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ZnO thin¯lms were prepared onto the glass substrates by the solÀgel spin coating method for various Zn concentrations and at di®erent spin rates. The in°uence of concentration of zinc and spin rate on the structural and optical properties of the ZnO thin¯lms were investigated. It was observed that the zinc concentration and spin rate in°uence the grain size and morphology of the ZnO thin lms. The optical band gap energy was found to increase with decrease of Zn concentration and increase in spin speed. The photoluminescence peaks show green radiation at $485 nm. It was also observed that the enrichment of zinc and variation in spin speed in°uence the intensity of luminescence peaks.

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Sclerosing stromal tumor (SST) is an extremely rare, benign distinctive ovarian sex cord stromal tumor. The tumor occurs predominately in the second and third decades of life. Due to the presence of both solid and cystic components with rich vascularity,it can be mistaken for malignant ovarian tumors on ultrasonography and other radiological investigations. Distinctive histopathological features and immunohistochemistry(IHC) conrms the diagnosis. Proper diagnosis of SST is important, which prevents extensive surgical intervention done in cases of ovarian malignancy. Herein, we report clinical and histopathological features of SST in a 23year old female who presented with complaints of intermenstrual bleeding associated with abdominal pain and underwent laparoscopic cystectomy. It is imperative to consider sclerosing stromal tumor as one of the differential diagnosis in young females presenting with complex ovarian mass. Frozen section analysis could be done intraoperatively to rule out malignancy, so that conservative surgery can be performed