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Positive Bias Temperature Instability (PBTI) Characteristics of Contact-Etch-Stop-Layer-Induced Local-Tensile-Strained \hbox {HfO}_{2} nMOSFET

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7 Author(s)
Woei-Cherng Wu ; Dept. of Electrophys., Nat. Chiao Tung Univ., Hsinchu ; Tien-Sheng Chao ; Te-Hsin Chiu ; Jer-Chyi Wang
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The positive bias temperature instability (PBTI) characteristics of contact-etch-stop-layer (CESL)-strained HfO2 nMOSFET are thoroughly investigated. For the first time, the effects of CESL on an HfO2 dielectric are investigated for PBTI characteristics. A roughly 50% reduction of VTH shift can be achieved for the 300-nm CESL HfO2 nMOSFET after 1000-s PBTI stressing without obvious HfO2/Si interface degradation, as demonstrated by the negligible charge pumping current increase (< 4%). In addition, the HfO2 film of CESL devices has a deeper trapping level (0.83 eV), indicating that most of the shallow traps (0.75 eV) in as-deposited HfO2 film can be eliminated for CESL devices.

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Electron Device Letters, IEEE  (Volume:29 ,  Issue: 12 )