WO2000016391A1 - Method for producing semiconductor device - Google Patents
Method for producing semiconductor device Download PDFInfo
- Publication number
- WO2000016391A1 WO2000016391A1 PCT/JP1999/004962 JP9904962W WO0016391A1 WO 2000016391 A1 WO2000016391 A1 WO 2000016391A1 JP 9904962 W JP9904962 W JP 9904962W WO 0016391 A1 WO0016391 A1 WO 0016391A1
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- Prior art keywords
- layer
- manufacturing
- semiconductor device
- cap layer
- film
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 110
- 239000004065 semiconductor Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 claims description 95
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 75
- 230000008569 process Effects 0.000 claims description 46
- 238000010438 heat treatment Methods 0.000 claims description 30
- 238000012545 processing Methods 0.000 claims description 23
- 229910003811 SiGeC Inorganic materials 0.000 claims description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
- 229910052710 silicon Inorganic materials 0.000 claims description 19
- 239000010703 silicon Substances 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 7
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 238000011282 treatment Methods 0.000 abstract description 17
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- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 32
- 238000012864 cross contamination Methods 0.000 description 17
- 150000004767 nitrides Chemical class 0.000 description 15
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66893—Unipolar field-effect transistors with a PN junction gate, i.e. JFET
- H01L29/66916—Unipolar field-effect transistors with a PN junction gate, i.e. JFET with a PN heterojunction gate
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
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- H01L21/02381—Silicon, silicon germanium, germanium
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
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- H01L21/0245—Silicon, silicon germanium, germanium
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- H01L21/02529—Silicon carbide
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- H01L21/02532—Silicon, silicon germanium, germanium
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
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- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System
- H01L21/28525—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System the conductive layers comprising semiconducting material
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/3143—Inorganic layers composed of alternated layers or of mixtures of nitrides and oxides or of oxinitrides, e.g. formation of oxinitride by oxidation of nitride layers
- H01L21/3145—Inorganic layers composed of alternated layers or of mixtures of nitrides and oxides or of oxinitrides, e.g. formation of oxinitride by oxidation of nitride layers formed by deposition from a gas or vapour
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/31604—Deposition from a gas or vapour
- H01L21/31608—Deposition of SiO2
- H01L21/31612—Deposition of SiO2 on a silicon body
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
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- H01L21/3185—Inorganic layers composed of nitrides of siliconnitrides
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823807—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the channel structures, e.g. channel implants, halo or pocket implants, or channel materials
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66234—Bipolar junction transistors [BJT]
- H01L29/66242—Heterojunction transistors [HBT]
Definitions
- the present invention relates to a manufacturing method for preventing cross-connection in a manufacturing process of a semiconductor device containing Ge. Background art
- Si Ge mixed crystal semiconductors have the property that the band gap is narrower than that of Si and the hole mobility is high.
- the base layer of a Si bipolar transistor is composed of a SiGe mixed crystal, thereby realizing an improvement in the high-frequency characteristics of a bipolar transistor. can do.
- Such a semiconductor device using Si Ge has the advantage that it is inexpensive and easily integrated at a higher level than a device using a compound semiconductor such as GaAs. It can be formed on an inexpensive, large-diameter Si substrate that is easily available, and can be used to manufacture existing Si integrated circuits for which high integration technology has been established. And can be produced in almost the same manufacturing process.
- An object of the present invention is to grasp the conditions under which the cross-countermination phenomenon occurs as described above, and to take measures to reliably prevent cross-countermination based on the conditions. It is an object of the present invention to provide a method of manufacturing a semiconductor device for manufacturing a wafer having a semiconductor film including e and a wafer not having a semiconductor film including Ge by using a common manufacturing line as much as possible.
- the first method of manufacturing a semiconductor device uses a shared manufacturing line for processing a wafer having a semiconductor film containing Ge and a wafer having no semiconductor film containing Ge.
- a method of manufacturing a semiconductor device having a semiconductor film including: (a) performing a process of substantially exposing the semiconductor film including Ge; and after the step (a), including the Ge. After the step (b) of forming a cap layer having a function of preventing Ge from scattering into the air on the semiconductor film, and after the step (b), a wafer having the semiconductor film containing Ge is removed. 0 (a step (c) of treating at a temperature of TC or higher).
