We discuss the device performances of triboelectric pressure sensors (TEPSs) using GaN nanowires (NWs) as a response medium. TEPSs were fabricated by stacking polydimethylsiloxane directly on GaN NWs formed on Si(111) and forming an electrode underneath the substrate. When hammering the TEPS with a finger, the output voltage was measured to be 14.7 V, which is 2.5 times higher than that (5.9 V) of the TEPS without GaN NWs. The output voltage of TEPSs rarely changed even after the 100-cyclic measurements. These results will be discussed using an analytical model with the spatial electrostatic induction of GaN NWs.
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