Unveiling the Influence of Channel Thickness on PBTI and LFN in Sub-10 nm-thick IGZO FETs: A Holistic Perspective for Advancing Oxide Semiconductor Devices
2023 International Electron Devices Meeting (IEDM)(2023)
摘要
In this work, we present the first systematic and comprehensive investigation into the impact of channel thickness (t
CH
) on the positive bias temperature instability (PBTI) and low frequency noise (LFN) of Indium-Gallium-Zinc-oxide (IGZO) FETs with sub-10 nm t
CH
. A novel Noise-PBTI-Noise (NPN) measuring scheme was proposed that combines LFN and PBTI measurements at different temperatures (T). Our study yields several key findings of significance: (1) FETs with a thinner t
CH
exhibit a higher susceptibility to electron trapping effects while demonstrating greater resilience to the hydrogen (H) effect. (2) Smaller t
CH
values are associated with higher levels of LFN. (3) The mobility fluctuation model (Δµ) effectively describes the LFN characteristics of the FETs, regardless of t
CH
values. Notably, we achieved the record low Hooge's parameter (α
H
) of 2.46×10
-4
among all amorphous oxide channel transistors. (4) The passivation effect of the H component formed during PBTI on existing traps was identified for the first time. This work highlights the significance of adopting a holistic approach to understanding and optimizing device performance in advancing oxide semiconductor device technology.
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关键词
Positive Bias Temperature Instability,Measurement Scheme,Low-frequency Noise,Electron Trapping,Transistor Channel,Band Gap,Conduction Band,Quantum Confinement,Channel Layer,Quantum Confinement Effect,Trap Density,Noise Level Increases,Favorable Stability
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