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Photoinduced charge transfer studies of type-II core-shell ZnTe-ZnSe quantum dots

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Abstract

In this communication, we discuss the photoinduced charge transfer between type-II ZnTe-ZnSe core-shell quantum dots and a molecular adsorbate methyl viologen. The oleic acid-capped core-shell nanostructures were synthesized using organometallic high-temperature route and were characterized using UV-visible absorption spectroscopy, photoluminescence spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction, inductive coupled plasma optical emission spectroscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The charge transfer behaviour of the core-shell quantum dots in the presence of methyl viologen was investigated by monitoring variations in photoluminescence and life time using steady-state and time-resolved techniques, and the results indicated static processes in the charge transfer interactions. The charge transfer capability of a core-shell system is extremely important while considering it in photovoltaic applications.

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Acknowledgements

The corresponding author V. V. Ison gratefully acknowledges SERB, DST, Govt. of India, for a fast track project (Order No. SR/FTP/PS-108/2010). The author also thanks Dr. P.R. Biju, Mahatma Gandhi University, Kottayam, for useful discussions.

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Authors and Affiliations

  1. Centre for nano bio polymer science and technology, St. Thomas College, Palai, Kottayam, Kerala, 686574, India

    Simi N. J., Anju Elsa Tom & Ison V. V.

  2. NSS Hindu College, Changanacherry, Kottayam, Kerala, 686102, India

    Vinayakan R.

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  1. Simi N. J.
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N. J., S., Tom, A.E., R., V. et al. Photoinduced charge transfer studies of type-II core-shell ZnTe-ZnSe quantum dots. J Nanopart Res 22, 135 (2020). https://doi.org/10.1007/s11051-020-04851-5

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