KEYWORDS: Sensors, Optical sensors, Zinc oxide, Signal processing, Signal generators, Signal detection, Thin films, Solar cells, Electron transport, Nanorods
Here we report a flexible piezoelectric nanodevices (nanogenerators) that can be utilized as both a touch sensor and a
light sensor on a single platform. Based on the electron transporting and piezoelectric properties of ZnO, nanogenerators
with a ZnO/conjugated polymer stacked structure was designed on a plastic substrate. Piezoelectric touch signals were
demonstrated under independent and simultaneous operations with respect to photo-induced charges (photodetection).
Different levels of piezoelectric output signals from different magnitude of touching pressures suggest new user-interface
functions from our hybrid nanogenerators. From a signal controller, the decoupled performance of a hybrid
nanogenerator as a touch sensor and a light sensor was confirmed. Our hybrid approach does not require additional
assembling processes for such multiplex systems of a touch sensor and a light sensor since we utilize the coupled
material properties of ZnO and output signal processing. Moreover, it should be noted that the hybrid nanogenerator can
be operated in a self-powered mode without any power supply.
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