Fairchild Semiconductor Corporation

Qi Wang

Minhua Li

Hamza Yilmaz

James N Pan

James J Murphy

Joelle Sharp

Gordon Sim

Steven Paul Sapp

Yong Liu

Suku Kim

Hui Chen

Matthew Reynolds

Yuri V Sokolov

Tat Ngai

Ming-Huang Huang

John Robert Diroll

Chung-Lin Wu

Gary M Dolny

Chanho Park

Jeffrey H Rice

Hossein Paravi

Briant Harward

Amber Crellin-Ngo

A method for forming a semiconductor structure includes the following steps. Trenches are formed in a semiconductor region using a masking layer such that the trenches have a first depth, a first width along their bottom, and sidewalls having a first slope. The masking layer is removed, and a bevel etch is performed to taper the sidewalls of the trenches so that the sidewalls have a second slope less than the first slope.

Technique for controlling trench profile in semiconductor structures

A three-dimensional semiconductor device includes a first semiconductor device, a second semiconductor device, and a patterned conductive layer disposed between the first and the second semiconductor devices. The first semiconductor device has a first plurality of terminals on a front side of the first semiconductor device and a first metal substrate on its back side, wherein one of the first plurality of terminals in the first semiconductor device is electrically coupled to the first metal substrate. The second semiconductor device has a second plurality of terminals on a front side of the second semiconductor device and a second metal substrate on its back side, wherein the second semiconductor device further includes a second metal substrate on its back side. The patterned conductive layer includes a plurality of conductive regions. Each of the conductive regions is bonded to a conductor coupled to one of the first plurality of terminals and another conductor coupled to one of the second plurality of terminals.

Three-dimensional semiconductor device structures and methods

A method for obtaining individual dies from a semiconductor structure is disclosed. The semiconductor structure includes a device layer, and the device layer in turn includes active regions separated by predefined spacings. Thick metal is selectively formed on backside of the device layer such that thick metal is formed on backside of active regions but not on backside of the predefined spacings. The semiconductor structure is then cut along the predefined spacings to separate the active regions with thick metal on their backside into individual dies.

Method and structure for dividing a substrate into individual devices

A vertical semiconductor device includes a bottom metal layer and a first P-type semiconductor layer overlying the bottom metal layer. The first P-type semiconductor layer is characterized by a surface crystal orientation of (110) and a first conductivity. The first P-type semiconductor layer is heavily doped. The vertical semiconductor device also includes a second P-type semiconductor layer overlying the first P-type semiconductor layer. The second semiconductor layer has a surface crystal orientation of (110) and is characterized by a lower conductivity than the first conductivity. The vertical semiconductor device also has a top metal layer overlying the second P-type semiconductor layer. A current conduction from the top metal layer to the bottom metal layer and through the second p-type semiconductor layer is characterized by a hole mobility along a &#x3c;110&#x3e; crystalline orientation and on (110) crystalline plane.

Semiconductor device with (110)-oriented silicon

A semiconductor die package is disclosed. The semiconductor die package comprises a metal substrate, and a semiconductor die comprising a first surface comprising a first electrical terminal, a second surface including a second electrical terminal, and at least one aperture. The metal substrate is attached to the second surface. A plurality of conductive structures is on the semiconductor die, and includes at least one conductive structure disposed in the at least one aperture. Other conductive structures may be disposed on the first surface of the semiconductor die.

Semiconductor die packages using thin dies and metal substrates

A vertically-conducting planar-gate field effect transistor includes a silicon region of a first conductivity type, a silicon-germanium layer extending over the silicon region, a gate electrode laterally extending over but being insulated from the silicon-germanium layer, a body region of the second conductivity type extending in the silicon-germanium layer and the silicon region, and source region of the first conductivity type extending in the silicon-germanium layer. The gate electrode laterally overlaps both the source and body regions such that a portion of the silicon germanium layer extending directly under the gate electrode between the source region and an outer boundary of the body region forms a channel region.

Structure and method for forming planar gate field effect transistor with low resistance channel region

A field effect transistor device having a strained semiconductor channel region overlying a heterostructure-semiconductor on a metal substrate includes a first semiconductor layer overlying a first metal layer. The first semiconductor layer has a first semiconductor material and a second semiconductor material in a relaxed heterostructure and is heavily doped. A second semiconductor layer overlies the first semiconductor layer and has a first semiconductor material and a second semiconductor material in a relaxed heterostructure. The second semiconductor layer is more lightly doped than the first semiconductor layer. A trench extends into the second semiconductor layer and a channel region has a strained layer of the first semiconductor material adjacent a trench sidewall. The strained channel region provides enhanced carrier mobility and improves performance of the field effect transistor.

