Perovskite Crystalline Phase Stability Beyond the Goldschmidt Tolerance Factor
Iván Mora-Seró a
a Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Oral, Iván Mora-Seró, presentation 003
DOI: https://doi.org/10.29363/nanoge.nipho.2020.003
Publication date: 25th November 2019

An extensive use of renewable and clean energies is required to reduce the strong dependence on fossil fuels and its effect in the climate change. At the same time, new and more advanced systems have to be developed in order to allow a real energy savings. Solar energy, the most abundant renewable energy source, becomes a key actor. Through the photovoltaic effect, this energy can be converted directly into electrical power easy to transport or ready to be consumed in place. In this context, Halide Perovskite (HP) have been emerged as extremely appealing materials with record photoconversion efficiencies higher than 25%. In addition, the goodness of these materials to produce high efficiency solar cells makes them also suitable for the preparation of efficient LED, a key technology to increase energy savings as illumination is the responsible of the 20% of the total electric power consumption. Despite this impressive achievements, ABX3halide materials suffer for some constrains as not always can crystallize with perovskite structure, where B cation is 6-fold coordinated to X anions (a corner sharing [BX6] octahedra) and the A cation occupying the 12-fold cuboctahedral coordination site. In some cases, depending on the Goldschmid tolerance factor and the octahedral factor (determined by A, B and X radii), the octahedra cannot share the corners. This fact influences dramatically the material properties, increasing significantly the bandgap and affecting deleteriously the transport properties. Thus, the interest of the materials with this non-perovskite phase decreases for the fabrication of optoelectronic devices. In this presentation we analyze different ways in which the constrains limiting the phase stability can be surpassed.

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