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Negative Bias Temperature Instability of Deep Sub-Micron p-MOSFETs Under Pulsed Bias Stress



Baozhong Zhu, John S. Suehle, Y Chen, J B. Bernstein


Negative bias temperature instability (NBTI) and Positive bias temperature instability (PBTI) of p-MOSFETs with 2.4 nm thick oxide films were studied. The Δ}Vth interface trap generation of p-MOSFET at DC and AC bias stresses with frequency up to 500 KHz were measured. Additional tests were also conducted under unipolar and bipolar bias stresses with varied stress on and off times. The Δ}Vth and interface trap generation of p-MOSFET were observed to be significantly reduced for pulsed bias repetition frequencies greater than 10 KHz. however, Δ}Vth of PBTI was almost independent of the bias stress frequency. These results suggested that there are different mechanisms for NBTI and PBTI phenomena, and the reliability specifications of NBTI could possibly be relaxed under certain pulsed operation conditions.
Proceedings Title
Proc., Integrated Reliability Workshop
Conference Dates
October 21-24, 2002
Conference Location
Lake Tahoe, CA, USA
Conference Title
2002 Integrated Reliability Workshop


frequency dependence, p-MOSFET, Negative bias temperature instability


Zhu, B. , Suehle, J. , Chen, Y. and Bernstein, J. (2002), Negative Bias Temperature Instability of Deep Sub-Micron p-MOSFETs Under Pulsed Bias Stress, Proc., Integrated Reliability Workshop, Lake Tahoe, CA, USA, [online], (Accessed April 13, 2024)
Created October 20, 2002, Updated October 12, 2021