Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
The success achieved by the nanocrystalline ABX3 perovskites has so far been supported by literally brilliant performances, in terms of quantum efficiency and luminescence together with the well-known and equally impressive properties in photovoltaics, such as light absorption, the extended charge carriers diffusion lengths, the defect tolerance; all combined with easy preparation under moderate conditions. The processes in the liquid phase and the low temperatures are in fact ideal for integration in the methods of preparation of optoelectronic devices. On the other side of the coin, there are still problems related to the stability of the material, the halogens segregation and the processing of colloidal ABX3 nanoparticles as thin film structures. In this work we propose a synthesis of organic-inorganic hybrid perovskites in the form of nanocrystals inside a porous matrix consisting of layers of metal oxide particles.1 In this way, the porous nanoparticulated matrix acts as support to the synthesis of ABX3 nanocrystals in the quantum regime size. As a consequence, it is possible to control the spectral position of the photoluminescence without having to modify the chemical composition of the semiconductor. The so obtained composite structure can then be impregnated with a polymeric precursor which, once condensed, allows to definitively incorporate the perovskite and metal oxide nanoparticles in a flexible film. During the entire process, avoiding the use of ligands, the optical qualities of the nanocrystals are preserved and, in addition, the matrix offers an effective protection against the environmental conditions.
1. A. Rubino et al. to be published
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