Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO23)
Publication date: 3rd April 2023
Inorganic perovskites are currently an area of intense research due to their exceptional photoelectric properties. Their intermediate "zero-dimensional" (0D) crystalline structure, in which adjacent [PbBr6]4− octahedra do not share any corners, is of particular interest as it enhances the thermal and environmental stability of 3D perovskites. Understanding the mechanism of phase conversion is essential for comprehending the physical and chemical processes involved in synthesis and optimizing the performance of perovskite optoelectronic devices. X-ray diffraction (XRD) measurements have previously demonstrated that heating induces the transformation of 0D perovskites into 3D perovskites. In this study, we seek to observe this transformation using in situ heating transmission electron microscopy (TEM). We employ selected area electron diffraction (SAED) to identify the crystal phase at the beginning of the experiment and track the transformation, enabling the collection of statistically relevant information with a low electron dose. We combine the electron diffraction information with imaging to understand the morphological changes as a function of the temperature. Comparison experiments with just the electron beam at similar doses enable to disentagle the electron-beam-induced effects from the heating-induced modifications.
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