摘要:
An LDMOS transistor (100) on a substrate (70a, 70b) of a first conductivity type, comprises a source region (10) with a source portion (73) and a drain region (12). The source portion and drain region are of a second conductivity type opposite to the first conductivity type and are mutually connected through a channel region (28) in the substrate over which a gate electrode (14) extends. The drain region comprises a drain contact region (16) and a drain extension region (15) which extends from the channel region (28) towards the drain contact region. The drain contact region is electrically connected to a top metal layer (22) by a drain contact (20), and a poly-Si drain contact layer (80) is arranged as a first contact material in between the drain contact region and the drain contact in a contact opening (51) of a first dielectric layer (52) deposited on the surface of the drain region. The poly-Si drain contact layer comprises a dopant element of the second conductivity type which is diffused therefrom through annealing to form said drain contact region.
摘要:
Junction field effect transistors (JFET) formed in substrates containing germanium. JFETs having polycrystalline semiconductor surface contacts (562, 530, 560, 532) with self-aligned suicide (580) formed thereon and self-aligned source, drain and gate regions (520, 522,540) formed by thermal drive-in of impurities from surface contacts into the substrate, and implanted link regions (522, 526). Others have a polycrystalline semiconductor gate surface contact and metal back gate, source and drain contacts and a metal surface contact to the gate surface contact with implanted source and drains and a self -aligned gate region. JFETs having a polycrystalline semiconductor gate surface contact and metal back gate, source and drain contacts and a metal surface contact to the- gate surface contact with implanted source and drains and a self-aligned gate region and suicide formed on the top of the source, drain and back gate contacts and on top of the gate polycrystalline semiconductor gate contact to which the metal surface contacts make electrical contact.
摘要:
A method is provided for forming a power semiconductor device. The method begins by providing a substrate of a first or second conductivity type and then forming a voltage sustaining region on the substrate. The voltage sustaining region is formed by depositing an epitaxial layer of a first conductivity type on the substrate and forming at least one trench in the epitaxial layer. A first layer of polysilicon having a second dopant of the second conductivity type is deposited in the trench. The second dopant is diffused to form a doped epitaxial region adjacent to the trench and in the epitaxial layer. A second layer of polysilicon having a first dopant of the first conductivity type is subsequently deposited in the trench. The first and second dopants respectively located in the second and first layers of polysilicon are interdiffused to achieve electrical compensation in the first and second layers of polysilicon. Finally, at least one region of the second conductivity type is formed over the voltage sustaining region to define a junction therebetween.
摘要:
Trisilane is used in chemical vapor deposition methods to deposit silicon-containing films over mixed substrates. Such methods are useful in semiconductor manufacturing to provide a variety of advantages, including uniform deposition over heterogeneous surfaces, high deposition rates, and higher manufacturing productivity. An example is in forming the base region of a heterojunction bipolar transistor, including simultaneous deposition over both single crystal semiconductor surfaces and amorphous insulating regions.
摘要:
The invention relates to a method for producing an integrated component which has several electrode connections (21,22, 23, 26) which protrude in relation to the main surface thereof (11) on a semiconductor substrate (1). The electrode connections (21,22, 23, 26) are formed by removing the electrode connection layer (2) and/or the insulation covering layer (3a) to areas (3a1,3a2) which are adjacent to the electrode connections (21,22, 23, 26). The invention also relates to a method for producing electric connections (24, 25, 101 -106) between individual circuit elements (21, 22, 23, 26, LDD1, LDD2, HDD1 -HDD3) formed in or on a semiconductor substrate (1). The channels of the strip conductors incorporated into the planarized surface (111,112) are composed of circuit elements (LLD1, LDD2, HDD1 - HDD3, 21, 22, 23, 26) and filling material (70 - 75) and are filled with a good conductive material (10, 101 - 106) . The invention also relates to a semiconductor component provided with several protruding electrode connections.
摘要:
In the manufacture of a semiconductor power device such as a trench-gate power MOSFET, a source region (13) is formed using a sidewall extension (30) of an upstanding insulated-gate structure (11, 21, 22). The sidewall extension (30) forms a step with an adjacent surface area (10a') of a body region (15) of a first conductivity type and comprises doped semiconductor material (13a) of opposite, second conductivity type which is separated from the gate (11) by insulating material (22). The body region (15) provides a channel-accommodating portion (15a) adjacent to the gate structure (11, 21, 22) and also comprises a localised high-doped portion (15b) which extends to a greater depth in the semiconductor body (10) than the shallow p-n junction between the source region (13) and the channel-accommodating portion (15a), and preferably deeper even than the bottom of the trench (20) of a trench-gate device. This high-doped portion (15b) is formed by introducing dopant of the first conductivity type into the semiconductor body (10) via the stepped-down adjacent surface area (10a') while using the stepped-up sidewall extension (30) comprising the doped source region material (13a) to mask the underlying channel area. Source electrode material (33) is deposited over the step so as to contact the doped semiconductor material (13a) of the sidewall extension (30) and the adjacent surface area (10a') of the high-doped portion (15b).
摘要:
A trench version of a high-capacitance (Hi-C) capacitor for a dynamic random-access-memory (DRAM) cell is made utilizing a doping technique. A shallow highly doped trench region is thereby formed. At the same time, selected lateral surface portions (24) of the structure are also thereby highly doped. These surface portions permit a direct electrical connection to be easily made between the capacitor and a subsequently formed adjacent access transistor.
摘要:
In semiconductor devices of extremely small dimensions, the problem of shorting together of adjacent, differently doped regions (12, 14) by a contact layer deposited through a window (17) which, owing to the smallness of the region dimensions, unavoidably exposes a surface portion of the adjacent region (12) not intended to be contacted, is solved by the use of a transfer layer (18) deposited first in the window which, upon heating, transfers impurities from the region (14) intended to be contacted to the unintentionally exposed portion of the adjacent region (12). The transferred impurities convert the exposed portion of the adjacent region to the same conductivity type as the impurity source region (14), thereby preventing shorting together of the contacted region (14) with the remaining, unconverted portion of the adjacent region.