摘要:
A method of manufacturing a tunnel field effect transistor is disclosed. The method comprises forming a two-step profile in a silicon substrate (100) using a patterned hard mask (104) covering the higher steps of said profile; forming a gate stack (114, 116) against the side wall of the higher step; forming spacers (122) on either side of the gate stack (118); and implanting a first type impurity (124) in the higher step and an opposite type impurity in the neighboring lower step (120), wherein at least the first type impurity is implanted using an angled implanting step after removing the patterned hard mask (104). In a preferred embodiment, the method further comprises forming a sacrificial spacer (108) against a side wall of a higher step and the side wall of the hard mask (104); further etching the lower step (106, 110) next to said spacer (108) and subsequently growing a further semiconductor portion (112) on said lower step and removing the spacer (108) prior to forming the gate stack. Further disclosed is an IC comprising tunnel transistors manufactured in accordance with this method.
摘要:
A method of manufacturing a semiconductor device having gate electrodes of a suitable work function material is disclosed. The method comprises providing a substrate (100) including a number of active regions (110, 120) and a dielectric layer (130) covering the active regions (110, 120), and forming a stack of layers (140, 150, 160) over the dielectric layer. The formation of the stack of layers comprises depositing a first metal layer (140), having a first thickness, e.g. less than 10 nm, over the dielectric layer (130), depositing a second metal layer (150) having a second thickness over the first metal layer (140), the second thickness being larger than the first thickness, introducing a dopant (152, 154) into the second metal layer (150), exposing the device to an increased temperature to migrate at least some of the dopant (152, 154) from the second metal layer (150) beyond the interface between the first metal layer (140) and the second metal layer (150); and patterning the stack into a number of gate electrodes (170). This way a gate electrode is formed having an dopant profile in the vicinity of the dielectric layer (130) such that the work function of the gate electrode is optimized, without the gate dielectric suffering from degradation by dopant penetration.