Probing buried recombination pathways in perovskite structures using 3D photoluminescence tomography
Name
c8ee00928g.pdf
Description
Published version
Size
2.63 MB
Format
Adobe PDF
Checksum (MD5)
54ac94ee33c8b839c919a90f6a9c921a
Author(s)
Stavrakas, Camille
Zhumekenov, Ayan A.
Brenes, Roberto
Abdi-Jalebi, Mojtaba
Bulović, Vladimir
Bakr, Osman M.
Barnard, Edward S.
Stranks, Samuel D.
Date Issued
August 2018
Journal
Energy & Environmental Science
Publisher
Royal Society of Chemistry (RSC)
Citation
Stavrakas, Camille et. al., "Probing buried recombination pathways in perovskite structures using 3D photoluminescence tomography." Energy & Environmental Science 11 (August 2018): 2846-2852 doi. 10.1039/C8EE00928G ©2018 Authors
Version
Final published version
Abstract
Perovskite solar cells and light-emission devices are yet to achieve their full potential owing in part to microscale inhomogeneities and defects that act as non-radiative loss pathways. These sites have been revealed using local photoluminescence mapping techniques but the short absorption depth of photons with energies above the bandgap means that conventional one-photon excitation primarily probes the surface recombination. Here, we use two-photon time-resolved confocal photoluminescence microscopy to explore the surface and bulk recombination properties of methylammonium lead halide perovskite structures. By acquiring 2D maps at different depths, we form 3D photoluminescence tomography images to visualise the charge carrier recombination kinetics. The technique unveils buried recombination pathways in both thin film and micro-crystal structures that aren't captured in conventional one-photon mapping experiments. Specifically, we reveal that light-induced passivation approaches are primarily surface-sensitive and that nominal single crystals still contain heterogeneous defects that impact charge-carrier recombination. Our work opens a new route to sensitively probe defects and associated non-radiative processes in perovskites, highlighting additional loss pathways in these materials that will need to be addressed through improved sample processing or passivation treatments. ©2018 The Royal Society of Chemistry.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Creative Commons Attribution 3.0 unported license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1039/C8EE00928G
