Semiconductor device manufacturing: process – Chemical etching – Liquid phase etching
Reexamination Certificate
2008-04-28
2009-08-04
Le, Dung A. (Department: 2818)
Semiconductor device manufacturing: process
Chemical etching
Liquid phase etching
C438S690000, C438S711000, C438S713000, C438S714000
Reexamination Certificate
active
07569492
ABSTRACT:
The current invention provides methods for performing a cleaning process that provides greater cleaning efficiency with less damage to device structures. After etching and photoresist stripping, a first plasma clean is performed. The first plasma clean may comprise one or more steps. Following the first plasma clean, a first HO based clean is performed. The first HO based clean may be a de-ionized water rinse, a water vapor clean, or a plasma clean, where the plasma includes hydrogen and oxygen. Following the first HO based clean, a second plasma clean is performed, which may comprise one or more steps. A second HO based clean follows the second plasma clean, and may be a de-ionized water rinse, a water vapor clean, or a plasma clean, where the plasma includes hydrogen and oxygen. For plasma processes, an RF generated plasma, a microwave generated plasma, an inductively coupled plasma, or combination may be used. Embodiments of the invention are performed after an etch, such as a metal etch, via etch, contact etch, polysilicon etch, nitride etch or shallow trench isolation etch has been performed. Photoresist may be removed either prior to, during, or after cleaning processes according to embodiments of the invention, using an oxygen-containing plasma. Photoresist removal may be performed at low temperatures.
REFERENCES:
patent: 5811358 (1998-09-01), Tseng et al.
patent: 2002/0090827 (2002-07-01), Yokoshima
Alba Simone
Chen David L.
Chiu Eddie Ka Ho
Colangelo Giuseppe
Li Senzi
Le Dung A.
Novellus Systems Inc.
STMicroelectonics S.R.L.
Weaver Austin Villeneuve & Sampson LLP
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