Institut des
NanoSciences de Paris
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Research activities

The Optoelectronic of Confined Nanomaterial (OCN) team is focused on the study of nanomaterials in order to correlate their structural properties with their electronic structure and their transport properties. On a more applied side, we aim to develop new optoelectronic devices in particular photodetectors based on these materials.

1. Narrow band gap nanocrystals
1.1. Synthesis of narrow band gap and semimetal nanocrystals

The group is working on the synthesis of narrow band gap and semimetal nanoparticles. We in particular try to take benefit from intraband transitions in the IR as a new design path for colloidal heterostructure


Left : Tem image of nanocrystal. Right Infrared spectra of doped nanocrystals

associated publications :

  • Terahertz HgTe nanocrystals : beyond confinement, N. Goubet, A. Jagtap, C. Livache, B. Martinez, H. Portales, X. Zhen Xu, R.P.S.M. Lobo, B. Dubertret, E. Lhuillier, J. Am. Chem. Soc. 140, 5033(2018).
  • Infrared photo-detection based on colloidal quantum-dot films with high mobility and optical absorption up to the THz, E. Lhuillier, M. Scarafagio, P. Hease, B. Nadal, H. Aubin, X. Z. Xu, N. Lequeux, G. Patriache, S. Ithurria, B. Dubertret, Nano Lett 16, 1282 (2016).

1.2. Infrared colloidal optoelectronic

We use these narrow band gap nanomaterials to develop the next generation of low cost infrared devices. We in particular interest to the study of these material in a phototransistor to study their photoconduction properties under field effect.

Associated publications :

  • Band Edge Dynamics and Multiexciton Generation in Narrow Band Gap HgTe Nanocrystals, C. Livache, N. Goubet, B. Martinez, A. Jagtap, J. Qu, S. Ithurria, M. G. Silly, B. Dubertret, E. Lhuillier, ACS Appl. Mater. Interfaces 10, 11880–11887 (2018).
  • Effects of electron-phonon interactions on the electron tunneling spectrum of PbS quantum dots H. Wang, E. Lhuillier, Q. Yu, A. Mottaghizadeh, C. Ulysse, A. Zimmers, A. Descamps-Mandine, B. Dubertret, and H. Aubin, Phys. Rev. B 92, 041403(R) (2015).
2. Transport in Nanocrystal films and their gating
The field effect transistor has become the most versatile strategy to study the transport properties of nanocrystal film. The goal is to overcome conventional gating through thin dielectric such as SiO2 which is conventionally used, but present some drawbacks such as a large leakage or limited carrier density modulation (<1013cm-2). This part of the research activity aim to develop new gating methods able to achieve large carrier density, low temperature operability in particular using electrolyte gating

Left scheme of an electrolytic transistor where the channel is based on nanocrystals. Right : Transistor transfer curve

Associated publications :

  • Strategy to overcome recombination limited photocurrent generation in CsPbX3 nanocrystal arrays, W. J. Mir, C. Livache, N. Goubet, B. Martinez, A. Jagtap, A. Chu, N. Coutard, H. Cruguel, T. Barisien, S. Ithurria, A. Nag, B. Dubertret, A. Ouerghi, M. G. Silly, E. Lhuillier, Appl. Phys. Lett. 112, 113503 (2018).
  • Metallic functionalization of CdSe 2D nanoplatelets and its impact on electronic transport, B. Mahler, L. Guillemot, L. Bossard-Giannesini, S. Ithurria, D. Pierucci, A. Ouerghi, G. Patriarche, R. Benbalagh, E. Lacaze, F. Rochet, E. Lhuillier, J. Phys Chem C 120, 12351-12361(2016).
  • Investigating the n and p type electrolytic charging of colloidal nanoplatelets, E.Lhuillier, S. Ithurria, A. Descamps-Mandine, T. Douillard, R. Castaing, X.Z. Xu, P-L. Taberna, P. Simon, H. Aubin, B. Dubertret, J Phys Chem C 119, 21795 (2015).
3 Hybrid 2D system
The group also interest to 2D system based on graphene, transition metal dichalcogenides and colloidally grown nanocrystals. Combining 2D atomically flat system such as graphene or MoS2 for their exceptional transport properties with nanocrystal for their optical feature is a very active field of research where transport phenomena between the different materials still need to be better understood. We in particular use the transport and phototransport as a probe to get information on the charge transfer process at the layer scale. This activity is conducted in collaboration with Abdelkarim Ouerghi from C2N.

Left scheme of an hybrid system based on graphene functionalized with colloidal flakes. Right : Transistor transfer curve of graphene based phototransistor

Associated publications :

  • Large area molybdenum disulphide epitaxial graphene vertical Van der Waals heterostructures, D. Pierucci, H. Henck, H. Sediri, E. Lhuillier, A. Balan, J. E. Rault, Y. J. Dappe, F. Bertran, P. Le Fevre, A. Ouerghi, Sci. Rep 6, 26656 (2016).
  • Engineering the Charge Transfer in all 2D Graphene-Nanoplatelets Heterostructure Photodetectors, A. Robin, E. Lhuillier, X. Z. Xu, S. Ithurria, H. Aubin, A. Ouerghi, and B. Dubertret, Sci. Rep 6, 24909 (2016).


Images of some devices

Keywords : nanocrystal, quantum dot, low dimension, infrared, optoelectronic, photodetection, transport, semimetal, narrow band gap, 2D, merury chalcogenides


TEM image of colloidal nanocrystals