Patent ID: 8172948

Claim:
An apparatus for forming a feature in a layer, wherein the layer is supported by a substrate and wherein the layer is covered by a photoresist mask with photoresist features with a first CD, comprising: a plasma processing chamber, comprising: a chamber wall forming a plasma processing chamber enclosure; a substrate support for supporting a substrate within the plasma processing chamber enclosure; a pressure regulator for regulating the pressure in the plasma processing chamber enclosure; at least one electrode for providing power to the plasma processing chamber enclosure for sustaining a plasma; a gas inlet for providing gas into the plasma processing chamber enclosure; and a gas outlet for exhausting gas from the plasma processing chamber enclosure; a gas source in fluid connection with the gas inlet, comprising a first deposition gas source; a second deposition gas source; a de-fluoridation gas source; and an etchant gas source; a controller controllably connected to the gas source and the at least one electrode, comprising: at least one processor programmed to execute code residing on a computer readable media, comprising: computer readable code to provide at least three deposition cycles to form a sidewall deposition on a photoresist mask to form features with a second CD, within the photoresist features, comprising: computer readable code to provide a flow of a first deposition gas from the first deposition gas source to the plasma processing chamber enclosure; computer readable code to stop the flow of the first deposition gas from the first deposition gas source to the plasma processing chamber enclosure; computer readable code to provide a flow of a second deposition gas from the second deposition gas source to the plasma processing chamber enclosure after the flow of the first deposition gas is stopped; computer readable code to stop the flow of the second deposition gas from the second deposition gas source to the plasma processing chamber enclosure; computer readable code to provide a flow of a de-fluoridation gas from the de-fluoridation gas source to the plasma processing chamber enclosure after the flow of the second deposition gas is stopped; computer readable code to stop the flow of the de-fluoridation gas from the de-fluoridation gas source to the plasma processing chamber enclosure; computer readable code to provide a flow of an etchant gas from the etchant gas source to the plasma processing chamber after completion of the at least three deposition cycles and after the flow of the de-fluoridation gas is stopped; and computer readable code to etch features in the layer, using the etchant gas wherein the features in the layer have a third CD.