EEE 417Presentation onJunctionless Nanowire Transistor Biosensor

Presented By:

Md. Mahmudul HassanID# 2009-1-80-012

Rafia ZihanID# 2012-3-80-009

Introduction to Junctionless Nanowire Transistor

Current flow is

controlled by a silicon

gate.The gate is separated

from the nanowire by a

thin insulating layer.The silicon nanowire is heavily n-doped while the

gate is p-doped or vice versa.It depletes electrons or holes in the region of the

nanowire under the gate.

How Does It Work

If a voltage is applied

along the nanowire,

current cannot flow. The depletion region

"squeezes" the

current in the nanowire. If a voltage is

applied to the gate, the

squeezing effect is reduced and current can flow.

As a BiosensorWhen positively charged

target molecules bind the

receptor modified on a p-type

NW, holes are depleted in the

NW, resulting in a decrease in

conductance.Negatively charged target

molecules captured by the

receptor would make an

accumulation of holes, causing

an increase in conductance.

As a Biosensor

Biosensor is biased at a particular point.

Amount of ∆Id shows amount of biomarker in a fixed volume of blood.

Comparison to competitor

Faster and use less power than any conventional transistor.

Overcomes difficulty to change doping concentration of a nanoscale material .

Simple to build. Reduced costs.Hardly suffers from current leakage.Has near-ideal electrical properties.