Hybrid Organic-Inorganic Metal-Halide Perovskites for Future Optoelectronic and Photonic Devices

Dr. Evan Lafalce
Department of Physics & Astronomy
University of Utah

One of the most consistent motivations for the scientific exploration of new materials over the last several decades has been the development of photovoltaic diodes, or solar cells, that can produce high-efficiencies but offer lower fabrication and material costs than devices based crystalline semiconductors, as these costs have been a historical limiting factor in wide-scale commercial use.  Notable among these materials are the organic semiconductors and colloidal quantum dots, and most recently the hybrid organic-inorganic metal-halide perovskites.  The hybrid perovskite solar cells have emerged from the abyss to display efficiencies approaching those with single-crystalline Silicon solar cells in just the last few years.  Beyond solar cells, these perovskites also display additional interesting physical properties that make them suitable for optoelectronic and photonic applications including light-emitting diodes, lasers, non-linear optical components.  Beyond devices, these materials display an abundance of interesting physical behavior and their investigation has grown into multi-faceted collaborative effort between experimental and theoretical condensed matter physicists, chemists, and materials scientists.  In this presentation I will provide an introductory overview of the hybrid organic-inorganic metal-halide perovskites and their context within semiconductor materials research, highlighting some of the early breakthroughs and outstanding questions.  I will present results of our investigations at the University of Utah on the optical and electronic properties of single crystals and polycrystalline thin films of metal-halide perovskites, with an emphasis on their lasing behavior and non-linear optical properties.  I will also discuss some of the current directions of our work involving quantum-confined, lower-dimensional variants of these materials in the form of two-dimensional multilayer quantum wells and zero-dimensional quantum dots.