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Transport and Optical Properties of Individual Colloidal quantum wells

ABG-92802 Thesis topic
2020-06-30 < €25,000 annual gross
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Institut d'électronique de microélectronique et de nanotechnologie
Lille - Les Hauts de France - France
Transport and Optical Properties of Individual Colloidal quantum wells
  • Physics
  • Materials science
electronic and optical spectroscopy, STM, AFM, colloidal nanostructures, single dot spectroscopy,

Topic description

The past few years a tremendous attention has been given to colloidal semiconductor nanoplatelets (NPL). As compared to other semiconductor materials, NPL stand out because they combine low-cost fabrication and a suitability for solution-based processing with on-demand physical and chemical properties impart by, for example, size quantization and surface functionalization.1 NPLs offer a compelling combination of the flatness 2D semiconductors to the richness of the versatile world of colloidal nanostructures. As a result, they are currently explored as an opto-electronic material for a broad range of applications, such as photo-detection, lighting and lasing, biological labelling, single photon emission, nanosensing, memristor

So far NPLs have mainly been studied using ensemble optical spectroscopy techniques. After years of intensives studies, the success in understanding the physics of NPLs is mitigated since numbers of the interpretations involving the NPL surface or interfaces still remain either speculative2 or controversial.3,4 These problems find their source in the void left by the lack of knowledge in the fundamental electronic properties of NPLs. For example, fundamental information such as the density of state (DOS) or the binding energy of the exciton in NPLs remains unknown. The former has never been measured, while the latter has only been roughly estimated. In addition, about 50% of the atoms lay at the surface in NPL and play a pivotal role in the physical properties, via the presence of dangling bonds. Unveiling the nature and the position within the gap of surface dangling bonds state are crucial to properly addressed the NPLs surface and to further tailor their properties. In the same vein, the ability to create heteronanostructures (HNS) by growing a shell around the core raises several questions notably on the abruptness of the interface and on the band offset at the heterojunction. These tremendous parameters are still unclear and intensively debated in the literature.
The project aims at addressing the physical mechanisms involved at the surface and the interface of NPL-based nano- and heteronanostructures by studying the electronic and the optical properties at the scale of the individual nanoparticle under extreme conditions (cryogenic temperature, UHV, high magnetic field) at the state of the art facility available at IEMN: Scanning Tunnelling Microscope (STM), Atomic Force Microscope (AFM), Joule-Thompson Microscope, clean room facility (1600m²), cryogen free confocal microscope equipped with a solenoid capable of generating magnetic fields up to 9 Tesla.

Funding category

Public/private mixed funding

Funding further details

ANR

Presentation of host institution and host laboratory

Institut d'électronique de microélectronique et de nanotechnologie

The PhD candidate will join the team “Physics of nanostructures and quantum devices”, an energetic team of 4 PhDs, 2 CNRS researchers, 2 assistants professor and 2 research engineers . He/she will be supervised by Grandidier Bruno and co-supervised by Biadala Louis. The group works closely with the leading groups in many related research fields, including NPL growth (Ghent University, Belgium and ESPCI, Paris), optical spectroscopy (Technical University Dortmund, Germany), spectroscopy under extreme magnetic fields (HFML, Nijmegen, The Nederland) and many others. Visits to their experimental facilities will be possible and encourage.

Candidate's profile

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 candidate is expected to be self-driven, to have strong work-capacity and enthusiasm for science.

A good command of English language, with excellent oral and written skills as well as good communication skills are mandatory.

Experience in STM, AFM, electron microscopy, colloidal synthesis, UHV or confocal microscopy is a plus.

Applications are encouraged from all sectors of the community, reflecting the team’s commitment to equality and diversity. Female candidates are especially encouraged to apply.

The applicant must have an European citizenship or must have obtained his/her Master degree in Europe.

Application deadline

2020-07-15
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