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Paper Details

CZTS Nanocrystals for New Generation Photovoltaic Devices

M. C. Raoa*, K. Ravindranadha, T. Srikumara, G.V. Ramanab, Y. Hanumantha Raob and T. Rose Maryc

Journal Title:Journal of Chemical, Biological and physical sciences
Abstract


Metal chalcogenide nonmaterial has interesting properties that differ from their bulk counterparts. These properties depend not only on the material of the nanoparticles but also on the size and shape of the particle as well. Spherical semiconducting metal chalcogenide nanoparticles have tunable band gaps that are dependent on the radius of the nanoparticles due to quantum confinement effects. Knowing that complex nanostructures can have advantages over simpler nanoparticles, the goal is to find simple ways to make complex nanostructures. The earth abundant chalcogenides of copper, zinc and tin make up an important class of materials toward creating low cost and sustainable thin film solar cells, with the properties of a direct band gap with a large absorption coefficient. Recently, earth abundant Cu2ZnSn(SeS)4 (CZTSeS) nanocrystals are being considered as ideal absorber materials for thin film solar cells because of a large absorption coefficient, a tunable direct band gap ranging from 1.0 to 1.5 eV and high power conversion efficiency as high as 7.2%. Oxides are ubiquitous on earth and the crust and mantle are composed very largely of oxides. All of the chemical elements apart from the lighter noble gases form compounds with oxygen and so the exploration of the structures and properties of synthetic oxides dominates much of solid-state and materials chemistry and solid-state physics. Lead chalcogenides share many physical and chemical properties in common. They are isostructural, i.e. have the same crystal structure. They can be prepared and doped by similar methods. Some lead chalcogenide alloys such as lead telluride and lead selenide are established as good thermoelectric.

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