Papers by Keyword: Semiconducting Materials

Abstract: Semiconducting materials are important photonic materials and the technologies developed have been utilized in many fields of the modern society and they are closely related to the quality of our life. The main applications of the materials are for light source and sensing originated from interaction of photons and matters. In this invited talk, I will first present our work on the properties of the semiconducting materials and their applications as lasers and photodetectors, and then present integrated hybrid subwavelength structures which show significant enhancement on device performance. It is believed that complex hybrid structures which combine quantum-and hetero-structures made of semiconducting materials, and subwavelength structure for performance enhancement are the main focus in the near future.

Abstract: Single phase CuO films have been successfully synthesized by thermal oxidation of cupper foil in air with water vapor. The structural and optical properties of CuO films were investigated. It is observed that the grain size increases with increasing the oxidation temperature. The optical band gap of CuO film is determined by the transmittance and reflectance spectra.

Abstract: High quality cuprous oxide thin films with large grain size were grown by thermal oxidation of copper foil in water vapor with N₂ gas. It was found that in water vapor (111) oriented Cu₂O is preferentially formed, whereas mixtures of random oriented CuO and Cu₂O are formed when oxidized in air. The effects of the film oxidation method and heating temperature are investigated. In addition, the optical band gaps of cuprous oxide thin films have been determined by measuring the transmittance and reflectance spectra.

Abstract: Cubic Cu₂O nanoparticles were synthesized via hydrothermal route without template. The study of different reaction conditions reveals that the concentrate of NaOH affects the size and the morphology of nanocubes.

Abstract: Recently, numerous semiconducting materials and its composites are studied for their photocatalysis applications. These materials having different size, shape and controlled morphology in micro, meso and nanoscale exhibits various important surface features having remarkable applications in photocatalytic degradation of toxic pollutants, hydrogen production and adsorbent for wastewater treatment. However different methods are followed to synthesis semiconductors, metal supported/loaded semiconductors, heterostructures, graphene based semiconductors and other newer materials. In addition, the surface morphologies of these materials and composites for its photo catalytic processes can be explained. Finally the photophysical properties of semiconductor and composite materials with unusual texture will be summarized.

Abstract: Copper sulfide (CuS) nanocrystals with flower-like and tubular morphology have been successfully synthesized via a facile and convenient hydrothermal route at 75 °C by using CuCl2·2H2O as Cu-precursor, C2H5NS as S-source and CTAB as template molecules. The effect of concentration of reactants and template molecules on morphology has been discussed. X-ray diffraction pattern suggests that the CuS crystals are pure hexagonal phase. The morphology of the products has been studied by scanning electron microscope analysis. The absorption peaks of CuS in UV and near-IR regions indicate that the as-prepared CuS are promising in the development of photoelectric devices.

Abstract: Tin dioxide is a wide band semiconductor, with interesting chemical physical and mechanical properties, used in a variety of industrial, domestic, medical and agricultural applications, including gas detectors, transparent conductors, solar cells, anti-static films, nanoelectronic devices etc. The variety of nanosized SnO2 production methods in the form of powders or layers (e.g. solid state, sol-gel, sputtering, laser ablation, template, solution precipitation, precursor oxidation, CVD, PVD, etc) are discussed.