Method for manufacturing field effect transistor
View Patent ↗The manufacturing stability can be improved while effectively inhibiting the short-channel effect in the transistor according to the present invention. A halo impurity having a conductivity type opposite to a first conductivity type of a first impurity is ion-implanted into the silicon substrate 101 , and thereafter the first impurity having the first conductivity type, is ion-implanted and then a flash lamp annealing is conducted to form a p-type halo region 113 and a n-type extension region 111 . Then, the second impurity having the first conductivity type is ion-implanted into the silicon substrate 101 , and then a flash lamp annealing is conducted to form a n-type source/drain region 109 . Then, the impurity contained in the silicon substrate 101 is activated via spike RTA.
1. A method for manufacturing a field effect transistor, comprising:
forming a gate electrode on an element formation surface of a semiconductor substrate and providing a halo region and an extension region in regions of said semiconductor substrate being in vicinity of said gate electrode;
providing a source/drain region in said semiconductor substrate, after said providing the halo region and the extension region; and
activating an impurity contained in an impurity-implanted region by heating said semiconductor substrate via a spike rapid thermal annealing (RTA), after said providing the source/drain region,
wherein said providing the halo region and the extension region includes a first ion implantation process that comprises ion-implanting a first impurity having a first conductivity type into said semiconductor substrate, and a first flash lamp annealing process that comprises flash lamp annealing said semiconductor substrate after said first ion implantation process, and
wherein said providing the source/drain region includes a second ion implantation process that comprises ion-implanting a second impurity having said first conductivity type into said semiconductor substrate after said first flash lamp annealing process, and a second flash lamp annealing process that comprises flash lamp annealing said semiconductor substrate after said second ion implantation process.
2. The method according to claim 1 , wherein said activating the impurity contained in the impurity-implanted region by heating the semiconductor substrate via the spike RTA includes elevating a temperature of said element formation surface at a rate of equal to or higher than 150 degree C./sec.
3. The method according to claim 1 , wherein said activating the impurity contained in the impurity-implanted region by heating the semiconductor substrate via the spike RTA includes heating said element formation surface to a temperature of equal to or higher than 1,000 degree C.
4. The method according to claim 1 , wherein said providing the halo region and the extension region comprises ion-implanting an impurity having a second conductivity type into said semiconductor substrate before said first ion implantation process, and said activating the impurity contained in the impurity-implanted region by heating the semiconductor substrate via the spike RTA includes activating the impurity having said first conductivity type and the impurity having said second conductivity type.
5. The method according to claim 2 , wherein said providing the halo region and the extension region comprises ion-implanting an impurity having a second conductivity type into said semiconductor substrate before said first ion implantation process, and said activating the impurity contained in the impurity-implanted region by heating the semiconductor substrate via the spike RTA includes activating the impurity having said first conductivity type and the impurity having said second conductivity type.
6. The method according to claim 3 , wherein said providing the halo region and the extension region comprises ion-implanting an impurity having a second conductivity type into said semiconductor substrate before said first ion implantation process, and said activating the impurity contained in the impurity-implanted region by heating the semiconductor substrate via the spike RTA includes activating the impurity having said first conductivity type and the impurity having said second conductivity type.
7. The method according to claim 1 , further comprising: after said activating the impurity, providing a silicide layer on an upper portion of said gate electrode and on an upper portion of said source/drain region.
8. The method according to claim 2 , further comprising: after said activating the impurity, providing a silicide layer on an upper portion of said gate electrode and on an upper portion of said source/drain region.
9. The method according to claim 3 , further comprising: after said activating the impurity, providing a silicide layer on an upper portion of said gate electrode and on an upper portion of said source/drain region.
10. The method according to claim 4 , further comprising: after said activating the impurity, providing a silicide layer on an upper portion of said gate electrode and on an upper portion of said source/drain region.