A5036431763- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- 2D Materials and Applications
- Advanced Semiconductor Detectors and Materials
- Perovskite Materials and Applications
- Nanocluster Synthesis and Applications
- Advanced Optical Sensing Technologies
- Advanced Thermoelectric Materials and Devices
- Nanowire Synthesis and Applications
- Carbohydrate Chemistry and Synthesis
- Gold and Silver Nanoparticles Synthesis and Applications
- Copper-based nanomaterials and applications
- Advanced Fluorescence Microscopy Techniques
- Gas Sensing Nanomaterials and Sensors
- Synthetic Organic Chemistry Methods
- Photoacoustic and Ultrasonic Imaging
- Traditional and Medicinal Uses of Annonaceae
- Crystal Structures and Properties
- Topological Materials and Phenomena
- Analytical Chemistry and Sensors
III V Lab
2024
Centre National de la Recherche Scientifique
2013-2022
Sorbonne Université
2017-2022
Institut des NanoSciences de Paris
2021-2022
Université Paris 1 Panthéon-Sorbonne
2022
Laboratoire de Physique et d’Étude des Matériaux
2016-2019
Université Paris Sciences et Lettres
2016-2019
ESPCI Paris
2013-2019
Délégation Paris 6
2019
ParisTech
2016-2017
Two-dimensional colloidal nanoplatelets (NPLs), owing to the atomic-level control of their confined direction (i.e., no inhomogeneous broadening), have demonstrated improved photoluminescence (PL) line widths for cadmium chalcogenide-based nanocrystals. Here we use cation exchange synthesize mercury chalcogenide NPLs. Appropriate reaction kinetics enables 2D morphology NPLs be maintained during exchange. HgTe and HgSe significantly optical features compared existing materials with similar...
HgTe nanocrystals, thanks to quantum confinement, present a broadly tunable band gap all over the infrared spectral range. In addition, significant efforts have been dedicated design of sensors with an absorbing layer made nanocrystals. However, most focused on single pixel sensors. Nanocrystals offer appealing alternative epitaxially grown semiconductors for imaging by reducing material growth cost and easing coupling readout circuit. Here we propose strategy focal plane array from...
Among colloidal nanocrystals, 2D nanoplatelets (NPLs) made of II-VI compounds appear as a special class emitters with an especially narrow photoluminescence signal. However, the PL signal in case NPLs is only tunable by discrete step. Here, we demonstrate that doping viable path to finely tune color these from green red, making them extremely interesting phosphors for wide-gamut display. In addition, using combination luminescence spectroscopy, tight-binding simulation, transport, and...
An array of C-aryl and C-vinyl furanosides were prepared in good yields diastereoselectivities from C-halogeno either with aryl Grignard or vinyl using the convenient Co(acac)3/TMEDA catalytic system. This method is illustrated by total synthesis (-)-isoaltholactone.
We investigate the electronic and transport properties of HgTe 2D colloidal quantum wells. demonstrate that material can be made p- or n-type depending on capping ligands. In addition to control majority carrier type, surface chemistry also strongly affects photoconductivity material. These measurements are correlated with structure determined by high resolution X-ray photoemission. attribute change carriers strong hybridization an n-doped HgS layer resulting from nanoplatelets S2- ions....
Thanks to their narrow band gap nature and fairly high carrier mobility, HgTe nanocrystals (NCs) are of utmost interest for optoelectronics beyond the telecom window (λ > 1.55 μm). In particular, they offer an interesting cost-effective alternative well-developed InGaAs technology. However, in contrast PbS, far less work has been dedicated integration this material photodiodes. short-wave infrared region, NCs have a more p-type character than mid-wave thus promoting development new electron...
Among semiconductor nanocrystals (NCs), 2D nanoplatelets (NPLs) are a special class of nanomaterials with well controlled optical features. So far, most the efforts have been focused on wide band gap materials such as cadmium chalcogenide semiconductors. However, absorption can be pushed toward infrared (IR) range using narrow mercury chalcogenides. Here we demonstrate feasibility core/shell structure made CdSe core two HgSe external wells. We that spectrum heterostructure is set by wells...
Nanocrystal integration into focal plane arrays requires the development of new photodiode designs combining an efficient charge dissociation with a low dark current. Previously reported architectures based on HgTe/Ag2Te stacks appear to be suboptimal for cutoff wavelengths below 2.5 μm. Here, we show that introduction thin and strongly coupled CdSe layer acting as electron transport unipolar barrier drastically improves electrical performances. This diode achieves responsivity high 0.8 A...
