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02_JChen_perovskite.pdf (1015.23 kB)

Single Oxygen Molecule Sensitivity of Organolead Halide Perovskite Photoluminescence

preprint
submitted on 03.02.2019 and posted on 06.02.2019 by 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.

History

Email Address of Submitting Author

chenj@ohio.edu

Institution

Ohio University

Country

United States

ORCID For Submitting Author

0000-0001-7381-0918

Declaration of Conflict of Interest

No conflict of interest is declared.

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