Three-dimensional organic field-effect transistors using solution-processed thin films of benzothieno-benzothiophene derivatives

Organic field-effect transistors utilizing solution-processed benzothieno-benzothiophene is developed using a three-dimensional field-effect transistor structure, which comprises multiple vertical channels to enhance their output drain current. The soluble benzothieno-benzothiophene thin films were formed on vertical channels using different solvents, and the mobility is estimated to be 3.7 × 10^-3cm²/Vs. Nevertheless, extremely large values of channel width divided by length enables current amplification up to 0.7mA per device area of 1cm², even with the low carrier mobility. The result demonstrates the usefulness of the three-dimensional structure to produce high output currents for device applications.