WO2016047047A1 - Soiウェーハの製造方法 - Google Patents
Soiウェーハの製造方法 Download PDFInfo
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- WO2016047047A1 WO2016047047A1 PCT/JP2015/004358 JP2015004358W WO2016047047A1 WO 2016047047 A1 WO2016047047 A1 WO 2016047047A1 JP 2015004358 W JP2015004358 W JP 2015004358W WO 2016047047 A1 WO2016047047 A1 WO 2016047047A1
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- soi
- film thickness
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 66
- 238000009826 distribution Methods 0.000 claims abstract description 121
- 238000005259 measurement Methods 0.000 claims abstract description 50
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- 238000000034 method Methods 0.000 claims description 270
- 238000004140 cleaning Methods 0.000 claims description 82
- 238000005530 etching Methods 0.000 claims description 52
- 238000003754 machining Methods 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000005468 ion implantation Methods 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 9
- 239000010409 thin film Substances 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 4
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- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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Definitions
- the present invention relates to a method for manufacturing an SOI wafer, and is particularly referred to as FD-SOI (Fully Depleted Silicon-On-Insulator), which is an SOI wafer that requires extremely high SOI layer thickness uniformity. It relates to a manufacturing method.
- FD-SOI Fluly Depleted Silicon-On-Insulator
- the SOI wafer is heat-treated in a batch type heat treatment furnace, and Si on the surface of the SOI layer is oxidized to be transformed into an oxide film.
- a method for removing the oxide film has been performed.
- Patent Document 1 In this two-stage thinning method, as shown in Patent Document 1, after removing the oxidized oxide film, the SOI film thickness is measured, and the etching process of the next stage is taken based on the measured value. The method of setting the bill has been taken. Further, in the above-described two-stage thinning process by forming and removing the oxide film and etching, as a method of shortening the process, the film thickness of the SOI layer is measured by measuring the film thickness of the SOI layer with the oxide film remaining after oxidation. Based on the above, there has been proposed a method in which the oxide film removal and etching, and the cleaning process are performed in the same batch process of cleaning. In addition to the formation and removal of oxide films and the thinning by a batch-type cleaning machine, a method for controlling the thinning of the SOI layer using a single-wafer etching apparatus has also been proposed (Patent Document 2).
- the in-plane machining allowance variation occurs in the thinning process such as oxide film formation / removal and etching, and the SOI layer after the thinning process is formed.
- the in-plane film thickness distribution deteriorates, high-precision film thickness uniformity is required such that all points on the wafer surface are within the target SOI film thickness ⁇ 0.5 nm, such as FD-SOI wafers.
- the requirement of film thickness uniformity could not be satisfied.
- the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a method for manufacturing an SOI wafer that can manufacture an SOI wafer having excellent in-plane film thickness uniformity of the SOI layer after the thinning process.
- a step of measuring the SOI film thickness of the SOI wafer on which the SOI layer is formed before the thinning step (A1) a step of measuring the SOI film thickness of the SOI wafer on which the SOI layer is formed before the thinning step; (A2) When performing the thinning step based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the step (A1) and the in-plane allowance distribution in the thinning step obtained in advance.
- an SOI wafer having excellent in-plane film thickness uniformity of the SOI layer after the thinning process for adjusting the SOI film thickness can be manufactured.
- a method for manufacturing an SOI wafer having a thinning process for adjusting the SOI film thickness of the SOI wafer on which the SOI layer is formed (B0) performing a heat treatment in an oxidizing gas atmosphere to form a thermal oxide film on the surface of the SOI layer; (B1) a step of measuring the SOI film thickness of the SOI wafer on which the thermal oxide film is formed in the (B0) step with the thermal oxide film; (B2) When performing the thinning step based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the (B1) step and the in-plane allowance distribution in the thinning step obtained in advance.
- the SOI layer is thinned by controlling the etching amount of the SOI layer according to the SOI film thickness obtained in the step (B1) by batch cleaning including thermal oxide film removal and etching of the SOI layer. Process, The manufacturing method of the SOI wafer containing this is provided.
- the thermal oxide film formed on the surface of the SOI layer is removed before the thinning process for adjusting the SOI film thickness, and the film thickness is adjusted by etching, thereby reducing the thinning process.
- An SOI wafer with good in-plane film thickness uniformity of the subsequent SOI layer can be manufactured.
