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Ludovic Tortech

Ludovic Tortech

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Maître de Conférences / Assistant Professor, Université Pierre et Marie Curie

 


Contact :
Tel: +33 1 69 08 65 56

Ludovic.tortech@upmc.fr


CEA de Saclay

DSM – IRAMIS – NIMBE,

Bat 462, pièce 7

91191 Gif sur Yvette


Academic research team :

Edifices PolyMétalliques (E-POM)

CEA (Alternative Energies and Atomic Energy Commission) research team:

Laboratoire d'Innovation en Chimie des Surfaces et Nanosciences (LICSEN)

 

µ-CV

2006- : assistant professor, université Pierre et Marie Curie, Institut Parisien de Chimie Moléculaire (IPCM)

2004-2006: Post-doctoral fellow on surface modification and adhesion properties, Collège de France

2003-2004 : Post-doctoral fellow on tribological and mechanical properties at interfaces, ESPCI (Engineer scientific school) in Paris

2000-2003 : PhD thesis, Synthesis of highly fluorinated compounds for electrical and tribological applications, Université de Nice-Sophia Antipolis

1999 : Master of Science, Université Paris-Sud

Short presentation

Ludovic Tortech was recruited as assistant professor by the university Pierre et Marie Curie, UPMC, (part of the consortium “Sorbonne Université”) to work at the CEA (in an academic group of IPCM) on eltronic molecular and more specifically organic photovoltaic.

At the beginning of 2014 he has joined the e-POM research team of UPMC and later the LICSEN. The re-enforce the collaboration between the university and CEA a consortium agreement was signed. He is sharing his time between the teaching activities and research.

 

Research Topics

The different topics of research deal with:

            1/ Synthesis of original organic molecules

            2/ Thin films elaboration and characterization

            3/ Organic thin film for organic spintronic

            4/ 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.

Topic 1

We developed the synthesis of original organic1,2 (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:

 

Topic 2

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 atonic 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

 

Topic 3

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 valve4,5.

 

Topic 4

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

 

 

Supervision and funding

Since the beginning of his research activities 3 PhDs under his supervision were defend in the thematic of organic solar cells. In parallele several fellow BC’s and Masters have performed their laboratory training with us.

In 2013 the région île de France, across C’Nano DIM Nano K funded the PhD of Qirong Zhu (2013-2016) for a collaborative project (coll. Anna Proust PhD Director and Nick Barrett)

In 2014 the LabEx Michem funded a collaborative project (coll. LCPMR, François Rochet, Jean-jacques gallet and Fabrice Bournel) to finance the PhD grant of Quentin Arnoux. the physics consortium of the plateau de Saclay (RTRA) has funded a collaborative spintronic project (coll. Jean-Baptiste Moussy and Talal Mallah).

 

Teaching

192 hours of teaching is due to university and dispatched from bachelor to graduate leveling in:

Ø  Organic chemistry : undergraduate

Ø  Photovoltaic cells: graduate and master level

Reference

(1)    Bertrand, G.; Tortech, L.; Fichou, D.; Malacria, M.; Aubert, C.; Gandon, V. An Improved Protocol for the Synthesis of [(η4-C4R4)Co(η5-C5H5)] Complexes. Organometallics 2012, 31, 126–132.

(2)    Berny, S.; Tortech, L.; Véber, M.; Fichou, D. Dithiapyrannylidenes as Efficient Hole Collection Interfacial Layers in Organic Solar Cells. ACS Appl. Mater. Interfaces 2010, 2, 3059–3068.

(3)    Alaaeddine, M.; Zhu, Q.; Fichou, D.; Izzet, G.; Rault, J. E.; Barrett, N.; Proust, A.; Tortech, L. Enhancement of Photovoltaic Efficiency by Insertion of a Polyoxometalate Layer at the Anode of an Organic Solar Cell. Inorg. Chem. 2014, 1, 682–688.

(4)    Blouzon, C.; Ott, F.; Tortech, L.; Fichou, D.; Moussy, J.-B. Anti-Ferromagnetic Coupling in Hybrid Magnetic Tunnel Junctions Mediated by Monomolecular Layers of Α-Sexithiophene. Appl. Phys. Lett. 2013, 103, 042417.

(5)    Berny, S.; Tortech, L.; Fichou, D.; Matzen, S.; Moussy, J.-B. Organic-Inorganic Magnetic Tunnel Heterojunctions Based on Dithiapyrannylidene Ultrathin Films Grown on Fe[sub 3]O[sub 4](111). Appl. Phys. Lett. 2010, 97, 253303.

(6)    Bertrand, G. H. V.; Tortech, L.; Gandon, V.; Aubert, C.; Fichou, D. Synthesis and Photovoltaic Performances in Solution-Processed BHJs of Oligothiophene-Substituted Organocobalt Complexes [(η4-C4(nT)4)Co(η5-C5H5)]. Chem. Commun. 2014, 50, 8663–8666.

 

 

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