Unusually strong space-charge-limited current in thin wires

Details Unusually strong space-charge-limited current in thin wires Unusually strong space-charge-limited current in thin wires

2008-08-13

arxiv.org/abs/0808.1914v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.076802

The current-voltage characteristics of thin wires are often observed to be nonlinear, and this behavior has been ascribed to Schottky barriers at the contacts. We present electronic transport measurements on GaN nanorods and demonstrate that the nonlinear behavior originates instead from space-charge-limited current. A theory of space-charge-limited current in thin wires corroborates the experiments, and shows that poor screening in high aspect ratio materials leads to a dramatic enhancement of space-charge limited current, resulting in new scaling in terms of the aspect ratio.

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