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Interface Evolution of TiN/Poly Si as Gate Material on Si/HfO2 Stack |
JIANG Ran;YAO Li-Ting |
School of Physics and Microelectronics, Shandong University, Jinan 250100 |
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Cite this article: |
JIANG Ran, YAO Li-Ting 2008 Chin. Phys. Lett. 25 2190-2193 |
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Abstract TiN as gate electrode in Si/HfO2/TiN/poly-Si stack is evaluated after the postmetal annealing treatments. Interface reactions are investigated using electron-energy-loss spectroscopy and x-ray photoelectron spectroscopy. The work function of the TiN/poly-Si stack shows strong dependence on the postmetal deposition annealing conditions. The interfacial product in TiN/poly-Si interface is inferred as TiSiN, which is beneficial for the whole high-k stack since TiSiN possesses higher work function compared to TiN and poly-Si.
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Keywords:
71.55.Ak
71.70.Gm
77.55.+f
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Received: 20 November 2007
Published: 31 May 2008
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