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Two-step degradation of a-InGaZnO thin film transistors under DC bias stress.
- Source :
-
Solid-State Electronics . Feb2019, Vol. 152, p4-10. 7p. - Publication Year :
- 2019
-
Abstract
- Highlights • A unified explanation is proposed to consistently explain the two-step degradation of a-IGZO TFTs under DC PBTI stress without or with different stress V ds. • For PBTI stress without stress V ds , the initial negative V th shift is believed to be induced by donor-like defect states corresponding to H 2 O molecule and intrinsic defects. • For PBTI stress with stress V ds , the negative shift is believed to be induced by donor-like defect states corresponding to oxygen vacancies. The gate-bias-induced electron trapping mechanism is responsible for the positive V th shift. Abstract A unified explanation is proposed to consistently explain the two-step degradation of amorphous InGaZnO (a-IGZO) thin film transistors (TFTs) under DC positive bias temperature instability (PBTI) stress without or with different drain stress voltages (V ds). For PBTI stress without stress V ds , this initial negative V th shift is believed to be induced by donor-like defect states corresponding to H 2 O molecule and intrinsic defects, while for PBTI stress with stress V ds , the negative shift is believed to be induced by donor-like defect states corresponding to oxygen vacancies. The gate-bias-induced electron trapping mechanism is responsible for positive V th shift. These transitions from negative to positive V th shift are resulted from the competition between the donor-like states creation and electron trapping. [ABSTRACT FROM AUTHOR]
- Subjects :
- *THIN film transistors
*ELECTRON traps
Subjects
Details
- Language :
- English
- ISSN :
- 00381101
- Volume :
- 152
- Database :
- Academic Search Index
- Journal :
- Solid-State Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 133642851
- Full Text :
- https://doi.org/10.1016/j.sse.2018.11.005