Highly dynamic ligand binding and light absorption coefficient of cesium lead bromide perovskite nanocrystals

J. De Roo, M. Ibáñez, P. Geiregat, G. Nedelcu, W. Walravens, J. Maes, J. Martins, I. Van Driessche, M. Kovalenko, Z. Hens, ACS Nano 10 (2016) 2071–2081.

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Journal Article | Published | English
Author
De Roo, Jonathan; Ibanez Sabate, MariaIST Austria ; Geiregat, Pieter; Nedelcu, Georgian; Walravens, Willem; Maes, Jorick; Martins, Jose; Van Driessche, Isabel; Kovalenko, Maksym; Hens, Zeger
Abstract
Lead halide perovskite materials have attracted significant attention in the context of photovoltaics and other optoelectronic applications, and recently, research efforts have been directed to nanostructured lead halide perovskites. Collodial nanocrystals (NCs) of cesium lead halides (CsPbX3, X = Cl, Br, I) exhibit bright photoluminescence, with emission tunable over the entire visible spectral region. However, previous studies on CsPbX3 NCs did not address key aspects of their chemistry and photophysics such as surface chemistry and quantitative light absorption. Here, we elaborate on the synthesis of CsPbBr3 NCs and their surface chemistry. In addition, the intrinsic absorption coefficient was determined experimentally by combining elemental analysis with accurate optical absorption measurements. 1H solution nuclear magnetic resonance spectroscopy was used to characterize sample purity, elucidate the surface chemistry, and evaluate the influence of purification methods on the surface composition. We find that ligand binding to the NC surface is highly dynamic, and therefore, ligands are easily lost during the isolation and purification procedures. However, when a small amount of both oleic acid and oleylamine is added, the NCs can be purified, maintaining optical, colloidal, and material integrity. In addition, we find that a high amine content in the ligand shell increases the quantum yield due to the improved binding of the carboxylic acid.
Publishing Year
Date Published
2016-02-23
Journal Title
ACS Nano
Volume
10
Issue
2
Page
2071 - 2081
IST-REx-ID
363

Cite this

De Roo J, Ibáñez M, Geiregat P, et al. Highly dynamic ligand binding and light absorption coefficient of cesium lead bromide perovskite nanocrystals. ACS Nano. 2016;10(2):2071-2081. doi:10.1021/acsnano.5b06295
De Roo, J., Ibáñez, M., Geiregat, P., Nedelcu, G., Walravens, W., Maes, J., … Hens, Z. (2016). Highly dynamic ligand binding and light absorption coefficient of cesium lead bromide perovskite nanocrystals. ACS Nano, 10(2), 2071–2081. https://doi.org/10.1021/acsnano.5b06295
De Roo, Jonathan, Maria Ibáñez, Pieter Geiregat, Georgian Nedelcu, Willem Walravens, Jorick Maes, Jose Martins, Isabel Van Driessche, Maksym Kovalenko, and Zeger Hens. “Highly Dynamic Ligand Binding and Light Absorption Coefficient of Cesium Lead Bromide Perovskite Nanocrystals.” ACS Nano 10, no. 2 (2016): 2071–81. https://doi.org/10.1021/acsnano.5b06295.
J. De Roo et al., “Highly dynamic ligand binding and light absorption coefficient of cesium lead bromide perovskite nanocrystals,” ACS Nano, vol. 10, no. 2, pp. 2071–2081, 2016.
De Roo J, Ibáñez M, Geiregat P, Nedelcu G, Walravens W, Maes J, Martins J, Van Driessche I, Kovalenko M, Hens Z. 2016. Highly dynamic ligand binding and light absorption coefficient of cesium lead bromide perovskite nanocrystals. ACS Nano. 10(2), 2071–2081.
De Roo, Jonathan, et al. “Highly Dynamic Ligand Binding and Light Absorption Coefficient of Cesium Lead Bromide Perovskite Nanocrystals.” ACS Nano, vol. 10, no. 2, American Chemical Society, 2016, pp. 2071–81, doi:10.1021/acsnano.5b06295.

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