摘要:
A method of processing a semiconductor substrate, comprising the steps of: heating a substance within a first chamber, at a selected temperature which is above the minimum decomposition temperature of the substance, to cause decomposition of the substance into a predetermined gas; cooling the gas to below the minimum decomposition temperature of the substance; transporting the gas from the first chamber to a second chamber; and exposing a semiconductor substrate, located in the second chamber, to the cooled gas.
摘要:
An integrated circuit includes insulated gate field effect transistors (IGFETs), having gate dielectric layers wherein a nitrogen concentration in the gate dielectric varies between a first concentration at the gate electrode/gate dielectric interface and a second concentration at the gate dielectric/substrate interface. In one embodiment the gate dielectric is an oxynitride formed by an N2 plasma; and the oxynitride has top surface nitrogen concentration that is higher than a bottom surface nitrogen concentration. In a further aspect of the present invention, an integrated circuit includes a plurality of IGFETs, wherein various ones of the plurality of IGFETs have different gate dielectric thicknesses and compositions. A method of forming IGFETs with different gate dielectric thicknesses and compositions, on a single integrated circuit, includes forming a first oxynitride layer, forming a masking layer, removing a portion of the first oxynitride layer, forming an oxide layer where the oxynitride was removed, and forming a plurality of gate electrodes, a first portion of the gate electrodes overlying the first oxynitride layer.
摘要:
An oxidation process that produces multi-layer, yet very thin oxides of silicon, formed on silicon substrates, includes pushing wafers at a particular range of speeds, into a furnace at a particular range of temperatures, sequentially oxidizing the wafers in varying chemical ambients, and operating an external chlorine compound generator coupled to the furnace. Oxides formed in this manner have good uniformity and low interface state density and are suitable for forming FETs. In a particular embodiment, a first portion of an oxide stack is formed in an oxygen/nitrogen ambient, a second portion of an oxide stack is formed in a carbon dioxide/hydrogen chloride/oxygen ambient, and a third portion of an oxide stack is formed by a wet oxidation. The second portion of the oxide stack is formed when 1,2-dichloroethylene is treated with heat and oxygen to produce carbon dioxide and hydrogen chloride gas that is then introduced into the furnace.
摘要:
A method of forming an isolation structure in a semiconductor substrate is described. A trench is first etched into a semiconductor substrate. The trench is subjected to a nitrogen-oxide gas ambient and is annealed to form a silicon-oxynitride surface along the trench sidewalls. A first oxide layer is then formed within the trench. The first oxide layer is subjected to a nitridation step and is annealed to form an oxy-nitride surface on the first oxide layer and a silicon-oxynitride interface between the first oxide layer and the semiconductor substrate. A second oxide layer is then deposited over the oxy-nitride surface of the first oxide layer. The method and isolation structure of the present invention reduce dopant outdiffusion, reduce trench stresses, allow more uniform growth of thin gate oxides, and permit the use of thinner gate oxides.
摘要:
Transistors are formed on the substrate having two different thickness' of gate oxides. A silicon nitride mask is used to protect one of the gate oxides while the other is grown. A nitride mask is formed from a hydrogen balanced nitride layer formed using direct plasma deposited nitride with an ammonia and silane chemistry. In one embodiment the nitride mask remains in place in the completed transistor.
摘要:
A method of forming an isolation structure in a semiconductor substrate is described. A trench is first etched into a semiconductor substrate. A first oxide layer is then formed with the trench. The first oxide layer is subjected to a nitrogen-oxide gas ambient and is annealed to form an oxy-nitride surface on the first oxide layer and a silicon-oxynitride interface between the first oxide layer and the semiconductor substrate. A second oxide layer is then deposited over the oxy-nitride surface of the first oxide layer. The method and isolation structure of the present invention prevents dopant outdiffusion, reduces trench stresses, allows more uniform growth of thin gate oxides, and permits the use of thinner gate oxides.
摘要:
A method of forming an isolation structure in a semiconductor substrate is described. A trench is first etched into a semiconductor substrate. A first oxide layer is then formed with the trench. The first oxide layer is subjected to a nitrogen-oxide gas ambient and is annealed to form an oxy-nitride surface on the first oxide layer and a silicon-oxynitride interface between the first oxide layer and the semiconductor substrate. A second oxide layer is then deposited over the oxy-nitride surface of the first oxide layer. The method and isolation structure of the present invention prevents dopant outdiffusion, reduces trench stresses, allows more uniform growth of thin gate oxides, and permits the use of thinner gate oxides.
摘要:
A method for making a semiconductor device is described. That method comprises forming a high-k gate dielectric layer on a substrate. After forming a silicon nitride layer on the high-k gate dielectric layer, a gate electrode is formed on the silicon nitride layer.
摘要:
A method of forming a dielectric layer suitable for use as the gate dielectric layer in a MOSFET includes passivating the surface of a semiconductor substrate at a temperature less than approximately 80° C. and nitridizing the passivation layer. In particular embodiments, passivating a silicon wafer includes forming a hydroxy-silicate layer at approximately 24° C. In a further aspect of the present invention, an integrated circuit includes a plurality of insulated gate field effect transistors, wherein various ones of the plurality of transistors have gate dielectric layers of the nitridized passivation layer.
摘要:
A method of forming an isolation structure in a semiconductor substrate is described. A trench is first etched into a semiconductor substrate. A first oxide layer is then formed with the trench. The first oxide layer is subjected to a nitrogen-oxide gas ambient and is annealed to form an oxy-nitride surface on the first oxide layer and a silicon-oxynitride interface between the first oxide layer and the semiconductor substrate. A second oxide layer is then deposited over the oxy-nitride surface of the first oxide layer. The method and isolation structure of the present invention prevents dopant outdiffusion, reduces trench stresses, allows more uniform growth of thin gate oxides, and permits the use of thinner gate oxides.