摘要:
A method for forming a ultra-shallow junction region (104). A silicon film (single crystalline, polycrystalline or amorphous) is deposited on the substrate (100) to form an elevated S/D (106). A metal film is deposited over the silicon film and reacted with the silicon film to form a silicide film (108). The silicon film is preferably completely consumed by the silicide film formation. An implant is performed to implant the desired dopant either into the metal film prior to silicide formation or into the silicide film after silicide formation. A high temperature anneal is used to drive the dopant out of the silicide film to form the junction regions (104) having a depth in the substrate (100) less than 200A. This high temperature anneal may be one of the anneals that are part of the silicide process or it may be an additional process step.
摘要:
A trench isolation structure including high density plasma enhanced silicon dioxide trench filling (122) with chemical mechanical polishing removal of non-trench oxide.
摘要:
A method of making a semiconductor device or integrated circuit produces trench isolation structures having rounded corners in order to reduce gate oxide weakness and to avoid the so-called "double hump" curve produced by the corner effect. A LOCOS oxide is removed from the surface of a silicon substrate to produce a depression in the surface. A silicon dioxide or silicon nitride layer is deposited over the surface including the silicon nitride used in the LOCOS process. The surface in anisotropically etched to form sidewall spacers either side of the area where the trench is to be formed. The substrate is then etched to form a trench. In an alternative method, nitride sidewalls are formed prior to removing the LOCOS oxide. The resulting structure is anisotropically etched to leave sidewalls on either side of the trench location, the sidewalls being made of the silicon nitride sidewall and the remainder of the LOCOS oxide. The substrate would then be etched to form the trench.
摘要:
A technique of producing a semiconductor device or integrated circuit produces a planarized refill layer which has a more uniform thickness after polishing, such as by chemical-mechanical polishing (CMP). Dummy active areas are inserted between active areas in that portion of the substrate which would normally be occupied by a field oxide in order to reduce to "dishing" that occurs during CMP in these areas. The dummy active areas can take the shape of a large block, a partially or completely formed ring structure or a plurality of pillars the area density of which can be adjusted to match the area density of the active areas in that region of the substrate. The design rule for the pillars can be such that no pillars are placed where polycrystalline silicon lines or first level metallization lines are to be placed in order to avoid parasitic capacitances.
摘要:
A method of making a semiconductor device or integrated circuit produces trench isolation structures having rounded corners in order to reduce gate oxide weakness and to avoid the so-called "double hump" curve produced by the corner effect. A LOCOS oxide is removed from the surface of a silicon substrate to produce a depression in the surface. A silicon dioxide or silicon nitride layer is deposited over the surface including the silicon nitride used in the LOCOS process. The surface in anisotropically etched to form sidewall spacers either side of the area where the trench is to be formed. The substrate is then etched to form a trench. In an alternative method, nitride sidewalls are formed prior to removing the LOCOS oxide. The resulting structure is anisotropically etched to leave sidewalls on either side of the trench location, the sidewalls being made of the silicon nitride sidewall and the remainder of the LOCOS oxide. The substrate would then be etched to form the trench.
摘要:
A dynamic random access memory device (10) includes three separate sections - an input/output section (12), a peripheral transistor section (14), and a memory array section (16), all formed on a p- type substrate layer (18). The dynamic random access memory device (10) can employ separate substrate bias voltages for each section. The input/output section (12) has a p- type region (22) that is isolated from the p- type substrate layer (18) by an n- type well region (20). The peripheral transistor section (14) has a p- type region (36) that can be isolated from the p- type substrate layer (18) by an optional n- type well region (40) for those devices which require a different substrate bias voltage between the peripheral transistor section (14) and the memory array section (16).
摘要:
A trench isolation structure including growing a layer of thermal oxide (114) on the silicon exposed in the trenches (110) prior to depositing the layer of insulating material, wherein the layer of thermal oxide (114) forms a lining on the trench. Depositing the layer of insulating material (120) comprises depositing a silicon oxide with an inductively-coupled high density plasma, wherein the plasma bias of the high density plasma is ramped from a low bias to a high bias
摘要:
A trench isolation structure including growing a layer of thermal oxide (114) on the silicon exposed in the trenches (110) prior to depositing the layer of insulating material, wherein the layer of thermal oxide (114) forms a lining on the trench. Depositing the layer of insulating material (120) comprises depositing a silicon oxide with an inductively-coupled high density plasma, wherein the plasma bias of the high density plasma is ramped from a low bias to a high bias