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Study of relaxation dynamics of photogenerated excitons in CuInS2 quantum dots

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Abstract

CuInS2 (CIS) quantum dots (QDs) with different diameters were prepared and their optical properties were studied. The optical band gap of QDs, as estimated by absorption spectrum, was found to decrease with increase in size. The stokes shift between absorption and photoluminescence peaks was observed to be larger (>100 meV) in all the three samples. This shows that the defect states available in the forbidden gap dominates the recombination mechanism. The variation in the emission peak with QD size, however, indicates that the relaxation dynamics in CIS QDs involves both excitonic level as well as the defect states.

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Acknowledgments

The financial support from the Department of Science and Technology, India is gratefully acknowledged. The authors also acknowledge the University Science Instrumentation Centre, University of Delhi, India for TEM and EDAX measurements.

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Authors and Affiliations

  1. Department of Electronics, SGTB Khalsa College, University of Delhi, Delhi, 110007, India

    Inderpreet Singh

  2. Department of Electronic Science, University of Delhi South Campus, New Delhi, 110021, India

    S. Madan, A. Kaur, J. Kumar, P. K. Bhatnagar & P. C. Mathur

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  1. Inderpreet Singh
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  2. S. Madan
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  3. A. Kaur
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  4. J. Kumar
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  5. P. K. Bhatnagar
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Correspondence to Inderpreet Singh.

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Singh, I., Madan, S., Kaur, A. et al. Study of relaxation dynamics of photogenerated excitons in CuInS2 quantum dots. MRS Communications 4, 1–5 (2014). https://doi.org/10.1557/mrc.2014.5

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