Low temperature field-effect in crystalline organic material

TL;DR

This paper reports groundbreaking low-temperature field-effect measurements in crystalline rubrene, revealing high on-off ratios and insights into charge transport mechanisms in organic semiconductors at cryogenic temperatures.

Contribution

It presents the lowest temperature field-effect results on crystalline organic material, demonstrating significant suppression of activation energy and temperature-independent resistivity at very low temperatures.

Findings

On-off ratio up to 10^7 at 10 K

Suppressed thermal activation energy in 10-50 K range

Nearly temperature-independent resistivity below 10 K

Abstract

Molecular organic materials offer the promise of novel electronic devices but also present challenges for understanding charge transport in narrow band systems. Low temperature studies elucidate fundamental transport processes. We report the lowest temperature field effect transport results on a crystalline oligomeric organic material, rubrene. We find field effect switching with on-off ratio up to 10^7 at temperatures down to 10 K. Gated transport shows a factor of ~10 suppression of the thermal activation energy in 10-50 K range and nearly temperature independent resistivity below 10 K.