摘要:
Method of manufacturing a semiconductor device comprising MOS transistors having gate electrodes (15, 16) formed in a number of metal layers (8, 9, 13; 8, 12, 13) deposited upon one another. In this method, active silicon regions (4, 5) provided with a layer of a gate dielectric (7) and field-isolation regions (6) insulating these regions with respect to each other are formed in a silicon body (1). Then, a layer off a first metal (8) is deposited in which locally, at the location of a part of the active regions (4), nitrogen is introduced. On the layer of the first metal, a layer of a second metal (13) is then deposited, after which the gate electrodes are etched in the metal layers. Before nitrogen is introduced into the first metal layer, an auxiliary layer of a third metal (9) which is permeable to nitrogen is deposited on the first metal layer. Thus, the first metal layer can be nitrided locally without the risk of damaging the underlying gate dielectric. Substantial changes of the metal work function are possible, and a semiconductor device comprising NMOS and PMOS can be realized.
摘要:
A method is described for forming gate structures with different metals on a single substrate. A thin semiconductor layer (26) is formed over gate dielectric (24) and patterned to be present in a first region (16) not a second region (18). Then, metal (30) is deposited and patterned to be present in the second region not the first. Then, a fully suicided gate process is carried out to result in a fully suicided gate structure in the first region and a gate structure in the second region including the fully suicided gate structure above the deposited metal (30).
摘要:
A semiconductor device, fabricated by a method, having a semiconductor structure with a silicon region which forms at least one connection region in and/or on a surface of a substrate is disclosed. In one embodiment, the method includes i) forming, at least at the silicon region, a metal cluster layer from a first metal, such that, in the metal cluster layer, metal clusters alternate with sites where there are no metal clusters, the first metal being a non-siliciding metal at predetermined conditions, ii) depositing a metal layer of a second metal on top of the metal cluster layer, the second metal being a siliciding metal and iii) carrying out at least one heat treatment at the predetermined conditions on the second metal layer so as to form metal silicide through reaction of the second metal with the silicon region, wherein atoms of the first metal are displaced in a direction substantially perpendicular to the surface of the substrate.
摘要:
One embodiment of the invention relates to a method for fabricating a semiconductor device having a semiconductor structure with a silicon region which forms at least one connection region in and/or on a surface of a substrate. The method comprises forming a metal cluster layer from a first, non-siliciding metal, followed by the deposition of a metal layer consisting of a second, siliciding metal. A subsequent heat treatment is responsible for forming a metal silicide from the second metal, the atoms of the first metal being displaced in a direction substantially perpendicular to the surface of the substrate. According to one embodiment of the invention, the atoms of the first metal are displaced by the Kirkendall effect to beneath the metal silicide. If an MOST, for example, is being fabricated, this has advantages both at the location of the source and drain region and at the location of the gate electrode.
摘要:
A method for providing 11C-labeled cyanides from 11C labeled oxides in a target gas stream retrieved from an irradiated high pressure gaseous target containing O2 is provided, wherein 11C labeled oxides are reduced with H2 in the presence of a nickel catalyst under a pressure and a temperature sufficient to form a product stream comprising at least about 95% 11CH4 , the 11CH4 is then combined with an excess of NH3 in a carrier/reaction stream flowing at an accelerated velocity and the combined 11CH4 carrier/reaction stream is then contacted with a platinum (Pt) catalyst particulate supported on a substantially-chemically-nonreactive heat-stable support at a temperature of at least about 900 ° C., whereby a product stream comprising at least about 60%H11CN is provided in less than 10 minutes from retrieval of the 11C labeled oxide.
