Patent ID: 9564200
Date: 2017-02-07
CPC Classifications: G11C,H01L

Claim:
1. A pillar-type field effect transistor having low leakage current, comprising: a substrate; a semiconductor pillar formed substantially perpendicular to the substrate, the semiconductor pillar being elongated in a direction substantially perpendicular to the substrate and having a length substantially perpendicular to the substrate, the semiconductor pillar forming along the length of the semiconductor pillar a source region at one end thereof, a drain region at the other end thereof, and a semiconductor body between the source region and the drain region; a gate insulating layer formed around the semiconductor pillar along the length thereof; a gate electrode formed around the gate insulating layer, the gate electrode being divided into a first gate electrode and a second gate electrode along the length of the semiconductor pillar, wherein one of the first gate electrode and the second gate electrode is a source-side gate electrode, the other one thereof is a drain-side gate electrode electrically connected to the source-side gate electrode, and the drain-side gate electrode has a work function smaller than that of the source-side gate electrode to thereby reduce a gate-induced-drain leakage.