Publication date: 2nd November 2020
The development of piezoelectric nanogenerators with high output power generation in order to drive microelectronic devices is a great challenge till now due to the high internal resistance of the piezoelectric materials. In this work, the influence of the factors like morphology of the nanostructures, work function of the electrode material and electrode configuration on the piezoelectric voltage generation as well as the internal resistance of the nanogenerators have been studied. Piezo-electric polycrystalline Pb(Zr0.52Ti0.48)O3 (PZT) tetragonal nanostructures of different morphology grown by hydrothermal technique were used as the generating material. Morphology dependent piezoelectric characteristics of the nanostructured PZT revealed that the nanowires with tip diameter up to 10 nm enhanced the output voltage generation significantly. The increase in output voltage generation by lowering the barrier height at the nanowires film and electrode junction has been studied. Scaling of electrode by connecting four interdigitated electrode in parallel improved the charging capability of the nanogenegator which can charge a super-capacitor up to 5.5V within 40 sec. It has also been observed that a bilayer electrode (In-Ag) with barrier height 0.6 eV, increased the voltage generation to 8.8 V and also the power output achieved up to 2 mW with a concomitant reduction of internal resistance. Thus an effective and novel pathway has been established for the development of piezoelectric nanowires based nanogenerators with high output power generation.
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