Tokyo Electron Limited

Kazuhito Tohnoe

Yusuke Hirayama

Frank M Cerio, Jr

Yasuyoshi Ishiyama

Wataru Hashizume

A plasma etching method is provided for forming a hole using a first processing gas to etch a silicon layer of a substrate to be processed including a silicon oxide film that is formed into a predetermined pattern. The method includes a first depositing step (S) of depositing a protective film on a surface of the silicon oxide film using a second processing gas containing carbon monoxide gas, a first etching step (S) of etching the silicon layer using the first processing gas, a second depositing step (S) of depositing the protective film on a side wall of a hole etched by the first etching step using the second processing gas, and a second etching step (S) of further etching the silicon layer using the first processing gas. The second depositing step (S) and the second etching step (S) are alternately repeated at least two times each.

Plasma etching method

There is provided a plasma etching method including a first process of etching an intermediate layer, which contains silicon and nitrogen and is positioned below a resist mask formed on a surface of a substrate, to cause a silicon layer positioned below the intermediate layer to be exposed through the resist mask and the intermediate layer, a second process of subsequently supplying a chlorine gas to the substrate to cause a reaction product to attach onto sidewalls of opening portions of the resist mask and the intermediate layer, and a third process of etching a portion of the silicon layer corresponding to the opening portion of the intermediate layer using a process gas containing sulfur and fluorine to form a recess in the silicon layer.

A method is provided for integrating metal-containing cap layers into copper (Cu) metallization of semiconductor devices. In one embodiment, the method includes providing a planarized patterned substrate containing metal surfaces and dielectric layer surfaces with a residue formed thereon, removing the residue from the planarized patterned substrate, and depositing metal-containing cap layers selectively on the metal surfaces by exposing the dielectric layer surfaces and the metal surfaces to a deposition gas containing metal-containing precursor vapor. The removing includes treating the planarized patterned substrate containing the residue with a reactant gas containing a hydrophobic functional group, and exposing the treated planarized patterned substrate to a reducing gas.

Growing community of inventors

Miyagi, Japan

Kazuhito Tohnoe