Post-Doctoral Fellow in Chemistry of materials

29 Mar 2024
Job Information

Organisation/Company

Ecole supérieure de physique et de chimie industrielles de la ville de Paris

Department

Laboratoire de Physique et d’Etude des Matériaux

Research Field

Chemistry » Physical chemistry

Researcher Profile

Recognised Researcher (R2)

Country

France

Application Deadline

15 May 2024 - 12:00 (Europe/London)

Type of Contract

Temporary

Job Status

Full-time

Hours Per Week

40

Offer Starting Date

29 Mar 2024

Is the job funded through the EU Research Framework Programme?

H2020 / ERC

Reference Number

Project Ne2DeM number 853049

Is the Job related to staff position within a Research Infrastructure?

No

Offer Description

Synthesis and characterization of dual emitters nanocrystals

Semiconductor colloidal nanocrystals present optical properties tunable with their size and compositions, and it’s been 8 years that these nanocrystals are introduced in displays as a source of light. In these displays a blue LED excites a mixture of green and red emitters such as the combination of these three colors provide a large range of color. This range is as broad as the emission of nanocrystals is narrow and at the right wavelength. Among existing colloidal nanocystals, 2D nanoparticles (called nanoplatelets NPLs),1 present enhanced optical properties due to their thickness control at the atomic scale without roughness. In a dispersion, all the NPLs have exactly the same thickness and present a narrow emission around kT.2 The goal of the project will be to propose a new generation of dual emitters NPLs.

During the Post-doc, the student will have to synthesize and study heterostructured NPLs with dual green and red emission with high quantum efficiency, the final goal being their integration in LEDs. We recently showed that CdSe/CdTe/CdSe NPLs emit both narrow green and broad red emission and that the ratio between the two colors can be tuned by the fluence.3 The next challenge is to increase the quantum efficiency through the growth of a shell of semiconductor. Thus, first it will be necessary to blue shift the optical properties of dual emitters NPLs in order to preserve emission on the right wavelengths after the growth of the shell. Here we propose to either work with thinner NPLs, or alloyed NPLs or NPLs with steps.

References

1 Ithurria, S. et al. Quasi 2D Colloidal CdSe Platelets with Thicknesses Controlled at the Atomic Level. J. Am. Chem. Soc. 2008, 130 (49), 16504–16505.

2 Diroll, B. T et al. 2D II-VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration. Chem. Rev. 2023

3 Dabard, C. et al.Double-crowned 2D semiconductor nanoplatelets with bicolor power-tunable emission Nature Comm. 2022, 13 (1), 5094

Requirements

Research Field

Chemistry

Education Level

Master Degree or equivalent

Skills/Qualifications

Pluridisciplinar PhD student with a background in physics (mechanic, physic of semiconductor) and chemistry (colloidal synthesis).

Specific Requirements

Colloidal synthesis, Absorption spectroscopy, Emission spectroscopy, Dichroism spectroscopy, Transmission Electron microscopy, Scanning Electron Microscopy, X-Ray diffraction

Languages

ENGLISH

Level

Good

Research Field

Chemistry

Years of Research Experience

1 - 4

Additional Information
Eligibility criteria

PhD degree

Selection process

Cover letter and CV

Work Location(s)

Number of offers available

1

Company/Institute

Laboratoire de Physique et d’Etude des Matériaux

Country

France

Geofield

Where to apply

E-mail

[email protected]

Contact

City

Paris

Website

https://www.espci.fr/fr/

Street

10 rue Vauquelin

Postal Code

75005

E-Mail

[email protected]

Phone

[email protected]

Mobile Phone

+33 6 95 65 63 90

STATUS: EXPIRED