First Demonstration of BEOL-Compatible Atomic-Layer-Deposited InGaZnO TFTs with 1.5 nm Channel Thickness and 60 nm Channel Length Achieving ON/OFF Ratio Exceeding 1011, SS of 68 mV/dec, Normal-off Operation and High Positive Gate Bias Stability
2023 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)(2023)
摘要
In this work, we report on the first demonstration of atomic-layerdeposited (ALD) InGaZnO (IGZO) thin film transistors (TFTs) with extreme scaled channel thickness $( \mathrm{T}_{ch})$ of 1.5 nm and channel length $( \mathrm{L}_{ch})$ of 60 nm. These ALD IGZO TFTs exhibit desirable electrical performance including a high on/off ratio exceeding $10 ^{11}$, a steep subthreshold swing (SS) of 68 mV/dec, a small DIBL of 30 mV/V and a normal-off operation. By optimizing the duration of O
2
annealing at $250 ^{\circ}\mathrm{C}$, the threshold voltage $( \mathrm{V}_{T})$ roll-off issue at scaled L
ch
is resolved together with a remarkably high degree of stability to the positive gate bias stress (PBS). A trap model with its possible microscopic origin is proposed, providing a new insight into the reliability of IGZO TFTs.
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