Synthesis,Characterization And Optical Properties Of SnS Nanomaterial

Resources, environment and population issues are three major problems in our modern society, and energy resources is a top priority. The solar energy is an infinite, inexhaustible clean energy. Because of the much advantage of solar energy:Safe, reliable, no noise, no pollution, without geographical restrictions, no fuel consumption, no mechanical transmission parts, low failure rate, easy to maintain, suitable for unattended, short construction period, the size can be easily controlled, and can be easily combined with buildings, very substantial economic benefits, it has received much attention of the world's scientists. The first generation of solar cell used single crystal silicon and polycrystalline silicon as the absorbing layer, the basis of second generation of solar cell is thin film. Third-generation of solar cells requires the absorbing layer is thin film, the elements of this film are abundant and non-toxicity. Because of tin sulfide (SnS) has ideal band gap, Sn and S are rich reserved in Earth as well as non-toxic. It becomes the first choice for solar energy conversion film. In this thesis, under the background of the preparation and application of the SnS films, and with the emphasis of SnS nano-functional materials'Preparation and Characterization, we reported the different morphological SnS nano-materials and its optical absorption properties. The main contents of the study and the results are as follows:1. We report a successful deposition of SnS thin films though elementary process by CVD at different temperatures. Different morphologies of plate and granular structure were obtained at different temperatures at the fixed distance between source and substrate (DSS). photoluminescence (PL) shows a strong ultraviolet-violet luminescence band was observed when the preparing temperature is 975℃and DSS= 175mm. With the patterns of absorbance A we get the point that the band gaps of the films are increase with the temperature increased. From the EDS pattern we get Sn:S atom ratios increased when the prepared temperature increased.2. Maintaining a certain temperature while DSS was changed the transformation of morphology from plate-like to granule-like has been observed. Typical high-resolution (HRTEM) figures show that the products prepared at low temperature were single crystal while the films made in high temperature are polycrystal.