Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Perovskite nanocrystals have further increased the scientific interest developed around the photophysical properties of these semiconductors. Their technological potential has generated a strong impulse towards the optimization of their synthesis to overcome stability problems and improve control over shape and size and therefore their optoelectronic behavior. Among the alternatives proposed for the preparation of these materials in the nanoscale, the template method has proven to be an interesting and effective solution [1]. By making use of porous matrices, it is possible to spatially confine the semiconductor growth by exploiting the pores as nanoreactors in which the actual synthesis takes place. In this way it is possible to obtain, for example, composite materials in the form of thin films, containing nanocrystalline perovskites and suitable for integration into a device, as has already been reported in some cases [2], [3].
In this context, the analysis of the process of formation of nanocrystals within the porous structures constitutes an important support for the optimization of both the fabrication and the optoelectronic quality of the perovskites. In the work presented here, we examined the growth of nanocrystalline perovskites in a porous matrix obtained with the stratification of silica particles [4]. The optical transparency of the layer allows the possibility to use the photoluminescence of the perovskites as a diagnostic tool in order to monitor their growth within the porous network. This type of system has also allowed us to analyze the effect of other factors that can take part in the process such as the temperature, light illumination and concentration of the perovskite precursors. Finally, through the experimental study we described the growth dynamic through a theoretical modeling in which the possible phases that govern the formation of the perovskites confined in the matrix are discussed. Based on the analysis presented in this work, indications and recommendations are proposed to improve the strategy for the synthesis of lead halide perovskites nanocrystals.
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