Colloidal 2D nanoplatelets (NPLs) are a class of nanoparticles that offer the possibility forming two types heterostructures, by growing either in confined direction or perpendicular to direction, called core/crown NPLs. Here, we demonstrate bicolor emission can be obtained from NPLs with geometry. To date, for CdSe/CdTe type-II band alignment, only charge transfer has been observed due very fast (<picoseconds) electrons toward CdSe core. show using CdSe1–xTex alloys crowned right...
II–VI two-dimensional (2D) nanoplatelets (NPLs) exhibit the narrowest optical features among nanocrystals (NCs). This property remains true for Hg-based NPLs, despite a cation exchange procedure to obtain them from Cd-based which leads structural defects (poorly defined edges and voids) inducing inhomogeneous broadening. Here, we propose an optimized solvent, surface chemistry, reaction conditions are rationally considered. The is applied growth of alloyed HgSe1–xTex NPLs with various...
Abstract Nanocrystals (NCs) have reached a high level of maturity, enabling their integration into optoelectronic devices. The next challenge is the combination several types devices one complex system to achieve better on‐chip integration. Here, an all‐HgTe‐NC active imaging setup operating in short‐wave infrared (IR) focused on. First, design optimized IR light‐emitting diode (LED) It shown that halide technology processing enables increase electroluminescence signal by factor 3, while...
As nanocrystals (NCs) gain maturity, they become central building blocks for optoelectronics in devices such as solar cells and, more recently, infrared focal plane arrays. Now that the proof of concept these has been established, their optimization requires a deeper understanding electronic and optical features to engineer optoelectronic properties accurately. Though PbS NCs have extensively investigated, complex index NC thin films remains mostly unknown. Some previous works unveiled this...
Among colloidal nanocrystals, 2D nanoplatelets (NPLs) made of cadmium chalcogenides have led to especially well controlled optical features. However, the growth core shell heterostructures has so far been mostly focused on CdS shells, while more confined materials will be promising decouple emitting quantum states from their external environment. Using k·p simulation, we demonstrate that a ZnS reduces by factor 10 leakage wavefunction into surrounding medium. X-ray photoemission (XPS),...
Infrared spectra of CdTe, HgTe and HgTe/CdS nanoplatelets.
Hopping transport associated with the granular nature of nanocrystal arrays has led to thought that nanocrystal-based devices might be incompatible fast operation. Here, we explore design HgTe sensors operating in short-wave infrared and a very time response down few nanoseconds. To reach this goal, relies on planar geometry reduce device capacitance. A strong in-built electric field is tailored via electrostatic control from two bottom split-gate electrodes, which promote charge extraction....
For short wave infrared (SWIR) sensing, InGaAs is the leading technology combining high carrier mobility, homogeneity, and complete control over n-to-p doping. In meanwhile, numerous alternative materials have tried to compete with InGaAs. Among them, colloidal nanocrystals narrow bandgap can address current issue in designing cost-effective sensors for SWIR range. Rather than putting these two against each other, we design here a synergistic duo which HgTe are used broaden spectral range of...
Colloidal nanocrystals are playing an increasing role for the development of low cost optoelectronics. Among these materials, 2D nanoplatelets (NPL) offer particularly well-controlled optical features and their integration into device such as transistor photoconductor is here discussed. We present recent results obtained on optoelectronic properties CdSe/CdS HgTe (NPL). The manuscript organized along three main sections. first part introduction to NPLs structural properties. second gets...
In this paper, we discuss recent progress obtained on infrared nanocrystal based mercury chalcogenides (HgTe and HgSe). These materials can become some key building blocks for the next generation of optoelectronic devices. To reach goal, nanocrystals need to combine fine control optical features efficient electronic transport. Here, report about (i) development HgTe NPL enhanced (narrower faster PL) in near IR (ii) self-doped HgSe demonstrate tunable intraband absorption up THz range.
Colloidal 2D nanoplatelets (NPLs) are a class of nanoparticles that offer the possibility forming two types heterostructures, by growing either in confined direction or perpendicular to direction, called core/crown NPLs. Here, we demonstrate bicolor emission can be obtained from NPLs with geometry. To date, for CdSe/CdTe type-II band alignment, only charge transfer has been observed due very fast (<picoseconds) electrons toward CdSe core. show using CdSe1–xTex alloys crowned right...