- the treatment at a high temperature of 100 ° C. or more is performed in a state where the semiconductor film containing Ge is covered with the cap layer. Even if it is performed on a shared production line, Ge will fly in the air. It is prevented from scattering. Therefore, when processing a wafer that does not have a Ge-containing semiconductor film on a shared manufacturing line, cross-contamination due to the intrusion of Ge into the active region of the wafer. Can be suppressed.
- -Step (b) can be performed on a different manufacturing line from the shared manufacturing line, and step (c) can be performed on the shared manufacturing line. This is a particularly effective method when the step of forming the cap layer is a treatment under a high temperature of 70 CTC or more.
- both of the above steps (b) and (c) can be performed on the above-mentioned shared production line.
- steps (b) and (c) may be performed on a production line different from the common production line.
- a step of forming another cap layer on the cap layer may be further included. This is because Ge may diffuse near the surface of the first cap layer.
- the cap layer is The thickness of the cap layer is defined as W (nm), heat treatment time t (min), and force s'
- the cap layer is formed by silicon. And the cap layer has a thickness W (nm), heat treatment time t (min),
- the temperature in the step (c) may be 8 or less.
- the above-mentioned cap layer is made of silicon, and the thickness of the cap layer is smaller than the thickness W (nm) and the heat treatment time t (min) by gd.
- the second method for manufacturing a semiconductor device of the present invention uses a shared manufacturing line for processing a wafer having a semiconductor film containing Ge and a wafer having no semiconductor film containing Ge.
- a method of manufacturing a semiconductor device having a semiconductor film including: (a) performing a process of substantially exposing the semiconductor film including Ge; and after the step (a), the common manufacturing line. (B) treating a wafer having the semiconductor film containing Ge at a temperature of 700 ° C. or more on a different production line from the wafer.
- a step of forming a cap layer having a function of preventing Ge from scattering into the air on the semiconductor film containing Ge (by further including c), the subsequent processing is performed in a state where the cap layer in which Ge is hardly diffused is provided, so that cross contamination can be suppressed more reliably.
- the semiconductor film containing Ge is constituted by at least one of SiGe, SiGeC, GeC, and Ge. It is preferred that
- the cap layer is made of at least one of silicon, silicon oxide, silicon nitride, and silicon oxynitride. It is preferred that BRIEF DESCRIPTION OF THE FIGURES Figures 1 (a) to 1 (i) show changes in the spectrum of the flight time (TOF spectrum) during heating.
- Figures 2 (a) and 2 (b) are TOF spectrum diagrams showing the results of the analysis of the composition of the surface layer (Si cap layer) of the substrate before and after the heat treatment, respectively, by the slow ion scattering method. It is. -- Figures 3 (a) to 3 (c) show the process in the case where the process of exposing to a high temperature of 700 ° C or more (high temperature process) is included in the manufacturing process of the semiconductor device using the shared line.
- FIG. 7 is a flow chart illustrating an example of control.
- FIGS. 4A to 4F are cross-sectional views showing a first specific example of a manufacturing process of an HCMOS device in which a channel region is constituted by a semiconductor layer containing Ge.
- FIGS. 5A to 5D are cross-sectional views showing a second specific example of a manufacturing process of an HCMOS device in which a channel region is constituted by a semiconductor layer containing Ge.
- 6 (a) to 6 (k) are cross-sectional views showing an example of a manufacturing process of an HBT in which a base layer is formed of SiGe.
- FIG. 7 is a cross-sectional view showing a process up to the formation of the SiGe layer in the manufacturing process of the BiCMOS device having the HBT in which the base layer is formed of SiGe.
- FIG. 8 is a cross-sectional view showing a process up to forming an emitter opening in a manufacturing process of a BiCMOS device having an HBT in which a base layer is formed of SiGe.
- Figure 9 shows the process of manufacturing a BiCMOS device with an HBT in which the base layer is composed of SiGe until the emitter electrode and external base electrode are formed. It is sectional drawing.
- This sample was introduced into a low-speed ion scattering analyzer with a substrate heating mechanism, and the in-situ low-speed ion scattering method was used to determine the degree to which Ge was released from the surface of the SiGe layer during heat treatment. Observations were made.
- the substrate was heated by a graph heater, and the temperature was raised and lowered at a rate of 20 ° C / min, and the heat treatment temperature was between room temperature and 900 ° C.
