Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.070
Publication date: 21st November 2018
Perovskite nanocrystals (NCs), particularly inorganic perovskites, namely CsPbX3 (X= Cl, Br, I) emerged recently as a new class of semiconductors. These materials are of enormous interest due to their intriguing optoelectronic properties such as high quantum yield (QY) and narrow emission line widths. These properties make perovskite NCs great candidates to be integrated in big variety of applications, including light emitting diodes (LEDs) and solar cells. In this work a novel dynamic halogen exchange driven cation exchange strategy was developed to incorporate Ni into CsPbBr3 perovskite hosts at room temperature under ambient conditions. Ni doping has been less investigated in the literature, making this element appealing, besides the fact that Ni doping has the potential to introduce a new functionality of magnetism. A thorough investigation has been done including employing methods of HAADF-STEM combined with EDX mapping which has been showed that Ni is distributed all over the particle, implying on the formation of a Ni shell.
This process is corroborated by a theoretical calculation of DFT, confirming that the exchange of Ni is preferable energetically in a fair agreement to the observations from XPS.
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