摘要:
A method of plasma etching a metal layer (e.g., titanium (Ti), tantalum (Ta), tungsten (W), and the like) or a metal-containing layer (e.g., tantalum silicon nitride (TaSiN), titanium nitride (TiN), tungsten nitride (WN), and the like) formed on a hafnium-based dielectric material is disclosed. The metal/metal-containing layer is etched using a gas mixture comprising a halogen-containing gas and a fluorine-containing gas. The fluorine within the gas mixture provides a high etch selectivity for the hafnium-based dielectric material.
摘要:
The present invention is a method for hydrogen-free plasma etching of indium tin oxide using a plasma generated from an etchant gas containing chlorine as a major constituent (i.e., chlorine comprises at least 20 atomic %, preferably at least 50 atomic %, of the etchant gas). Etching is performed at a substrate temperature of 100° C. or lower. The chlorine-comprising gas is preferably Cl2. The etchant gas may further comprise a non-reactive gas, which is used to provide ion bombardment of the surface being etched, and which is preferably argon. The present invention provides a clean, fast method for plasma etching indium tin oxide. The method of the invention is particularly useful for etching a semiconductor device film stack which includes at least one layer of a material that would be adversely affected by exposure to hydrogen, such as N- or P-doped silicon.
摘要:
A method of fabricating a gate structure of a field effect transistor comprising a gate dielectric that is notched beneath a gate electrode using an isotropic plasma etch process. In one embodiment, the etch process uses a gas comprising a halogen gas (e.g., chlorine (Cl2)), a hydrocarbon gas (e.g., methane (CH4)), and an optional reducing gas (e.g., carbon monoxide (CO)), applies a substrate bias of not greater than 20 W, and maintains the substrate temperature of not less than 200 degrees Celsius.
摘要翻译:一种制造场效应晶体管的栅极结构的方法,该场效应晶体管包括使用各向同性等离子体蚀刻工艺在栅电极下方切口的栅极电介质。 在一个实施例中,蚀刻工艺使用包含卤素气体(例如氯(Cl 2 O 2)),烃气体(例如甲烷(CH 3 SO 3))的气体, 和可选择的还原气体(例如一氧化碳(CO)),施加不大于20W的衬底偏压,并将衬底温度保持在不低于200摄氏度。
摘要:
The present invention provides novel etching techniques for etching Si—Ge, employing SF6/fluorocarbon etch chemistries at a low bias power. These plasma conditions are highly selective to organic photoresist. The techniques of the present invention are suitable for fabricating optically smooth Si—Ge surfaces. A cavity was etched in a layer of a first Si—Ge composition using SF6/C4F8 etch chemistry at low bias power. The cavity was then filled with a second Si—Ge composition having a higher refractive index than the first Si—Ge composition. A waveguide was subsequently fabricated by depositing a cladding layer on the second Si—Ge composition that was formed in the cavity. In a further embodiment a cluster tool is employed for executing processing steps of the present invention inside the vacuum environment of the cluster tool. In an additional embodiment a manufacturing system is provided for fabricating waveguides of the present invention. The manufacturing system includes a controller that is adapted for interacting with a plurality of fabricating stations.
摘要:
An etchant mixture of carbon tetrafluoride and argon in a plasma etch chamber produces straight walled isolation trenches in a silicon nitride layer, the trenches having rounded bottoms and no microtrenching.
摘要:
A method for preventing electrical short circuits in a multi-layer magnetic film stack comprises providing a film stack that includes a layer of magnetic material having an exposed surface. A protective layer is deposited on the exposed surface of the magnetic layer. The protective layer may comprise, for example, a fluorocarbon or a hydrofluorocarbon. The film stack is etched and the protective layer protects the exposed surface from a conductive residue produced while etching the film stack. The method may be used in film stacks to form a magneto-resistive random access memory (MRAM) device.
摘要:
A method of etching high dielectric constant materials using halogen gas and reducing gas chemistry. An embodiment of the method is accomplished using a 20 to 300 sccm of chlorine and 2 to 200 sccm of carbon monoxide, regulated to a total chamber pressure of 2-100 mTorr to etch a hafnium oxide layer.