The present disclosure provides a semiconductor structure, including: a semiconductor device layer including a first surface and a second surface, wherein the first surface is at a front side of the semiconductor device layer, and the second surface is at a backside of the semiconductor device layer; an insulating layer above the second surface of the semiconductor device; and a through-silicon via (TSV) traversing the insulating layer. Associated manufacturing methods of the same are also provided.

A technique includes: (a) forming a second film, whose etching rate is a second etching rate that is equal to or lower than a first etching rate of a first film when a first gas capable of removing at least a portion of the first film is supplied, on the first film; and (b) supplying the first gas to the first film.

A method includes forming a trench in a semiconductor layer of a device wafer and depositing a liner on the trench sidewalls. The liner is removed from the trench bottom, and the trench is deepened anisotropically to form an extension fully along the trench, or locally by applying a mask. The semiconductor material is removed outwardly from the extension by etching to create a cavity wider than the trench and below the liner. A space formed by the trench and cavity is filled with electrically conductive material to form a buried interconnect rail comprising a narrow portion in the trench and a wider portion in the cavity. The wider portion can be contacted by a TSV connection, enabling a contact area between the connection and buried rail. The etching forms a wider rail portion at a location remote from active devices formed on the front surface of the semiconductor layer.

Approaches herein provide devices and methods for forming optimized gate-all-around transistors. One method may include forming a plurality of nanosheets each comprising a plurality of alternating first layers and second layers, and etching the plurality of nanosheets to laterally recess the second layers relative to the first layers. The method may further include forming an inner spacer over the recessed second layers by forming a spacer material along an exposed portion of each of the plurality of nanosheets, etching the spacer material to remove the spacer material from the first layers of each of the plurality of nanosheets, and performing a sidewall treatment to the plurality of nanosheets after the spacer material is removed from the first layers of each of the plurality of nanosheets.

Embodiments disclosed herein include transistor devices with depopulated channels. In an embodiment, the transistor device comprises a source region, a drain region, and a vertical stack of semiconductor channels between the source region and the drain region. In an embodiment, the vertical stack of semiconductor channels comprises first semiconductor channels, and a second semiconductor channel over the first semiconductor channels. In an embodiment, first concentrations of a dopant in the first semiconductor channels are less than a second concentration of the dopant in the second semiconductor channel.

A method for etching a thin film includes conducting electron-enhanced chemical vapor etching with at least one reactive background gas and electrons to etch a thin film on a substrate with a positive substrate voltage. In an embodiment, the method is a method for etching a silicon thin film, including conducting electron-enhanced chemical vapor etching with at least one reactive background gas and electrons to etch a silicon thin film on a substrate with a positive substrate voltage.

Semiconductor devices having necked semiconductor bodies and methods of forming semiconductor bodies of varying width are described. For example, a semiconductor device includes a semiconductor body disposed above a substrate. A gate electrode stack is disposed over a portion of the semiconductor body to define a channel region in the semiconductor body under the gate electrode stack. Source and drain regions are defined in the semiconductor body on either side of the gate electrode stack. Sidewall spacers are disposed adjacent to the gate electrode stack and over only a portion of the source and drain regions. The portion of the source and drain regions under the sidewall spacers has a height and a width greater than a height and a width of the channel region of the semiconductor body.

Various technologies are described herein pertaining to electrochemical etching of a semiconductor controlled by way of a laser that emits light with an energy below a bandgap energy of the semiconductor.

A method includes bonding an integrated circuit die to a carrier substrate, forming a gap-filling dielectric around the integrated circuit die and along the edge of the carrier substrate, performing a bevel clean process to remove portions of the gap-filling dielectric from the edge of the carrier substrate, after performing the bevel clean process, depositing a first bonding layer on the gap-filling dielectric and the integrated circuit die, forming a first dielectric layer on an outer sidewall of the first bonding layer, an outer sidewall of the gap-filling dielectric, and the first outer sidewall of the carrier substrate; and bonding a wafer to the first dielectric layer and the first bonding layer, wherein the wafer comprises a semiconductor substrate and a second dielectric layer on an outer sidewall of the semiconductor substrate.

The disclosure relates to a type trench gate silicon carbide MOSFET device and a fabrication method thereof. To protect a trench gate oxide layer without increasing a channel resistance and process complexity, a second conductivity type of heavily doped deep well inserted with double gate trenches along the sidewalls of deep well is designed. The deep well is connected to the source metal directly. The electric potential is clamped to the source during the voltage blocking and turn-off state, which reduces the electric field in the gate oxide and reduces the miller capacitance. An interlayer dielectric layer is deposited above the conductive dielectric polysilicon layers and extends outward separately to cover a part of the source region. A smaller cell pitch can be achieved by controlling the spacing between the first and the second trench gate, thereby increasing the channel density and reducing the channel resistance.