The Effect of Carbon Nanotube/Organic Semiconductor Interfacial Area on the Performance of Organic Transistors

TL;DR

This study demonstrates that increasing the interfacial area between carbon nanotubes and pentacene significantly enhances organic transistor performance, including mobility and current ratios.

Contribution

It introduces a method to improve organic transistor performance by anchoring SWCNTs at various densities to increase interfacial area.

Findings

Mobility increased up to nine times with higher SWCNT density.

On-off ratio improved up to 40 times.

Device performance explained by reduced barrier height at the interface.

Abstract

We show that the performance of pentacene transistors can be significantly improved by maximizing the interfacial area at single walled carbon nanotube (SWCNT)/pentacene. The interfacial areas are varied by anchoring short SWCNTs of different densities (0-30/{\mu}m) to the Pd electrodes. The average mobility is increased three, six and nine times for low, medium and high SWCNT densities, respectively, compared to the devices with zero SWCNT. The current on-off ratio and on-current are increased up to 40 times and 20 times with increasing the SWCNT density. We explain the improved device performance using reduced barrier height of SWCNT/pentacene interface.