Energy Harvesting Using Piezoelectric Nanowires–A Correspondence on “Energy Harvesting Using Nanowires?” by Alexe et al.

Authors

  • Zhong Lin Wang

    Corresponding author
    1. School of Materials Science and Engineering Georgia Institute of Technology Atlanta, GA 30332-0245 (USA)
    • School of Materials Science and Engineering Georgia Institute of Technology Atlanta, GA 30332-0245 (USA).
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Abstract

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A response to the questions raised by Alexe et al. concerning nanowire-based nanogenerators is presented. Evidence is given about the existence and detection of a piezoelectric potential in ZnO nanowires. The role played by the piezoelectric potential is to overcome the threshold voltage at the Pt–ZnO junction, while the observed output signal of ∼10 mV is the difference in Fermi levels between the two electrodes. The measurement system used by Alexe et al. is questioned, as is their model.

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