中国物理B ›› 2015, Vol. 24 ›› Issue (10): 106601-106601.doi: 10.1088/1674-1056/24/10/106601

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Analysis of recoverable and permanent components of threshold voltage shift in NBT stressed p-channel power VDMOSFET

Danijel Dankovića, Ninoslav Stojadinovića, Zoran Prijića, Ivica Manića, Vojkan Davidovića, Aneta Prijića, Snežana Djorić-Veljkovićb, Snežana Golubovića   

  1. a Department of Microelectronics, Faculty of Electronic Engineering, University of Nis, Serbia;
    b Department of Mathematics, Physics and Informatics, Faculty of Civil Engineering and Architecture, University of Nis, Serbia
  • 收稿日期:2015-03-01 修回日期:2015-04-28 出版日期:2015-10-05 发布日期:2015-10-05
  • 基金资助:
    Project supported by the Fund from the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant Nos. OI-171026 and TR-32026) and the Ei PCB Factory, Niš.

Analysis of recoverable and permanent components of threshold voltage shift in NBT stressed p-channel power VDMOSFET

Danijel Dankovića, Ninoslav Stojadinovića, Zoran Prijića, Ivica Manića, Vojkan Davidovića, Aneta Prijića, Snežana Djorić-Veljkovićb, Snežana Golubovića   

  1. a Department of Microelectronics, Faculty of Electronic Engineering, University of Nis, Serbia;
    b Department of Mathematics, Physics and Informatics, Faculty of Civil Engineering and Architecture, University of Nis, Serbia
  • Received:2015-03-01 Revised:2015-04-28 Online:2015-10-05 Published:2015-10-05
  • Contact: Danijel Danković E-mail:danijel.dankovic@elfak.ni.ac.rs
  • Supported by:
    Project supported by the Fund from the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant Nos. OI-171026 and TR-32026) and the Ei PCB Factory, Niš.

摘要: In this study we investigate the dynamic recovery effects in IRF9520 commercial p-channel power vertical double diffused metal-oxide semiconductor field-effect transistors (VDMOSFETs) subjected to negative bias temperature (NBT) stressing under the particular pulsed bias. Particular values of the pulsed stress voltage frequency and duty cycle are chosen in order to analyze the recoverable and permanent components of stress-induced threshold voltage shift in detail. The results are discussed in terms of the mechanisms responsible for buildup of oxide charge and interface traps. The partial recovery during the low level of pulsed gate voltage is ascribed to the removal of recoverable component of degradation, i.e., to passivation/neutralization of shallow oxide traps that are not transformed into the deeper traps (permanent component). Considering the value of characteristic time constant associated with complete removal of the recoverable component of degradation, it is shown that by selecting an appropriate combination of the frequency and duty cycle, the threshold voltage shifts induced under the pulsed negative bias temperature stress conditions can be significantly reduced, which may be utilized for improving the device lifetime in real application circuits.

关键词: negative bias temperature instability, vertical double-diffused metal-oxide semiconductor, recoverable, permanent, degradation

Abstract: In this study we investigate the dynamic recovery effects in IRF9520 commercial p-channel power vertical double diffused metal-oxide semiconductor field-effect transistors (VDMOSFETs) subjected to negative bias temperature (NBT) stressing under the particular pulsed bias. Particular values of the pulsed stress voltage frequency and duty cycle are chosen in order to analyze the recoverable and permanent components of stress-induced threshold voltage shift in detail. The results are discussed in terms of the mechanisms responsible for buildup of oxide charge and interface traps. The partial recovery during the low level of pulsed gate voltage is ascribed to the removal of recoverable component of degradation, i.e., to passivation/neutralization of shallow oxide traps that are not transformed into the deeper traps (permanent component). Considering the value of characteristic time constant associated with complete removal of the recoverable component of degradation, it is shown that by selecting an appropriate combination of the frequency and duty cycle, the threshold voltage shifts induced under the pulsed negative bias temperature stress conditions can be significantly reduced, which may be utilized for improving the device lifetime in real application circuits.

Key words: negative bias temperature instability, vertical double-diffused metal-oxide semiconductor, recoverable, permanent, degradation

中图分类号:  (Theory of diffusion and ionic conduction in solids)

  • 66.30.Dn
68.35.bg (Semiconductors) 73.40.Qv (Metal-insulator-semiconductor structures (including semiconductor-to-insulator)) 82.33.Pt (Solid state chemistry)