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Impact of Lanthanum on positive-bias temperature instability - insight from first-principles simulation

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Impact of Lanthanum on positive-bias temperature instability - insight from first-principles simulation
นักวิจัย : Gu, Chen Jie , Ang, Diing Shenp
คำค้น : DRNTU::Science::Chemistry::Physical chemistry::Electrochemistry
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2556
อ้างอิง : Gu, C. J., & Ang, D. S. (2013). Impact of Lanthanum on positive-bias temperature instability - insight from first-principles simulation. ECS transactions, 53(3), 193-204. , http://hdl.handle.net/10220/18410 , http://dx.doi.org/10.1149/05303.0193ecst
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : ECS transactions
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The impact of lanthanum (La) on positive-bias temperature instability (PBTI) is examined via first-principles simulation of the electronic properties of the oxygen vacancy (VO) and vacancy-interstitial (VO-Oi) paired defects in the hafnium dioxide (HfO2) gate dielectric. The purpose is to understand the recently reported retardation of PBTI recovery in La-doped HfO2 gate n-MOSFETs, indicating that La doping has made part of the stress induced electron trapping become more permanent. Simulation results show that the formation energy of both defects are significantly decreased by La doping, implying that these defects are more readily formed in the La-doped HfO2 as compared to the undoped counterpart. The higher density of VO’s should increase PBTI effect, contrary to the experimental observation of a reduced PBTI effect. The discrepancy may be reconciled by the smaller gate current in the La-doped n-MOSFET, believed to be due to the larger tunneling barrier that results from La dipoles at the HfO2/SiOx interface. With a smaller gate current, electron trapping – the main mechanism of PBTI – is correspondingly reduced. But the trap state of VO in the La-doped HfO2 remains as shallow as that in the undoped counterpart and could not account for the reduction in the PBTI recovery observed experimentally. On the other hand, the trap state of the VO-Oi defect is found to be much deeper, and the greater ease of its formation in the La-doped HfO2 could explain the reduced PBTI recovery observed experimentally.

บรรณานุกรม :
Gu, Chen Jie , Ang, Diing Shenp . (2556). Impact of Lanthanum on positive-bias temperature instability - insight from first-principles simulation.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Gu, Chen Jie , Ang, Diing Shenp . 2556. "Impact of Lanthanum on positive-bias temperature instability - insight from first-principles simulation".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Gu, Chen Jie , Ang, Diing Shenp . "Impact of Lanthanum on positive-bias temperature instability - insight from first-principles simulation."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2556. Print.
Gu, Chen Jie , Ang, Diing Shenp . Impact of Lanthanum on positive-bias temperature instability - insight from first-principles simulation. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2556.