Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
DOI: https://doi.org/10.29363/nanoge.hopv.2020.030
Publication date: 6th February 2020
Atomic resolution transmission electron microscope (TEM) studies have been invaluable in understanding the most fundamental properties of many crystalline semiconductor solar cell materials. The large electron energies involved in most TEM studies have, however, meant that studying the typically unstable photoactive hybrid perovskites reliably has been challenging.[1] Particularly the very close structural relationship between certain crystallographic orientations of the pristine perovskite structure and lead iodide has led to previous atomic resolution studies generating ambiguous result that do not correspond well to the crystallographic properties observed with other methods.[2] Using extremely low dose scanning TEM (STEM), we have been able to image hybrid perovskites, including MAPbI3 and FAPbI3, with atomic resolution in accordance to the generally agreed upon crystal structures. As a result, we have been able unequivocally to distinguish the different components of the perovskite structure within the crystal lattice. Furthermore, we have identified nanoscopic domains of PbI2 integrating seamlessly within the perovskite lattice, suggesting that the benign nature of the presence of some PbI2 can be due to the continuous nature of the crystal lattice. These findings pave the way for a significant shift in the level of detail with which the microscopic properties of hybrid photoactive perovskite can be studied, including the crystallographic nature of grain boundaries and the distribution of dopants.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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