Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.189
Publication date: 18th July 2023
Engineering halide Perovskite heterostructures and interfaces are of great interest. One way to introduce interfaces is by growing perovskite crystals from vapor on various substrates. A significant aspect of such interfaces is the accommodation of stress. Structural transformations from higher to lower symmetries are common in halide perovskites. Such transformations are observed at relatively low temperatures (compared to oxides). Interestingly, structural transformation can also be triggered by a crystallographic strain effect called ferroelasticity. In the case of the frustrated halide perovskite crystals, the strain is relaxed by the formation of crystallographic twin domains.
This work focuses on CsPbBr3 microcrystals grown through vapor deposition within a tube furnace on a Si substrate. Due to the strains and differences in cooling regimes between the perovskites and substrate twin domain are observed. This particular system has been previously explored via X-ray diffraction (XRD), and the nature of the crystal twin structure was determined [1]. It was also shown that sample heating and cooling would induce reversible switching of these domains[2]. However, the impact on the crystals' functional properties remains unexplored mainly and unused.
This work shows that these domains' electro-optical properties can be significantly different. We correlate the known structural domains and the phases' local conductivity, optical properties, and photoconductivity. This is achieved using a conductive AFM module and is further supported by photoluminescence (PL) and cathodoluminescence (CL) measurements, which reveal alternating PL and CL characteristics on the surfaces of these crystals. AFM measurements provide insights into the structural ordering of these domains, while electrical measurements demonstrate different conductivities and surface energies among the various domains.
This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 949682-ERC-HeteroPlates
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