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Optical Properties of CdS and CdTe Sensitized ZnO Nanorods

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Abstract

Optical properties of ZnO-CdTe electrochemically prepared on a core-shell nanostructure (NS) were studied. Numerical simulations based on effective medium approximation give higher absorption than ZnO-CdS samples and a sensitive dependence on CdTe content. The absorption edges for deep black samples found by transmittance (T(λ)) and diffuse reflectance (Rdiff(λ)) measurements were at 1.33eV and 1.55eV, respectively. A split-off band edge was also found by Rdiff(λ) at ∼2.5eV. The red shift observed in T(λ), previously observed in ZnO-CdS, and may confirm the enhancement of sub-bandgap absorption due to the NS nature of samples.

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Acknowledgments

CSIC (Comisión Sectorial de Investigación Científica) of the Universidad de la República; ANII (Agencia Nacional de Investigación e Innovación); PEDECIBA–Física, in Uruguay. Junta de Andalucía, Project P07-FQM-02573 in Spain.

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Authors and Affiliations

  1. Instituto de Física & CINQUIFIMA, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay

    C.J. Pereyra, F. Ferrer, R.E. Marotti, C. Gómez, L. Campo, L.I. Amy & E.A. Dalchiele

  2. Lab. de Materiales y Superficies (Unidad Asociada al CSIC), Dptos. de Física Aplicada & Ingeniería Química, Universidad de Málaga, Campus de Teatinos s/n, E29071, Málaga, Spain

    F. Martín, D. Leinen & J.R. Ramos-Barrado

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  1. C.J. Pereyra
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  2. F. Ferrer
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  3. R.E. Marotti
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  9. J.R. Ramos-Barrado
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  10. E.A. Dalchiele
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Pereyra, C., Ferrer, F., Marotti, R. et al. Optical Properties of CdS and CdTe Sensitized ZnO Nanorods. MRS Online Proceedings Library 1707, 19–25 (2014). https://doi.org/10.1557/opl.2014.577

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  • DOI: https://doi.org/10.1557/opl.2014.577

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