Institut des
NanoSciences de Paris
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Research activities

The Optoelectronic of Confined Nanomaterial team (ocn) 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 for developing new optoelectronic devices in particular photodetector 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 (lead chalcogenides) and semimetal (mercury chalcogenides compound with optical properties in the infrared. We also aim to develop new materials with similar optical feature but with reduced toxicity. This part of the activity is conducted in close collaboration with Sandrine Ithurria at laboratory LPEM at ESPCI.

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

associated publications :

  • 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).
  • Synthesis of Colloidal HgTe Quantum Dots for Narrow Mid-IR Emission and Detection, S. Keuleyan, E. Lhuillier and P. Guyot-Sionnest, J. Am. Chem. Soc. 133, 16422 (2011).

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 :

  • 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).
  • Electrolyte gated colloidal nanoplatelets based phototransistor and its use for bicolor detection, E. Lhuillier, A. Robin, S. Ithurria, H. Aubin, B. Dubertret, Nano Lett. 14, 2715(2014).
  • Mid-Infrared HgTe/As2S3 FETs and photodetectors, E. Lhuillier, S. Keuleyan, P. Zolotavin and P. Guyot-Sionnest, Adv. Mat. 25, 137 (2013).
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
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Left scheme of an electrolytic transistor where the channel is based on nanocrystals. Right : Transistor transfer curve

Associated publications :

  • 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).
  • Nanoplatelets Bridging a Nanotrench : A New Architecture for Photodetectors with Increased Sensitivity, E. Lhuillier, J.F. Dayen, D. O. Thomas, A. Robin, B. Doudin, B. Dubertret, Nano Lett 15, 1736 (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 LPN.
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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).




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Images of some devices

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

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TEM image of colloidal nanocrystals