Article Title

Ionic effects on the transport characteristics of nanowire-based FETs in a liquid environment

Authors

Daijiro Nozaki, Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
Jens Kunstmann, Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany Department of Chemistry, Columbia University, 3000 Broadeway, New York, NY 10027, USA
Felix Zrgiebel, Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
Sebastian Pregl, Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
Larysa Baraban, Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
Walter M. Weber, NaMlab gGmbH, Nthinger Str. 64, 01187 Dresden
Thomas Mikolajick, NaMlab gGmbH, Nthinger Str. 64, 01187 Dresden
Gianaurelio Cuniberti, Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany Center for Advancing Electronics Dresden (cfAED), TU Dresden, 01062 Dresden, Germany Dresden Center for Computational Materials Science (DCCMS), TU Dresden, 01062 Dresden, Germany

Keywords

nanowire field effect transistors (FETs), biosensors, silicon nanowires, Poisson–Boltzmann theory, Landauer model

Abstract

For the development of ultra-sensitive electrical bio/chemical sensors based on nanowire field effect transistors (FETs), the influence of the ions in the solution on the electron transport has to be understood. For this purpose we establish a simulation platform for nanowire FETs in the liquid environment by implementing the modified Poisson–Boltzmann model into Landauer transport theory. We investigate the changes of the electric potential and the transport characteristics due to the ions. The reduction of sensitivity of the sensors due to the screening effect from the electrolyte could be successfully reproduced. We also fabricated silicon nanowire Schottky-barrier FETs and our model could capture the observed reduction of the current with increasing ionic concentration. This shows that our simulation platform can be used to interpret ongoing experiments, to design nanowire FETs, and it also gives insight into controversial issues such as whether ions in the buffer solution affect the transport characteristics or not.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-013-0404-9

Publisher

Tsinghua University Press

Recommended Citation

Daijiro Nozaki,Jens Kunstmann,Felix Zörgiebel,Sebastian Pregl,Larysa Baraban,Walter M. Weber,Thomas Mikolajick,Gianaurelio Cuniberti, Ionic effects on the transport characteristics of nanowire-based FETs in a liquid environment. NanoRes.2014, 7(3): 380–389