Electrical performances of low temperature annealed hafnium oxide deposited at room temperature
- Citation:
- Pereira, L., Barquinha Fortunato Martins P. E. R. "Electrical performances of low temperature annealed hafnium oxide deposited at room temperature." Materials Science Forum. 514-516 (2006): 58-62.
Abstract:
In this work, HfO2 was deposited by r.f. sputtering at room temperature and then annealed for different times at 200°C in a forming gas atmosphere. After annealing for 2 hours the HfO2 layers present a reduction on the flat band voltage of about 1 V, relatively to the as deposited film, decreasing from -2.23V down to -1.28 V. This means an improvement of the interface properties and a reduction on the oxide charge density from 1.33×1012 cm-2 to 7.62×1011 cm -2. The dielectric constant reaches a maximum of 18.3 after 5h annealing due to film's densification. When annealing for longer times such as 10h a small degradation of the electrical properties is observed. After 10h annealing the dielectric constant, flat band voltage and fixed charge density are respectively, 14.9, -2.96 V and 1.64×1012 cm-2 and the leakage current also increases due to film's crystallization.
Notes:
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