Method for making metal capacitors with low leakage currents for mixed-signal devices
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United States of America Patent
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May 25, 2004
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Nov 16, 2001
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Abstract
A method for making metal-insulator-metal (MIM) capacitors having insulators with high-dielectric-constant and sandwiched between wide-band-gap insulators resulting in low leakage currents and high capacitance per unit area is achieved. The high-k layer increases the capacitance per unit area for next generation mixed-signal devices while the wide-band-gap insulators reduce leakage currents. In a second embodiment, a multilayer of different high-k materials is formed between the wide-band-gap insulators to substantially increase the capacitance per unit area. The layer materials and thicknesses are optimized to reduce the nonlinear capacitance dependence on voltage.
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