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Groupe d’Optique des nanoStructures Semiconductrices > Spectroscopy and recombination dynamics ;
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SpeRe

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Puce Presentation

An essential tool supporting the development of new materials and structures for opto-electronic devices is the characterization and detailed understanding of their optical properties. The spectroscopy and recombination dynamics (SpeRe) activity in LPN-GOSS aims at providing fine spectroscopic information on all kind of semiconductor structures using low temperature photoluminescence (PL), excitation spectroscopy (PLE), photocurrent spectroscopy or optical absorption over a very broad spectral domain (0.7 eV – 3 eV), as well as information on the recombination dynamics using a time resolved set-up (4ps temporal resolution). Reactivity and openness to emerging topics, within LPN and beyond, are the key words of this service to the community, that also includes modeling of the results using dedicated tools, in particular a versatile transfer-matrix code. Recent studies involve new materials based on III-V semiconductors (quantum dots, ultrashort period superlattices, nanowires…) as well as more exotic materials like hybrid organic-inorganic perovskites. Time resolved spectroscopy is also an important tool to assess the quality of materials for laser applications and to test the side effects of processing, for instance non radiative recombination due to etching damages.

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Hybride perovskites

K. Gauthron et J. Bloch,LPN-GOSS

E. Deleporte et J.-S. Lauret, LPQM - ENS Cachan


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InAsP/InP nanowires

K. Gauthron et P. Voisin, LPN-GOSS

J.-Ch. Harmand, LPN-ELPHYSE

J.-M. Jancu, FOTON-INSA Rennes


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Ultrashort period superlattices

P. Voisin, A. Talneau et K. Gauthron, LPN-GOSS

J.-Ch. Harmand et G. Patriarche, LPN-ELPHYSE

J.-M. Jancu, FOTON-INSA Rennes


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Puce Members

Contacts

 Voisin Paul  (+33) 1 69 63 61 93  

And also...

 Bloch Jacqueline  (+33) 1 69 63 61 90  
 Harmand Jean-Christophe  (+33) 1 69 63 60 81  
 Sagnes Isabelle  (+33) 1 69 63 61 71  

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Puce Publications

Publication in journals
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Puce Contracts and projects

    Puce International Projects

      ILNACS : Nanostructures of Compound Semiconductors (Growth, properties, devices)

      Reference contract : Laboratoire International Associé (LIA) CNRS - Université de Montpellier - INSA Toulouse / Académie des Sciences de Russie - Fondation Russe pour la Recherche Fondamentale
      LPN leader(s): Frank Glas
      Main goals : Organize and develop scientific collaborations between the CNRS laboratories and the laboratories and institutes of the Russian Academy of Sciences based in Saint Petersburg in the domains of growth and study of the physical properties of nanostructures of compound semiconductors, and of compounds based on the latter.
      (2010-2017)

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    Puce ANR non thématiques

      PEROCAI : Perovskite in microcavities

      Reference contract : ANR Blanc 2010 (ANR-10-04)
      Coordinator, Partner(s) : E. Deleporte (LPQM ), J. Even (FOTON ), P. Audebert (PPSM )
      LPN leader(s): Jacqueline Bloch, Sophie Bouchoule
      Main goals : Vertical microcavities in the light-mater strong coupling are intensively studied due to the interest in coherent and stimulated effects in such systems as polariton lasing and Bose Einstein condensation in the solid phase. These effects have been recently demonstrated in “classical” inorganic semiconductors and most of the physics is done at low temperature. Until now, attempts to study these physical processes with molecular materials have failed.In this draft, we propose to use organic-inorganic molecular quantum wells inside a vertical microcavity to demonstrate stimulated effects at room temperature. The molecular quantum wells used in this study belong to the perovskite family. Because the strong coupling regime in vertical microcavities containing perovskites has been achieved at room temperature and because of the wide tunability of its exciton perovskite material is a good candidate to realize vertical microcavities and study these polaritonic effects. The physics of these new polaritons is unexplored. Therefore, polariton relaxation efficiency and dynamics will be studied. Finally, experiments designed to observe stimulated effects on these polariton states will be performed. Partners : LPQM-ENS Cachan (project leader), LPN, PPSM-ENS Cachan, FOTON-INSA Rennes (2010-2014)

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Puce Past and current Internship Training

Post-docs


  • Cavity polaritons in perovskite semiconductors

  • H. S. Nguyen-(2011-11-01 / 2013-10-30)
    Contact : J. Bloch
    Group : Optic of Semiconductor nanoStructures Group (GOSS)
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    Cavity polaritons in inorganic semiconductors are currently widely investigated, in particular in our group, because of their unique non-linear properties. Parametric oscillation with ultra-low threshold and polariton lasing (an analoguous to Bose condensation) is achieved. This opens a vast research field, both from the fundamental and applied point of view. In most of the cases, these experiments are performed at cryogenic temperatures. Recently the strong coupling regime has been demonstrated in semiconductor microcavities containing hybrid organic/inorganic active layer, based on perovskites. This new material presents very robust excitons enabling the observation of the strong coupling regime at room temperature and with record Rabi splitting. Within an ANR project in collaboration with the group of E. Deleporte at LPQM, ENS Cachan, we are currently exploring the potential of this new material.

Internship Training

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