摘要:
A field effect transistor (10) has an active layer (16) formed in a substrate (12). A gate (20) is disposed on an elevated platform (18) formed from the active layer (16). The elevated platform (18) raises the bottom surface (21) of the gate (20) relative to the top surface (34, 36) of the active region (13) on either side of the gate (20). A fabrication method for the transistor (10) forms the elevated platform (18) by etching the active region surface (44) on both sides of the gate (20) so that the bottom surface (21) of the gate (20) is elevated relative to the top surface (34) of the surrounding active region (13). The gate (20) itself and/or a patterned photoresist layer (116) may be used as a mask for performing this etch.
摘要:
A method of fabricating a MESFET is comprised of providing a semiconductor material 10 having a channel region 13 formed therein, forming a gate 14 on the semiconductor material 10 over the channel region 13, forming a spacer 18a adjacent a first portion of the gate 14 disposed on the semiconductor material, and forming a hard mask 18b disposed on a second portion of the gate 14 and on a portion of the semiconductor material 10.
摘要:
A method of fabricating a MESFET is comprised of providing a semiconductor material 10 having a channel region 13 formed therein, forming a gate 14 on the semiconductor material 10 over the channel region 13, forming a spacer 18a adjacent a first portion of the gate 14 disposed on the semiconductor material, and forming a hard mask 18b disposed on a second portion of the gate 14 and on a portion of the semiconductor material 10.
摘要:
A method of fabricating metal gate electrodes (18) in II-VI and III-V compound semiconductor FETs includes providing a II-VI or III-V compound semiconductor substrate (12) and forming a first portion (16) of a gate electrode (18) thereon. A hardmask (20) is formed on the first portion (16) of the gate electrode (18) and a planarizing dielectric layer (22) is formed on the substrate (12) surface including the hardmask (20) and first portion (16) of the gate electrode (18). The hardmask (20) is then exposed and removed. A second portion (28) of the gate electrode (18) is then formed on the first portion (16).