摘要:
A power field effect transistor is disclosed that includes polysilicon gate bodies (40) and (42), which includes platinum silicide contact layers (74) and (78) disposed on the outer surfaces of bodies (40) and (42), respectively. In addition, the device comprises an n+drain region (64) which also has a platinum silicide drain contact layer (76) formed on its outer surface and platinum silicide source contact layers (75) and (77). During formation, sidewall spacers (50) and (52), as well as mask bodies (70) and (72) are used to ensure that platinum silicide layer (76) spaced apart from both gate bodies (40) and (42) and platinum silicide gate contact layers (74) and (78).
摘要:
An LDMOS device (10, 20, 50, 60) that is made with minimal feature size fabrication methods, but overcomes potential problems of misaligned Dwells (13). The Dwell (13) is slightly overstated so that its n-type dopant is implanted past the source edge of the gate region (18), which permits the n-type region of the Dwell to diffuse under the gate region (18) an sufficient distance to eliminate misalignment effects.
摘要:
An integrated circuit device (10) with a bonding surface (12) directly over its active circuitry, and a method of making such integrated circuits (FIGS. 2A-2E). To make the bonding surface (12), a wafer (20) is provided with vias (24) to its metallization layer (21) and then coated with a seed metal layer (25). A plating pattern (26) is formed on the wafer (20), exposing portions of the seed metal layer (25) and blocking the rest of the seed metal layer (25). These exposed portions are plated with successive metal layers (27, 28, 29), thereby forming a bonding surface (12) having a number of layered stacks (200) that fill the vias (24). The plating pattern and the nonplated portions of the seed metal layer (25) are then removed.
摘要:
An integrated circuit having PMOS, NMOS and NPN transistors is described for applications in which both digital and analog circuits are required. The integrated circuit is designed to allow standard CMOS cells to be used in the integrated circuit without redesign. A P+ substrate (48) is provided upon which a first P- epitaxy layer (46) is formed. N+ DUF regions (50,52) are provided for the PMOS and NPN transistors, respectively. The base region (68) is formed in an Nwell (58) by implantation and diffusion. Before diffusion, a nitride layer (70) is formed over the base (68) to provided an inert annealing thereof. The base diffusion and collector diffusion occurs before the CMOS channel stop and source/drain diffusions in order to prevent altering diffusion times for the MOS transistors.
摘要:
A method for increasing the operating voltage of a transistor formed on a substrate of a first conductivity region of a second conductivity type in a surface of the substrate. An N-well adjust region of the first conductivity type is then formed in the N-well region. The N-well adjust region extends to a first depth in the N-well region. A double diffusion well of the first conductivity type is then formed in the N-well. The double diffusion well extends to a second depth greater than the first depth of the N-well adjust region, and contains a portion of the N-well. Two N- channel stop regions are then formed in the N-well. The two N-channel stop regions extending to a third depth greater than the depth of the N-well adjust region, and contain a portion of the N-well.
摘要:
A method for making an EEPROM (10) in a semiconductor substrate (40) and EEPROM made according to the method includes forming a gate dielectric (38), such as oxide, nitride, multilayer dielectric, or the like, on a surface of the substrate (40) and forming a polysilicon floating gate (19) on the gate dielectric (38). A control gate (25) is formed at least partially overlying the floating gate (19), and a thermal oxide layer (56) is formed on the floating gate (19) in regions that are not covered by the control gate. Thus, the thermal oxide layer (56) encases any regions of the floating gate (19) uncovered by the control gate (25) and serves as a high quality dielectric to isolate the floating gate (19) from charge loss and other deleterious effects. Then, source and drain regions (21,27) are formed in the substrate (40).
摘要:
A semiconductor device having a p type polysilicon resistor (56) with a moderate sheet resistance and low temperature coefficient of resistance is formed by a double-level polysilicon process. The process also produces n and p-channel transistors (44, 50), a capacitor having upper and lower n type polysilicon capacitor plates (36, 26), an n type polysilicon resistor (32) having a high sheet resistance, and an n type resistor (34) having a low sheet resistance. The p type doping used to form the source/drain regions (48) of p-channel transistor (50) counterdopes n type second level polysilicon to form p type polysilicon resistor (56) without effecting capacitor plates (36, 26) or the n type resistors (32, 34).
摘要:
A method for fabricating a self-aligned DMOS transistor is provided. The method includes forming a passivation layer (18, 68) on an oxide layer (16, 66) of a substrate (12, 56). The oxide layer (16, 66) is then removed from the surface of the substrate (12, 56) where it is exposed through the passivation layer (18, 68). A reduced surface field region (36, 74) is then formed where the surface of the substrate (12, 56) is exposed through the passivation layer (18, 68). An oxide layer (38, 80) is then formed on the reduced surface field region (36, 74).
摘要:
A semiconductor device having a p type polysilicon resistor (56) with a moderate sheet resistance and low temperature coefficient of resistance is formed by a double-level polysilicon process. The process also produces n and p-channel transistors (44, 50), a capacitor having upper and lower n type polysilicon capacitor plates (36, 26), an n type polysilicon resistor (32) having a high sheet resistance, and an n type resistor (34) having a low sheet resistance. The p type doping used to form the source/drain regions (48) of p-channel transistor (50) counterdopes n type second level polysilicon to form p type polysilicon resistor (56) without effecting capacitor plates (36, 26) or the n type resistors (32, 34).
摘要:
A bipolar transistor is formed on a substrate of a first (P) conductivity type by: forming a collector region (20) of the second conductivity type (N) in the substrate; forming an adjust region (27) of the first (P) conductivity type in the collector region (20); forming a base region (36) of the first (P) conductivity type in the collector region (20), the base region (36) containing the adjust region (27); and forming an emitter region (11) of the second (N) conductivity type in the adjust region (27). The base region (36) is deeper than and more heavily doped than the adjust region (27). The adjust region (27) alters the doping profile of the base-collector junction on the collector (20) side of the junction to increase the breakdown voltage of the transistor.