Solution processed low power organic field-effect transistor bio-chemical sensor of high transconductance efficiency

Developing organic field-effect transistor (OFET) biosensors for customizable detection of biomarkers for many diseases would provide a low-cost and convenient tool for both biological studies and clinical diagnosis. In this work, design principles of the OFET transducer for biosensors were derived to relate the signal-to-noise ratio ( SNR ) to the device-performance parameters. Steep subthreshold swing ( SS ), proper threshold voltage ( V th ), good-enough bias-stress stability, and mechanical durability are shown to be the key prerequisites for realizing OFET bio-sensors of high transconductance efficiency ( g m / I D ) for large SNR . Combining a low trap-density channel and a high- k /low- k gate dielectric layer, low-temperature (