- FIGS. 1 (a) to (i) are diagrams showing changes in the spectrum (TOF spectrum) of the flight time during the heating.
- H e + helium ions
- mass M helium ions
- the time of flight of the scattered ion from the sample surface to the detector is proportional to (M + m) / (M-m). Therefore, when the spectrum (TOF spectrum) with respect to the flight time is measured, the element that gives the peak value in the spectrum can be found, and the element contained in the substrate surface must be specified. Can be.
- He + was implanted into the substrate at an acceleration energy of 3 keV.
- the ⁇ 0 F spectrum (a) of the substrate before the heat treatment shows that the Si atoms existing on the surface of the Si Ge layer and the Ge Scattering peaks corresponding to the atoms were observed around 640 nsec and 580 nsec, respectively.
- Such calibration Tsu layer Ru bovine function as up layer, S i layer (monocrystalline silicon co down layer, polysilylene co emission layer or Amoru off Asushiri co down layer), S i 0 2-layer, S i 2 N 3-layer, S i ON layer (so-called oxynitride), and the like laminated film thereof.
- the Si layer was selected as the most versatile cap layer, and the thickness of the Si layer was examined to determine how thick the Ge could be prevented from diffusing in the air.
- FIG. 4 is a TOF spectrum diagram showing the result of analyzing the composition of a surface layer (Si cap layer) by a low-speed light scattering method.
- Fig. 2 (a) this is the TOF spectrum before heat treatment, but since the surface is covered with Si, the signal of Ge is not detected, and only the signal of Si is measured. Was done.
- FIG. 2 (b) even after the heat treatment at 75 ° C., only the Si signal was measured, and the Si Ge layer on the outermost surface of the Si cap layer was measured. There was no diffusion of Ge atoms from. Therefore, the amount of Ge released from this sample was found to be much smaller than when the Si Ge layer was exposed. This result indicates that covering the SiGe layer with the Si layer has the effect of preventing cross contamination.
- the diffusion rates of Ge into the Si layer at the heat treatment temperatures of 700, 750 ° C and 820 ° C are 0.017 nm mZm in and 0.04 mm, respectively. It was found that they were 6 nm / min and 0.063 nm / min.
- the process of exposing the wafer to such high temperatures includes not only annealing (heat treatment) but also processes that need to be performed at high temperatures such as CVD. Therefore, in this specification, the treatment performed at such a high temperature is collectively referred to as “high-temperature treatment”. Then, it can be understood that cross contamination can be prevented by setting the thickness W (nm) of the Si cap layer with respect to the high temperature processing time t (min) according to the range of the high temperature processing temperature as follows.
- FIGS. 3 (a) to 3 (c) show process control when a process of exposing to a high temperature of 700 ° C. or higher (high-temperature process) is included in a semiconductor device manufacturing process using a shared line. It is a flowchart which shows an example.
- the Si Ge whose surface is substantially exposed on the wafer before the high-temperature processing of 700 ° C. or more is performed on the shared line. It is determined whether or not there is a layer, and if there is no SiGe layer exposed on the surface, a high-temperature treatment of 700 ° C. or more is performed on the shared line as it is.
- the SiGe layer in the wafer is substantially exposed.
- To remove the wafer from the shared line transfer it to another line (or at the shared line), cover the SiGe layer with a cap layer such as a Si layer, and then use the shared line.
- the subsequent steps are performed.
- the cap layer even if a high-temperature treatment of 700 ° C or more is performed on the shared line, the presence of the cap layer can prevent Ge from scattering into the air in the shared line. it can . Therefore, it is possible to prevent cross-counter emission.
- the cap layer may be formed by a common line.
- the SiGe layer in the wafer when the SiGe layer in the wafer is substantially exposed, the wafer is removed from the common line and transferred to another line, and the Si line is transferred to another line. After coating the Ge layer with a cap layer such as a Si layer, perform a process involving a high temperature of 700 ° C or more on another line, return to the shared line, and perform the subsequent steps. Proceed. On the other hand, when the SiGe layer in the wafer is not substantially exposed, high-temperature processing of 700 ° C. or more is performed on the shared line, and the subsequent steps are performed. By this method, when the SiGe layer in the wafer is substantially exposed, high-temperature processing of 700 ° C. or more is not performed on the shared line.
- G e does not fly into the air. Therefore, it is possible to prevent cross-counter emission.
- high-temperature processing at 700 ° C. or higher can be performed on a shared line.
