Abstract:
A semiconductor device includes a body (1) and, in the body (1): a semiconductor substrate (2), a semiconductor structural layer (10) and a dielectric layer (12) therebetween. A through interconnection via (30) traverses the body (1) and extends through the dielectric layer (12). The through interconnection via (30) has: a front-side interconnection region (17), including a portion of the structural layer (10) that extends between the dielectric layer (12) and a front face (10a) of the body (1) and is laterally insulated from the remainder of the structural layer (10); a back-side interconnection region (27), including a portion of the substrate (2) that extends between the dielectric layer (12) and a back face (2a) of the body (1) and is laterally insulated from the remainder of the substrate (2) by a back-side insulation trench (29). The back-side insulation trench (29) extends across the entire substrate (2; 102; 202), from the back face (2a) of the body (1) to the dielectric layer (12) the; and a conductive continuity region (8) connecting the front-side interconnection region (17) and the back-side interconnection region (27) through the dielectric layer (12).
Abstract:
A process for manufacturing a through via in a semiconductor device includes the steps of: forming a body (1) comprising a structural layer (10), a substrate (2), and a dielectric layer (12) set between the structural layer (10) and the substrate (2); insulating a portion of the structural layer (10) to form a front-side interconnection region (17); insulating a portion of the substrate (2) to form a back-side interconnection region (27); and connecting the front-side interconnection region (17) and the back-side interconnection region (27) through the dielectric layer (12).
Abstract:
A process for bonding two distinct substrates that integrate microsystems, comprising the steps of: making micro-integrated devices in at least one of the two substrates using microelectronic processing techniques; and bonding said substrates. The bonding is performed by making on a first substrate (33) bonding regions (32) of deformable material and by pressing said substrates one against another so as to deform the bonding regions and to cause them to react chemically with the second substrate (34). The bonding regions are preferably formed by a thick layer (30) made of a material chosen from among aluminium, copper and nickel, covered by a thin layer (31) made of a material chosen from between palladium and platinum. Spacing regions (25') guarantee exact spacing between the two wafers.
Abstract:
A semiconductor device includes a body (1) and, in the body (1): a semiconductor substrate (2), a semiconductor structural layer (10) and a dielectric layer (12) therebetween. A through interconnection via (30) traverses the body (1) and extends through the dielectric layer (12). The through interconnection via (30) has: a front-side interconnection region (17), including a portion of the structural layer (10) that extends between the dielectric layer (12) and a front face (10a) of the body (1) and is laterally insulated from the remainder of the structural layer (10); a back-side interconnection region (27), including a portion of the substrate (2) that extends between the dielectric layer (12) and a back face (2a) of the body (1) and is laterally insulated from the remainder of the substrate (2) by a back-side insulation trench (29). The back-side insulation trench (29) extends across the entire substrate (2; 102; 202), from the back face (2a) of the body (1) to the dielectric layer (12) the; and a conductive continuity region (8) connecting the front-side interconnection region (17) and the back-side interconnection region (27) through the dielectric layer (12).
Abstract:
The semiconductor inertial sensor (30) is formed by a rotor element (38) and a stator element (39) electrostatically coupled together. The rotor element (38) is formed by a suspended mass (40) and by a plurality of mobile electrodes (41) extending from the suspended mass (40). The stator element (39) is formed by a plurality of fixed electrodes (42) facing respective mobile electrodes (41). The suspended mass (40) is supported by elastic suspension elements (45). The suspended mass (40) has a first, larger, thickness (t1 + t2), and the elastic suspension elements (45) have a second thickness (t1), smaller than the first thickness.
Abstract:
Micro-electro-mechanical structure formed by a substrate (41) of semiconductor material and a suspended mass (10, 20) extending above the substrate (41) and separated therefrom by an air gap (55). An insulating region (23, 24) of a first electrically insulating material extends through the suspended mass (10, 20) and divides it into at least one first electrically insulated suspended region and one second electrically insulated suspended region (10a, 10b, 20a, 20b). A plug element (46) of a second electrically insulating material different from the first electrically insulating material is formed underneath the insulating region (23, 24) and constitutes a barrier between the insulating region and the air gap (55) for preventing removal of the insulating region during fabrication, when an etching agent is used for removing a sacrificial layer and forming the air gap.
Abstract:
A read/write assembly for magnetic hard disks includes at least: one supporting element (5, 8); one read/write (R/W) transducer (6); one micro-actuator (10), set between the R/W transducer (6) and the supporting element (5, 8); one electrical-connection structure (11) for connection to a remote device carried by the supporting element (5,8) and connected to the R/W transducer (6) and to the micro-actuator (10) In addition, a protective structure (15), set so as to cover the micro-actuator (10) is made of a single piece with the electrical-connection structure (11).