Year: 2024
Type: article
Abstract: Transferring nanocrystals (NCs) from the laboratory environment toward practical applications has raised new challenges. HgTe appears as the most spectrally tunable infrared colloidal platform. Its low-temperature synthesis reduces the growth energy cost yet also favors sintering. Once coupled to a read-out circuit, the Joule effect aggregates the particles, leading to a poorly defined optical edge and large dark current. Here, we demonstrate that CdS shells bring the expected thermal stability (no redshift upon annealing, reduced tendency to form amalgams, and preservation of photoconduction after an atomic layer deposition process). The electronic structure of these confined particles is unveiled using k.p self-consistent simulations showing a significant exciton binding energy of ∼200 meV. After shelling, the material displays a p - type behavior that favors the generation of photoconductive gain. The latter is then used to increase the external quantum efficiency of an infrared imager, which now reaches 40% while presenting long-term stability.
Source: Nano Letters
Authors: Huichen Zhang, Yoann Prado, Rodolphe Alchaar, Henri Lehouelleur, Mariarosa Cavallo, Tung Huu Dang, Adrien Khalili, Erwan Bossavit, Corentin Dabard, Nicolas Ledos, Mathieu G Silly, Ali Madouri, Daniele Fournier, James K. Utterback, Debora Pierucci, Victor Parahyba, Pierre Potet, David Darson, Sandrine Ithurria, Bartłomiej Szafran, Benjamin T. Diroll, Juan I. Climente, Emmanuel Lhuillier
Institutions: Centre National de la Recherche Scientifique, Sorbonne Université, Institut des NanoSciences de Paris, Université Paris Sciences et Lettres, Laboratoire de Physique et d’Étude des Matériaux, ESPCI Paris, École Normale Supérieure - PSL, Laboratoire de Physique de l'Ecole Normale Supérieure, Synchrotron SOLEIL, Université Paris-Saclay, Centre de Nanosciences et de Nanotechnologies, AGH University of Krakow, Argonne National Laboratory, Center for Nanoscale Materials, Universitat Jaume I
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: U.S. Department of Energy, Agence Nationale de la Recherche, China Scholarship Council, Ministerio de Ciencia e Innovación, Akademia Górniczo-Hutnicza im. Stanislawa Staszica, Office of Science, European Regional Development Fund, Agencia Estatal de Investigación, Basic Energy Sciences, H2020 European Research Council
Awards: G102163711, G1286251239, G1622782223, G2287611682, G262962599, Mixed Dimensional Heterostructures under 2D Ferroelectric control, G3010527862, G3340084831, G3480869486, G3497097516, G3667322904, G426311843, Bright infrared light emitting diode with enhanced light-matter coupling, HgTe nanocrystals a new platform for THz optoelectronics, G498139845, G5080475149, Exotic silicon: silicon clathrate films, G5256542555, Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides, G5387317844, Optoelectronic of narrow band gap nanocrystals, Creating the new generation of 2D light emitters, In OPERAndo study of the electronic property modulation of 2D TWISTed hetero-bilayer, G6848031779, G6918803902, G7084143925, COlloidal nanocrystal Plasmonic detector: a new paradigm for INfrared optoelectronics, Infrared Doped Colloidal Nanocrystals, G7583137537, design and fabrication of a SWIR focal plane array from nanocrystals, Nanobeam soft X-ray microscope to unveil solar cell energy landscape, G969889393, G993149817
OpenAlex ID: W4394769845