Piezoelectric Nanogenerator Using p-Type ZnO Nanowire Arrays
journal contributionposted on 11.03.2009, 00:00 by Ming-Pei Lu, Jinhui Song, Ming-Yen Lu, Min-Teng Chen, Yifan Gao, Lih-Juann Chen, Zhong Lin Wang
Using phosphorus-doped ZnO nanowire (NW) arrays grown on silicon substrate, energy conversion using the p-type ZnO NWs has been demonstrated for the first time. The p-type ZnO NWs produce positive output voltage pulses when scanned by a conductive atomic force microscope (AFM) in contact mode. The output voltage pulse is generated when the tip contacts the stretched side (positive piezoelectric potential side) of the NW. In contrast, the n-type ZnO NW produces negative output voltage when scanned by the AFM tip, and the output voltage pulse is generated when the tip contacts the compressed side (negative potential side) of the NW. In reference to theoretical simulation, these experimentally observed phenomena have been systematically explained based on the mechanism proposed for a nanogenerator.