2005/06/30 by A. N. Aleshin, А. Н. Алешин, H. J. Lee +7 · 1 citation
Engineering · Physics and Astronomy · #Molecular Junctions and Nanostructures #Organic Electronics and Photovoltaics #Quantum and electron transport phenomena #cond-mat.other #cond-mat.soft
paper · pdf · doi:10.1103/physrevb.72.153202
published as Phys. Rev. B 72, 153202 (2005) · 5 pages, 3 figures; accepted for publication in Phys. Rev. B, Brief Reports (2005)
arxiv created 2005/07/22 · openalex publication_date 2005/10/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report the low temperature current-voltage (I-V) characteristics studies in quasi-one-dimensional conducting polymer nanofibers. We find a threshold voltage Vt below which little current flows at temperatures below 30--40\phantom\rule0.3em0exK. For V>Vt current scales as (V∕Vt\ensuremath-1)^\ensuremathζ where \ensuremathζ\ensuremath∼1.8--2.1 at high biases. Differential conductance oscillations are observed whose magnitude increases as temperature decreases below 10\phantom\rule0.3em0exK. We attributed the observed low temperature I-V behavior to Coulomb-blockade effects with a crossover to Luttinger liquidlike behavior at high temperature. We demonstrate that at low temperatures such a doped conjugated polymer fiber can be considered as an array of small conducting regions separated by nanoscale barriers, where the Coulomb-blockade tunneling is the dominant transport mechanism.