- another cap layer is further formed on the cap layer.
- it may be formed by another line. This is because, in a high-temperature treatment at a temperature of 700 ° C. or more, Ge may diffuse to the vicinity of the surface of the initially formed capping layer. In this case, two cap layers are laminated. However, even if the thickness of the cap layer is large, it does not matter if a problem does not occur in the subsequent steps.
- any of FIGS. 3 (a) to (c) By performing process control, it is possible to prevent problems caused by Ge scattering into shared line equipment.1 Example of manufacturing process of HCMOS device—
- FIGS. 4 (a) to 4 () are cross-sectional views showing a first specific example of a manufacturing process of an HCMOS device in which a channel region is constituted by a semiconductor layer containing Ge.
- p-cells 11 and n-cells 12 are formed on an Si substrate 10 by ion implantation. This step is performed on the lines that form the normal CMOS device, ie, shared lines.
- a Si layer 13 including a three-doped layer and a SiGeC layer 14 are formed on each of the cells 11 and 12 by a UHV-CVD method. (Ge: 8.2%, C: 1%), a SiGe layer 15 and a Si layer 17 are grown, respectively.
- This Si layer 17 is, for example, used to prevent the Si Ge layer 15 from being substantially exposed in a later step. In this case, it is a thickness that satisfies any of the above 1 ⁇ 3.
- a ⁇ -doped layer (carrier supply layer) containing a high concentration of impurities is formed near the upper end of the Si layer 13, and between the Si layer 13 and the SiGeC layer 14.
- a single layer of a SiGe layer containing no impurity is also formed in these layers, illustration of these layers is omitted for easy viewing.
- the process shown in FIG. 4 (b) is performed on a dedicated line provided separately from the shared line.
- the step of forming the Si layer 13 including the d-doped layer is performed on a shared line, and the spacer layer, the SiGeC layer 14, the SiGe layer 15 and the Si layer 1 are formed.
- the step of forming 6 may be performed on another line.
- a trench for trench separation is formed in order to electrically separate the MOS transistor and the NMOS transistor.
- the nitride film 32 and a part of the pad oxide film 31 are formed by photolithography and etching.
- the lower Si layer 17, SiGe layer 15, SiGeC layer 14, A part of the Si layer 13 and the like is removed by etching to form a groove.
- the SiGeC layer 14 and the SiGe layer 15 are also exposed on the side surfaces of the groove.
- the trench is filled with a silicon oxide film to form a trench isolation 20.
- This step is performed by depositing a silicon oxide film on the substrate and flattening it by CMP or the like. If the process of depositing a silicon oxide film for trench embedding is performed by CVD or the like at a low temperature of 700 ° C. or less, the series shown in FIGS. 4 (b) and (c) It is also possible to perform all of the steps on a shared line.
- the Si layer 13, the SiGeC layer 14, the SiGe layer 15, and the Si layer 17 become the SMOS on the NMOS transistor side, respectively.
- i layer 13 n, Si Ge C layer 14 n, Si Ge layer 15 ⁇ , Si layer 17 ⁇ , and Si layer 13 p, Si G on the PMO S transistor side It is separated into an eC layer 14p, a SiGe layer 15p, and a Si layer 17P.
- the surfaces of the Si layers 17n and 17p are oxidized to form gate insulating films 19n and 19p, respectively. I do.
- This process is performed on a shared line.
- the thickness of the Si layer 17 formed in the step shown in FIG. 4 (b) should be a thickness that satisfies any of the above 1 to 3 in consideration of the reduction in thickness due to thermal oxidation. ing.
- a polysilicon film is deposited on the entire surface of the substrate, and then patterned to form a gate insulating film 19 for each of the NMOS transistor and the PMOS transistor.
- Gate electrodes 18n and 18p are formed on n and 19p, respectively.
- the source 'drain region 16 ⁇ is formed on the NMOS transistor side by implanting l-ion ( ⁇ +).
- a source-drain region 16 ⁇ is formed on the ⁇ ⁇ 0 S transistor side by implanting boron ions ( ⁇ +).
- the depth of the source / drain region 16 ⁇ of the ⁇ 0 S transistor should be at least as deep as the carrier accumulation layer in the SiGeC layer 14 n.
