Deuterium passivation of interface traps in MOS devices

Kangguo Cheng, Karl Hess, Joseph W. Lyding

Research output: Contribution to journalArticle

Abstract

The mechanism for deuterium passivation of interface traps in MOS devices is studied. Normal channel hot electron (CHE) stress was performed on hydrogen-passivated devices to locally desorb hydrogen from the interface at the drain region. The stressed devices were annealed in deuterium at 400°C, resulting in a full recovery of device characteristics. These devices were then subjected to CHE stress again in two modes. Some of them were stressed in the normal mode while others were stressed in the reverse mode in which the source and drain were interchanged. Compared with hydrogenated devices, these deuterated devices under the normal stress exhibit a significant reduction in interface trap generation and threshold voltage shift. In contrast, insignificant reliability improvement was observed for the reverse stress case. The asymmetric degradation behaviors on these deuterated devices suggest that the effectiveness of implementing deuterium to improve device reliability is limited by its replacement of pre-existing hydrogen at the oxide/silicon interface.

Original languageEnglish (US)
Pages (from-to)441-443
Number of pages3
JournalIEEE Electron Device Letters
Volume22
Issue number9
DOIs
StatePublished - Sep 1 2001

Keywords

  • Deuterium
  • Hot-carrier
  • Interface trap
  • MOS device
  • Oxide
  • Passivation
  • Reliability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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