摘要:
A new CMOS device which avoids latchup while achieving a spacing between the n-channel and p-channel FETs of the device smaller than 10 .mu.m, as well as a method for fabricating the choice, is disclosed. The inventive device, which is formed in a substrate comprising a relatively heavily doped bulk region supporting a relatively thin, moderately doped layer, includes a polysilicon-filled trench extending through a portion of the layer, between the n- and p-channel FETs of the device. The inventive device also includes a relatively heavily doped region extending from a bottom of the trench to the bulk region. The polysilicon-filled trench, in combination with both the relatively heavily doped region and bulk region, prevents latchup.
摘要:
A new CMOS device which avoids latchup while achieving a spacing between the n-channel and p-channel FETs of the device smaller than 10 .mu.m, as well as a method for fabricating the device, is disclosed.The inventive CMOS device includes a latchup-preventing, polysilicon-filled trench formed in the semiconductor substrate between the n- and p-channel FETs of the device. The polysilicon-filled trench is essentially free of crack-inducing voids, and achieves a width less than 10 .mu.m, because the angle between the trench sidewall and a perpendicular drawn to the substrate surface is greater than, or equal to, about 5 degrees but less than about 10 degrees. Also, a thickness of the polysilicon deposited into the trench is greater than half the width of the trench.
摘要:
A new CMOS device which avoids latchup while achieving a spacing between the n-channel and p-channel FETs of the device smaller than 10 .mu.m, as well as a method for fabricating the choice, is disclosed.The inventive device, which is formed in a substrate comprising a relatively heavily doped bulk region supporting a relatively thin, moderately doped layer, includes a polysilicon-filled trench extending through a portion of the layer, between the n- and p-channel FETs of the device. The inventive device also includes a relatively heavily doped region extending from a bottom of the trench to the bulk region. The polysilicon-filled trench, in combination with both the relatively heavily doped region and bulk region, prevents latchup.
摘要:
A new method for fabricating CMOS devices, as well as the resulting devices, is disclosed. The method involves incorporating dopants into a semiconductor substrate through a region of the substrate surface, and diffusing the implanted dopants into the substrate to form a tub. Prior to the diffusion step, a trench is formed in, and extending beneath, the surface which partially or completely encircles the region. The trench serves to prevent the formation, or reduce the size, of a relatively low dopant concentration region, which would otherwise lead to undesirable leakage currents in the completed CMOS device, and prevents latchup.
摘要:
A lightly-doped drain (LDD) structure has conductive shield overlying the lightly-doped drain and source portions to collect and/or remove hot carriers which can otherwise cause instabilities such as gain degradation and threshold voltage shifts in short-channel MOS devices. The hot carriers eventually deteriorate the performance of the transistor to the point where the transistor provides insufficient performance. Thus, the lifetime of a transistor is affected by the degradation caused by the formation of hot carriers. The lifetime is increased by collecting the hot carriers in the conductive material over the lightly-doped source and drain.
摘要:
A process for forming n- and p-wells in a semiconductor substrate wherein each well has a shallow, highly-doped surface layer whose depth may be independently controlled. This high/low doping profile for a twin well CMOS process may be produced using only one mask level. The method provides high/low impurity profiles in each well to optimize the NMOS and PMOS active transistors; provides close NMOS to PMOS transistor spacing; avoids a channel-stop mask level and avoids a threshold adjustment/punchthrough mask level.
摘要:
Embodiments disclosed herein describe systems and methods for a hanging device including slides configured to align the hanging device at desired positions with the frame and on a wall. Embodiments may be configured to be aligned with a frame in both horizontal and vertical directions.
摘要:
Embodiments disclosed herein describe systems and methods for a hanging device including slides configured to align the hanging device at desired positions with the frame and on a wall. Embodiments may be configured to be aligned with a frame in both horizontal and vertical directions.
摘要:
A metal interconnect structure includes copper interface layers (24, 30) located between a refractory metal via plug (28), and first and second metal interconnect layers (16, 32). The copper interface layers (24, 30) are confined to the area of a via opening (22) in an insulating layer (20) overlying the first interconnect layer (16) and containing the via plug (28). The interface layers (24, 30) are subjected to an anneal to provide copper reservoirs (36, 37) in the interconnect layers (16, 32) adjacent to the interface layers (24, 30). The copper reservoirs (36, 37) continuously replenish copper depleted from the interface when an electric current is passed through the interconnect structure. A process includes the selective deposition of copper onto an exposed region (23) of the first metal interconnect layer (16), and onto the upper portion the via plug (28), followed by an anneal in forming gas to form the copper reservoirs (36, 37).
摘要:
A process of forming a conductive material layer in at least two steps by forming a conductive material layer from a plurality of thin layers of conductive material. The use of a two-step formation process for the conductive material layer permits process versatility in incorporating implantation steps and patterning steps between formation of the thin layers of conductive material. Direct transfer from dielectric layer formation to conductive material layer formation steps, and performing the intermediate process steps in the same piece of equipment as the thin conductive layer formation assists in adhesion of the thin layers to each other to form the total conductive material layer. The use of in situ doped semiconductor material, such as in situ doped polycrystalline silicon and in situ doped amorphous silicon reduces the exposure of other dopants that may be present to thermal cycles of high temperature, greater than 900.degree. C., that causes these dopants to migrate undesirably.