Abstract:
A method of fabricating a capacitor electrode. A stack structure is formed on a substrate, and the stack structure includes a first conductive layer, a first sacrificial layer, and a second sacrificial layer. The stack structure includes a first sidewall and a second sidewall facing the first sidewall. A conductive sidewall is formed on the first sidewall and the second sidewall to electrically connect the first conductive layer to the second conductive layer. Finally, the first and the second sacrificial layers are removed.
Abstract:
In a manufacturing method of a non-volatile memory, a substrate is provided, and strip-shaped isolation structures are formed in the substrate. A first memory array including memory cell columns is formed on the substrate. Each memory cell column includes memory cells connected in series with one another, a source/drain region disposed in the substrate outside the memory cells, select transistors disposed between the source/drain region and the memory cells, control gate lines extending across the memory cell columns and in a second direction, and first select gate lines respectively connecting the select transistors in the second direction in series. First contacts are formed on the substrate at a side of the first memory array and arranged along the second direction. Each first contact connects the source/drain regions in every two adjacent active regions.
Abstract:
A method for manufacturing a non-volatile memory is provided. An isolation structure is formed in a trench formed in a substrate. A portion of the isolation structure is removed to form a recess. A first dielectric layer and a first conductive layer are formed sequentially on the substrate. Bar-shaped cap layers are formed on the substrate. The first conductive layer not covered by the bar-shaped cap layers is removed to form first gate structures. A second dielectric layer is formed on the sidewalls of the first gate structures. A third dielectric layer is formed on the substrate between the first gate structures. A second conductive layer is formed on the third dielectric layer. The bar-shaped cap layers and a portion of the first conductive layer are removed to form second gate structures. A doped region is formed in the substrate at two sides of each of the second gate structures.
Abstract:
A flash memory is provided. The flash memory features of having the select gate transistors to include two different channel structures, which are a recessed channel structure and a horizontal channel. Because of the design of the recessed channel structure, the space between the gate conductor lines, which are for interconnecting the select gates of the select gate transistors arranged on the same column, can be shortened. Therefore, the integration of the flash memory can be increased; and the process window of the STI process can be increased as well. In addition, at least one depletion-mode select gate transistor is at one side of the memory cell string. The select gate transistor of the depletion-mode is always turned on.
Abstract:
A floating gate and fabrication method thereof. A semiconductor substrate is provided, on which an oxide layer, a first conducting layer, and a patterned hard mask layer having an opening are sequentially formed. A spacer is formed on the sidewall of the opening. A second conducting layer is formed on the hard mask layer. The second conducting layer is planarized to expose the surface of the patterned hard mask layer. The surface of the second conducting layer is oxidized to form an oxide layer. The patterned hard mask layer and the oxide layer and the first conducting layer underlying the patterned hard mask layer are removed.
Abstract:
A process for forming shallow trench isolation region with corner protection layer. A protection layer is formed within the opening that defines the isolation trench as part of the etching mask such that the etching rate of the protection layer is less than the mask layer and the pad insulating layer to the etchant used to remove the mask layer and pad insulating layer. The protection layer is partially removed and left adjacent to the shallow trench isolation region as a corner protection layer after removing the mask layer and pad insulating layer. Thus, the indentation next to the corner of the isolation region is avoided.
Abstract:
A floating gate with multiple tips and a fabrication method thereof. A semiconductor substrate is provided, on which a patterned hard mask layer is formed, wherein the patterned hard mask layer has an opening. A gate dielectric layer and a first conducting layer with a first predetermined thickness are formed on the bottom of the opening. A spacer is formed on the sidewall of the opening. A conducting spacer is formed on the sidewall of the spacer. The first conducting layer is etched to a second predetermined thickness. A multi-tip floating gate is provided by the first conducting layer and the conducting spacer. A protecting layer is formed in the opening. The patterned hard mask layer, the gate dielectric layer, a portion of the protecting layer, and a portion of the first spacer are etched to expose the surface of the first conducting layer.
Abstract:
A method for manufacturing a split-gate flash memory cell, comprising the steps of forming an active region on a semiconductor substrate; forming a buffer layer on the semiconductor substrate; forming a first dielectric layer on the buffer layer; removing part of the first dielectric layer; defining an opening; removing the buffer layer within the opening; forming a gate insulating layer and floating gates; forming a source region in the semiconductor substrate; depositing a conformal second dielectric layer on the opening; removing the buffer layer outside the first dielectric layer and the floating gates; and forming an oxide layer and control gates.
Abstract:
A method of fabricating a flash memory cell. The method includes the steps of providing a semiconductor substrate; forming a first gate insulating layer; forming a first conductive layer on the first gate insulating layer; forming a floating gate insulating layer; forming a source region by implanting impurity ions into the substrate; forming a second insulating layer; forming a floating gate region; forming a third insulating; forming a second conductive layer on the third insulating layer; forming a fourth insulating layer on the second conductive layer; forming a floating gate region; forming a second conductive layer on the third insulating layer; forming first sidewall spacers; forming control gates and a tunneling oxide; forming second sidewall spacers; and forming a drain region on the substrate.
Abstract:
A shallow trench isolation having an etching stop layer and its method of fabrication. The method utilizes a shield layer such as a silicon nitride layer to serve as an etching stop layer. The etching stop layer is formed in the top position of the shallow trench isolation.