Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
The metal halides with perovskite crystalline structure are an example of semiconductors that have given rise to photovoltaic devices and emitters with high efficiency in a short space of time [1-4]. This has been possible because thin layers can be formed by very simple deposition techniques [4], with optical and electro-optical properties as good as those of crystalline semiconductors such as silicon or GaAs. In this work we have studied the light emission properties of semiconductor nanocrystals of CsPbBr3 and CsPbI3 individually at low and room temperatures. These nanocrystals deposited by dip coating the substrate into the colloidal solution, so that they are spatially separated from each other, which allow using a simple photoluminescence micro-spectroscopy assembly, which we have developed in our laboratory. With the statistical study conducted on tens of nanocrystals we have deduced an average peak energy of 2.414 eV (1.83 eV) at room temperature, in freshly prepared samples of CsPbBr3 (CsPbI3), which is consistent with the value measured in dense layers of nanocrystals (2.422 eV) and the average peak energy of CsPbBr3 fresh samples at low temperatures is around 2.31 eV. The line width of the photoluminescence spectrum in these types of layers hardly differs from the value found in the isolated nanocrystals (on average), because the aforementioned width is greater than the dispersion in their peak energies at room temperatures. This dispersion in the energies of the fundamental excitonic transition in the studied nanocrystals is due to the dispersion of their sizes.
Financial support from Spanish MINECO through Project No. TEC2017-86102-C2-1 and are gratefully acknowledged.
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