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.