Method to control the interfacial layer for deposition of...

Semiconductor device manufacturing: process – Coating with electrically or thermally conductive material – Insulated gate formation

Reexamination Certificate

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C435S287300, C435S197000

Reexamination Certificate

active

06875677

ABSTRACT:
Methods of forming an interfacial layer on a hydrogen-passivated substrate are provided. These methods utilize atomic layer deposition techniques incorporating metal nitrate-based precursors, such as hafnium nitrate or zirconium nitrate, without introducing a hydrating agent, or oxidizing agent, such as water, during the formation of the interfacial layer. Also provided are methods of forming high-k films, by first forming an interfacial layer on the surface of a hydrogen-passivated substrate, and then depositing one, or more, high-k dielectric films.

REFERENCES:
patent: 6013553 (2000-01-01), Wallace et al.
patent: 6620713 (2003-09-01), Arghavani et al.
patent: 6750066 (2004-06-01), Cheung et al.
Article entitled: Nucleation and interface formation mecahanisms in atomic layer deposition of gate oxides; by Frank and Chabal, published in Applied Physics Letters, vol. 82, No. 26, Jun. 30, 2003.
Article entitled: Enhanced initial growth of atomic-layer-deposited metal oxided on hydrogen-terminated silicon; by Frank and Chabal, published in Applied Physics Letters, vol. 83, No. 4, Jul. 28, 2003.
Article entitled: Nucleation and growth of atomic layer deposited HfO2gate dielectric layers on chemical oxide (Si-O-H) and thermal oxide (SiO2or Si-O-N) underlayers; by Green et al., published in Journal of Applied Physics, vol. 92, No. 12, Dec. 15, 2002.
Article entitled: Atomic Layer Deposition of Hafnium Oxide Using Anhydrous Hafnium Nitrate; by Conley et al., published in Electrochemical and Solid-State Letters, available electronically Feb. 26,2002.
Article entitled: Atomic layer deposition of thin hafnium oxide films using a carbon free predursor; by Conley and Solanki, published in Journal of Applied Physics, vol. 93, No. 1, Jan. 1, 2003.

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