Double buffer circuit for the characterization of piezoelectric nanogenerators based on ZnO nanowires

Abstract : The accurate and precise measurements of voltage and current output generated by a nano-generator (NG) is crucial to design the rectifying/harvesting circuit and to evaluate correctly the amount of energy provided by a NG. High internal impedance of the NG's (several MΩ) is the main limiting factor for designing circuits to measure the open circuit voltage. In this paper, we present the influence of the characterization circuit used to measure the generated voltage of piezoelectric NGs. The proposed circuit consists of a differential amplifier which permits to measure the voltage provided by the NG without applying any parasitic bias to it. The proposed circuit is compared to a commercial electrometer and a homemade buffer circuit based on a voltage follower circuit to show its interest. For the proposed double buffer circuit, no asymmetric behavior has been noticed contrary to the measurements made using simple buffer circuit and Keithley electrometer. The proposed double buffer circuit is thus suitable to measure the NG voltage in a transparent way, as an ideal voltage probe should do.
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Kevin Nadaud, François Morini, Abhishek Dahiya, Camille Justeau, Sarah Boubenia, et al.. Double buffer circuit for the characterization of piezoelectric nanogenerators based on ZnO nanowires. Applied Physics Letters, American Institute of Physics, 2018, 112 (6), pp.063901. ⟨10.1063/1.5018145⟩. ⟨hal-01727273⟩

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