Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
Despite the outstanding optoelectronic properties of lead halide perovskites, bulk structures still show poor stability against light induced, environmental or thermal stimuli. In this sense, nanocrystal (NC) structures have recently raised attention for their enhanced stability. Further, an emission tunable with crystal size and a high quantum yield make these structures highly relevant for a broad range of applications [1]. While the most widespread synthetic approach for NC is based on colloidal fabrication, alternative ligand-free and low-cost synthesis routes are currently emerging [2]. Besides the specific fabrication procedure, a deep understanding of the growth process as well as the role of external parameters is fundamental in order to achieve high quality NCs.
Employing transparent porous matrices as nano-reactors, we are able to monitor the growth process of perovskite NC by optical means throughout the entire crystallization. In-situ measurements on identical crystal populations allow us to unveil the effects of external parameters affecting the synthesis (such as temperature, light and precursor concentration) and provide a roadmap towards optimal growth conditions. Based on these results, we propose a possible general growth mechanism of perovskite NC. [3]
[1] Akkerman, QA; Rainò, G; Kovalenko, MV; Manna, L. Genesis, challenges and opportunities for colloidal halide perovskite nanocrystals. Nature Materials 2018, 17, 394-405
[2] Rubino, A; Anaya, M; Galisteo-Lopez, J.F.; Rojas, T.C.; Calvo, M.E.; Miguez, H. Highly Efficient and Environmentally Stable Flexible Color Converters Based on Confined CH3NH3PbBr3 Nanocrystals. ACS Appl. Mater. Interfaces 2018, 10, 44, 38334-38340
[3] Tiede, D.O.; Rubino, A.; Calvo, M.E.; Galisteo-López., J.F.; Míguez, H. Lead halide perovskite nano crystal growth within porous matrices (In preparation).
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