Department of Materials and Centre for Plastic Electronics
Imperial College London
Solution processed inorganic/organic photonic structures of low loss and tunable refractive index for use in optoelectronic devices
Location: EB1 Room 1011
Friday, February 27th 2015 - 11:00 am
An ever increasing interest in the development and application of innovative optical and optoelectronic devices places greater emphasis for the advancement of new smart and functional materials that are readily processable. Significant progress has already been realised in the fields of organic light-emitting diodes (OLEDs) and photovoltaic cells (OPVs) through development of novel semiconducting materials. Further developments in these areas are turning to the deployment of photonic structures to aid and improve light management in these systems, e.g. input-/output-coupling, enhanced absorption and wave-guiding. In this work, results from a novel class of hybrid material systems that offer an outstanding set of optical and material properties, including tunable refractive index, low optical losses and solution process ability, are presented. We show that the attributes of these novel hybrid material systems can be controlled and manipulated by a range of means that include 'alloying' or suitable post-deposition treatments, such as thermal annealing and/or irradiation with UV-light. As a consequence, these hybrid materials can exhibit refractive indices of up to 2.1 while also being highly transparent over the entire visible, near- and mid- infrared (N-IR, M-IR) wavelength regime. We demonstrate the versatility of the hybrids materials with the fabrication of dielectric Bragg reflectors for the visible and near-infra-red regime; present first results toward 2D-photonic crystals, novel grating structures and indeed use of such hybrid materials in energy harvesting/storage applications.