A study based on two-dimensional percolation theory yielding quantitative parameters for optimum connectivity of transparent single-wall carbon nanotube (SWNT) thin films is reported. Optimum SWNT concentration in the filtrated solution was found to be 0.1 mg/L with a volume of 30 ml. Such parameters lead to SWNT fractions in the films of approximately Φ = 1.8 × 10 -3, much below the metallic percolation threshold, which is found to be ∼Φ c = 5.5 × 10 -3. Therefore, the performance of transparent carbon nanotube thin-film transistors is limited by the metallic SWNTs, even below their percolation threshold. We show how this effect is related to hopping or tunneling between neighboring metallic tubes.
|Original language||English (US)|
|Number of pages||6|
|State||Published - Apr 2006|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering