| An overview is fist given on the study of solar cell materials development all over the word, and set forth the properties and study status in quo of the main solar cell materials. Particular recommend recent development of FeS2 photovoltaic thin film. Compared to the traditional preparation routs, the solvothermal method is one of the most promising intermediate-temperature synthetic techniques to synthesize stoichiometric pyrite powders. In this work, an improved solvothermal method is developed to synthesize pyrite powder. The single-phase pyrite has been successfully obtained both in acidic environment (pH=5) and under alkali condition (pH=10), using polyvinyl pyrrolidone (PVP) as surfactant and alcohol-water as solvent. The crystal growth mechanisms in different environments were illuminated, respectively. On the basis of series sample of pH value, the influence of pH value on the crystal structure was analyzed. Here, the MAUD program was used to model crystal microstructure of the typical sample. The XRD results showed that, the optimal pH value is 5 in acidic environment and 10 under alkali condition, respectively. From the SEM determination, polyhedral shaped sample with a size of 1.3μm was synthesized at pH 5, while about 300nm spherical FeS2 crystal was obtained at pH 10. The optical analysis indicated that the quantum confinement effect of nanocrystalline FeS2 is sensitive to the pH value, and the absorption edge shifts towards the blue region with the pH value augmenting. Special attention has been paid to investigate the influences of temperature and reaction time on the crystal structural and optical characteristics of the nanocrystalline FeS2 synthesized under acidic condition. After refined the typical sample, the accurate...
|
PDF Full Text Request