Publications

2015

• Functional oxide pressure sensor
  
  • Le Bourdais D.
  • Agnus G.
  • Maroutian T.
  • Pillard V.
  • Saint-Girons Guillaume
  • Vilquin Bertrand
  • Lefeuvre E.
  • Lecoeur P.
  , 2015. Manganites are well known in the oxide community, especially La2/3Sr1/3MnO3 (LSMO) for its magnetic behavior above room temperature. In these materials, electrical conduction is due to several phenomena such as double exchange or polaronic conduction that give rise to a modulation of the material’s resistivity with the temperature. Measuring the resistance of a device can thus be a way to measure its temperature and was notably used to design bolometers working at room temperature, thanks to its high Temperature Coefficient of Resistance (TCR) close to the ferromagnetic transition. For suspended microdevices, dependence on the background gaz pressure is also observed. This phenomenon relates to the Pirani effect where the surrounding gas cools down the heated device because the local thermal conductivity depends on ambient gas pressure. Close to the ferromagnetic transition, the TCR of LSMO is almost a decade higher than Platinum making this material a good candidate for sensor application at room temperature. Additionally, the high chemical stability of manganites and their very low intrinsic electrical noise level are other arguments to use them in this field. Micro-pirani sensors were fabricated thanks to the integration of LSMO on Si with STO and YSZ buffer following by MEMS technology processes. Such oxide-based sensors exhibit sensitivity 10 times better and power consumption reduced by a factor of 100 with respect to a metallic sensor with the same geometry.
• Radial Junction Architecture: A New Approach to Stable and Highly Efficient Silicon Thin Film Solar Cells
  
  • Misra S.
  • Foldyna M.
  • Florea I.
  • Yu Lianbo
  • Roca I Cabarrocas P.
  MRS Online Proceedings Library, Cambridge University Press, 2015, 1770. (10.1557/opl.2015.831)
  DOI : 10.1557/opl.2015.831
• Spirobifluorene-2,7-dicarbazole-4'-phosphine Oxide as Host for High-Performance Single-Layer Green Phosphorescent OLED Devices
  
  • Thiery Sebastien
  • Tondelier Denis
  • Geffroy Bernard
  • Jacques Emmanuel
  • Robin Malo
  • Métivier Rémi
  • Jeannin Olivier
  • Rault-Berthelot Joëlle
  • Poriel Cyril
  Organic Letters, American Chemical Society, 2015, 17 (19), pp.4682–4685. A new host material based on the 2,7,4'-substituted spirobifluorene platform has been designed and used in single-layer phosphorescent OLED with very high efficiency (EQE = 13.2%) and low turn-on voltage (2.4 V). This performance is among the best reported for green single-layer PhOLEDs and may open new avenues in the design of host materials for single-layer devices. (10.1021/acs.orglett.5b02027)
  DOI : 10.1021/acs.orglett.5b02027
• Demonstration of full 4_4 Mueller polarimetry through an optical fiber for endoscopic applications
  
  • Manhas Sandeep
  • Vizet Jérémy
  • Deby Stanislas
  • Vanel Jean-Charles
  • Boito Paola
  • Verdier Mireille
  • de Martino Antonello
  • Pagnoux Dominique
  Optics Express, Optical Society of America - OSA Publishing, 2015, 23 (3), pp.3047. (10.1364/OE.23.003047)
  DOI : 10.1364/OE.23.003047