摘要:
A groove (4) is formed on a semiconductor substrate (1). A mask material layer (3) is so formed on the surface of the semiconductor substrate (1) as to open a groove (4) region. With the mask material layer (3) used as a mask, a semiconductor layer (10) is selectively formed on the semiconductor substrate (1) exposed with the inner wall surface of the groove (4). Then, the mask material layer (3) is removed. An insulating film (5) is formed on the semiconductor layer (10) formed on the inner wall surface of the groove (4) and the surface of the semiconductor substrate (1). The groove (4) is buried with a conductor (6).
摘要:
Each unit cell (10) of a flash EEPROM array (50) includes a control gate (38) having a section (38b) disposed in series between a program section (34a) of a floating gate (34) and a source (18) to provide threshold voltage control for erasure. The floating gate (34) further has an erase section (34b) which extends from the program section (34a) around an end of a channel (22) to the source (18). A thin tunnel oxide layer (32) is formed between an end portion (34c) of the erase section (34b) and an underlying portion of the source (18) which enables the floating gate (34) to be erased by Fowler-Nordheim tunneling from the end portion (34c) through the oxide layer (32) to the source (18) with low applied voltages.
摘要:
An insulated gate field effect device comprising: a first conductivity type semiconductor substrate having a main surface, said semiconductor substrate having a concave with a curved surface formed on said main surface, an insulating film formed on the main surface including said concave, first and second impurity regions of a second conductivity type formed in the vicinity of said main surface of said semiconductor substrate, and at one side and the other side of said concave, respectively, said first conductivity type region of said semiconductor substrate between said first and second impurity regions having a channel region formed along said concave, and a conductive layer formed above said channel region with said insulating film interposed therebetween.
摘要:
Ions are selectively implanted into polycrystalline silicon for electrodes by utilizing low-temperature accelerated oxidation phenomenon in polycrystalline silicon having a high impurity concentration and acceleration energy dependency of impurity projection ranges of ion implantation. Therefore, there is no need of forming a mask resist pattern by photoengraving for every step of introducing impurities. Further, the base (source, drain) electrode is formed of polycrystalline silicon isolated by a selective oxidation method, the selectively oxidized film pertaining to the emitter (gate) region is removed, and a side wall spacer is formed on the inside of the emitter (gate) region, thereby making it possible to form the emitter (gate) of a reduced size.
摘要:
A dual-mode transistor structure comprises a semiconductor body. The semiconductor body of the device includes a channel region, a p-type terminal region (operable as a source or drain) adjacent a first side of the channel region and an n-type terminal region (operable as a source or drain) adjacent a second side of the channel region. A gate insulator is disposed on a surface of the semiconductor body over the channel region. A gate is disposed on the gate insulator over the channel region. A first assist gate is disposed on a first side of the gate, and a second assist gate is disposed on a second side of the gate. Optionally, a back gate can be included beneath the channel region. Biasing the assist gates can be used to select n-channel or p-channel modes in a single device.
摘要:
The invention relates to a process for fabricating a field-effect transistor device (20) implemented on a network of vertical nanowires (24), comprising the following steps: producing a source electrode (26) and a drain electrode (30) at each end of each nanowire (24) symmetrically relative to the gate electrode of each elementary transistor implemented on a nanowire; creating a gate electrode by depositing a layer (38) of conductive material around a layer (36) of dielectric material that surrounds a portion of each nanowire (24), a single conductive layer (38) being used for all the nanowires and the thickness of the conductive layer corresponding to the gate length of the transistor device; and insulating each electrode with a planar layer (32, 34) of a dielectric material in order to form a nanoscale gate and in order to insulate the contacts of each elementary transistor between the gate and the source and the gate and the drain.
摘要:
A power semiconductor device is disclosed with layers of different conductivity types between an emitter electrode on an emitter side and a collector electrode on a collector side. The device can include a drift layer, a first base layer in direct electrical contact to the emitter electrode, a first source region embedded into the first base layer which contacts the emitter electrode and has a higher doping concentration than the drift layer, a first gate electrode in a same plane and lateral to the first base layer, a second base layer in the same plane and lateral to the first base layer, a second gate electrode on top of the emitter side, and a second source region electrically insulated from the second base layer, the second source region and the drift layer by a second insulating layer.
摘要:
A method of fabricating a high-voltage transistor (80) on a substrate (81,100), the method comprising: forming a plurality of parallel arranged drift regions (82) comprising a doped semiconductor layer of a first conductivity type interleaved with an insulating layer (88,102) surrounding a conducting layer, the conducting layers each comprising a field plate member (84,103); forming source (87,105) and body regions (86,107), the body regions separating the source regions from the drift regions; and forming insulated gates (90) adjacent the body regions, the insulated gates defining channels in the body regions between the source regions and the drift regions.