- the method for manufacturing an SOI wafer having first and second thinning steps for adjusting the SOI film thickness of the SOI wafer on which the SOI layer is formed (C0) performing a heat treatment in an oxidizing gas atmosphere to form a thermal oxide film on the surface of the SOI layer; (C1) a step of measuring the SOI film thickness of the SOI wafer on which the thermal oxide film is formed in the step (C0), with the thermal oxide film attached, (C2) Based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the (C1) process and the in-plane machining allowance distribution in the first thinning process obtained in advance, the first Determining a rotational position of the SOI wafer when performing the thinning process, and rotating the SOI wafer around a central axis so as to be the rotational position; (C3) The etching amount of the SOI layer is obtained in the step (C1) by batch cleaning including the removal of the thermal oxide film on the SOI layer
- the second thinning process The manufacturing method of the SOI wafer containing this
- a first film thickness reduction process for removing a thermal oxide film formed on the surface of the SOI layer before a film thickness reduction process for adjusting the SOI film thickness, and a target film thickness by etching By the two-stage thinning process of the second thinning process to be adjusted, an SOI wafer with better in-plane film thickness uniformity of the SOI layer after the thinning process can be manufactured.
- the controllability of the film thickness of the SOI layer after the thinning process can be further improved, and an SOI wafer can be manufactured.
- the rotational position is determined by determining the region showing the maximum value of the in-plane distribution of the SOI film thickness obtained by the film thickness measurement and the maximum of the in-plane machining allowance distribution in the previously obtained thinning process. It is preferable to determine the position where the region indicating the value matches.
- the rotation position is determined by determining the region showing the minimum value of the in-plane distribution of the SOI film thickness obtained by the film thickness measurement, and the minimum of the in-plane machining allowance distribution in the thinning step obtained in advance. It is preferable to determine the position where the region indicating the value matches.
- the rotational position is determined based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement and the in-plane machining allowance distribution in the thinning step obtained in advance.
- the in-plane distribution of the SOI film thickness after the thinning process when the angle is changed by a predetermined angle is calculated, and the difference between the in-plane maximum value and the in-plane minimum value of the SOI film thickness after the thinning process is calculated. It is preferable to determine the position to be the minimum.
- an SOI wafer having a better uniformity of in-plane film thickness of the SOI layer after the thinning process can be obtained. Can be manufactured.
- the step of measuring the SOI film thickness before the thinning step and the step of rotating the SOI wafer performed thereafter are performed in the same apparatus.
- the SOI layer is formed by bonding at least a bond wafer having a microbubble layer formed by ion implantation and a base wafer serving as a support substrate, and the bond using the microbubble layer as a boundary. It is preferable to carry out by an ion implantation peeling method including a step of peeling the wafer and forming a thin film on the base wafer.
- the ion implantation delamination method can be suitably used for forming the SOI layer in the method for producing an SOI wafer of the present invention.
- the SC1 solution can be suitably used in the thinning process of the method for manufacturing an SOI wafer of the present invention.
- an SOI wafer of the present invention for example, a method for removing the thermal oxide film formed on the surface of the SOI layer to reduce the thickness of the SOI layer, or a method for removing the thermal oxide film and adjusting the film thickness.
- a method of thinning an SOI layer by a two-stage thinning process an SOI wafer with excellent in-plane thickness uniformity of the SOI layer after the thinning process is controlled while controlling the film thickness of the SOI layer with high accuracy. Can be manufactured. Therefore, such a method is suitable as a method for manufacturing an FD-SOI wafer that requires extremely high SOI layer thickness uniformity.
- the manufacturing yield of an SOI wafer having a target SOI film thickness is improved, and as a result, the process cost can be reduced.
- the present inventors have a bias in the in-plane distribution of the SOI layer before the thinning process, and there is also a bias in the in-plane allowance distribution in the thinning process.
- the in-plane thickness uniformity of the SOI layer after the thinning step is I found it worse.
- the inventors measured the SOI film thickness before the thinning process from this, and based on the in-plane distribution of the measured SOI film thickness and the in-plane machining allowance distribution in the thinning process determined in advance, The rotational position of the SOI wafer when performing the thinning process is determined, and the thinning process is performed in a state where the SOI wafer is rotated around the central axis so as to be in such a rotational position.
- the in-plane film thickness uniformity of the SOI layer was found to be improved, and the present invention was completed.
- the present invention relates to a method for manufacturing an SOI wafer having a thinning process for adjusting the SOI film thickness of the SOI wafer on which the SOI layer is formed.
- A1 a step of measuring the SOI film thickness of the SOI wafer on which the SOI layer is formed before the thinning step;
- A2) When performing the thinning step based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the step (A1) and the in-plane allowance distribution in the thinning step obtained in advance.
- an SOI layer is first formed on the wafer, and then the SOI film thickness before the thinning process is measured (FIG. 1 (A1)).
- the SOI wafer when performing the thinning process based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the step (A1) and the in-plane machining allowance distribution in the thinning process previously obtained.
- the rotational position of the SOI wafer is determined, and the SOI wafer is rotated around the central axis so as to be the determined rotational position (FIG. 1 (A2)).
