Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.088
Publication date: 21st February 2018
ABX3 perovskite family mobilizes a strong interest in the photovoltaics field where optical properties plays an essential role. The ease to play from the solution side with the perovskite precursors or their integration with mesostructures brings a unique opportunity for tailor these properties which are meaningful for a myriad of optoelectronic design. (1) ABX3 perovskites can be also processed as colloidal suspension of nanocrystals in order to enhance their optoelectronic performance. However, many additional steps are needed to obtain stable nanocrystals layers.
In this work, we combine the solution process with the mesostructured templating to develop a method that allows us to synthesize, in a facile way, ABX3 perovskite nanocrystals within the voids of inorganic porous structures.(2) These nanocrystals display features distinctive of quantum confinement, supported by an exhaustive structural and optical characterization. The synthetic approach consists in the use of the pores of optical quality inorganic films as nanoreactors to synthesize MAPbX3 crystallites with narrow size distribution and average radius comprised between 1 nm and 4 nm. Nanocrystal size can be tuned by the template of choice or by the concentration of the precursors. That provides a material with a tunable electronic bandgap, which may be of interest for the development of tandem solar cells based on MAPbI3, which present superior photovoltaic performance than those formed by Br or Cl. Besides, the careful infiltration of the hybrid ABX3 – MOx network with an elastomer allows the lift of the whole ensemble form the rigid substrate leading to a flexible and high emissive film (QY>50%) that can found applications in emission devices.(3) These results open interesting possibilities for the application of MAPbX3 perovskite nanocrystals in optoelectronics as they show they can be synthesized within optical quality films and, due to confinement effects, become stable visible light emitting materials at the desired frequency range.
(1) M.E. Calvo J. Mater. Chem. A 2017, 5, 20561
(2) M. Anaya, A. Rubino, T.C. Rojas, J.F. Galisteo-López, M.E. Calvo, H. Míguez Adv. Opt. Mater. 2017, 5, 1601087
(3) A. Rubino et al. to be published 2018
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