Ytterbium-Doped Grinding-Processed Perovskite Powders
Karolina Maleckaitė a, Simona Streckaitė a, Lukas Miklušis b, Vidas Pakštas b, Marius Franckevičius a, Vidmantas Gulbinas a
a Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Sauletekio Ave. 3, Vilnius, LT-10257, Lithuania
b Department of Characterisation of Materials Structure, Center for Physical Sciences and Technology, Sauletekio Ave. 3, Vilnius, LT-10257, Lithuania
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
#PerFut - Metal Halide Perovskites Fundamental Approaches and Technological Challenges
València, Spain, 2023 March 6th - 10th
Organizers: Wang Feng, Giulia Grancini and Pablo P. Boix
Poster, Karolina Maleckaitė, 338
Publication date: 22nd December 2022

Over the years, perovskites have attracted much interest due to their potential application in the field of solar cells. Recent advances in the field of perovskites have shown that inorganic cesium lead halide perovskites, among other attractive optical and physical properties, exhibit high thermal stability, which is very important for many technological applications. It is known that the widely used CsPbCl3 perovskites demonstrate high emission intensity in the blue region, while the replacement of chloride by bromide redshifts the spectrum. Moreover, CsPbX3 perovskites doped with some lanthanides offer interesting phenomena, such as down-conversion and quantum cutting.

One of such lanthanides is ytterbium (Yb3+). Doping with Yb3+ is very attractive for achieving quantum cutting phenomenon, which is very attractive for down-conversion of the blue spectral range of solar radiation potentially enabling simple way for boosting efficiency of Si solar cells.  The mechanism of quantum cutting is based on the conversion of one high-energy photon into two low-energy photons, leading to quantum yields of over 100%. The CsPbX3 matrix is used as an absorbing material for the UV-blue light region, which transfers energy to the Yb3+ dopants, increasing the quantum yield. Another important property of Yb3+-doped perovskites is their relatively high thermal stability. This means that they can withstand high temperatures without degrading or losing their optical properties, which is essential for use in solar cells.

Perovskite-based materials and electronics are usually fabricated by various techniques, such as solution processing (e.g., spin-coating, blade-coating) or thermal vapor deposition. Unfortunately, aforementioned methods for manufacturing of Yb3+-doped perovskites can be very expensive. Luckily, powder grinding (mechanosynthesis) is a low-cost and scalable method that can be performed with water and an annealing temperature as low as 200 °C. These powders are made by incorporating Yb3+ ions into the perovskite crystal lattice, improving the optical properties of the material and making it suitable for use in solar cells.

In this work, we present the optical properties of Yb3+-doped CsPbX3 perovskites prepared by mechanosynthesis. The study includes X-ray crystallography (XRD) analysis, absorption and fluorescence spectra, fluorescence lifetime kinetics, and fluorescence quantum yield evaluation. Our findings demonstrate how each step of the powder preparation affects the formation of the perovskite. In addition, the results show that Yb3+ ions successfully incorporate into the perovskite lattice and increase the quantum yield when the ratio of Cl- and Br- ions in the samples is optimised.  

This project has received funding from European Regional Development Fund under grant agreement No 01.2.2-LMT-K-718-03-0048 with the Research Council of Lithuania (LMTLT).

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