Recombination Dynamics of Chlorine Doped Hybrid Perovskite Single Crystals

ORAL

Abstract

Controlling the photo excited properties and behavior of hybrid perovskites by halide doping has the potential to impact a wide range of emerging technologies, including solar cells and radiation detectors. Crystalline samples of methyl ammonium lead bromide (MAPbBr) were substituted with varying levels of Cl at the c site and probed with transient reflectivity spectroscopy. MAPbBr perovskites exhibit an increase in transient reflectivity following photoexcitation, with electron-phonon relaxation on a few picosecond timescale and a triple exponential recombination dynamic which is not complete after 1.5 nanoseconds. The recombination dynamics strongly depend on pump fluences, while the electron-phonon relaxation remains unchanged. We also observed that the doping level affected the electron-phonon coupling within the conduction band, becoming stronger with increased percentage of Cl.

*Research presented in this report was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20180283ER. This work was performed at the Center for Integrated Nanotechnology user facility at Los Alamos National Laboratory.

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Presenters

  • La Moyne Mix

    • Los Alamos National Laboratory

Authors

  • La Moyne Mix

    • Los Alamos National Laboratory

  • Min-Cheol Lee

    • Los Alamos National Laboratory

  • Kenneth O'Neal

    • University of Tennessee, Knoxville
    • Los Alamos National Laboratory

  • Nicholas Sirica

    • Los Alamos National Laboratory
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • Jeremy Tisdale

    • Los Alamos National Laboratory

  • Wanyi Nie

    • LANL
    • Los Alamos National Laboratory

  • Rohit P Prasankumar

    • Los Alamos National Laboratory
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • Dzmitry Yarotski

    • Los Alamos National Laboratory