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

Temperature variation of the current–voltage characteristics of polyacetylene nanofibres as a result of phonon-assisted tunnelling process

“…At low temperatures (below 30 K) the I -V data of these nanofibres were independent of temperature and were consistent with Zenertype tunnelling [6]. At higher temperatures the I -V characteristics being temperature-dependent deviated from Zener-type behaviour, so for an explanation of these characteristics the fluctuation-induced tunnelling model proposed by Sheng [7], including thermal activation over the tunnelling barriers, by the authors [5] has been invoked.…”

“…Independence of the conductivity of temperature below 30 K is due to relatively high magnitude of the phonon energy taking part in the tunnelling process (hω = 12 meV, 30×k B ∼ 3 meV). Thus, at low temperatures the phonons are 'frozen out' and a merger of I -V characteristics as conductivity independence of temperature is observed [3][4][5]. The density of localized charge carriers taking part in a conduction process, as derived from the fit of experimental data to the theory, is equal to be about 10 16 cm −3 .…”

“…quantum-mechanical phonon-assisted tunnelling theory, the temperature-and field-dependent conductivity in some organic materials has been successfully explained [10,11]. Therefore, in this paper we present an explanation of both temperaturedependent and temperature-independent I -V characteristics of polyacetylene nanofibres from [4,5] employing the model based on phonon-assisted tunnelling theory.…”

“…Recently Park et al [1][2][3] and Kaiser et al [4,5] have presented experimental results on the current-voltage (I -V ) characteristics of polyacetylene nanofibres in a wide temperature range. The peculiarities of I -V characteristics were strong nonlinearity for lightly-doped samples at low temperatures and nearly ohmic behaviour for higher temperatures.…”

A Review on Electronic Transport Properties of Individual Conducting Polymer Nanotubes and Nanowires

“…The current-voltage (I-V) characteristics of individual polymer nanowires/tubes such as the polyacetylene, polyaniline, polypyrrole, and PEDOT have been explored extensively in the past ten years Park et al, 2003;Kaiser et al, 2002Kaiser et al, , 2003Kaiser et al, & 2004Long et al, 2005b). With lowering temperature, a transition from linear to nonlinear I-V characteristics is usually observed (Fig.…”