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    Size-Dependent Exciton Recombination Dynamics in Single CdS Nanowires beyond the Quantum Confinement Regime
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    † Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
    ‡ Division of Microelectronics, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798
    § Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
    ∥ Singapore-Berkeley Research Initiative for Sustainable Energy, 1 Create Way, 138602, Singapore
    *E-mail: [email protected]
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2013, 117, 20, 10716–10722
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    https://doi.org/10.1021/jp312850w
    Published April 20, 2013
    Copyright © 2013 American Chemical Society
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    Abstract

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    A deep understanding of the size, surface trapping, and scattering effects on the recombination dynamics of CdS nanowires (NWs) is a key step for the design of on-demand CdS-based nanodevices. However, it is often very difficult to differentiate these intertwined effects in the NW system. In this article, we present a comprehensive study on the size-dependent exciton recombination dynamics of high-quality CdS NWs (with diameters from 80 to 315 nm) using temperature-dependent and time-resolved photoluminescence (TRPL) spectroscopy in a bid to distinguish the contributions of size and surface effects. TRPL measurements revealed two distinct processes that dominate the band edge recombination dynamics—a fast decay process (τ1) originating from the near-surface recombination and a slower decay process (τ2) arising from the intrinsic free exciton A decay. With increasing NW diameters, τ1 increases from ∼0.10 to ∼0.42 ns due to the decreasing surface-to-volume ratio of the NWs, whereas τ2 increases from ∼0.36 to ∼1.21 ns due to decreased surface scattering in the thicker NWs—as validated by the surface passivation and TRPL studies. Our findings have discerned the interplay between size and surface effects and advanced the understanding of size-dependent optoelectronic properties of one-dimensional semiconductor nanostructures for applications in surface- and size-related nanoscale devices.

    Copyright © 2013 American Chemical Society

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    A schematic of the out-coupling efficiency and FTIR spectra. This material is available free of charge via the Internet at http://pubs.acs.org.

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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2013, 117, 20, 10716–10722
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jp312850w
    Published April 20, 2013
    Copyright © 2013 American Chemical Society
    Request reuse permissions

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