4: Polymer Electronic Materials & Devices

The LCPO Team 4 is headed by Georges Hadziioannou and involves Karim Aïssou, Cyril Brochon, Eric Cloutet, Guillaume Fleury, and Eleni Pavlopoulou. This group is the core of the Arkema/ANR industrial chair “HOMERIC” – Hierarchical assembled Organic Materials for ElectRonICs.

Block Copolymers for Advanced Lithographic and Storage Applications

This research topic involves Karim Aïssou, Guillaume Fleury and Georges Hadziioannou.

Perfectly ordered microstructures with nanometrically defined periodicity offer promising opportunities in microelectronic applications and nanotechnologies. To produce long-range ordered two-dimensional arrays inherent to such technologies, the combination of the block copolymer “bottom-up” self-assembly with “top-down” guiding patterns has been successfully introduced leading to new technological breakthroughs.

 

 

We develop copolymers for their application in directed self-assembly (DSA) targeting materials addressing the needs of the microelectronic industry. Subsequently we study the self and directed assemblies of these materials in the thin film configuration in order to understand the parameters governing their phase behavior. Besides we develop methodologies for the production of the guiding patterns needed for the production of the long range order arrays.
Since 2010 a strong partnership with Arkema company, CEA-Leti and LTM (Laboratoire des Technologies de la Microélectronique) was built up in order to tackle the challenge inherent to the direct self-assembly of block copolymers for nanolithography. This collaboration led to the development of a first generation of lithographic materials based on the DSA of PMMA-b-PS and PMMA-s-PS copolymers.
Please see the publication pages for a detailed description of our most recent research projects.

Synthesis and Design of Functional Materials for Organic Electronics

Our research targets the design and synthesis of new functional polymers and copolymers, destined to be used in organic electronic devices. Depending on the target application, an integrated characterization of these materials and their formulations (ink, thin film, bulk) is performed, before their incorporation in the corresponding devices. The resultant structure/function relationships are explored and the acquired knowledge is exploited to further optimize our materials.

 

Ferroelectric Materials for Storage and Energy Applications

This research topic involves Eleni Pavlopoulou and Georges Hadziioannou.
This is a new activity in our group that targets the incorporation of ferroelectric polymers in organic electronic devices. Due to the dipoles inherent to their structure, ferroelectric polymers can be electrically active or responsive.

 

 

Our efforts are oriented towards the exploitation of this merit to conceive and implement novel electronic devices. Our industrial partner, Arkema, is a valuable collaborator in this effort by contributing with their experience on the synthesis and formulation of fluoro-polymers.

 

Please see the publication pages for a detailed description of our most recent research projects.

Electrophoretic inks for “Electronic paper”

This research topic involves Cyril Brochon and Georges Hadziioannou.
Electrophoretic Displays (or electronic paper) are low cost and low energy displays. They are based on an electrophoretic ink encapsulated between two electrodes (one is transparent). The inks are usually made of black and white particles with opposed electric charges which will move toward one or the other electrode depending on the applied field and change the color of the display.
In the group, we are working on the synthesis and characterization of new core-shell multi-functional particles and their formulation as inks. Our three main challenges are:

• The development of simple and direct synthetic process for multi-functional particles. We focus more particularly on the development of “one-pot” processes leading to ink formulations of well-defined particles in order to eliminate further processing steps in the ink elaboration.

 

• The synthesis of colored particles by using various inorganic pigments or organic dyes during the particles synthesis.

 

• The development of magneto- and electro-phoretic particles in order to develop four color inks using two different triggers (electrophoresis and magnetophoresis).
Please see the publication pages for a detailed description of our most recent research projects.

Semiconducting Organic Polymers for Energy and Lighting

Thermoelectricity
This research topic involves Guillaume Fleury and Georges Hadziioannou.
Thermoelectric systems are very effective in harvesting electricity from waste heat or heat sources with low temperature gradients relative to the environmental temperature. However typical thermoelectric semiconductor materials are expensive and relatively difficult to process, impeding their widespread use for energy conversion. In this regard, polymer nanocomposites are very attractive as they generally require relatively simple manufacturing processes. Besides, the poor thermal conductivity intrinsic to polymers and the advent of the “Organic Electronic” have led us to strongly consider the use of polymer nanocomposites for thermoelectric applications.

 

In this project we focus our work on the elaboration of composites materials based on conductor polymers or block copolymers which are able to disperse by tailored interactions conductive nanoparticles. The obtained thermoelectric nanocomposites are then studied as regards to their physical and thermal properties for further optimization.
Please see the publication pages for a detailed description of our most recent research projects.

π-conjugated polymers and copolymers for organic electronics
This research topic involves Cyril Brochon, Eric Cloutet and Georges Hadziioannou.
In our group, two kinds of active materials are studied:
– New surfactants and additives for active layer stability and process-ability enhancement. These surfactants are based on block copolymer with various architectures composed of at least one π-conjugated segment.
– New π-conjugated polymers with enhanced absorption in visible light, towards red and infrared wave length.

 

 

Regarding the π-conjugated part we have expertise in polymerizing a large variety of monomer units such as derivatives of thiophene, carbazole, squaraine, phenylene vinylene, etc. by addition and condensation polymerizations.
While for the non-conjugated segment, in close collaboration with our industrial partner Arkema, we develop metal-free polymerization routes (such as nitroxide mediated radical polymerization) or more conventional ones, such as anionic polymerization, of a large palette of (meth)acrylate, or vinylic monomers.
Please see the publication pages for a detailed description of our most recent research projects.

Organic conductive inks

This research topic involves Eric Cloutet and Georges Hadziioannou.

The search for novel electrode materials with good stability, high transparency, low roughness and excellent conductivity is a crucial challenge for optoelectronics and organic electronics in particular.

 

 

Our approach is based on the preparation of specific formulations based on semi-conducting (co)polymers by using appropriate solvents and additives. Depending on formulation and processing conditions we can vary the figure of merit sDC/sOP from 5 to 15. We are currently investigating more efficient new organic based solutions that could be easily transferred in large scale using industrial techniques thanks to our partner Arkema.

Please see the publication pages for a detailed description of our most recent research projects.

ELORPrinTec EquipEx

ELORPrintTec is a platform founded by the national Investisments for the Future with specific equipments dedicated to organic polymer electronics.

 

Clean room ISO6 fully equipped with chemical, physicochemical and printing processing tools for the organic electronic polymer materials: synthesis, formulation, processing and their integration to devices and systems.

PUBLICATIONS BY THIS TEAM

Publications of the LCPO Team 4 “Polymer Electronic Materials & Devices” according to the HAL database.

Read more: PUBLICATIONS BY THIS TEAM