Low-temperature field effect in a crystalline organic material

Molecular organic materials offer the promise of unique 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 an on-off ratio up to 10⁷ at temperatures down to 100.3em0exK. Gated transport shows a factor of ~10 suppression of the thermal activation energy in the 10--500.3em0exK range and nearly temperature-independent resistivity below 100.3em0exK.