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11 September 2008 Investigation of structural and optical properties of CdSe quantum dots in glass matrices for photovoltaic application
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In this work preparation methods for spin-cast uniform layers of cadmium selenide (CdSe) quantum dots (QDs) with specific thickness and subsequent film treatment methodologies are presented. Dimensional and lattice structures as well as the homogeneity of the nanocrystals distribution over the film thickness are studied through high resolution transmission electron microscopy (HRTEM). Ultra violet (UV) spectrometric and spectrofluorometric measurements are performed to obtain absorption-emission spectrum of the provided films. The results show that the absorption is sensitive to size of the nanocrystals and the refractive index of the medium in which they are embedded. Refractive index of the thin films is extracted using spectroscopic Ellipsometery. Results are presented on the incorporation of the CdSe in glass matrices and a graded index structure is optimized for embedment of nanocrystals. The photon conversion ability of the fabricated layer has been verified. Effect of size and glass matrix contraction on the Raman shifts of CdSe quantum dots has been also investigated. The results from such characterization methods are vital in knowing the properties of the nanocrystals, as well as in optimizing a converter layer for solar cell applications.
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Bahareh Sadeghimakki and Siva Sivoththaman "Investigation of structural and optical properties of CdSe quantum dots in glass matrices for photovoltaic application", Proc. SPIE 7047, Nanoscale Photonic and Cell Technologies for Photovoltaics, 70470W (11 September 2008);

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