ZnO nanowires on flexible substrates for piezoelectric nanogenerators applications grown at temperatures <150C

V. E. SANTILLÁN; G. BRIDOUX; J. GUIMPEL; M. VILLAFUERTE; G. SIMONELLI

Kuala Lumpur

Conferencia; 5th International Conference on Materials Engineering and Nanotechnology; 2021

ICTEO

ZnO nanostructures were synthesized on a transparent and flexible ITO covered PET substrate, combining a lowtemperature (150 oC) pulsed laser deposition (PLD) seeding method with a hydrothermal growth. For comparison, anITO/glass substrate seeded with a spin coated solution heat treated at 330 oC was also used for the hydrothermal growth.The resulting structures were studied by scanning electron microscopy, X-ray diffraction and room temperaturephotoluminescence. Wurtzite ZnO nanowires (NWs) were revealed, with an improved coverage of the substrate in the caseof the substrate seeded by PLD. Preferential c orientation of the structures was obtained, with a misalignment of ± 12o and± 7o for PLD and spin coating seeding processes, respectively. A device was fabricated with the NWs grown on theITO/PET substrate to evaluate its piezoelectric response. The corresponding I-V curve presented a Schottky behavior.Current pulses of ≈ 1 nA were generated when the device was pressed, changing sign when it was released, as expected forthe piezoelectric generation phenomenon.