- the depth of the source 'drain region 16p of the transistor should be at least deeper than the carrier storage layer in the SiGe layer 15p. This is because a channel is formed in each carrier storage layer in the SiGeC layer 14n and the SiGe layer 15p.
- an opening is formed in a portion of the gate insulating film 19 ⁇ , 19 ⁇ above the source 'drain region 16 ⁇ , 16 ⁇ .
- source-drain electrodes 21 ⁇ and 21 ⁇ are formed in the openings of the gate insulating films 19 ⁇ and 19 ⁇ , respectively.
- the process of forming the source-drain electrodes 21 ⁇ and 21 ⁇ generally involves a high-temperature treatment of 700 ° C. or more (generally, 800 to 1 0 0 0).
- the Si layer is formed by overetching.
- the thickness of 17 ⁇ , 17 ⁇ is reduced, and the Ge scatters from the SiGe layer 15 ⁇ , 15 ⁇ in the source 'drain region 16 ⁇ , 16 ⁇ into the air.
- the step of forming the source / drain electrodes is performed on a line different from the shared line.
- the source' drain is required.
- the step of forming the connection electrode may be performed on a shared line. As a result, an HCMOS device including an NMOS transistor and a PMOS transistor is formed on the Si substrate 10.
- FIGS. 5A to 5D are cross-sectional views showing a second specific example of a manufacturing process of an HCMOS device in which a channel region is constituted by a semiconductor layer containing Ge.
- p-cells 11 and n-cells 12 are formed on the Si substrate 10 by ion implantation. This process is performed on the lines that form a normal CMOS device, ie, shared lines.
- the Si layer 13 including the ⁇ -doped layer and the 5 6: 8.2%, C: 1%) the SiGe layer 15 and the Si layer 17 are grown respectively.
- the S i layer 17 has a thickness that satisfies, for example, any of the above (1) to (3) in order to prevent the S i Ge layer 15 from being substantially exposed in a later step.
- a ⁇ -doped layer (carrier supply layer) containing a high concentration of impurities is formed near the upper end of the Si layer 13, and the Si layer 13 and the SiGeC layer 14 are formed. Between them, there is also formed a spacer layer made of a SiGe layer containing no impurities, but these layers are not shown for clarity.
- the process control in the steps so far is performed in the same manner as in the first specific example.
- a trench for trench isolation is formed to electrically isolate the PMSO transistor and the NMOS transistor.
- the nitride film 32 and a part of the pad oxide film 31 are formed by photolithography and etching.
- the lower Si layer 17, SiGe layer 15, and SiGeC layer 14 are formed.
- a part of the Si layer 13 and the like is removed by etching to form a groove.
- the SiGeC layer 14 and the SiGe layer 15 are also exposed on the side surfaces of the groove.
- a thick buried polysilicon film 34 is deposited over the entire surface of the substrate.
- the step of forming the underlying nitride film 33 is performed at a high temperature of about 700 to 80 CTC. This is usually done on a separate line from the shared line.
- the underlying nitride film 33 functions as a cap layer for preventing Ge from scattering into the air, the step of depositing the buried polysilicon film 34 can be performed on a shared line. it can. Note that an oxide film may be provided in place of the underlying nitride film 33.
- an element isolation 25 in which polysilicon is buried in the trench is formed by flattening with CMP or the like.
- the upper portion of the element isolation 25 is formed as a thick oxide film formed by oxidizing polysilicon.
- the Si layer 13, SiGe C layer 14, SiGe layer 15 and Si layer 17 force are each applied to the NMO S transistor side.
- S i layer 13 n, S i G e C layer 14 n, S i G e layer 15 ⁇ , S i layer 17 ⁇ , and S i layer 13 p, S i G on the PMO S transistor side It is separated into an eC layer 14p, a SiGe layer 15p, and a Si layer 17P.
- the surfaces of the Si layers 17n and 17p are oxidized to form gate insulating films 19n and 19p, respectively. This process is performed on a shared line. For this purpose, the thickness of the Si layer 17 formed in the step shown in FIG. ing.
- Subsequent steps perform the same processing as the steps shown in FIGS. 4 (d) to (f) in the first specific example, so that illustration and description of the steps are omitted.
- FIGS. 6A to 6K are cross-sectional views illustrating an example of a manufacturing process of an HBT in which a base layer is formed of SiGe.
- the Si containing a low concentration of n-type impurity is formed.
