N-type Organic Field Effect Transistor Using Densely Aligned Carbon Nanotube Array Electrodes*

We present fabrication of n-type organic field effect transistors (OFETs) using densely aligned array carbon nanotube (CNT) electrodes. The CNTs were aligned with a high linear density via dielectrophorosis (DEP) from an aqueous solution. In order to fabricate the CNT electrodes, aligned CNTs were cut by electron beam lithography (EBL) and precise oxygen plasma etching. The OFETs were fabricated in a bottom-contact configuration by depositing a thin film of C60 molecules between the CNT source and drain electrodes, and compared against a controlled OFET with gold electrodes. The room temperature electron transport measurements of the OFETs using CNT electrodes show better transistor characteristics compare to OFETs using gold electrodes due to improved charge injection from densely aligned and open-ended nanotube tips.