Methods for post etch cleans

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.