Synthesis and Properties of Metal Oxide Semiconductor and Hybrid Organic Inorganic Nanomaterials

Abstract

The wide band gap TiO2 has properties such as higher exciton binding energy, good newlineelectrical conductivity and high transparency in the visible light region which makes it newlinepreferable material for applications in optoelectronic devices. These devices require newlinesynthesis of good quality TiO2 thin films and nanocrystals. It is well known that p-n newlinejunction or diode is the basic building block for any electronic device. It is also known newlinethat the undoped TiO2 has a good intrinsic n-type conductivity which can be further newlineimproved by doping. The efficient p-type doping of TiO2 has yet to be achieved. newlineThe nanocrystals have higher scope of functionalization due to the higher surface-tovolume newlineratio and three dimensional quantum confinements of electrons and excitons. newlineThe functionalization of TiO2 nanocrystals may be achieved by making its hybrid newlinenanocomposite with an organic material. Inorganic-organic hybrid nanocomposites newlineintegrate the useful inorganic and organic characteristics within a single composite. newlineThese nanocomposites are expected to exhibit unique electronic and optical newlineproperties. In view of the foregoing, the aim of the thesis is to understand the basic newlinescience of the synthesis, characterization and sensitization of various morphologies of newlineTiO2 with CdSe quantum dots and poly[2-methoxy-5-(2 -ethylhexyloxy)-p-phenylene newlinevinylene] (MEHPPV). Apart from this transient absorption studies of CdSe-MEHPPV newlineheterojunctions have been done in order to explore the charge transport kinetics.