摘要:
Methods of manufacturing a semiconductor device. One method includes the steps of: (1) providing a substrate over which is to be deposited a metal silicide layer having a stoichiometric ratio within a desired range, (2) providing a target composed of a metal silicide, the target subject to degradation by reason of use, (3) sputtering atoms from the target to form the metal silicide layer over the substrate, the stoichiometric ratio subject to being without the desired range by reason of the degradation of the target and (4) depositing a predetermined amount of silicon on the metal silicide layer to return the stoichiometric ratio to within the desired range, a useful life of the target thereby increased.
摘要:
In an integrated circuit, an opening (e.g., via or window) is filled with an Al-based plug which has essentially a orientation and comprises at most three grains. These characteristics are achieved by first depositing a texture control Ti layer having substantially a (002) basal plane orientation followed by at least three Al-based sublayers. The grain sizes and deposition conditions are controlled in such a way that during deposition of the third sublayer, the microstructure of the plug adjusts itself to produce a single grain (or at most three).
摘要:
Tungsten plugs are formed in a manner which avoids the formation of unwanted tungsten volcanoes by depositing at least three and preferably five to seven layers of tungsten within a contact hole to form a layered plug. In particularly useful embodiments, the layers are deposited at alternating fast and slow rates of deposition.
摘要:
Tungsten plugs are formed by passivating a substrate having a contact hole with SiH.sub.4, forming a nucleation layer on the passivated substrate by reducing WF.sub.6 with SiH.sub.4 at relatively low pressures and depositing tungsten to substantially fill the contact hole by reducing WF.sub.6 with H.sub.2 at relatively high pressures. Alternatively, rapid thermal annealing is used to cure pinhole defects in a titanium nitride layer on a substrate to avoid the formation of unwanted tungsten volcanoes.
摘要:
A Si IC includes an Al-based layer which is deposited as a composite of sublayers of different composition Al-based materials. In one embodiment a first sublayer comprises an Al-Si-based alloy disposed so as to prevent substantial Si migration into the first sublayer, and a second sublayer, above the first, comprises an Al-based alloy with substantially no Si to alleviate precipitation-induced problems. The selection of the thickness of the second sublayer to be a major portion and the inclusion of barrier layers are also described.
摘要:
The present invention provides a process for forming a sub-micron p-type metal oxide semiconductor (PMOS) structure on a semiconductor substrate. The process includes forming a gate oxide on the semiconductor substrate, forming a gate layer on the gate oxide by depositing a first gate layer on the gate oxide at a first deposition rate and depositing a second gate layer on the first layer at a second deposition rate to provide an improved stress accommodation within the gate structure. The process further includes forming a silicide dopant barrier on the gate. Due to the presence of the improved stress accommodation in the gate, the integrity of the silicide dopant barrier is substantially enhanced. This increased silicide integrity prevents significant damage to the silicide dopant barrier layer during subsequent fabrication processes. As such, the dopant barrier is able to provide the intended degree of resistance to dopant penetration, for example boron, during the formation of source and drain regions adjacent the gate structure.
摘要:
The present invention provides a method of forming a metal oxide metal (MOM) capacitor on a substrate, such as a silicon substrate, of a semiconductor wafer in a rapid thermal process (RTP) machine. The MOM capacitor is fabricated by forming a metal layer on the semiconductor substrate. The metal layer is then subjected to a first rapid thermal process in a substantially inert but nitrogen-free atmosphere that consumes a portion of the metal layer to form a first metal electrode layer and a silicide layer between the first metal electrode and the semiconductor substrate. The semiconductor wafer is then subjected to a second rapid thermal process. During this process, the remaining portion of the metal layer is oxidized to form a metal oxide on the first metal electrode, which serves as the dielectric layer of the MOM capacitor. Following the formation of the dielectric layer, a second metal electrode layer is then conventionally formed on the metal oxide, which completes the formation of the MOM capacitor. Preferably, the first electrode layer and the metal oxide layer are formed in a single RTP machine.
摘要:
A method of passivating copper interconnects is disclosed. A freshly electrodeposited copper interconnect such as formed as via/trench structures in semiconductor manufacturing is chemically converted to passivating surface of copper tungstate or copper chromate either through MOCVD reaction with vapors of tungsten or chromium alkoxides, or by pyrolytic reaction with tungsten or chromium carbonyl in the presence of O.sub.2. The copper interconnect having the formed passivation service is then chemically mechanically polished. The process can be used with various manufacturing processes, including single and dual damascene processes.
摘要:
The present invention provides a semiconductor device that has a metal barrier layer for a dielectric material, which can be used in an integrated circuit, if so desired. The semiconductor device provides a capacitance to the integrated circuit and in a preferred embodiment comprises a first layer located on a surface of the integrated circuit. A metal barrier layer is located on the first layer and is susceptible to oxidation by oxygen. A high K capacitor dielectric layer (i.e., a higher K than silicon dioxide) that contains oxygen, such as tantalum pentoxide, is located over the metal barrier layer. The semiconductor device further includes a first layer located over the high K capacitor dielectric layer.
摘要:
The present invention provides a unique a resistor formed on a semiconductor substrate. The resistor preferably comprises a first resistor layer that includes a first metal silicide, such as tungsten silicide, and nitrogen and that is formed on the substrate. The first layer has a first thickness and a concentration of nitrogen incorporated therein. The nitrogen concentration may be varied to obtain a desired resistive value of the resistor. Thus, depending on the concentration of nitrogen, a wide range of resistive values may be achieved. The resistor further comprises a second resistor layer with a second thickness that includes a second metal silicide and that is formed on the first resistor layer. Thus, the present invention provides a metal silicide-based resistor having nitrogen incorporated therein which allows the resistance of the resistor to be tailored to specific electrical applications. Yet at the same time, the resistor is far less susceptible to temperature and voltage variation than conventional diffused resistors and, thereby, provides a more precise resistor.