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HL: Fachverband Halbleiterphysik

HL 43: Perovskite and Hybrid Photovolatics II (joint session HL/CPP)

HL 43.2: Vortrag

Donnerstag, 4. April 2019, 15:15–15:30, H36

Charge Recombination Dynamics in Defect-Engineered Hybrid Organic-Inorganic Halide Perovskites — •Wen-Yu Cheng, Chang-Ming Jiang, and Ian Sharp — Walter Schottky Institut and Physik Department, Technische Universität München, 85748 Garching, Germany

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 a series of thin films with tunable bandgaps from 1.60 to 1.95 eV are fabricated. The concentrations and energetic positions of defects are quantified by photothermal deflection spectroscopy. The effects of these defects on photoluminescence yield are studied by steady-state and time-resolved fluorescence techniques. In addition to shedding light on the interactions between organics cations and the inorganic lattice, the results provide insights into the factors that underlie defect tolerance in hybrid halide perovskite semiconductors.