Controlling the turn-on-voltage in low-voltage Al2O3 organic transistors with mixed self-assembled monolayers

In this paper we present a method of using blends of two silanes with different functional groups to precisely tune the turn-on-voltage to 0 V. In addition, we show how the transistor behaviour of an amorphous polymer low-voltage transistor is affected by modification of the Al2O3 dielectric with self-assembled monolayers of molecules with different functional groups. Controlling the turn-on voltage is essential for any practical applications, especially for low-voltage transistors. This method opens new doors to designing stable, low-voltage organic circuitry in a reproducible manner.

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► Turn-on-voltage (V0) sensitive to insulator/semiconductor interface properties.
► Self-assembled monolayers (SAMs) shift V0 in poly(tri-arylamine)/Al2O3 OFETs.
► The V0-shift can be controlled with SAMs of heterogeneous molecular blends.