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Willem Walravens
Researcher at Ghent University
Publications - 15
Citations - 1643
Willem Walravens is an academic researcher from Ghent University. The author has contributed to research in topics: Quantum dot & Nanocrystal. The author has an hindex of 9, co-authored 13 publications receiving 1191 citations. Previous affiliations of Willem Walravens include Columbia University.
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Journal ArticleDOI
Highly Dynamic Ligand Binding and Light Absorption Coefficient of Cesium Lead Bromide Perovskite Nanocrystals
Jonathan De Roo,Maria Ibáñez,Maria Ibáñez,Pieter Geiregat,Georgian Nedelcu,Willem Walravens,Jorick Maes,José C. Martins,Isabel Van Driessche,Maksym V. Kovalenko,Maksym V. Kovalenko,Zeger Hens +11 more
TL;DR: It is found that ligand binding to the NC surface is highly dynamic, and therefore, ligands are easily lost during the isolation and purification procedures, and when a small amount of both oleic acid and oleylamine is added, the NCs can be purified, maintaining optical, colloidal, and material integrity.
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A Library of Selenourea Precursors to PbSe Nanocrystals with Size Distributions near the Homogeneous Limit
Michael P. Campos,Mark P. Hendricks,Alexander N. Beecher,Willem Walravens,Willem Walravens,Robert Andrew Swain,Gregory T. Cleveland,Zeger Hens,Matthew Y. Sfeir,Jonathan S. Owen +9 more
TL;DR: A tunable library of N,N,N'-trisubstituted selenourea precursors and their reaction with lead oleate at 60-150 °C to form carboxylate-terminated PbSe nanocrystals in quantitative yields is reported.
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Size and Concentration Determination of Colloidal Nanocrystals by Small-Angle X-ray Scattering
Jorick Maes,Nicolo Castro,Kim De Nolf,Willem Walravens,Benjamin Abécassis,Benjamin Abécassis,Zeger Hens +6 more
TL;DR: In this paper, a method for sizing quasi-spherical colloidal nanocrystals (NCs) by means of small-angle X-ray scattering (SAXS) was proposed.
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Chemically Triggered Formation of Two-Dimensional Epitaxial Quantum Dot Superlattices
Willem Walravens,Jonathan De Roo,Emile Drijvers,Stephanie ten Brinck,Eduardo Solano,Jolien Dendooven,Christophe Detavernier,Ivan Infante,Zeger Hens +8 more
TL;DR: It is demonstrated that surface active additives known to restore nanocrystal stoichiometry can trigger the formation of epitaxial superlattices of PbSe and PbS quantum dots, and it is concluded that the approach offers a reproducible and rational method for theformation of highly ordered epitaxia quantum dot superlATTices.
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Slow recombination in quantum dot solid solar cell using p–i–n architecture with organic p-type hole transport material
Xiaoliang Zhang,Yolanda Justo,Jorick Maes,Willem Walravens,Jindan Zhang,Jianhua Liu,Zeger Hens,Erik M. J. Johansson +7 more
TL;DR: In this paper, an organic-inorganic hybrid p-i-n architecture for the heterojunction PbS QD solid solar cell is constructed to increase the charge extraction and reduce charge recombination.