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Open Access Nano Express

Negative Differential Resistance in ZnO Nanowires Bridging Two Metallic Electrodes

Yang Zhang1* and Ching-Ting Lee2

Author Affiliations

1 Institute of Physics for Microsystems and Department of Physics, Henan University, No. 1 Jinming Road, Kaifeng, Henan, 475004, China

2 Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, Tainan, 70101, Taiwan

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Nanoscale Research Letters 2010, 5:1492-1495  doi:10.1007/s11671-010-9667-1

Published: 13 June 2010

Abstract

The electrical transport through nanoscale contacts of ZnO nanowires bridging the interdigitated Au electrodes shows the negative differential resistance (NDR) effect. The NDR peaks strongly depend on the starting sweep voltage. The origin of NDR through nanoscale contacts between ZnO nanowires and metal electrodes is the electron charging and discharging of the parasitic capacitor due to the weak contact, rather than the conventional resonant tunneling mechanism.

Keywords:
Negative differential resistance; ZnO nanowires; Electrical transport