RESEARCH FIELDChemistry › Physical chemistryPhysics › Condensed matter propertiesPhysics › Surface physics
RESEARCHER PROFILEEstablished Researcher (R3)
APPLICATION DEADLINE15/04/2020 23:00 - Europe/Brussels
LOCATIONFrance › Lille
Belgium › Ghent
TYPE OF CONTRACTTemporary
HOURS PER WEEK35
OFFER STARTING DATE01/10/2020
Colloidal nano- and heteronano-structure: from structural to electronic and optical properties
Among the plethora of available colloidal nanostructure (CNS), colloidal nanoplatelets (NPL) are the most impressive materials. They offer a compelling combination of the flatness 2D semiconductors to the richness of the versatile world of colloidal nanostructures. The growth along the confinement dimension (thickness) of all the NPLs in solution can be controlled at the atomic layer scale. This tour de force in the chemical growth is evidenced by a nearly kT-limited emission linewidth in ensemble measurements at room temperature. By contrast with standard 2D semiconductor materials (MoS2, WTe2, ,..), the properties of NPLs can be further tailored. The thickness can be steadily increased which allows tuning the emission from the blue to the red. The spectral region of the emission can be changed from visible to infrared by performing cation exchange on CdSe (CdTe) NPL to obtained PbSe (HgTe) NPL. Furthermore NPL can be efficiently doped with several kinds of atoms as Mn, Ag, Cu,.. which give rise to unprecedented optical properties (large Stokes shift, giant Zeeman splitting,...). Finally, the surface properties can be strongly modified either by performing ligand exchange or by further growing a protective shell around the active core. In the case of CdSe NPL the shell can be made from various semiconducting materials (CdS, CdTe, ZnS, CdZnS) allowing for an engineering of the quantum confinement within the heteronanostructure (HNS).
The PhD project aims at addressing the physical mechanisms involved at the surface and the interface of NPL-based nano- and heteronanostructures. In particular this project will allow for a comprehensive knowledge of the interactions involved in the electronic and the optical properties of NPLs and will set a hallmark for several fundamental parameters that are not yet available (DOS, exciton binding energy, Landé g-factor, band offset in heterostructures) but mandatory to perform theoretical modelling, to predict the fate of charge carriers in heterostructures and to rationalize the design of devices. In addition, the project aims at bridging the optical and the electronic properties to the nanoparticle synthesis and the structural characteristics. The candidate will register at the university of Lille and will perform his PhD under joint supervision of Iwan Moreels at UGhent (https://www.nano.ugent.be/) and Louis Biadala and Bruno Grandidier (IEMN: https://www.iemn.fr/). In this framework, the PhD candidate will perform the growth of the colloidal nanoparticle at UGhent and will study the electronic and the optical properties down to the single nano-object scale under extreme conditions (cryogenic temperature, UHV, high magnetic field) with state of the art equipment available at IEMN: Scanning Tunnelling Microscope, Atomic Force Microscope, Joule-Thompson Microscope, clean room facility (1600m²), cryogen free confocal microscope equipped with a solenoid capable of generating magnetic fields up to 9 Tesla.
We are looking for excellent and highly motivated candidates with a Master degree in physics, solid state physics, semiconductor physics or a relevant field. The degree should be obtained before October 2020
The candidate should send the following documents before 15th of April to: firstname.lastname@example.org. The selected candidate will be informed of the results the 21st of April.
Mandatory document to provide to be selected:
- Curriculum Vitae (CV)
- Cover letter (one-page minimum)
- Copy of passport for students who are not French citizens
- Grades obtained during your last 3 years of graduate studies and a description of the degree programme and courses taken for studies completes outside of France. (Official academic transcripts must be provided for each semester of each year.)
- Copy of post-secondary diplomas (with translation for degrees that were not obtained from an English- or French-speaking country; at this stage these copies do not have to be legalized)
Web site for additional job details
REQUIRED EDUCATION LEVELPhysics: PhD or equivalentChemistry: PhD or equivalent
REQUIRED LANGUAGESENGLISH: Excellent
We are looking for excellent and highly motivated candidates with a Master degree in physics, solid state physics, semiconductor physics or a relevant field. The degree should be obtained before October 2020. The candidate is expected to be self-driven, to have strong work-capacity and enthusiasm for science, and to have good communication skills. A good command of English language, with excellent oral and written skills is required.
Knowledge in: colloidal synthesis, STM, UHV, cryogenic, single dot spectroscopy,confocal microscopy is considered as a plus.
EURAXESS offer ID: 508757
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