摘要:
Disclosed is an integrated circuit (100) comprising a substrate (110) carrying a plurality of light-sensitive elements (112) and a blazed grating (120) comprising a plurality of diffractive elements (122) for diffracting respective spectral components (123-125) of incident light (150) to respective light-sensitive elements (112), the blazed grating (120) comprising a stack of layers, at least some of these layers comprising first portions, e.g. metal portions (202, 222, 242) arranged such that each diffractive element (122) comprises a stepped profile of stacked first portions with a first portion in a higher layer laterally extending beyond a first portion in a lower layer of said stepped profile.
摘要:
Disclosed is an integrated circuit (100) comprising a substrate (110) carrying a plurality of light-sensitive elements (112) and a blazed grating (120) comprising a plurality of diffractive elements (122) for diffracting respective spectral components (123-125) of incident light (150) to respective light-sensitive elements (112), the blazed grating (120) comprising a stack of layers, at least some of these layers comprising first portions, e.g. metal portions (202, 222, 242) arranged such that each diffractive element (122) comprises a stepped profile of stacked first portions with a first portion in a higher layer laterally extending beyond a first portion in a lower layer of said stepped profile.
摘要:
A semiconductor device (10) comprising a bipolar transistor and a field 5 effect transistor within a semiconductor body (1) comprising a projecting mesa (5) within which are at least a portion of a collector region (22c and 22d) and a base region (33c) of the bipolar transistor. The bipolar transistor is provided with an insulating cavity (92b) provided in the collector region (22c and 22d). The insulating cavity (92b) may be provided by providing a layer (33a) in the collector region (22c), creating an access path, for example by selectively etching polysilicon towards monocrystalline, and removing a portion of the layer (33a) to provide the cavity using the access path. The layer (33a) provided in the collector region may be of SiGe:C. By blocking diffusion from the base region the insulating cavity (92b) provides a reduction in the base collector capacitance and can be described as defining the base contact.
摘要:
A method of manufacturing a bipolar transistor is compatible with FinFET processing. A collector region (18) is formed and patterned, base contact regions (26) formed on either side, and a gap formed between the base contact region. A base (28), spacers (30) and an emitter (32) are formed in the gap.
摘要:
The invention relates to a method of manufacturing a semiconductor device comprising a field effect transistor, in which method a semiconductor body of silicon with a substrate is provided at a surface thereof with a source region and a drain region of a first conductivity type which are situated above a buried isolation region and with a channel region, between the source and drain regions, of a second conductivity type, opposite to the first conductivity type, and with a gate region separated from the surface of the semiconductor body by a gate dielectric and situated above the channel region, wherein a mesa is formed in the semiconductor body in which the channel region is formed and wherein the source and drain regions are formed on both sides of the mesa in a semiconductor region that is formed using epitaxial growth, the source and drain regions thereby contacting the channel region.
摘要:
The invention relates to a method of manufacturing a semiconductor device (10) with a substrate (11) and a semiconductor body (12) which is provided with at least one bipolar transistor having an emitter region (1), a base region (2) and a collector region (3), wherein in the semiconductor body (12) a first semiconductor region (13) is formed that forms one (3) of the collector and emitter regions (1,3) and on the surface of the semiconductor body (12) a stack of layers is formed comprising a first insulating layer (4), a polycrystalline semiconductor layer (5) and a second insulating layer (6) in which stack an opening (7) is formed, after which by non-selective epitaxial growth a further semiconductor layer (22) is deposited of which a monocrystalline horizontal part on the bottom of the opening (7) forms the base region (2) and of which a polycrystalline vertical part (2A) on a side face of the opening (7) is connected to the polycrystalline semiconductor layer (5), after which spacers (S) are formed parallel to the side face of the opening (7) and a second semiconductor region (31) is formed between said spacers (S) forming the other one (1) of the emitter and collector regions (1,3). According to the invention the above method is characterized in that before the further semiconductor layer (22) is deposited, the second insulating layer (6) is provided with an end portion (6A) that viewed in projection overhangs an end portion (5A) of the underlying semiconductor layer (5). In this way bipolar transistor devices can be obtained with good high frequency properties in a cost effective manner.
