Low-frequency noise in n-channel metal-oxide-semiconductor field-effect transistors undergoing soft breakdown

Ming Jer Chen*, Ting Kuo Kang, Yuan Hwa Lee, Chuan Hsi Liu, Yih J. Chang, Kuan Yu Fu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


For 3.3-nm thick gate oxide n-channel metal-oxide-semiconductor field-effect transistors subject to a stress gate voltage of 5.5 V, three distinct events are encountered in the time evolution of the gate current: stress-induced leakage current (SILC), soft breakdown (SBD), and hard breakdown (HBD). The localization of SBD and HBD paths, as well as their developments with the time, is determined electrically, showing random distribution in nature. At several stress times, we interrupt the stressing to measure the drain current low-frequency noise power Sid. As expected, Sid follows up the spontaneous changes at the onset of SBD and HBD. The Sid spectra measured in fresh and SILC mode are reproduced by a literature model accounting for the carrier number and surface mobility fluctuations in the channel, and, as a result, both preexisting and newly generated trap densities are assessed. The post-SBD Sid does originate from current fluctuations in the SBD percolation paths, which can couple indirectly to drain via underlying channel in series, or directly to drain if the SBD path is formed close to drain extension. In particular, a fluctuation in Sid itself in the whole SBD duration is observed. This phenomenon is very striking since it indeed evidences the dynamic percolation origin concerning the trapping-detrapping processes in and around the SBD paths. The subsequent HBD duration remarkably features a flat Sid, indicating the set-up of a complete conductive path prevailing over the trapping-detrapping processes.

Original languageEnglish
Pages (from-to)648-653
Number of pages6
JournalJournal of Applied Physics
Issue number1
Publication statusPublished - 2001 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


Dive into the research topics of 'Low-frequency noise in n-channel metal-oxide-semiconductor field-effect transistors undergoing soft breakdown'. Together they form a unique fingerprint.

Cite this