Bilayer organic field-effect transistors (OFETs) with better stability

Double active layer OFETs were fabricated, based on two-step vacuum-deposition process. Pentacene deposited at room temperature acted as the active layer, and subsequently, CuPcs was deposited above the pentacene which acted as a protecting layer for the active layer. Due to the same electrical characteristics but different morphology, the bilayer structure was effective to decrease the contamination of impurity and gas, and then improved the devices stability in the air environment.