Stabilisation of Cesium Lead Halide Perovskite Nanocrystals by Means of Polydentate Ligands

Maksym Kovalenko^a^,^b, Sergii Yakunin^a^,^b, Georgian Nedelcu^a^,^b, Loredana Protesescu^a^,^b, Franziska Krieg^a^,^b

^aETH Zurich, Laboratory of Inorganic Chemistry, Department of Chemistry & Applied Biosciences, Vladimir-Prelog-Weg, 1, Zürich, Switzerland

^bEMPA - Swiss Federal Laboratories for Materials Science and Technology, Überland Strasse, 129, Dübendorf, Switzerland

Materials for Sustainable Development Conference (MATSUS)
Proceedings of September Meeting 2016 (NFM16)

Berlin, Germany, 2016 September 5th - 13th

Organizers: Marin Alexe, Enrique Cánovas, Celso de Mello Donega, Ivan Infante, Thomas Kirchartz, Maksym Kovalenko, Federico Rosei, Lukas Schmidt-Mende, Laurens Siebbeles, Peter Strasser, Teodor K Todorov, Roel van de Krol and Ulrike Woggon

Poster, Franziska Krieg, 127
Publication date: 14th June 2016

Despite their relatively recent discovery (1), fully-inorganic lead halide perovskite nanocrystals (CsPbX₃) have already emerged as a popular optoelectronic material for research purposes and likely with considerable potential for commercial applications in television displays. By being air and moisture stable as synthesized and having fluorescence quantum yields up to 80% without demanding complicated synthesis procedures they were tested in various devices such as LEDs (2) and Lasers (3). Fast anion exchange between nanocrystals allows for colour tuning even after synthesis (4) however it impairs usage of these nanocrystals in white light emitting diodes since anion exchange is even present between solid samples of these nanocrystals. It was shown lately that the ligands covering the CsPbBr₃ crystals after synthesis are in fast exchange with free ligands in solution (5) while anionic conductivity has been shown some time ago (6). In order to hinder anion exchange between cesium lead halide nanocrystals in cases where it is not desired and to enable facile device fabrication from colloidal dispersions, our group is developing multi-dentate ligands which are compatible with the perovskite system and bind more tightly to the surface of the nanocrystals as a result of the chelate effect.

1. Protesescu L, Yakunin S, Bodnarchuk MI, Krieg F, Caputo R, Hendon CH, et al. Nanocrystals of Cesium Lead Halide Perovskites (CsPbX(3), X = Cl, Br, and I): Novel Optoelectronic Materials Showing Bright Emission with Wide Color Gamut. Nano Lett. 2015;15(6):3692-6.

2. Zhang X, Lin H, Huang H, Reckmeier C, Zhang Y, Choy WCH, et al. Enhancing the Brightness of Cesium Lead Halide Perovskite Nanocrystal Based Green Light-Emitting Devices through the Interface Engineering with Perfluorinated Ionomer. Nano Letters. 2016;16(2):1415-20.

3. Yakunin S, Protesescu L, Krieg F, Bodnarchuk MI, Nedelcu G, Humer M, et al. Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites. Nat Commun. 2015;6:8056.

4. Nedelcu G, Protesescu L, Yakunin S, Bodnarchuk MI, Grotevent MJ, Kovalenko MV. Fast Anion-Exchange in Highly Luminescent Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, I). Nano Lett. 2015;15(8):5635-40.

5. De Roo J, Ibáñez M, Geiregat P, Nedelcu G, Walravens W, Maes J, et al. Highly Dynamic Ligand Binding and Light Absorption Coefficient of Cesium Lead Bromide Perovskite Nanocrystals. ACS Nano. 2016;10(2):2071-81.6. Junichiro Mizusaki KAaKF. Ionic Conduction of the Perovskite-Type Halides. solid state ionics. 1983;11:203-11.

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