Understanding the microwave-assisted synthesis of CsPbBr3 perovskite nanocrystals for light-emitting diodes.
Thais Caroline de Almeida da Silva a, Rafael Sánchez Sánchez a, Iván Mora-Seró a, Beatriz Julián-López a
a Institute of Advanced Materials (INAM), Universitat Jaume I, Castellón, Spain.
Proceedings of Sustainable Metal-halide perovskites for photovoltaics, optoelectronics and photonics (Sus-MHP)
València, Spain, 2022 December 12th - 13th
Organizers: Teresa S. Ripolles and Hui-Seon Kim
Poster, Thais Caroline de Almeida da Silva, 041
Publication date: 15th November 2022

Climate change and environmental degradation, mainly associated to the use of fossil fuels, are existential threats to the world. So, new and more advanced systems with reduced energy consumption have to be developed in order to allow a real energy savings.  In this context, the fabrication of low-cost, environmentally-friendly and high-efficiency optoelectronic devices such as solar cells, LEDs, photodetectors, sensors or luminescent solar concentrators, is now more than ever a need to be addressed. The halide perovskites nanocrystals have been emerged as extremely appealing materials due to their promising properties such as high absorption coefficient, tunable absorption and emission ranges, and their high quantum efficiencies.

In this work, we present the microwave-assisted preparation of uniform CsPbBr3 nanocrystals. A systematic analysis of different synthetic parameters was performed (temperature, time, reagents, solvent, etc.) allowed us to have a map of conditions to obtain crystals with controllable morphologies and crystalline phases in one step process. The versatility of microwave-assisted synthesis, not only in reaction time and temperature, but also in the nature of the salts and the solvents (or mixture of solvents), and additional complexing ligands and structure-directing agents, allow us to play with the nucleation and growth mechanisms. This work opens a land of possibilities for preparing nanostructured halide perovskite materials with a broad range of applications.

The work is supported by the Santiago Grisolía Program (GRISOLIAP/2021/096) from Generalitat Valenciana, Universitat Jaume I (project UJI-B2021-50) and the R+D+i project PID2019-107314RB-I00 funded by MCIN/ AEI/10.13039/501100011033).

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