Monitoring Charge Separation and Injection Processes of Semiconductor Perovskite Thin Films

ORAL

Abstract

In the past several years, semiconductor perovskites have had a major impact on the field of photovoltaics with device efficiencies reaching up to 20.1{\%}. By studying the photophysical properties of these sensitizers, valuable information about the charge carrier relaxation processes is gained and insight into charge transfer and recombination processes that occur within the sensitizer and its interfaces after photoexcitation is obtained, all of which are useful to further help increase the efficiencies of perovskite based devices. Two of the main variables that have shown to have an effect on device efficiency is the substrate that the perovskite is coated on and the precursors used to prepare the perovskite films. In this talk I will focus on the ultrafast photophysics of perovskites studied by way of time resolved photoluminescence measurements. To better understand how the aforementioned variables effect device efficiencies, the ratio of CH$_{3}$NH$_{3}$I:CH$_{3}$NH$_{3}$Cl:PbI$_{2}$ in the precursor solution is varied and these solutions are coated on either a planar or mesoporous TiO$_{2}$ substrate. The charge carrier injection dynamics of these prepared films are investigated and their implications on device efficiencies is discussed.

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Authors

  • Christopher McCleese

    Case Western Reserve University

  • Mikhail Zamkov

    University of Notre Dame, University of Toledo, Case Western Reserve University, John Carroll University, Bowling Green State Univ, Materials Science and Technology Division, Oak Ridge National Laboratory, Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Ohio University, Shanghai Jiao Tong University, Department of Chemistry and Biochemistry, University of Toledo, Department of Chemical Engineering, University of Toledo, Wuhan University, Southeast University, Physics and Astronomy and Center for Photochemical Science, Bowling Green State University, Physics and Astronomy, University of Toledo, Air Force Research Laboratory, Physics and Astronomy, Bowling Green State University, Purdue University, Student/Supervisor, Student, None, University of Michigan, Dearborn, Clemson University, Michigan State University, Bowling Green State University, Physics Dep, Cleveland State University, Physical Therapy Program, Central Michigan State University

  • Mikhail Zamkov

    University of Notre Dame, University of Toledo, Case Western Reserve University, John Carroll University, Bowling Green State Univ, Materials Science and Technology Division, Oak Ridge National Laboratory, Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Ohio University, Shanghai Jiao Tong University, Department of Chemistry and Biochemistry, University of Toledo, Department of Chemical Engineering, University of Toledo, Wuhan University, Southeast University, Physics and Astronomy and Center for Photochemical Science, Bowling Green State University, Physics and Astronomy, University of Toledo, Air Force Research Laboratory, Physics and Astronomy, Bowling Green State University, Purdue University, Student/Supervisor, Student, None, University of Michigan, Dearborn, Clemson University, Michigan State University, Bowling Green State University, Physics Dep, Cleveland State University, Physical Therapy Program, Central Michigan State University

  • Clemens Burda

    Case Western Reserve University