhibition of ion migration at GBs, as well as enhanced
PSC device performance, is reported.
%I ACS Publications