摘要:
A method of fabricating a deep trench capacitor is described. A substrate having a deep trench therein is provided. A doped region is formed in the substrate at the bottom of the deep trench, a dielectric layer is formed on the bottom surface of the deep trench, and a first conductive layer is formed on the dielectric layer. A collar oxide layer is formed on sidewalls of the deep trench that are not covered by the first conductive layer. A material layer is formed covering the first conductive layer and exposing a portion of the collar oxide layer. The exposed collar oxide layer is removed to expose the substrate. Then, the material layer is removed, and a second conductive layer is formed in the deep trench covering the first conductive layer and the collar oxide layer. In this invention, only the second conductive layer is formed on the first conductive layer for electrically connecting the capacitor and an active device, hence the method is more simple.
摘要:
This invention pertains to a method for making a trench capacitor of DRAM devices. A portion of the collar oxide layer is masked after the second polysilicon deposition and recess etching process. Subsequently, the un-masked collar oxide layer is etched away to form an asymmetric collar oxide structure. The third polysilicon deposition and recess etching process is then carried out to form a third polysilicon stud atop the second polysilicon layer. The asymmetric collar oxide structure has a lower annular portion wrapping the second polysilicon layer and insulating the second polysilicon layer from the substrate, and an upper portion serving as a single-sided spacer for blocking diffusion of dopants from the third polysilicon stud to the substrate.
摘要:
Method for forming buried plates. The method includes providing a substrate formed with a pad stacked layer on the surface, a bottle trench and a protective layer on the upper sidewalls of the bottle trench, forming a doped hemispherical silicon grain (HSG) layer on the protective layer and the sidewalls and bottom of the bottle trench, removing the hemispherical silicon grain layer on the protective layer without removing the hemispherical silicon grain layer from the lower sidewalls and bottom of the bottle trench, forming a covering layer on the protective layer, and subjecting the doped hemispherical silicon grain layer to drive-in annealing so that ions in the HSG layer diffuse out to the substrate, thereby forming a buried plate within the lower sidewalls of the bottle trench.
摘要:
A method for removing black silicon in semiconductor fabrication is disclosed. First, a trench is formed in a semiconductor substrate having a pad dielectric layer and a hard mask layer. Then, the hard mask layer is removed. A photoresist layer covers the trench and only black silicon created at the edge of the semiconductor substrate during formation of the trench is left uncovered. Finally, the black silicon is removed.
摘要:
A method for fabricating LOCOS isolation having a planar surface. The method utilizes a polysilicon spacer to prevent bird beak. The method adds the steps of forming a polishing stop layer and removing said edge-protrusion portion of the local oxide by chemical mechanical polishing.
摘要:
A connector assembly (1000) includes a first connector (100) having a first insulative housing (11), a plurality of first terminals (12) supported by the first insulative housing and at least one latching member (13) combined with the first insulative housing, the latching member (13) having two locking arms (132) spaced apart from each other along a longitudinal direction; a second connector (200) having a second insulative housing (21), a plurality of second terminals (22) supported by the second insulative housing and at least one clasping member (23) combined with the second insulative housing, the clasping member (23) having a rigid longitudinal bar (232) with two free ends protruding at opposite directions; and wherein the rigid longitudinal bar is sandwiched between the two locking arms and the two free ends engaged with the two locking arms when the first connector mates with the second connector.
摘要:
An electrical connector assembly includes a first connector and a second connector each defining a mating end of a regular polygon mating with each other. Each regular polygon defines a center, an imaginary circle around the center and a plurality of vertices at the imaginary circle. A plurality of pins are located at the mating ends which composed of one first pin at the center of the first connector, two second pins at least fulfilling with one half of the vertices and arranged at adjacent vertices in turn, one third pin at the center of the second connector and two forth pins at the vertices respectively in a condition that said two forth pins spaced from each other with a largest distance.
摘要:
An electrical connector mounted on a PCB (printed circuit board) includes an insulating housing having a receiving room and a plurality of contacts retained in the insulating housing. Said insulating housing has a tongue portion and a peripheral wall surrounds said tongue portion which defines said receiving room. Each contact includes a U-shaped contacting portion received in said receiving room, a vertical holding portion retained in an inner surface of said peripheral wall and a connecting portion connecting with said contacting portion and said holding portion. Said connecting portion has a linear leading surface which is formed slanted towards said contacting portion downwardly in order to provide a smooth mating process with a mating connector.