Vertical Organic Electrochemical Transistors for Enhanced Performance and Circuit Integration

Organic electrochemical transistors (OECTs) have been intensively investigated for applications in state-of-the-art wearable electronics and next-generation biosensor technologies due to their outstanding amplification, sensitivity to ionic and ultra-small electrical potential signals, compatibility with roll-to-roll fabrication processing, and low driving voltages. The far majority of OECT studies are based on a device structure comprising coplanar source-drain electrodes in contact with the organic semiconductor. Recently we proposed a new architecture where the electrodes are vertically stacked achieving high transconductance and current on-off ratio for both p- and n-type semiconductors. This vertical OECT architecture (vOECT) is also attracting for dramatically increase transistor density for high-resolution OECT sensors and complementary driving circuits. However, scalable patterning methods for organic semiconductors and optimization of the semiconductor topology for efficient monolithic integration of vOECTs remains technologically challenging, but essential for applications in complex and high-density OECT circuit arrays and multi-functional data analysis. In this presentation we report on the monolithic integration of flexible vOECT arrays for driving high-density (> 7 M OECT/cm2) active-matrix complementary logic circuits.