Carrier Density and Schottky Barrier on the Performance of DC Nanogenerator
- 18 December 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 8 (1), 328-332
- https://doi.org/10.1021/nl0728470
Abstract
By assembling a ZnO nanowire (NW) array based nanogenerator (NG) that is transparent to UV light, we have investigated the performance of the NG by tuning its carrier density and the characteristics of the Schottky barrier at the interface between the metal electrode and the NW. The formation of a Schottky diode at the interface is a must for the effective operation of the NG. UV light not only increases the carrier density in ZnO but also reduces the barrier height. A reduced barrier height greatly weakens the function of the barrier for preserving the piezoelectric potential in the NW for an extended period of time, resulting in little output current. An increased carrier density speeds up the rate at which the piezoelectric charges are screened/neutralized, but a very low carrier density prevents the flow of current through the NWs. Therefore, there is an optimum conductance of the NW for maximizing the output of the NG. Our study provides solid evidence to further prove the mechanism proposed for the piezoelectric NG and piezotronics. The output current density of the NG has been improved to 8.3 μA/cm2.Keywords
This publication has 10 references indexed in Scilit:
- Coaxial silicon nanowires as solar cells and nanoelectronic power sourcesNature, 2007
- Integrated Nanogenerators in BiofluidNano Letters, 2007
- Direct-Current Nanogenerator Driven by Ultrasonic WavesScience, 2007
- NanopiezotronicsAdvanced Materials, 2007
- ZnO tetrapod Schottky photodiodesApplied Physics Letters, 2006
- Piezoelectric and Semiconducting Coupled Power Generating Process of a Single ZnO Belt/Wire. A Technology for Harvesting Electricity from the EnvironmentNano Letters, 2006
- Piezoelectric Nanogenerators Based on Zinc Oxide Nanowire ArraysScience, 2006
- ZnO Nanobelt/Nanowire Schottky Diodes Formed by Dielectrophoresis Alignment across Au ElectrodesNano Letters, 2006
- Growth of Uniformly Aligned ZnO Nanowire Heterojunction Arrays on GaN, AlN, and Al0.5Ga0.5N SubstratesJournal of the American Chemical Society, 2005
- Measuring Thermal and Thermoelectric Properties of One-Dimensional Nanostructures Using a Microfabricated DeviceJournal of Heat Transfer, 2003