10.1021/acsami.9b03822.s002
Juvinch
R. Vicente
Juvinch
R.
Vicente
Ali Rafiei Miandashti
Ali
Rafiei Miandashti
Kurt Waldo E. Sy Piecco
Kurt Waldo E.
Sy Piecco
Joseph R. Pyle
Joseph R.
Pyle
Martin E. Kordesch
Martin E.
Kordesch
Jixin Chen
Jixin
Chen
Single-Particle
Organolead Halide Perovskite Photoluminescence
as a Probe for Surface Reaction Kinetics
American Chemical Society
2019
model
OHP nanorods photoblink
report surface states
O 2 molecule
N 2 atmosphere
Surface Reaction Kinetics Photoluminescence
PL
O 2 concentration
O 2
photoexcited OHP nanorods declines
Single-Particle Organolead Halide Perovskite Photoluminescence
organolead halide perovskites
2019-04-22 00:00:00
Dataset
https://acs.figshare.com/articles/dataset/Single-Particle_Organolead_Halide_Perovskite_Photoluminescence_as_a_Probe_for_Surface_Reaction_Kinetics/8063780
Photoluminescence (PL) of organolead
halide perovskites (OHPs)
is sensitive to OHPs’ surface conditions and is an effective
way to report surface states. Literature has reported that at the
ensemble level, the PL of photoexcited OHP nanorods declines under
an inert nitrogen (N<sub>2</sub>) atmosphere and recovers under subsequent
exposure to oxygen (O<sub>2</sub>). At the single-particle level,
we observed that OHP nanorods photoblink at rates dependent on both
the excitation intensity and the O<sub>2</sub> concentration. Combining
the two sets of information with the charge-trapping/detrapping mechanism,
we are able to quantitatively evaluate the interaction between a single
surface defect and a single O<sub>2</sub> molecule using a new kinetic
model. The model predicts that the photodarkening of OHP nanorods
in the N<sub>2</sub> atmosphere has a different mechanism than conventional
PL quenching, which we call photo-knockout. This model provides fundamental
insights into the interactions of molecular O<sub>2</sub> with OHP
materials and helps design a suitable OHP interface for a variety
of applications in photovoltaics and optoelectronics.