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

作　　者：Daijiro Nozaki Jens Kunstmann Felix Zorgiebel Sebastian Pregl Larysa Baraban Walter M. Weber Thomas Mikolajick Gianaurelio Cuniberti 

机构地区：[1]Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany [2]Department of Chemistry, Columbia University, 3000 Broadeway, New York, NY 10027, USA [3]NaMlab gGmbH, N6thinger Str. 64, 01187 Dresden [4]Center forAdvancing Electronics Dresden (cfAED), TU Dresden, 01062 Dresden, Germany [5]Dresden Center for Computational Materials Science (DCCMS), TU Dresden, 01062 Dresden, Germany

出　　处：《Nano Research》2014年第3期380-389,共10页纳米研究（英文版）

摘　　要：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.

关 键 词：nanowire field effecttransistors （FETs） biosensors silicon nanowires Poisson-Boltzmann theory Landauer model 

分 类 号：TN386[电子电信—物理电子学] TN304.12