Orgatech - Organic Materials
The synthesis of multi-functional emissive, organic materials was initiated in the framework of the Orgatech platform as a new activity in 2011.
When implemented as dopant in a PMMA thin film, it emits a strong red light with a quantum yield of 80%. This is one of the highest values reported so far.
These magnetic compounds are of interest as active materials for information storage devices.
- We work on the synthesis of blue-emitting electroluminiscent materials. We have obtined Polymers with a quantum yield of 50%.
- We have synthesized various families of functionalized polymers functionalized with charge-transporting groups. They are expected to improve charge carrier transport and lead to a good balance between positive and negative charge carriers within the device, which is crucial for high electroluminescence efficiency.
- Through chemical engineering, they were anticipated to present interesting properties for designing electroluminescent devices with simplified structures and tunable colors.
- We also use conjugated polymers to promote the formation of thermodynamic stable microdomain morfologies. This approach has gained interest to solve problems related to phase separation in solar cells based on bulk heterojunction (BHJ).
- Random and diblock copolymer Poly(3-hexylthiophene) block poly[3-(3-(6-ethyl-ethoxy-pentanoate) thiophene], P3HTco- P3AcidHT and P3HT-b-P3AcidHT were designed with molecular weights of each of the two blocks that encourage well-defined nanostructures and enhance morphological stability.
- Cooperative self-assembly and favorable hydrogen bonding interactions between the COOH-functionalized block copolymers and the ester side chain of PCBM allow to form finer nano-phase separation and self-assembly into an interpenetrating network with 10–20 nm crystalline copolymer domains.
- BHJ solar cells prepared using P3HT-b P3AcidHT/PCBM exhibit a photoconversion efficiency of 4.2%, which is higher than that of reference systems: P3HT/PCBM and P3HT-co-P3AcidHT /PCBM.
- linear alkyl chain substituents promote the formation of ordered layered structures.
- branched alkyl chains lead to amorphous materials.
X-ray diffraction images of copolymers: a) P1, b) P2, c) P3 and d) P4.