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Shape Effect on Electronic and Photovoltaic Properties of CdS Nanocrystals

Mazumdar, Sayantan and Bhattacharyya, Aninda J (2012) Shape Effect on Electronic and Photovoltaic Properties of CdS Nanocrystals. In: JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 12 (8). pp. 6308-6314.

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Official URL: http://dx.doi.org/10.1166/jnn.2012.6432


Changes in electronic and photovoltaic properties of semiconductor nanocrystals predominantly due to changes in shape are discussed here. Cadmium sulfide (CdS) semiconductor nanocrystals of various shapes (tetrapod, tetrahedron, sphere and rod) obtained using an optimized solvothermal process exhibited a mixed cubic (zinc blende) and hexagonal (wurtzite) crystal structure. The simultaneous presence of the two crystal phases in varying amounts is observed to play a pivotal role in determining both the electronic and photovoltaic properties of the CdS nanocrystals. Light to electrical energy conversion efficiencies (measured in two-electrode configuration laboratory solar cells) remarkably decreased by one order in magnitude from tetrapod -> tetrahedron -> sphere -> rod. The tetrapod-CdS nanocrystals, which displayed the highest light to electrical energy conversion efficiency, showed a favorable shift in position of the conduction band edge leading to highest rate of electron injection (from CdS nanocrystal to the wide band gap semiconductor viz, titanium dioxide, TiO2) and lowest rate of electron-hole recombination (higher free electron lifetimes).

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Scientific Publishers
Keywords: Semiconductor Nanocrystals; Shapes; Cadmium Sulfide; Mixed Crystallographic Phases; Solar Cells; Electron-Hole Recombination Lifetimes
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Dec 2012 10:09
Last Modified: 12 Dec 2012 10:09
URI: http://eprints.iisc.ac.in/id/eprint/45176

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