Unique Inorganic/Organic Nanocomposites for Infrared Applications

摘要

This report results from a contract tasking Queen Mary College London as follows: This project will explore the properties of formulations deemed to be most promising in terms of, for example, uniformity of particle size and distribution. The study of carrier transport through nanocomposite hybrid structures is of fundamental interest. The mechanism is strongly affected by the charge transfer between different phases within the material and energy level quantisation. A specially designed electrode system fabricated on a silicon substrate will be used for this purpose.. Steady state conduction through samples before and after H2S treatment will be investigated at different temperatures ranging from liquid nitrogen to room temperature both under dark and illuminated conditions. Measurement will provide physically meaningful information regarding the generation-recombination mechanism and the role of PbS nanoparticles. For particles with size in the order of 2 nm, as observed in our preliminary work, we would expect to observe Coulomb blockade phenomena in the room temperature I/V characteristics. This would be an important aspect for future investigations into developing nanotechnological devices. Capacitance voltage characteristics will be obtained to determine the location and type of potential barrier. Macroscopic measurements will also be undertaken in order to investigate charge carrier separation mechanisms in the PbS/phthalocyanine composites. The influence of annealing on the I-V characteristics will also be examined. The reverse breakdown voltage will be monitored in order to test the stability of the structure. Low frequency current and voltage noise measurements will be carried out on nanoparticle PbS films, providing quality assessment of nanocrystalline films.