Hf-Based High-k Dielectrics: Process Development, Performance Characterization, and Reliability - Jack C. Lee,Young-Hee Kim
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In this work, the reliability of HfO2 (hafnium oxide) with poly gate and dual metal gate electrode (RüTa alloy, Ru) was investigated. Hard breakdown and soft breakdown, particularly the Weibull slopes, were studied under constant voltage stress. Dynamic stressing has also been used. It was found that the combination of trapping and detrapping contributed to the enhancement of the projected lifetime. The res ... Full description
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Description
In this work, the reliability of HfO2 (hafnium oxide) with poly gate and dual metal gate electrode (RüTa alloy, Ru) was investigated. Hard breakdown and soft breakdown, particularly the Weibull slopes, were studied under constant voltage stress. Dynamic stressing has also been used. It was found that the combination of trapping and detrapping contributed to the enhancement of the projected lifetime. The results from the polarity dependence studies showed that the substrate injection exhibited a shorter projected lifetime and worse soft breakdown behavior, compared to the gate injection. The origin of soft breakdown (first breakdown) was studied and the results suggested that the soft breakdown may be due to one layer breakdown in the bilayer structure (HfO2/SiO2: 4 nm/4 nm). Low Weibull slope was in part attributed to the lower barrier height of HfO2 at the interface layer. Interface layer optimization was conducted in terms of mobility, swing, and short channel effect using deep submicron MOSFET devices.
More Information
| Author | Jack C. Lee, Young-Hee Kim |
|---|---|
| Publisher | Springer International Publishing |
| Series | Synthesis Lectures on Solid State Materials and Devices |
| Release year | 2007 |
| Cover type | Softcover |
| EAN | 9783031014246 |