Contact Thickness Effects in Bottom-Contact Coplanar Organic Field-Effect Transistors

Influences of contact thickness on bottom-contact and bottom-gate coplanar organic transistors are studied. In transistors with poor-quality pentacene films, thick contacts improve mobility and lower contact resistance. However, in transistors with high-quality pentacene films, thick contacts significantly degrade performance by disrupting molecular self-organization at the contact edge. These results highlight the importance of contact thickness to such organic transistors and reveal that semiconductor morphology should be considered in designing devices with minimal contact effects.