摘要:
The invention relates to a method of manufacturing a semiconductor device (10) comprising a substrate (12) and a silicon semiconductor body (11) and comprising a bipolar transistor with an emitter region (1) of a first conductivity type, a base region (2) of a second conductivity type opposite to the first conductivity type, and a collector region (3) of the first conductivity type, on the surface of the semiconductor body (11) in which the collector region (3) is formed at least an epitaxial semiconductor layer (20,21,22) being deposited in which the base region (2) is formed, on top of this an etch stop layer (15) being deposited on which a silicon low-crystalline semiconductor layer (24) is deposited in which a connection zone of the base region (2) is formed and in which at the location of an emitter region (1) to be formed an opening (7) is provided running up to the etch stop layer (15), a portion of the etch stop layer (15) covering the opening (7) being removed by means of etching and also an adjoining portion of the etch stop layer (15), a hollow being created underneath the silicon low-crystalline semiconductor layer (24) adjoining and connected the opening (7), whereinafter a high-crystalline semiconductor layer (5) is formed within the hollow. In a method according to the invention the formation of the high-crystalline semiconductor layer (5) is carried out in such a way that a part of the surface of the semiconductor body (11) adjoining the opening (7) is kept free from the high-crystalline semiconductor layer (5). In this way a high-quality device (10) is obtained in easy manner. The relevant surface is kept free using a cover layer (6) or in a preferred manner even without the use of such a layer.
摘要:
A vertical semiconductor device, for example a trench-gate MOSFET power transistor (1), has a drift region (12) of one conductivity type containing spaced vertical columns (30) of the opposite conductivity type for charge compensation increase of the device breakdown voltage. Insulating material (31) is provided on the sidewalls only of trenches (20) in the drift region (12) and the opposite conductivity type material is epitaxially grown from the bottom of the trenches (20). The presence of the sidewall insulating material (31) reduces the possibility of defects during the epitaxial growth and hence excessive leakage currents in the device (1). The insulating material (31) also prevents epitaxial growth on the trench sidewalls and hence substantially prevents forming voids in the trenches which would lessen the accuracy of charge compensation. The epitaxial growth by this method can be well controlled and may be stopped at an upper level (21) below the top major surface (10a). Thus, for example, trench-gates 22, 23 may be formed in the same trenches (20) above the compensation columns (30).
摘要:
The invention relates to a trench MOSFET with drain (8), drift (10) body (12) and source (14) regions. The drift region is doped to have a high concentration gradient. A field plate electrode (34) is provided adjacent to the drift region (10) and a gate electrode (32) next to the body region (12).
摘要:
A method of manufacturing a trench-gate semiconductor device (1), the method including forming trenches (20) in a semiconductor body (10) in an active transistor cell area of the device, the trenches (20) each having a trench bottom and trench sidewalls, and providing silicon oxide gate insulation (21) in the trenches such that the gate insulation (33) at the trench bottoms is thicker than the gate insulation (21) at the trench sidewalls in order to reduce the gate-drain capacitance of the device. The method includes, after forming the trenches (20), the steps of: (a) forming a silicon oxide layer (21) at the trench bottoms and trench sidewalls; (b) depositing a layer of doped polysilicon (31) adjacent the trench bottoms and trench side walls; (c) forming silicon nitride spacers (32) on the doped polysilicon (21) adjacent the trench sidewalls leaving the doped polysilicon exposed at the trench bottoms; (d) thermally oxidising the exposed doped polysilicon to grow said thicker gate insulation (33) at the trench bottoms; (e) removing the silicon nitride spacers (32); and (f) depositing gate conductive material (34) within the trenches to form a gate electrode for the device. The final thickness of the thicker gate insulation (33) at the trench bottoms is well controlled by the thickness of the layer of doped polysilicon (31) deposited in step (b). Also the doped (preferably greater than 5 e 19 cm-3) polysilicon oxidises fast at low temperatures (preferably 700-800° C.), reducing the risk of diffusing (e.g. p body) implantations present in the device at that stage.