- single binding Akiramaku by Epitakisharu growth first on the S i single crystal film, the second active region Rel, to form a L 0 C 0 S film 4 2 surrounding the Re 2.
- the epitaxially grown Si single crystal film becomes the Si collector layer 43b in the first active region Rel, In 2 of the active region R e 2 has a collector wall layer 4 3 c.
- the process shown in Fig. 6 (a) is performed on a shared line.
- a boron-doped p-type SiGe layer 44 having a thickness of about 50 nm and a phosphorus were formed on the entire surface of the substrate by UHV-CVD.
- the Si layer 45 having a thickness of about 150 nm is formed by sequential epitaxy.
- the SiGe layer 44 and the Si layer 45 are monocrystalline films on the portion where the silicon surface is exposed, and are polycrystalline films on the L0C0S film 42. is there.
- the step of forming the SiGe layer 44 and the Si layer 44 is performed on a dedicated line provided separately from the shared line. After that, the process up to the process shown in Fig. 6 (e) is performed on another line.
- a BSG (boron silicate glass) film 46 containing about 8% of poron was deposited on the entire surface of the substrate to a thickness of about 200 nm by atmospheric pressure CVD. Thereafter, the BSG film 46 is patterned by a photolithography process and a dry etching process, and the portion of the second active region Re 2 of the BSG film 46 is entirely removed, while the BSG film 4 is removed.
- An opening 46a for forming an emitter electrode is formed on the first active region R el.
- a protective oxide film 47 having a thickness of about 100 nm is deposited on the entire surface of the substrate by the CVD method.
- This protective oxide film 47 is a BSG film in the next process.
- the boron escapes from the BSG film 46 into the gas phase and adheres to the exposed silicon surface to prevent diffusion into the substrate. Further, after the protection oxide film 47 is formed, even if the process is performed at a high temperature of 700 ° C. or more, the protection oxide film 47 prevents Ge from scattering into the air. Therefore, the subsequent processing is performed on the shared line.
- a heat treatment is performed at 95 ° C. for 10 seconds by the RTA (Rapid Thermal Anneal) method to remove the boron in the BSG film 46 from the Si layer 45 and the Si layer 45.
- RTA Rapid Thermal Anneal
- n-type Portions 48 X and 48 z of the S i layer 45 and the S i collector layer 43 b located below the BSG film 46 are inverted to p-type, and the BSG The portion 48 y located below the film 46 has a further increased p-type impurity concentration and a low resistance.
- S i layer 4 5, S i G e layer 4 4 and co each portion of Lek data layer 4 in 3 b 4 8 X, 4 8 y, 4 8 z external base layer 4 8 b over is formed You.
- the portion of the Si layer 45 where the impurity from the BSG film 46 is not diffused, that is, the portion below the opening 46 a remains the n-type Si emitter layer 49.
- the protective oxide film 47 is etched back by anisotropic dry etching to form a side wall 50 on the side surface of the BSG film 46.
- This side wall 50 is for ensuring sufficient withstand voltage between the high-concentration emitter layer to be formed later and the external base layer, and at the same time, at a high temperature of 100 ° C. or more. At this time, it has a function of preventing Ge from scattering from the end of the SiGe layer 44 into the air.
- a highly-doped polysilicon film serving as an emitter electrode and a collector electrode was deposited by LPCVD. Thereafter, the polysilicon film is patterned by dry etching to form an emitter electrode 51 on the first active region Rel and an emitter electrode 51 on the second active region Re2. Each of the collector electrodes 52 is formed.
- an interlayer insulating film 53 made of silicon oxide is deposited by a CVD method.
- the phosphorus is diffused from the emitter electrode 51 to the Si emitter layer 49 by heat treatment, thereby forming a high-concentration emitter layer 49. While forming a, phosphorus is diffused from the collector electrode 52 into the collector wall layer 43 c to form a collector contact layer 54.
- FIG. 7 to 9 are cross-sectional views illustrating an example of a manufacturing process of a BiCMS device including an HBT in which a base layer is formed of SiGe.
- the N-type epitaxial layer 62 is formed using a normal L0C0S method. forming an isolation oxide film 6 3 -type Epitaki interstitial layer 6 2, Ba I Paula preparative La Njisuta forming region in the P-type silicon co emissions substrate 6 on 1 R bP and MO S preparative La Njisuta forming region R m. s and the MOS transistor formation region Rm. In s , the PMO SFET formation region R pm . s and NMO SFET formation region R nmos are defined.
