Electrostatically Governed Debye Screening Length at the Solution-Solid Interface for Biosensing Applications

被引:37
|
作者
Bhattacharyya, Ie Mei [1 ]
Shalev, Gil [1 ]
机构
[1] Ben Gurion Univ Negev, Beer Sheva, Israel
来源
ACS SENSORS | 2020年 / 5卷 / 01期
关键词
bioFET; field-effect; Debye screening length; immunoFET; fully depleted silicon-on-insulator; LABEL-FREE; DOUBLE-LAYER; SENSITIVITY; MODEL; ISFET;
D O I
10.1021/acssensors.9b01939
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Biosensors based on field-effect devices (bioFETs) offer numerous advantages over current technologies and therefore have attracted immense research over the decades. However, short Debye screening length in highly ionic physiological solutions remains the main obstacle for bioFET realization. This challenge becomes considerably more acute at the electrolyte-oxide interface of the sensing area due to high ion concentration induced by the charged amphoteric sites, which prohibits any attempt to employ the field-effect mechanism to "sense" any charged biomolecules. In this work, we present an electrostatic approach by which the double layer (DL) excess ion concentration is removed, thus forcing the DL ion concentration to match the bulk concentration, which subsequently forces bulk screening length at the DL, thereby "exposing" target biomolecules to the underlying bioFET. To this end, we employ local tunable surface electric fields, introduced to the DL using surface passivated-metal electrodes. We examine numerically and analytically the effect of these electric fields on the DL ion distribution. We also numerically demonstrate the feasibility of the proposed approach for a fully depleted silicon-on-insulator based bioFET and show how the threshold voltage shift induced by the presence of target molecules increases by almost two orders of magnitude upon the removal of the surface excess ion population.
引用
收藏
页码:154 / 161
页数:15
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