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@ARTICLE{OchoaMartinez:904109,
author = {Ochoa-Martinez, Efrain and Ochoa, Mario and Ortuso, Roberto
D. and Ferdowsi, Parnian and Carron, Romain and Tiwari,
Ayodhya N. and Steiner, Ullrich and Saliba, Michael},
title = {{P}hysical {P}assivation of {G}rain {B}oundaries and
{D}efects in {P}erovskite {S}olar {C}ells by an {I}solating
{T}hin {P}olymer},
journal = {ACS energy letters},
volume = {6},
number = {7},
issn = {2380-8195},
address = {Washington, DC},
publisher = {American Chemical Society},
reportid = {FZJ-2021-05679},
pages = {2626 - 2634},
year = {2021},
abstract = {Passivation and interlayer engineering are important
approaches to increase the efficiency and stability of
perovskite solar cells. Thin insulating dielectric films at
the interface between the perovskite and the charge carrier
transport layers have been suggested to passivate surface
defects. Here, we analyze the effect of depositing
poly(methyl methacrylate) (PMMA) from a very
low-concentration solution. Spatial- and time-resolved
photoluminescence and atomic force microscopy analyses of
samples with diverse morphologies demonstrate the
preferential deposition of PMMA in topographic depressions
of the perovskite layer, such as grain and domain
boundaries. This treatment results in an increase in the
fill factor of more than $4\%$ and an absolute efficiency
boost exceeding $1\%,$ with a maximum efficiency of
$20.4\%.$ Based on these results, we propose a physical
isolation mechanism rather than a chemical passivation of
perovskite defects, which explains not only the data of this
study but also most results found in earlier works.},
cin = {IEK-5},
ddc = {333.7},
cid = {I:(DE-Juel1)IEK-5-20101013},
pnm = {1212 - Materials and Interfaces (POF4-121)},
pid = {G:(DE-HGF)POF4-1212},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000672746800032},
doi = {10.1021/acsenergylett.1c01187},
url = {https://juser.fz-juelich.de/record/904109},
}