Temperature Imposed Sensitivity Issues of Hetero-TFET Based pH Sensor

An underlapped hetero-structure electrolyte Bio-TFET for potential of hydrogen (pH) sensing has been presented in this article. Intersection charge density ( ${text{D}_{text{it}}}$ ) near the substrate-oxide junction can be employed to represent pH value within the simulation. A feasible fabrication scheme for the proposed model is specified here. A detailed simulation is performed with an ATLAS device simulator to examine the efficiency of the projected sensor. The impact of pH alterations on device features akin to the drain current ( ${text{I}_{text{DS}}}$ ), threshold potential ( ${text{V}_{text{TH}}}$ ), sensitivity regarding voltage ( ${text{S}_{text{V}}}$ ), and current ( ${text{S}_{text{I}}}$ ) is examined. The effect of phosphate-buffered saline (PBS) concentrations on the pH buffer are also scrutinized. Moreover, the impact of the reference voltage and current ( ${text{V}_{text{Ref}}}$ and ${text{I}_{text{Ref}}}$ ), and channel doping concentration ( ${text{N}_{text{CH}}}$ ) over ${text{S}_{text{V}}}$ and ${text{S}_{text{I}}}$ is analyzed methodically. Here, ${text{S}_{text{V}}}$ attains ≈100 mV/pH, which is superior to the Nernstian limit (-
9 mV/pH) and ${text{S}_{text{I}}}$ enhances nearly ten times per pH variation. Benchmarking is included to provide a quantitative assessment of the proposed model with the published literature. The impact of temperature on pH buffer, ${text{I}_{text{DS}}}$ , temporal drift parameters and sensitivities have been emphasize...

Source: IEE Transactions on NanoBioscience - April 1, 2023 Category: Nanotechnology Source Type: research