摘要:
Semiconductor structures and methods for making semiconductor structures include a split gate non-volatile memory (NVM) cell in an NVM region. A charge storage layer, a first conductive layer, and a capping layer are formed over the substrate, which are patterned to form a control gate stack in the NVM region of the substrate. A high-k dielectric layer, a metal layer, and a second conductive layer are formed over the substrate. The second conductive layer and the metal layer are patterned to form remaining portions of the second conductive layer and the metal layer over and adjacent to a first side of the control gate stack. The remaining portion of the second conductive layer is removed to form a select gate stack, which includes the remaining portion of the metal layer. A stressor layer is formed over the substrate.
摘要:
A first transistor and a second transistor are formed with different threshold voltages. A first gate is formed over the first region of a substrate for a first transistor and a second gate over the second region for a second transistor. The first region is masked. A threshold voltage of the second transistor is adjusted by implanting through the second gate while masking the first region. Current electrode regions are formed on opposing sides of the first gate and current electrode regions on opposing sides of the second gate.
摘要:
A method of making a semiconductor structure uses a substrate having a background doping of a first type. A gate structure has a gate dielectric on the substrate and a select gate layer on the gate dielectric. Implanting is performed into a first portion of the substrate adjacent to a first end with dopants of a second type. The implanting is prior to any dopants being implanted into the background doping of the first portion which becomes a first doped region of the second type. An NVM gate structure has a select gate, a storage layer having a first portion over the first doped region, and a control gate over the storage layer. Implanting at a non-vertical angle with dopants of the first type forms a deep doped region under the select gate. Implanting with dopants of the second type forms a source/drain extension.
摘要:
A non-volatile memory device includes a substrate and a charge storage layer. The charge storage layer comprises a bottom layer of oxide, a layer of discrete charge storage elements on the bottom layer of oxide, and a top layer of oxide on the charge storage elements. A control gate is on the top layer of oxide. A surface of the top layer of oxide facing a surface of the control gate is substantially planar.
摘要:
A method for forming a semiconductor device includes forming a first plurality of nanocrystals over a surface of a substrate having a first region and a second region, wherein the first plurality of nanocrystals is formed in the first region and the second region and has a first density; and, after forming the first plurality of nanocrystals, forming a second plurality of nanocrystals over the surface of the substrate in the second region and not the first region, wherein the first plurality of nanocrystals together with the second plurality of nanocrystals in the second region result in a second density, wherein the second density is greater than the first density.
摘要:
A semiconductor device is formed in a semiconductor layer. A gate stack is formed over the semiconductor layer and comprises a first conductive layer and a second layer over the first layer. The first layer is more conductive and provides more stopping power to an implant than the second layer. A species is implanted into the second layer. Source/drain regions are formed in the semiconductor layer on opposing sides of the gate stack. The gate stack is heated after the step of implanting to cause the gate stack to exert stress in the semiconductor layer in a region under the gate stack.
摘要:
A semiconductor device comprises a semiconductor substrate and a select gate structure over a first portion of the semiconductor substrate. The select gate structure comprises a sidewall forming a corner with a second portion of the semiconductor substrate and a charge storage stack over an area comprising the second portion of the semiconductor substrate, the sidewall, and the corner. A corner portion of a top surface of the charge storage stack is non-conformal with the corner, and the corner portion of the top surface of the charge storage stack has a radius of curvature measuring approximately one-third of a thickness of the charge storage stack over the second portion of the substrate or greater. A control gate layer is formed over the charge storage stack. A portion of the control gate layer conforms to the corner portion of the top surface of the charge storage stack.
摘要:
A split gate nonvolatile memory cell on a semiconductor layer is made by forming a gate dielectric over the semiconductor layer. A first layer of gate material is deposited over the gate dielectric. The first layer of gate material is etched to remove a portion of the first layer of gate material over a first portion of the semiconductor layer and to leave a select gate portion having a sidewall adjacent to the first portion. A treatment is applied over the semiconductor layer to reduce a relative oxide growth rate of the sidewall to the first portion. Oxide is grown on the sidewall to form a first oxide on the sidewall and on the first portion to form a second oxide on the first portion after the applying the treatment. A charge storage layer is formed over the first oxide and along the second oxide. A control gate is formed over the second oxide and adjacent to the sidewall.
摘要:
A method is disclosed for making a non-volatile memory cell on a semiconductor substrate. A select gate structure is formed over the substrate. The control gate structure has a sidewall. An epitaxial layer is formed on the substrate in a region adjacent to the sidewall. A charge storage layer is formed over the epitaxial layer. A control gate is formed over the charge storage layer. This allows for in-situ doping of the epitaxial layer under the select gate without requiring counterdoping. It is beneficial to avoid counterdoping because counterdoping reduces charge mobility and increases the difficulty in controlling threshold voltage. Additionally there may be formed a recess in the substrate and the epitaxial layer is formed in the recess, and a halo implant can be performed, prior to forming the epitaxial layer, through the recess into the substrate in the area under the select gate.
摘要:
A semiconductor device is formed in a semiconductor layer. A gate stack is formed over the semiconductor layer and comprises a first conductive layer and a second layer over the first layer. The first layer is more conductive and provides more stopping power to an implant than the second layer. A species is implanted into the second layer. Source/drain regions are formed in the semiconductor layer on opposing sides of the gate stack. The gate stack is heated after the step of implanting to cause the gate stack to exert stress in the semiconductor layer in a region under the gate stack.