The research line SEMICONDUCTING NANOWIRES AND NANOSTRUCTURES aims at developing and exploring the chemical synthesis and properties of ZnO nanowires and related heterostructures combining them with direct band gap semiconductors for a large number of nanoscale engineering devices in the fields of optoelectronics and piezoelectricity.
We work on the elucidation and control of the nucleation and growth mechanisms of ZnO nanowires grown by chemical bath deposition by coupling an experimental approach with a fundamental approach based on thermodynamic computations . These mechanisms are investigated on a large number of nucleation surfaces, from the polycrystalline ZnO seed layer grown by sol-gel process (i.e. dip coating) [3,6] or MOCVD to the ZnO single crystal  through to the metallic seed layer. A special emphasis is further made on the development of the selective area growth of these nanowires by technological processes in a cleanroom environment using advanced lithography (i.e. electron-beam assisted lithography, nanoimprint lithography, …) . The properties of these ZnO nanowires are also investigated in details and optimized with the current aim of controlling their doping as much as possible [11,15] and the effects related to their oxygen or zinc polarity by using advanced characterization techniques [8,10,14].
We also develop the synthesis of direct band gap semiconductors by chemical bath deposition , SILAR, and ALD, for their combination with the ZnO nanowires in core-shell heterostructures. This allows us to form type II p-n heterojunctions with a high added value. A strong relationship with David Munoz-Rojas and Jean-Luc Deschanvres (i.e. FunSurf Team) occurs in that framework.
The present fundamental work on the synthesis and properties of these nano-objects benefits from a number of ongoing collaborations and has a direct interest for the applicative field. The devices currently under investigation are extremely thin absorber solar cells , self-powered UV photodetectors , light emitting diodes, piezoelectric nano-generators or also pressure sensors.
ANR DOSETTE (2018-2021, coordinateur) Type: Research National Agency, young investigator call Title: Ordered ZnO nanowire-based type II heterostructures for self-powered UV photodetectors
ANR ROLLER (2018-2021, collaborator) Type: Research National Agency, collaborative program call Title: Resistive, unipolar and ordered ZnO nanowire arrays for flexible sensors adapted to biological media Partenship: Institut Néel (Grenoble), INL (Lyon), LGEF (Lyon)
ECOLED (2017-2019, coordinator) Type: Institut Carnot Energies du Futur Title: New generation of eco-efficient white LEDs : coupling of ZnO UV LEDs with aluminoborate phosphors Partenship : Institut Néel (Grenoble)
Swansea University, South Wales
Tallinn University of Technology, Estonia
Aristotle University of Thessaloniki, Greece
Institut Jaume Almera, Spain
Cambridge University, England
Written by Maria Carmen Jimenez Arevalo
Date of update May 11, 2018
Research Nanomaterials and advanced heterostructures (NanoMAT)