摘要:
The invention relates to a method for fabricating a semiconductor device having a semiconductor body that comprises a first semiconductor structure having a dielectric layer and a first conductor, and a second semiconductor structure having a dielectric layer and a second conductor, that part of the first conductor which adjoins the dielectric layer having a work function different from the work function of the corresponding part of the second conductor. In one embodiment of the invention, after the dielectric layer has been applied to the semiconductor body, a metal layer is applied to the said dielectric layer, and then a silicon layer is deposited on the metal layer and is brought into reaction with the metal layer at the location of the first semiconductor structure, forming a metal silicide. In one embodiment, those parts of the conductors which have different work functions are formed by etching a layer other than the silicon layer, in particular a metal layer, at the location of one of the two semiconductor structures. Furthermore, a further metal layer is applied over the silicon layer and is used to form a further metal silicide at the location of the second transistor. One embodiment of the invention is particularly suitable for use in CMOS technology and results in both PMOS and NMOS transistors with favourable properties.
摘要:
A method for providing 11C-labeled cyanides from 11C labeled oxides in a target gas stream retrieved from an irradiated high pressure gaseous target containing O2, wherein 11C labeled oxides are reduced with H2 in the presence of a nickel catalyst under a pressure and a temperature sufficient to form a product stream comprising at least about 95% 11CH4, the 11CH4 is then combined with an excess of NH3 in a carrier/reaction stream flowing at an accelerated velocity and the combined 11CH4 carrier/reaction stream is then contacted with a platinum (Pt) catalyst particulate supported on a substantially-chemically-nonreactive heat-stable support at a temperature of at least about 900° C., whereby a product stream comprising at least about 60% H11CN is provided in less than 10 minutes from retrieval of the 11C labeled oxide.
摘要:
The invention relates to a method for fabricating a semiconductor device having a semiconductor body that comprises a first semiconductor structure having a dielectric layer and a first conductor, and a second semiconductor structure having a dielectric layer and a second conductor, that part of the first conductor which adjoins the dielectric layer having a work function different from the work function of the corresponding part of the second conductor. In one embodiment of the invention, after the dielectric layer has been applied to the semiconductor body, a metal layer is applied to the said dielectric layer, and then a silicon layer is deposited on the metal layer and is brought into reaction with the metal layer at the location of the first semiconductor structure, forming a metal silicide. In one embodiment, those parts of the conductors which have different work functions are formed by etching a layer other than the silicon layer, in particular a metal layer, at the location of one of the two semiconductor structures. Furthermore, a further metal layer is applied over the silicon layer and is used to form a further metal silicide at the location of the second transistor. One embodiment of the invention is particularly suitable for use in CMOS technology and results in both PMOS and NMOS transistors with favourable properties.
摘要:
The invention relates to a method of manufacturing a semiconductor device (10) with a field effect transistor, in which method a semiconductor body (1) of a semiconductor material is provided, at a surface thereof, with a source region (2) and a drain region (3) and with a gate region (4) between the source region (2) and the drain region (3), which gate region comprises a semiconductor region (4A) of a further semiconductor material that is separated from the surface of the semiconductor body (1) by a gate dielectric (5), and with spacers (6) adjacent to the gate region (4), for forming the source and drain regions (2,3), in which method the source region (2) and the drain region (3) are provided with a metal layer (7) which is used to form a compound (8) of the metal and the semiconductor material, and the gate region (4) is provided with a metal layer (7) which is used to form a compound (8) of the metal and the further semiconductor material. The known method in which different metal layers are used to silicidate source and drain regions and gate regions (2,3,4) has several drawbacks. A method according to the invention is characterized in that before the spacers (6) are formed, a sacrificial region (4B) of a material that may be selectively etched with respect to the semiconductor region (4A) is deposited on top of the semiconductor region (4A), and after the spacers (6) have been formed, the sacrificial layer (4B) is removed by etching, and after removal of the sacrificial layer (4B), a single metal layer (7) is deposited contacting the source, drain and gate regions (2,3,4). This method is on the one hand very simple as it requires only a single metal layer and few, straight-forward steps and it is compatible with existing (silicon) technology, and on the other hand it results in a (MOS)FET which does not suffer from a depletion layer effect in the fully silicided gate (4).