Power MOSFET having a strained channel in a semiconductor heterostructure on metal substrate

A buck converter module includes a high side (HS) die having source, drain, and gate bonding pads on a front side of the HS die, a low side (LS) die having a first section thereof with a plurality of through silicon vias (TSVs) extending from a back side to a front side of the LS die, the LS die having source, drain, and gate bonding pads located on a front side of a second section separate from the first section, the drain bonding pad electrically connected to the back side of the LS die in the second section. The HS die and the LS die are bonded together such that the source bonding pad of the HS die is electrically connected to the back side of the LS die, and each of the drain and gate bonding pads are electrically connected to separate TSVs in the LS die.

Wafer level buck converter

A method of forming a semiconductor device on a heavily doped P-type (110) semiconductor layer over a metal substrate includes providing a first support substrate and forming a P-type heavily doped (110) silicon layer overlying the first support substrate. At least a top layer of the first support substrate is removable by a selective etching process with respect to the P-type heavily doped (110) silicon layer. A vertical semiconductor device structure is formed in and over the (110) silicon layer. The vertical device structure includes a top metal layer and is characterized by a current conduction in a &#x3c;110&#x3e; direction. The method includes bonding a second support substrate to the top metal layer and removing the first support substrate using a mechanical grinding and a selective etching process to expose a surface of the P-type heavily doped (110) silicon layer and to allow a metal layer to be formed on the surface.

A three-dimensional semiconductor device structure includes a first semiconductor device and a second semiconductor device bonded together using a patterned conductive layer according to an embodiment of the invention. The first semiconductor device includes a first plurality of terminals on its front side, and the second semiconductor device includes a second plurality of terminals on its front side. The patterned conductive layer includes a plurality of conductive regions. Each of the conductive regions is bonded to a conductor coupled to one of the first plurality of terminals and bonded to another conductor coupled to one of the second plurality of terminals, providing electrical coupling between the first semiconductor device and the second semiconductor device. In a specific embodiment, each terminal of the first semiconductor device is bonded to a corresponding terminal of the second semiconductor device, providing a parallel combination of the first and the second semiconductor devices.

A method of forming a field effect transistor having a heavily doped p-type (110) semiconductor layer over a metal substrate starts with providing a heavily doped p-type (110) silicon layer, and forming a lightly doped p-type (110) silicon layer on the P heavily doped-type (110) silicon layer. The method also includes forming a p-channel MOSFET which has a channel region along a (110) crystalline plane in the lightly doped p-type (110) silicon layer to allow a current conduction in a &#x3c;110&#x3e; direction. The p-channel MOSFET also includes a gate dielectric layer having a high dielectric constant material lining the (110) crystalline plane. The method further includes forming a top conductor layer overlying the lightly doped p-type (110) silicon layer and a bottom conductor layer underlying the heavily doped p-type (110) silicon layer. A current conduction from the top conductor layer to the bottom conductor layer is characterized by a hole mobility along a &#x3c;110&#x3e; crystalline orientation and on a (110) crystalline plane.

(110)-oriented p-channel trench MOSFET having high-K gate dielectric

A first and a second substrate are bonded together to thereby form a unitary hybrid substrate. Predefined portions of the first substrate are removed to form openings in the first substrate through which surface regions of the second substrate are exposed. A selective epitaxial growth process that is selective with respect to the crystalline orientations of the first and second substrates is carried out to thereby form epitaxial silicon from the exposed surfaces of the second substrate but not from exposed surfaces of the first substrate. The epitaxial silicon formed from the exposed surfaces of the second substrate has the same crystalline orientation as the second substrate.

Structure and method for forming hybrid substrate

A trench-gate field effect transistor includes trenches extending into a silicon region of a first conductivity type, and a gate electrodes in each trench. Body regions of second conductivity type extend over the silicon region between adjacent trenches. Each body region forms a PN junction with the silicon region. A gate dielectric layer lines at least upper sidewalls of each trench, and insulates the gate electrode from the body region. Source regions of the first conductivity flank the trenches. A silicon-germanium region vertically extends through each source region and through a corresponding body region, and terminates within the corresponding body region before reaching the PN junction.

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Sandy, UT, United States of America

Qi Wang