Thèmes de Recherche :

Molecular Electronic – Organic solar cells – organic synthesis – thin film desposition – thin film properties

Recherche actuelle :

• Synthesis of original organic molecules
• Thin films elaboration and characterization
• Organic thin film for organic spintronic
• Fabrication and characterization of organic solar cells

The objectives are to go in deeper and better understanding in the electronic processes in the electronic molecular devices we study.

Résultats Récents :

We developed the synthesis of original organic^1,2 (and organo-metallic) molecules principally used as interfacial layer to inject electron onto the p-type of the active layer of organic solar cells.

Among the molecules synthesized some structures are :

We are deposing molecules (or metal) onto substrates, principally ITO on glass. At the laboratory we are equipped of a high vacuum thermal evaporator and a spin-coater into a set of gloves box.
The layer at first are characterized using an atomic force microscope either in classical contact mode or electrical and contact. This last mode allows to access to electrical and electronical out of the plane of thin layers such as in the 2 examples below :

• Example 1² : 20 nm of DITPY onto ITO in current sensing AFM

• Example 2³ : 140 nm of POM, K₆[P₂W₁₈O₆₂], onto ITO, left is topography and right is current mapping

In collaboration with Jean-Baptiste Moussy, from SPEC (CEA), we are developing original multilayer structures based on the structure metal/orga/metal to elaborate spin valve^4,5

The ending of synthesizing molecules and depositing it is to make devices. At the end most of the devices are photovoltaic cells. The cells are tested using an optical bench of measurement in the dark, under white illumination (100mW/cm²) and monochromatic light.

• Example 1⁶ : integration of CpCoCb as p-type (in association to PCBM) giving 1.9% (2.1%@20mW)

• Example 2 : 20 nm thin film of DITPY as interfacial at the anodic surface of a P3HT:PCBM organic solar cell exhibiting almost 3% and proved to be an efficient hole collector to compensate the charge accumulation in P3HT

Parcours Scientifique:

• 2006- : Assistant Professor 
  UPMC, IPCM
• 2004-2006 : Post-doctoral fellow 
  Collège de France, Paris
  Surface modification and adhesion properties
• 2003-2004 : Post-doctoral fellow 
  Ecole Supérieure de Physique et de Chimie Industrielle, Paris
  Tribological and mechanical properties at interfaces
• 2000-2003 : PhD thesis
  Université de Nice – Sophia Antipolis, Nice
  Synthesis of highly fluorinated compounds for electrical and tribological applications

Choix de publications :

1. Structural and Electronic Properties of 2,2′,6,6′-Tetraphenyl-Dipyranylidene and Its Use as a Hole-Collecting Interfacial Layer in Organic Solar Cells
   M. Courté ; M. Alaaeddine ; V. Barth ; L. Tortech ; D. Fichou
   Dyes Pigments, 2017, 141, 487–492
2. X-Ray Microscopic Investigation of Molecular Orientation in a Hole Carrier Thin Film for Organic Solar Cells
   Q. Arnoux ; B. Watts ; S. Swaraj ; F. Rochet ; L. Tortech
   Nano Res., 2017, 1–12.
3. Energy-Level Alignment of a Hole-Transport Organic Layer and ITO : Toward Applications for Organic Electronic Devices
   Q. Arnoux ; A. Boucly ; V. Barth ; R. Benbalagh ; A. Cossaro ; L. Floreano ; M. Silly ; F. Sirotti ; E. Derat ; S. Carniato ; F. Bournel ; J.-J. Gallet ; D. Fichou ; L. Tortech ; F. Rochet 
   ACS Appl. Mater. Interfaces,  2017, 9 (36), 30992–31004.
4. Engineering the Magnetic Coupling and Anisotropy at the Molecule-Magnetic Surface Interface in Molecular Spintronic Devices
   V. E. Campbell ; M. Tonelli ; I. Cimatti ; J.-B. Moussy ; L. Tortech ; Y. J. Dappe ; E. Riviere ; R. Guillot ; S. Delprat ; R. Mattana ; P. Seneor ; P. Ohresser ; F. Choueikani ; E. Otero ; F. Koprowiak ; V. G. Chilkuri ; N. Suaud ; N. Guihery ; A. Galtayries ; F. Miserque ; M.-A. Arrio ; P. Sainctavit ; T. Mallah 
   Nat. Commun., 2016, 7, 13646.
5. Use of Cobalt Complexes for Preparing an Active Layer in a Photovoltaic Cell, and Corresponding Photovoltaic Cell
   C. Aubert ; G. Bertrand ; D. Fichou ; V. Gandon ; M. Malacria ; L. Tortech
   ES2542084 (T3) WO2012131257 (A1), July 30, 2015.
6. Synthesis and Photovoltaic Performances in Solution-Processed BHJs of Oligothiophene-Substituted Organocobalt Complexes (Η4-C4(NT)4)Co(Η5-C5H5)
   G. H. V. Bertrand ; L. Tortech ; V. Gandon ; C. Aubert ; D. Fichou 
   Chem. Commun., 2014, 50 (63), 8663–8666.