- the SOI layer of the SOI wafer rotated in the step (A2) is thinned (FIG. 1 (A3)).
- the method for forming the SOI layer is not particularly limited.
- the step of bonding a bond wafer having a microbubble layer formed by ion implantation and a base wafer serving as a support substrate and the microbubble layer are bounded.
- the ion implantation peeling method which has the process of peeling a bond wafer and forming a thin film on a base wafer.
- the ion implantation separation method an SOI wafer on which an SOI layer having an extremely thin SOI layer with a relatively small in-plane film thickness distribution is obtained.
- the SOI film thickness before the thinning process for adjusting the SOI film thickness of the SOI wafer on which the SOI layer is formed is measured.
- the SOI film thickness measurement before the thinning process is not particularly limited, and may be performed by a known method.
- step (A2) when the thinning process is performed based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the (A1) process and the in-plane machining allowance distribution in the thinning process obtained in advance.
- the rotational position of the SOI wafer is determined, and the SOI wafer is rotated about the central axis so as to be the determined rotational position.
- a thinning means for example, a batch type cleaning machine or a single wafer type
- the thickness of the SOI film may be reduced to a target value, and the thickness distribution may be obtained by measuring the SOI film thickness after the thinning.
- the determination of the rotational position of the SOI wafer when performing the thinning process is based on the in-plane distribution of the SOI film thickness obtained by measuring the film thickness in the process (A1), and the in-plane machining allowance distribution in the thinning process previously obtained. Based on. As described above, for example, when the portion where the SOI layer thickness before the thinning step is thin becomes a portion with a large allowance in the thinning step, the in-plane film of the SOI layer after the thinning step Since the thickness uniformity deteriorates, the rotational position may be determined so that the variation in the difference between the film thickness of the SOI layer before the thinning process and the machining allowance in the thinning process becomes small within the wafer surface. More specifically, for example, the following three criteria can be cited as criteria for determining the rotational position.
- the rotation position is a position where the region showing the maximum value of the in-plane distribution of the SOI film thickness obtained by the film thickness measurement and the region showing the maximum value of the in-plane machining allowance distribution in the thinning process obtained in advance match. decide.
- the rotation position is a position where the region showing the minimum value of the in-plane distribution of the SOI film thickness obtained by the film thickness measurement and the region showing the minimum value of the in-plane machining allowance distribution in the thinning process obtained in advance match. decide.
- the determination criteria for the rotational position are not limited to these, and the variation in the difference between the film thickness of the SOI layer before the thinning process and the machining allowance in the thinning process is reduced within the wafer surface. What is necessary is just to determine a rotation position on the basis of arbitrary.
- the process of measuring the SOI film thickness before the thinning process (process (A1)) and the subsequent process of rotating the SOI wafer (process (A2)) are performed in the same apparatus, the process is simplified. This is preferable because it is possible. More specifically, when a wafer rotation mechanism for alignment is attached to the SOI film thickness measuring apparatus used in the step (A1), the measured SOI film thickness is measured at the time of wafer collection immediately after the SOI film thickness measurement. The wafer rotation position is determined based on the in-plane distribution and the in-plane machining allowance distribution in the thinning process obtained in advance, and the wafer is rotated by using the wafer rotation mechanism in the SOI film thickness measurement apparatus so that the determined rotation position is obtained. After rotating the wafer, it can be collected in the cleaning carrier of the cleaning machine used in the thinning process, so that the SOI film thickness measurement and the wafer rotation before the thinning process can be performed in the same device. Can be realized.
- step (A3) the SOI layer of the SOI wafer rotated in step (A2) is thinned.
- a method of thinning the SOI layer for adjusting the SOI film thickness it is effective to apply thinning by cleaning (etching) using a batch type cleaning machine, but the present invention is not limited to this.
- etching using a single wafer cleaning machine, sacrificial oxidation treatment (batch processing, single wafer processing), gas etching with gas (HCl, etc.), dry etching, wet etching, hydrogen or
- gas etching with gas HCl, etc.
- dry etching wet etching
- hydrogen or Various thinning methods such as a planarization process accompanied by a reduction in the thickness of the SOI layer by heat treatment in a reducing atmosphere such as argon can be applied.
- the thinning step is preferably performed by immersing the SOI wafer in an SC1 solution (mixed aqueous solution of NH 4 OH and H 2 O 2 ).
- the rotational position is determined in advance so that, for example, the thin portion of the SOI film is on the upper side of the water tank of the batch cleaning machine before cleaning by the batch cleaning machine. If the wafer is rotated and charged in the cleaning carrier before cleaning, the in-plane distribution of the SOI film thickness after the thinning process by the batch type cleaning machine is improved compared to before the thinning process, or the film thickness is reduced. Deterioration of the in-plane distribution after the process can be minimized.
