AVS 66th International Symposium & Exhibition
    2D Materials Thursday Sessions
       Session 2D+EM+MI+NS+QS+SS-ThM

Paper 2D+EM+MI+NS+QS+SS-ThM4
Interaction of Molecular O2 with Organolead Halide Nanorods by Single-Particle Fluorescence Microscopy

Thursday, October 24, 2019, 9:00 am, Room A216

Session: Dopants, Defects, and Interfaces in 2D Materials
Presenter: Juvinch Vicente, Ohio University
Authors: J. Vicente, Ohio University
J. Chen, Ohio University
Correspondent: Click to Email
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 evaluate 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.