Variation with temperature of the I–V characteristics of polyacetylene nanofibres

✍ Scribed by A.B. Kaiser; T.M. Iorns; J.G. Park; B. Kim; S.H. Lee; Y.W. Park

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 144 KB
• Volume: 2
• Category: Article
• ISSN: 1567-1739
• DOI: 10.1016/s1567-1739(02)00110-4

✦ Synopsis

The current-voltage (I-V ) characteristics of individual nanofibres of doped polyacetylene show a dramatic change from very strong nonlinearities for lightly-doped samples at low temperatures, to nearly ohmic behaviour for higher temperatures and doping levels. At low temperatures (below 10-30 K), the I-V characteristics are independent of temperature and follow the expression for Zener-type tunnelling, as predicted for field-induced tunnelling of the conjugated bond system. At higher temperatures, the I-V characteristics deviate from Zener-type behaviour and the current increases with temperature as thermally-assisted conduction mechanisms become important. The I-V characteristics for the most conductive sample are consistent with our calculations of fluctuation-induced tunnelling.