Abstract
This paper presents a cascade-type compact hybrid energy cell (CHEC) that is capable of individually and concurrently harvesting solar and strain energies. The cell is made up of an n-p homojunction nanowire (NW)-based piezoelectric nanogenerator and a nanocrystalline/amorphous-Si:H single junction cell. Under optical illumination of ~10mW/cm2 and mechanical vibration of 3m/s2 at 3Hz frequency, the output current and voltage from a single 1.0cm2-sized CHEC, 280μA and 3.0V, respectively, are sufficient to drive low-power commercial electronics. Six such CHECs connected in series generate enough electrical power to light emitting diodes or drive a wireless strain gauge sensor node.
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