New Generation Materials and Structures for Nanophotonics and Nanoelectronics

摘要

This DURINT project produced high impact technical accomplishments. The notable accomplishments include building (i) new nanostructures, (ii) study of optoelectronic and magnetic properties, and (iii) fabrication of polymer based non-linear based photonic crystals and photonic circuitry, and (iv) fabrication of photodetctor as well as diffraction grating devices. On the preparation front, a modular colloidal route was devised to produce nano- heterostructures by integrating plasmonic (Au), magnetic (Fe3O4) and semiconducting (PbS or PbSe) moieties into a single platform. The properties of each component within the hybrids were strongly modulated by the conjugating component(s), due to the coherent interfaces between them. New ferromagnetic (low temperature) InMnP nanoparticles were synthesized. Far IR and Raman spectroscopies revealed additional vibrational features related to Mn-P vibrations that could help locate the Mn sites in the crystal. For photodetector devices, an organic/inorganic polymeric nanocomposite consisting of poly-N-vinyl carbazole(PVK), lead selenide quantum dots(QDs) as photosensitizer and organic semiconductor pentacene as a conductivity booster, was constructed. The device exhibits dramatic enhancement of infrared photocurrent.