Processes to form a metallic film stack

Details Processes to form a metallic film stack Processes to form a metallic film stack

2005-02-22

2005-02-22

Tsai, H. Jey (Department: 2812)

Semiconductor device manufacturing: process

Coating with electrically or thermally conductive material

To form ohmic contact to semiconductive material

C438S686000

Reexamination Certificate

active

06858536

ABSTRACT:
The present invention relates to an electrically conductive film stack for semiconductors and methods and apparatus for providing same. A film stack comprising a first layer of a platinum-rhodium alloy deposited by metal organic chemical vapor deposition (MOCVD) in the presence of a reducer, such as hydrogen (H2) gas, and a second layer of the platinum-rhodium alloy deposited in the presence of an oxidizing gas, such as ozone (O3), provides an electrical conductor that is also a relatively good barrier to oxygen. The platinum-rhodium film stack can be used as an electrode or capacitor plate for a capacitor with a high-k dielectric material. The electrode formed with alternating reducing and oxidizing agents produces a rough surface texture, which enhances the memory cell capacitance.

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