- a protective oxide film (not shown) is formed on the N-type epitaxial layer 62.
- An N-type buried layer 64 is formed in s.
- the collector region 62A is located above the N-type buried layer 6 in the N-type epitaxial layer 62 of the bi-bola transistor forming region Rbp.
- a trench groove 65 is formed below a portion of the isolation oxide film 63 surrounding the collector region 62A, and a trench sidewall oxide film 66a is sandwiched between the trench grooves 65.
- the first polysilicon film 66b is buried in the trench to form a trench isolation 66 comprising a trench sidewall oxide film 66a and a first polysilicon film 66b.
- a first channel stopper layer 67 is formed near the lower portion of the trench separation 6.
- the trench groove 65 when the trench groove 65 is formed, an opening is formed in the isolation oxide film 63, and after the trench isolation 66 is formed, the opening is formed above the trench isolation 66.
- a cap oxide film is formed in the opening, and the cap oxide film and the isolation oxide film 63 can be integrated.
- a collector wall region and a collector electrode are formed beside the cap oxide film at the left end in the figure.
- the PM OSFET formation region R Pm is formed.
- the first threshold control layer 68, the punch-through stopper layer 69, the second channel stopper layer 70, the N-type layer 71, the first gate oxide film 75A, A first gate electrode 76A, a first side wall 79, a P-type low-concentration source 'drain layer 77, and a P-type high-concentration source' drain layer 80 are formed.
- the NMO SFET formation region R nm the second threshold control layer 72, the third channel stopper layer 73, P-type! Double layer 74, second gate oxide film 75B, second gate electrode 76B, first side wall 79, N-type low concentration source 'drain layer 78, An N-type high concentration source drain layer 81 is formed.
- a second TEOS film 82 is deposited on the entire surface of the P-type silicon substrate 61.
- an opening is formed in the second TEOS film 82 of the bipolar transistor formation region R bP so that the collector region 62A is exposed, and then the collector region 62A and the second TEOS film 8 are formed.
- a SiGe layer 84 serving as a base region is epitaxially grown on 2 so as to completely fill the opening.
- the NM OSFET and the PM OSFET are also formed when the SiGe layer 84 is formed thereon. Ge cross-contamination to the active region of the PMOS FET can be reliably prevented.
- the third TEOS film 85 is patterned, On the TEOS film 85, a contact window 85a for a base electrode is formed to open above a portion of the SiGe layer 84 that will be an external base electrode.
- the third TEOS film 85 as a mask, for example, boron ions are accelerated to the SiGe layer 84 at an acceleration energy of 40 KeV and a dose of 1.0 X 10 13 Z cm 2 Ion implantation under the conditions
- the RTA or the like is performed on another line provided separately from the shared line.
- the P-type silicon substrate 61 was sequentially washed with sulfuric acid and hydrogen peroxide before the furnace step and boiled with a mixed solution of hydrogen peroxide and ammonia water.
- the natural oxide film (not shown) existing on the surface of the portion of the e-layer 84 exposed to the contact window 85a for the base electrode is completely removed by dip etching. This Thereby, the natural oxide film can be reliably and easily removed.
- an amorphous silicon film serving as an external base electrode is formed.
- 86 is grown at, for example, 5300C so that the contact window 85a for the base electrode is completely filled. Then, for example,! If Boro N'i on the acceleration energy 8 K e V, implanted at conditions of a dose of 3. 0 X 1 0 15 or Z cm 2.
- the fourth TEOS film 87 and the second amorphous silicon film 8 6 is patterned to form an emitter electrode opening window 88 in the amorphous silicon film 86 and the fourth TEOS film 87.
- a fifth TEOS film 89 is deposited over the entire surface of the fourth TEOS film 87 including the opening window 88 for the emitter electrode, and the fifth TEOS film 89 is formed. ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 8 8 8 8 ⁇ ⁇ .
- the portion of the amorphous silicon film 86 exposed to the emitter electrode opening window 88 is covered with the fifth TEOS film 89.
- a third polysilicon film doped with an N-type impurity is deposited on the entire surface of the fifth TEOS film 89, and then the third polysilicon film is formed.
- a third polysilicon film is formed on the fifth TEOS film 89 covering the wall surface of the emitter electrode opening window 88.
