摘要:
The present invention pertains to implementing a dual poly process in forming a transistor based memory device. The process allows a first polysilicon layer to be selectively doped subsequent to deposition of the second polysilicon layer. The doping increases the conductivity of the first polysilicon layer which can achieve a more robust charging protection for multi-bit core array and a more uniform distribution of charge.
摘要:
The present invention pertains to implementing a dual poly process in forming a transistor based memory device. The process allows a first polysilicon layer to be selectively doped subsequent to deposition of the second polysilicon layer. The doping increases the conductivity of the first polysilicon layer which can achieve a more robust charging protection for multi-bit core array and a more uniform distribution of charge.
摘要:
Novel fabrication methods implement the use of dummy tiles to avoid the effects of in-line charging, ESD events, and such charge effects in the formation of a memory device region region. One method involves forming at least a portion of a memory core array upon a semiconductor substrate that involves forming STI structures in the substrate substantially surrounding a memory device region region within the array. An oxide layer is formed over the substrate in the memory device region region and over the STI's, wherein an inner section of the oxide layer formed over the memory device region region is thicker than an outer section of the oxide layer formed over the STI's. A first polysilicon layer is then formed over the inner and outer sections comprising one or more dummy tiles formed over one or more outer sections and electrically connected to at least one inner section.
摘要:
The present invention pertains to a system and method for implementing dummy tiles in forming a memory device. The system and method involves forming at least a portion of a memory core array upon a semiconductor substrate comprising, forming STI structures in the substrate, depositing an oxide layer over the substrate, forming a first polysilicon layer over the oxide layer, doping the first polysilicon layer, forming a second polysilicon layer over the first polysilicon layer, patterning at least one memory core, patterning at least one dummy tile and performing back end processing.
摘要:
Methods are disclosed for fabricating dual bit SONOS flash memory cells, comprising forming polysilicon gate structures over an ONO layer, and doping source/drain regions of the substrate using the gate structures as an implant mask. Methods are also disclosed in which dielectric material is formed over and between the gate structures, and the wafer is planarized using an STI CMP process to remove dielectric material over the polysilicon gate structures.
摘要:
A structure for protecting an NROM from induced charge damage during device fabrication is described. The structure provides a discharge path for charge accumulated on the polygate layer during fabrication while providing sufficient isolation to ensure normal circuit operation.
摘要:
One aspect of the present invention relates to a method of forming a SONOS type non-volatile semiconductor memory device, involving forming a first layer of a charge trapping dielectric on a semiconductor substrate; forming a second layer of the charge trapping dielectric over the first layer of the charge trapping dielectric on the semiconductor substrate; optionally at least partially forming a third layer of the charge trapping dielectric over the second layer of the charge trapping dielectric on the semiconductor substrate; optionally removing the third layer of the charge trapping dielectric; forming a source/drain mask over the charge trapping dielectric; implanting a source/drain implant through the charge trapping dielectric into the semiconductor substrate; optionally removing the third layer of the charge trapping dielectric; and one of forming the third layer of the charge trapping dielectric over the second layer of the charge trapping dielectric on the semiconductor substrate, reforming the third layer of the charge trapping dielectric over the second layer of the charge trapping dielectric on the semiconductor substrate, or forming additional material over the third layer of the charge trapping dielectric.
摘要:
The present invention, in one embodiment, relates to a process for fabricating a charge trapping dielectric flash memory device including steps of providing a semiconductor substrate having formed thereon a gate stack comprising a charge trapping dielectric charge storage layer and a control gate electrode overlying the charge trapping dielectric charge storage layer; forming an oxide layer over at least the gate stack; and depositing a spacer layer over the gate stack, wherein the depositing step deposits a spacer material having a reduced hydrogen content relative to a hydrogen content of a conventional spacer material.
摘要:
Semiconductor devices with improved data retention are formed by depositing an undoped oxide liner on spaced apart transistors followed by in situ deposition of a BPSG layer. Embodiments include depositing an undoped silicon oxide liner derived from TEOS, as at a thickness of 400 Å to 600 Å, on transistors of a non-volatile semiconductor device, as by sub-atmospheric chemical vapor deposition, followed by depositing the BPSG layer in the same deposition chamber.
摘要:
The present invention pertains to utilizing a salicide in establishing alignment marks in semiconductor fabrication. A metal layer is formed over exposed portions of a silicon substrate as well as oxide areas formed over bitlines buried within the substrate. The metal layer is treated to react with the exposed portions of the silicon substrate to form salicided areas. The metal layer does not, however, react with the oxide areas. As such, salicided areas are formed adjacent to the oxide areas to provide an enhanced optical contrast when light is shined there-upon. In this manner, the alignment marks can be more readily “seen”. The enhanced optical contrast thus allows the marks to continue to be seen as scaling occurs.