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02_JChen_perovskite.pdf (1015.23 kB)
Single Oxygen Molecule Sensitivity of Organolead Halide Perovskite Photoluminescence
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submitted on 03.02.2019 and posted on 06.02.2019by Juvinch R. Vicente, Ali Rafiei Miandashti, Kurt Waldo E. Sy Piecco, Joseph R. Pyle, Martin E. Kordesch, Jixin Chen
The photoluminescence (PL) of organolead halide
perovskites (OHPs) is sensitive to its surface conditions, especially surface
defect states, making the PL of small OHP crystals an effective way to report their
surface states. At the ensemble level, when averaging a lot of nanocrystals,
the photoexcitation of OHP nanorods under inert nitrogen (N2) atmosphere
leads to PL decline, while subsequent exposure to oxygen (O2)
results to reversible PL recovery. At the single-particle level, individual OHP
nanorods photoblinks, whose probability is dependent on both the excitation
intensity and the O2 concentration. Combining the two sets of
information, we are able to quantitatively evaluating the interaction between a
single surface defect and a single O2 molecule using a kinetic
model. This model provides fundamental insights that could help reconcile the
contradicting views on the interactions of molecular O2 with OHP
materials and help design a suitable OHP interface for a variety of
applications in photovoltaics and optoelectronics.