- a second side wall 90 is formed.
- the portion of the third TEOS film 85 surrounded by the second side wall 90 is removed by photo-etching, so that the third TEOS film 85 has an emitter electrode.
- a contact window 85b is formed.
- a fourth polysilicon film doped with an N-type impurity is formed on the substrate by a contact electrode window 85 b for an emitter electrode and an opening window 8 for an emitter electrode. After depositing so that 8 is completely buried, the fourth polysilicon film is patterned to form an emitter electrode 91.
- a fifth TEOS film 89, a fourth TEOS film 87, an amorphous silicon film 86, and a third TEOS film are formed by photolithography and dry etching. 8 and the SiGe layer 84 are successively dry-etched to form an amorphous layer.
- An external base electrode 86 A made of a silicon film 86 is formed.
- the P-type silicon substrate 61 is subjected to a rapid heating process (RTA) at, for example, 95 ° C. for 15 seconds, to thereby implant impurities implanted into the external base electrode 86 A and the like. Activate.
- RTA rapid heating process
- the side surfaces of the fifth TEOS film 89, the fourth TEOS film 87, the amorphous silicon film 86, the third TEOS film 85, and the SiGe layer 84 An oxide film wall or a nitride film wall functioning as a cap layer for preventing Ge from scattering into the air may be provided thereon. This corresponds to the process control shown in FIG.
- RTA is performed on another line, and thereafter, the fifth TEOS film 89, the fourth TEOS film 87, the amorphous silicon film 86, the third
- the subsequent processing is performed. This may be done on a shared line. This corresponds to the process control shown in Fig. 3 (c).
- the process of manufacturing a device having a SiGe layer was mainly described. However, a device having a SiGeC layer, a GeC layer, a Ge layer, and the like was described.
- the present invention also provides a method for manufacturing a semiconductor device by purchasing a wafer on which a semiconductor layer containing Ge, such as a SiGe layer, a SiGeC layer, a GeC layer, and a Ge layer, has already been formed. Needless to say, it can be applied to the case. -Industrial applicability
- the present invention can be used for the manufacture of HBT, HCMOS, etc., which have a film containing Ge in part, among semiconductor devices mounted on electronic equipment.
Description
Claims
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US09/787,108 US6620665B1 (en) | 1998-09-14 | 1999-09-13 | Method for fabricating semiconductor device |
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US7687786B2 (en) * | 2008-05-16 | 2010-03-30 | Twin Creeks Technologies, Inc. | Ion implanter for noncircular wafers |
CN102171793A (zh) * | 2008-10-02 | 2011-08-31 | 住友化学株式会社 | 半导体基板、电子器件、以及半导体基板的制造方法 |
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JPH05226620A (ja) * | 1992-02-18 | 1993-09-03 | Fujitsu Ltd | 半導体基板及びその製造方法 |
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- 1999-09-13 DE DE69940074T patent/DE69940074D1/de not_active Expired - Lifetime
- 1999-09-13 EP EP99943289A patent/EP1143502B1/en not_active Expired - Lifetime
- 1999-09-14 TW TW088115831A patent/TWI233630B/zh not_active IP Right Cessation
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US6861316B2 (en) | 2002-01-09 | 2005-03-01 | Matsushita Electric Industrial Co., Ltd. | Semiconductor device and method for fabricating the same |
US7145168B2 (en) | 2002-01-09 | 2006-12-05 | Matsushita Electric Industrial Co., Ltd. | Semiconductor device |
JP2006516362A (ja) * | 2003-01-14 | 2006-06-29 | アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド | 歪みシリコンプロセス用にシャロートレンチ絶縁体を形成するプロセス |
JP2014521229A (ja) * | 2011-07-18 | 2014-08-25 | エピガン ナムローゼ フェンノートシャップ | Iii−vエピタキシャル層を成長させるための方法 |
US9748331B2 (en) | 2011-07-18 | 2017-08-29 | Epigan Nv | Method for growing III-V epitaxial layers |
Also Published As
Publication number | Publication date |
---|---|
DE69940074D1 (de) | 2009-01-22 |
TWI233630B (en) | 2005-06-01 |
EP1143502A4 (en) | 2005-03-16 |
EP1143502B1 (en) | 2008-12-10 |
US6620665B1 (en) | 2003-09-16 |
EP1143502A1 (en) | 2001-10-10 |
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