摘要:
The mobility of carriers may be increased in strained channel epitaxial source/drain transistors. Doped silicon material may be blanket deposited after removing ion implanted source/drain regions. The blanket deposition forms amorphous films over non-source/drain areas and crystalline films in source/drain regions. By using an etch which is selective to amorphous silicon, the amorphous material may be removed. This may avoid some problems associated with selective deposition of the doped silicon material.
摘要:
Numerous embodiments of a method for highly selective faceting of the S/D regions in a CMOS device are described. In one embodiment, source/drain regions are formed on a substrate. The source/drain regions are wet etched to form faceted regions. A silicon germanium layer is formed on the faceted regions of the source/drain regions to yield a strained device.
摘要:
An MOS transistor formed on a heavily doped substrate is described. Metal gates are used in low temperature processing to prevent doping from the substrate from diffusing into the channel region of the transistor.
摘要:
An MOS transistor formed on a heavily doped substrate is described. Metal gates are used in low temperature processing to prevent doping from the substrate from diffusing into the channel region of the transistor.
摘要:
An epitaxially deposited source/drain extension may be formed for a metal oxide semiconductor field effect transistor. A sacrificial layer may be formed and etched away to undercut under the gate electrode. Then a source/drain extension of epitaxial silicon may be deposited to extend under the edges of the gate electrode. As a result, the extent by which the source/drain extension extends under the gate may be controlled by controlling the etching of the sacrificial material. Its thickness and depth may be controlled by controlling the deposition process. Moreover, the characteristics of the source/drain extension may be controlled independently of those of the subsequently formed deep or heavily doped source/drain junction.
摘要:
A gate structure may be utilized as a mask to form source and drain regions. Then the gate structure may be removed to form a gap and spacers may be formed in the gap to define a trench. In the process of forming a trench into the substrate, a portion of the source drain region is removed. Then the substrate is filled back up with an epitaxial material and a new gate structure is formed thereover. As a result, more abrupt source drain junctions may be achieved.
摘要:
A gate structure may be utilized as a mask to form source and drain regions. Then the gate structure may be removed to form a gap and spacers may be formed in the gap to define a trench. In the process of forming a trench into the substrate, a portion of the source drain region is removed. Then the substrate is filled back up with an epitaxial material and a new gate structure is formed thereover. As a result, more abrupt source drain junctions may be achieved.
摘要:
An MOS transistor formed on a heavily doped substrate is described. Metal gates are used in low temperature processing to prevent doping from the substrate from diffusing into the channel region of the transistor.
摘要:
A gate structure may be utilized as a mask to form source and drain regions. Then the gate structure may be removed to form a gap and spacers may be formed in the gap to define a trench. In the process of forming a trench into the substrate, a portion of the source drain region is removed. Then the substrate is filled back up with an epitaxial material and a new gate structure is formed thereover. As a result, more abrupt source drain junctions may be achieved.
摘要:
The mobility of carriers may be increased in strained channel epitaxial source/drain transistors. Doped silicon material may be blanket deposited after removing ion implanted source/drain regions. The blanket deposition forms amorphous films over non-source/drain areas and crystalline films in source/drain regions. By using an etch which is selective to amorphous silicon, the amorphous material may be removed. This may avoid some problems associated with selective deposition of the doped silicon material.