Shape Effect on Electronic and Photovoltaic Properties of CdS Nanocrystals

Mazumdar, Sayantan ; Bhattacharyya, Aninda J. (2012) Shape Effect on Electronic and Photovoltaic Properties of CdS Nanocrystals Journal of Nanoscience and Nanotechnology, 12 (8). pp. 6308-6314. ISSN 1533-4880

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

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

Abstract

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:Article
Source:Copyright of this article belongs to American Scientific Publishers.
ID Code:116843
Deposited On:20 May 2021 05:24
Last Modified:20 May 2021 05:24

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