Role of contacts in carbon nanotube giant piezoresistive sensors
From the perspective of wafer-level integration technologies, this work presents theoretical and experimental insights on fundamental device properties of single-walled carbon nanotubes (SWCNTs) based giant piezoresistive transducers. The role of contacts in such devices and their contribution to a significant tunneling-related sensitivity enhancement is demonstrated. The origin of this phenomenon is the strain dependence of the effective Schottky barrier (SB) width, which is modulated by a drain-source voltage (V DS ) dependent large built-in electric field F at the Schottky barrier. Moreover, perspectives for forthcoming sensor generations exposing operation regimes beyond intrinsic sensitivity are revealed.