Charge Recombination Dynamics in Defect-Engineered Organic-Inorganic Halide Perovskites
Chang-Ming Jiang a, Wen-Yu Cheng a, Michael Ehrenreich b, Gregor Kieslich b, Ian Sharp a
a Walter Schottky Institute and Department of Physics, Technical University of Munich
b Department of Chemistry, Technical University of Munich
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Chang-Ming Jiang, 254
Publication date: 11th February 2019

Organic-inorganic halide perovskites, with their ease of fabrication and bandgap-tunability, provide promising prospects in photovoltaic and light-emitting diode applications. While such materials are highly tolerant of defects, the presence of ionic, along with electronic, charge conduction can result in dynamic optoelectronic properties. In this work, we aim at understanding the charge recombination pathways in defect-engineered perovskites. Point defects are intentionally and controllably introduced into the lattice of methylammonium lead iodide (MAPbI3), and the corresponding impacts to optoelectronic properties are systematically investigated. By manipulating the lattice strain, a series of thin films with tunable bandgaps from 1.60 – 1.85 eV are fabricated. In addition to the concentrations and energetic positions of defects, which are quantified by photothermal deflection spectroscopy, the effects of these defects on photoluminescence yield are studied by steady-state and time-resolved fluorescence techniques. This work not only sheds light on the interactions between organics cations and the inorganic lattice, the results also provide insights into the factors that underlie defect tolerance in hybrid halide perovskite semiconductors.

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