摘要:
A method is provided for fabricating a semiconductor structure. The method includes providing a semiconductor substrate having a first region and an adjacent second region, and etching the semiconductor substrate to form a plurality of first trenches in the first region and a second trench in the second region. Fins are formed in between the adjacent first trenches. The width of the second trench is greater than the width of the first trench. The method also includes filling the first trenches with a first isolation material to form first insolation structures, and form sidewall spacers inside the second trench. Further, the method includes forming a third trench in the second trench by etching the exposed semiconductor substrate on the bottom of the second trench using the sidewall spacers as an etching mask, and filling the second trench and the third trench using a second isolation material to form a second isolation structure.
摘要:
A semiconductor device is described as including a first fin having a layer formed of a first semiconductor material and a second fin that is formed of a second semiconductor material. The first and second semiconductor materials are different. The second semiconductor material may have a mobility of P-type carriers that is greater than a mobility of P-type carriers of the first semiconductor material. The second fin includes a layer formed of the first semiconductor material below the layer formed of the second semiconductor material. The semiconductor device further includes a hard mask layer disposed on the first and second fins and an insulator layer disposed below the first and second fins. The first and second semiconductor materials include silicon and germanium, respectively. The first and second fins are used to form respective N-channel and a P-channel semiconductor devices.
摘要:
A semiconductor device with an amorphous silicon (a-Si) metal-aluminum oxide-semiconductor (MAS) memory cell structure. The device includes a substrate, a dielectric layer overlying the substrate, and one or more source or drain regions embedded in the dielectric layer with a co-planar surface of n-type a-Si and the dielectric layer. Additionally, the device includes a p-i-n a-Si diode junction. The device further includes an aluminum oxide charge trapping layer on the a-Si p-i-n diode junction and a metal control gate overlying the aluminum oxide layer. A method is provided for making the a-Si MAS memory cell structure and can be repeated to integrate the structure three-dimensionally.
摘要:
A method for manufacturing a twin bit cell structure with an aluminum oxide material includes forming a gate dielectric layer overlying a semiconductor substrate and a polysilicon gate structure overlying the gate dielectric layer. An undercut region is formed in each side of the gate dielectric layer underneath the polysilicon gate structure. Thereafter, an oxidation process is performed to form a first silicon oxide layer on a peripheral surface of the polysilicon gate structure and a second silicon oxide layer on an exposed surface of the semiconductor substrate. Then, an aluminum oxide material is deposited over the first and second silicon oxide layers including the undercut region and the gate dielectric layer. The aluminum oxide material is selectively etched to form an insert region in a portion of the undercut region. A sidewall spacer is formed to isolate and protect the exposed aluminum oxide material and the polysilicon gate structure.
摘要:
A semiconductor device and a manufacturing method thereof are provided. The fin semiconductor device includes a fin formed on a substrate and an insulating material layer formed on the substrate and surrounding the fin. The fin has a semiconductor layer that has a source region portion and a drain region portion. The fin includes a first channel control region, a second channel control region, and a channel region between the two channel control regions, all of which are positioned between the source region portion and the drain region portion. The two channel control regions may have the same conductivity type, different from the channel region.
摘要:
Various embodiments provide transistor devices and fabrication methods. An exemplary transistor device with improved carrier mobility can be formed by first forming a confining layer on a semiconductor substrate to confine impurity ions diffused from the semiconductor substrate to the confining layer. An epitaxial silicon layer can be formed on the confining layer, followed by forming a gate structure on the epitaxial silicon layer. A portion of the epitaxial silicon layer can be used as an intrinsic channel region. A source region and a drain region can be formed in portions of each of the epitaxial silicon layer, the confining layer, and the semiconductor substrate.
摘要:
A method and system for forming a non-volatile memory structure. The method includes providing a semiconductor substrate and forming a gate dielectric layer overlying a surface region of the semiconductor substrate. A polysilicon gate structure is formed overlying the gate dielectric layer. The method subjects the polysilicon gate structure to an oxidizing environment to cause formation of a first silicon oxide layer overlying the polysilicon gate structure and formation of an undercut region underneath the polysilicon gate structure. An aluminum oxide material is formed overlying the polysilicon gate structure filling the undercut region. In a specific embodiment, the aluminum oxide material has a nanocrystalline silicon material sandwiched between a first aluminum oxide layer and a second aluminum oxide layer. The aluminum oxide material is subjected to a selective etching process while maintaining the aluminum oxide material in an insert region in a portion of the undercut region. The method forms a sidewall structure overlying a side region of the polysilicon gate structure.
摘要:
A semiconductor device with an amorphous silicon (a-Si) metal-oxide-nitride-oxide-silicon (MONOS) or metal-aluminum oxide-silicon (MAS) memory cell structure with one-time programmable (OTP) function. The device includes a substrate, a first dielectric layer overlying the substrate, and one or more source or drain regions embedded in the first dielectric layer with a co-planar surface of n-type a-Si and the first dielectric layer. Additionally, the device includes a p-i-n a-Si diode junction. The device further includes a second dielectric layer on the a-Si p-i-n diode junction and a metal control gate overlying the second dielectric layer. Optionally the device with OTP function includes a conductive path formed between n-type a-Si layer and the metal control gate. A method of making the same memory cell structure is provided and can be repeated to integrate the structure three-dimensionally.
摘要:
A method for fabricating semiconductor devices, e.g., SONOS cell. The method includes providing a semiconductor substrate (e.g., silicon wafer, silicon on insulator) having a surface region, which has a native oxide layer. The method includes treating the surface region to a wet cleaning process to remove a native oxide layer from the surface region. In a specific embodiment, the method includes subjecting the surface region to an oxygen bearing environment and subjecting the surface region to a high energy electromagnetic radiation having wavelengths ranging from about 300 to about 800 nanometers for a time period of less than 10 milli-seconds to increase a temperature of the surface region to greater than 1000 Degrees Celsius. In a specific embodiment, the method causes formation of an oxide layer having a thickness of less than 10 Angstroms. In a preferred embodiment, the oxide layer is substantially free from pinholes and other imperfections. In a specific embodiment, the oxide layer is a gate oxide layer.
摘要:
A method for forming a nanocrystalline silicon structure for the manufacture of integrated circuit devices, e.g., memory, dynamic random access memory, flash memory, read only memory, microprocessors, digital signal processors, application specific integrated circuits. The method includes providing a semiconductor substrate including a surface region. The method forms an insulating layer (e.g., silicon dioxide, silicon nitride, silicon oxynitride) overlying the surface region. In a specific embodiment, the method includes forming an amorphous silicon material of a determined thickness of less than twenty nanometers overlying the insulating layer using a chloro-silane species. The method includes subjecting the amorphous silicon material to a thermal treatment process to cause formation of a plurality of nanocrsytalline silicon structures derived from the thickness of amorphous silicon material less than twenty nanometers.