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Zhang H, Prado Y, Alchaar R, Lehouelleur H, Cavallo M, Dang TH, Khalili A, Bossavit E, Dabard C, Ledos N, Silly MG, Madouri A, Fournier D, Utterback JK, Pierucci D, Parahyba V, Potet P, Darson D, Ithurria S, Bartłomiej Szafran, Diroll BT, Climente JI, Lhuillier E. Infrared Imaging Using Thermally Stable HgTe/CdS Nanocrystals. Nano Lett 2024. [PMID: 38608158 DOI: 10.1021/acs.nanolett.4c00907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2024]
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.
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Affiliation(s)
- Huichen Zhang
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | - Yoann Prado
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | - Rodolphe Alchaar
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | - Henri Lehouelleur
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université, CNRS, Paris 75005, France
| | - Mariarosa Cavallo
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | - Tung Huu Dang
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
- Laboratoire de Physique de l'Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Sorbonne Paris Cité, Paris 75005, France
| | - Adrien Khalili
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | - Erwan Bossavit
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
- Synchrotron SOLEIL, Saint-Aubin 91190, France
| | - Corentin Dabard
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université, CNRS, Paris 75005, France
| | - Nicolas Ledos
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | | | - Ali Madouri
- Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, C2N, Palaiseau 91120, France
| | - Daniele Fournier
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | - James K Utterback
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | - Debora Pierucci
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
| | - Victor Parahyba
- New Imaging Technologies SA, Verrières le Buisson 91370, France
| | - Pierre Potet
- New Imaging Technologies SA, Verrières le Buisson 91370, France
| | - David Darson
- Laboratoire de Physique de l'Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Sorbonne Paris Cité, Paris 75005, France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université, CNRS, Paris 75005, France
| | - Bartłomiej Szafran
- Faculty of Physics and Applied Computer Science, AGH University, Kraków PL-30-059, Poland
| | - Benjamin T Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Juan I Climente
- Departament de Quimica Fisica i Analitica, Universitat Jaume I, Castello de la Plana E-12080, Spain
| | - Emmanuel Lhuillier
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, Paris 75005, France
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Dabard C, Po H, Fu N, Makke L, Lehouelleur H, Curti L, Xu XZ, Lhuillier E, Diroll BT, Ithurria S. Expanding the color palette of bicolor-emitting nanocrystals. Nanoscale 2023; 15:14651-14658. [PMID: 37622447 DOI: 10.1039/d3nr03235c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
Owing to their bright and tunable luminescence spectra, nanocrystals appear as a unique playground for light source design. Displays and lighting require white light sources that combine several narrow lines. As Kasha's rule prevents the emission of hot carriers, blends of multiple nanocrystal populations are currently the obvious strategy for broad-band source design. However, a few reports suggest that bicolor emission can also be obtained from a single particle even under weak excitation if a careful design of the exciton scattering mechanism sufficiently slows down its relaxation pathways. A key challenge remains to maintain quantum confinement for color tunability in the same structure, while simultaneously achieving a large size to leverage the critical, slower exciton diffusion or relaxation down to the ground state. Herein, we demonstrate that 2D nanoplatelets offer an original opportunity for the design of confined and large heterostructures. We demonstrate that bicolor emission is not limited to green-red pair and show that blue-yellow and purple-green emissions can be obtained from CdSe/CdTe/CdSe core/crown/crown and CdSe/CdS core/crown heterostructures, respectively.
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Affiliation(s)
- Corentin Dabard
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, France.
| | - Hong Po
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, France.
| | - Ningyuan Fu
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, France.
| | - Lina Makke
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, France.
| | - Henri Lehouelleur
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, France.
| | - Leonardo Curti
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, France.
| | - Xiang Zhen Xu
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, France.
| | - Emmanuel Lhuillier
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France
| | - Benjamin T Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, USA
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, France.
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