摘要:
A method for forming an oxynitride gate dielectric layer (202, 204) begins by providing a semiconductor substrate (200). This semiconductor substrate is cleaned via process steps (10-28). Optional nitridation and oxidation are performed via steps (50 and 60) to form a thin interface layer (202). Bulk oxynitride gate deposition occurs via a step (70) to form a bulk gate dielectric material (204) having custom tailored oxygen and nitrogen profile and concentration. A step (10) is then utilized to in situ cap this bulk dielectric layer (204) with a polysilicon or amorphous silicon layer (208). The layer (208) ensures that the custom tailors oxygen and nitrogen profile and concentration of the underlying gate dielectric (204) is preserved even in the presence of subsequent wafer exposure to oxygen ambients.
摘要:
A method for forming an oxynitride gate dielectric layer (202, 204) begins by providing a semiconductor substrate (200). This semiconductor substrate is cleaned via process steps (10-28). Optional nitridation and oxidation are performed via steps (50 and 60) to form a thin interface layer (202). Bulk oxynitride gate deposition occurs via a step (70) to form a bulk gate dielectric material (204) having custom tailored oxygen and nitrogen profile and concentration. A step (10) is then utilized to in situ cap this bulk dielectric layer (204) with a polysilicon or amorphous silicon layer (208). The layer (208) ensures that the custom tailors oxygen and nitrogen profile and concentration of the underlying gate dielectric (204) is preserved even in the presence of subsequent wafer exposure to oxygen ambients.
摘要:
A process for reducing halogen concentration in a material layer (56) includes the deposition of a dielectric layer (58) overlying the material layer (56). An annealing process is carried out to diffuse halogen atoms from the material layer (56) into the overlying dielectric layer (58). Once the diffusion process is complete, the dielectric layer (58) is removed.
摘要:
A process for the fabrication of an MOSFET device includes the formation of a buffer layer (28) overlying the surface of a semiconductor substrate (14) adjacent to a gate electrode (18). A defect compensating species is diffused through the buffer layer (28) and through a gate dielectric layer (12) to form a defect-compensating region (30) at the surface (14) of the semiconductor substrate (10). The defect-compensating region (30) in conjunction with the buffer layer (28) minimize and control the population of point defects in the channel region (22) of the semiconductor substrate (10). By controlling the population of point defects in the channel region (22), a substantially uniform doping profile is maintained in a shallow doped region (16) formed in the semiconductor substrate (10) at the substrate surface (14). The maintenance of a uniform doping profile in the shallow doped region (16) results in improved threshold voltage stability as the lateral dimension of the channel region (22) is reduced.
摘要:
An annealed amorphous silicon layer is formed prior to forming field isolation regions when using in a LOCOS field isolation process. The annealed amorphous silicon layer helps to reduce encroachment compared to conventional LOCOS field isolation process and helps to reduce the likelihood of forming pits within a substrate compared to a PBL field isolation process. The annealed amorphous silicon layer may be used in forming field isolation regions that defines the active regions between transistors including MOSFETs and bipolar transistors. Doped silicon or a silicon-rich silicon nitride layer may be used in place of conventional materials. The anneal of the amorphous silicon layer may be performed after forming a silicon nitride layer if the silicon nitride layer is deposited at a temperature no higher than 600 degrees Celsius.
摘要:
A semiconductor dielectric (10) is formed by providing a base layer (12) having a surface. A thin interface layer (13) is formed at the surface of the base layer (12). The thin interface layer has a substantial concentration of both nitrogen and fluorine. A thermal oxide layer (14) is formed overlying the interface layer (13). A deposited dielectric layer (16) is formed overlying the thermal oxide layer (14). The deposited dielectric layer (16) is optionally densified by a thermal heat cycle. The deposited dielectric layer (16) has micropores that are misaligned to micropores in the thermal oxide layer (14) to provide enhanced features which the nitrogen/fluorine interface further improves the dielectric's features.
摘要:
An annealed amorphous silicon layer is formed prior to forming field isolation regions when using in a LOCOS field isolation process. The annealed amorphous silicon layer helps to reduce encroachment compared to conventional LOCOS field isolation process and helps to reduce the likelihood of forming pits within a substrate compared to a PBL field isolation process. The annealed amorphous silicon layer may be used in forming field isolation regions that defines the active regions between transistors including MOSFETs and bipolar transistors. Doped silicon or a silicon-rich silicon nitride layer may be used in place of conventional materials. The anneal of the amorphous silicon layer may be performed after forming a silicon nitride layer if the silicon nitride layer is deposited at a temperature no higher than 600 degrees Celsius.
摘要:
A method for forming a gate dielectric (14b) begins by providing a substrate (12). A high K dielectric layer (14a) is deposited overlying the substrate (12). The dielectric layer (14a) contains bulk traps (16) and interface traps (18). A polysilicon gate electrode (20) is then patterned and etched overlying the gate dielectric (14a) whereby the plasma etching of the gate electrode (20) results in substrate plasma damage (22). A post gate wet oxidation process is performed between 750.degree. C. and 850.degree. C. to reduce plasma etch damage and trap sites (16, 18) in order to provide an improved gate dielectric (14b). Source and drain electrodes (30) are then formed within the substrate and laterally adjacent the gate electrode (20) to form a transistor device having more consistent threshold voltages, improved subthreshold slope operation, reduced gate to channel leakage, and improved speed of operation.
摘要:
A semiconductor dielectric (10) is formed by providing a base layer (12) having a surface. A thin interface layer (13) is formed at the surface of the base layer (12). The thin interface layer has a substantial concentration of one of either nitrogen or fluorine. A thermal oxide layer (14) is formed overlying the interface layer (13). A deposited dielectric layer (16) is formed overlying the thermal oxide layer (14). The deposited dielectric layer (16) is optionally densified by a thermal heat cycle. The deposited dielectric layer (16) has micropores that are misaligned to micropores in the thermal oxide layer (14) to provide enhanced features.
摘要:
This disclosure reveals a manufacturable and controllable method to fabricate a dielectric which increases the device current drive. A nitrogen-containing ambient is used to oxidize a surface of a substrate (10) to form a nitrogen-containing dielectric (12). Then a fluorine-containing specie (F) is introduced, preferably through implanting, into a gate electrode (20) overlying the nitrogen-containing dielectric. The fluorine is then driven into the underlying nitrogen-containing dielectric. A fluorinated nitrogen-containing region (14') is expected to form at the interface between dielectric (12') and substrate (10). The interaction between fluorine and nitrogen increases the peak transconductance as well as the transconductance at a high electric field for the dielectric. Therefore, the overall current drive is increased by this approach.