Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.001
Publication date: 11th December 2017
Hybrid organic-inorganic halide perovskite materials such as methylammonium lead iodide have garnered significant interest in the thin film optoelectronics community due to their promising optoelectronic properties. We have determined that the fabrication of perovskite thin films displays all of the hallmarks of sol-gel processing, an aspect that we exploit to improve the quality of spin coated thin films. In particular, we realize films with roughness on the order of 1 nanometer that consist of nanoscale crystallites, formed by incorporating a bulky organoammonium halide in addition to the stoichiometric 3D perovskite precursors. These bulky ligands passivate the 3D crystal, lead to considerably enhanced luminescence quantum yields, and increase stability. LEDs produced in this way are capable of exceeding 10% external quantum efficiency and rigid glass or flexible (and ITO free) substrates, and exhibit significantly improved stability and flexibility. Also, we will show how these smooth films can be employed in pulsed and cw optically pumped laser structures.
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