DOI: https://doi.org/10.29363/nanoge.sus-mhp.2022.027
Publication date: 15th November 2022
The development of energy-saving, up-scalable and high-throughput routes to synthesize metal halide perovskite-based materials (MHP) is one of the main challenges of making solar energy and lighting devices more economical and environmentally friendly. In this context, microwave (MW) radiation offers a promising approach to achieve high quality NCs of very different nature metals (Au, Ag), metal oxides (FeO, Mn2O3, and CoO) and semiconductors (CdS, CdSe, CuInS2, and PbSe) in very short reaction times [1-3]. Since 2017, several pioneering works employed microwave radiation to promote the crystallization of halide perovskites nanocrystals [4,5].
This presentation will show some examples of lead-based perovskites prepared in our group using a microwave-assisted route. The main advantages of this methodology lie in the short reaction times facilitated by the homogeneous heating of polar solvents and reagents, or the elimination of complicated pre-synthetic procedures (several steps with controlled atmosphere and temperature). In the case of the benchmark all-inorganic perovskite CsPbBr3, the reaction parameters were adjusted to prepare -in a one-step process and in just few minutes- uniform nanocrystals with a well calibrated morphology. After purification, these CsPbBr3 nanocrystals exhibited excellent optoelectronic properties and enhanced stability. Indeed, LEDs have been fabricated with these MW-nanocrystals providing comparable performance to those prepared with hot injection-synthesized nanocrystals.
The work will also focus on the easy and high-throughput microwave-assisted preparation of a benchmark hybrid perovskite, α-FAPbI3, as black powders, that can be used for solar cell fabrication. These MW-presynthesized powders can be stored in a glove box until use. They induce better crystallinity of the α-FAPbI3 films in comparison with the conventional precursor solution method. Consequently, the solar cells fabricated from MW powders presented in average higher performance than conventional devices.
In conclusion, microwave radiation opens new strategies towards more sustainable development of perovskite solar cells.
These pieces of work are the result of the project STABLE PID2019-107314RB-I00 funded by MCIN/AEI/10.13039/501100011033/ and the project UJI-B2021-50 funded by Universitat Jaume I. T. A.-C. da Silva and S.H. Turren-Cruz would like to thank Generalitat Valenciana (Grisolia program GRISOLIAP/2021/096) and the Spanish Agencia Estatal de Investigación (Juan de la Cierva Formación postdoctoral contract FJC2019-041835-I) for their respective financial support.
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