Electrodeposition of Dendrimer Films with Optoelectronic Properties

HEREDIA, D.; MARZARI, G.; FERNÁNDEZ, L.; FUNGO, F.; MANGIONE, M. I.; SPANEVELLO, R. A.

La Falda

Encuentro; XII Encuentro Superficies y Materiales Nanoestructurados; 2012

FAMAF-Universidad Nacional de Córdoba

In recent years, there is an increasing interest in the design of organic materials to (that could) improve the efficiency and stability in optoelectronic devices. Organic light-emitting devices (OLEDs) together with organic photovoltaic cells are one of the technologies that have a big potential to provide solutions to the word energy deficiency. ,  Solar cells provide electricity from a sustainable energy source; while the OLEDs are low energy consumption light emitting devices. The OLED operation requires materials able to form films with charge transport (electron and hole) capability and efficient light emission. A challenge in this area of study is to improve the thermal stability of the active organic layers. Conjugated dendrimers are promising materials composed by macromolecules with highly branched three-dimensional architecture. These starburst molecules show the required characteristics for device building.  They have good charge transport properties, low energy barrier for hole injection to the anode with blocking electron injection capability. In addition, these organic molecules have a high glass-transition temperature (Tg), which is an important property to avoid the degradation through morphological changes produced by Joule effect during OLED operation. In this work, we report the synthesis of a new family of triphenylamine and carbazole derivatives with optoelectronics properties. These new electropolymerized macromolecules exhibit interesting electronic and optical properties like high hole mobility, reversible electrochemical processes, low barrier to hole injection and chemically stable thin films with homogeneous pinhole-free surface.