Patent ID: 9638659
Date: 2017-05-02
CPC Classifications: G01N,H01L

Claim:
1. A method for fabricating a nanowire field-effect sensor comprising nanowires having a network structure, the method comprising the steps of: (a) forming on a bulk silicon substrate an active region, which includes a nano-network, a source electrode region and a drain electrode region, by a lithography process and an etching process; (b) forming a bottom insulating layer for insulating between the active region and the bulk silicon substrate, in a region between sidewalls of the nano-network, which excludes the active region, in such a manner that a bottom portion of each of the source electrode region and the drain electrode region is maintained connected to the bulk silicon substrate and a bottom portion of the nano-network is completely insulated from the bulk silicon substrate; (c) implanting impurity ions into the source electrode region and the drain electrode region in order to increase an electrical conductivity of the source electrode region and the drain electrode region; (d) forming a gate insulating layer on a pin vertically arranged on each sidewall of the nano-network in order to control a gate of the nanowire field-effect sensor; (e) forming an electrode metal layer on the source electrode region and the drain electrode region, and forming a submerged gate electrode on the bulk silicon substrate in order to apply a gate potential to the nano-network; (f) forming a top insulating layer on the electrode metal layer in order to prevent a current from leaking from the source electrode region and the drain electrode region through an electrolyte; (g) forming a fluid inlet by forming a fluid channel layer for transferring a fluid to the nano-network and the submerged gate electrode; and (h) fixing a detector material, which selectively reacts with a target material, to a surface of the nano-network.