- the rotational position of each SOI wafer in the batch can be determined based on the SOI film thickness measurement results before the thinning process. After determining and rotating each wafer to the determined rotational position, it can be loaded into the cleaning carrier and cleaned, so that the in-plane distribution of each wafer can be improved with high accuracy and further processes can be performed. It can be simplified.
- the in-plane distribution allowance distribution of the Si etching tends to be uneven at the top and bottom in the water tank, and thus obtained by the SOI film thickness measurement before the thinning process.
- the thin portion of the SOI film is located on the upper side in the water tank of the single-sheet cleaning machine before thinning by the single wafer cleaning machine.
- the continuous rotation of the wafer during the thinning process is eccentric, the in-plane machining allowance distribution deviates from the concentric circle, so the wafer before the thinning process is rotated to the desired rotation position, so the thinning process
- the in-plane distribution of the subsequent SOI film thickness can be improved as compared to before the thinning process, or the deterioration of the in-plane distribution after the thinning process can be minimized.
- FIG. 2 shows an example of the in-plane distribution of the SOI film thickness at each stage when the SOI wafer is actually manufactured by the flow of FIG. 1 and the in-plane machining allowance distribution in the thinning process obtained in advance.
- 2A shows the in-plane distribution of the SOI film thickness before the thinning process
- FIG. 2B shows the in-plane machining allowance distribution obtained in the thinning process
- FIG. 2C shows the SOI after the wafer rotation.
- FIG. 2D shows the in-plane distribution of SOI film thickness after the thinning process.
- an SOI layer is formed on a wafer, and then, as a process (A1), the SOI film thickness before the thinning process is measured to obtain an in-plane distribution of the SOI film thickness as shown in FIG.
- the average value of the SOI film thickness is 16.7 nm
- the in-plane film thickness distribution (film thickness Range: maximum in-plane value of film thickness ⁇ minimum in-plane value) is 0.59 nm. It can be seen that the SOI film thickness is the thinnest at the measurement position at 7:30 (position of 225 degrees clockwise with the wafer upper end being 0 degrees).
- step (A2) the rotational position of the wafer when performing the thinning process is determined, but before that, it is thinned until the SOI film thickness becomes 12.0 nm by a batch type cleaning machine using SC1 solution.
- the in-plane allowance distribution in the process is measured in advance, and the in-plane allowance distribution in the thinning process as shown in FIG.
- the average machining allowance is 4.7 nm
- the in-plane machining allowance distribution (the machining allowance range: the in-plane maximum value of the machining allowance—the in-plane minimum value) is 0.18 nm
- the cleaning carrier It can be seen that the allowance is the smallest on the upper side.
- the in-plane distribution of the SOI film thickness obtained in the step (A1) (FIG. 2A) and the in-plane machining allowance distribution in the thinning step obtained as described above (FIG. 2B).
- the rotational position can be arbitrarily determined based on, for example, the above-mentioned criteria.
- the measurement position at 7:30 where the SOI film thickness is the smallest, is set in the cleaning carrier with the smallest machining allowance.
- batch cleaning is performed in a state of being aligned with the upper side of the plate is described.
- the measurement position at 7:30 when the SOI film thickness is the thinnest is rotated 135 degrees clockwise so as to be on the upper side (0 o'clock position) in the cleaning carrier (FIG. 2C).
- the rotation of the wafer at this time may be performed in the SOI film thickness measuring apparatus used in the step (A1) as described above, or may be performed separately after being taken out from the SOI film thickness measuring apparatus.
- step (A3) the wafer rotated 135 degrees clockwise as shown in FIG. 2C is transferred to the cleaning carrier, and the SC1 solution is added until the SOI film thickness reaches 12.0 nm.
- the film is thinned with the batch cleaning machine used.
- the average value of the SOI film thickness is 12.0 nm and the in-plane film thickness distribution (film thickness Range) is 0.56 nm as shown in FIG. Therefore, by performing the thinning process in the flow as shown in FIG. 1, the in-plane film thickness distribution can be improved as compared to before the thinning process, and the in-plane film thickness uniformity after the thinning process is improved. It can be seen that a good SOI wafer can be manufactured.
- the SOI wafer manufacturing method of the present invention can manufacture an SOI wafer having excellent in-plane film thickness uniformity of the SOI layer after the thinning process for adjusting the SOI film thickness.
- a method for manufacturing an SOI wafer having a thinning process for adjusting the SOI film thickness of the SOI wafer on which the SOI layer is formed (B0) performing a heat treatment in an oxidizing gas atmosphere to form a thermal oxide film on the surface of the SOI layer; (B1) a step of measuring the SOI film thickness of the SOI wafer on which the thermal oxide film is formed in the (B0) step with the thermal oxide film; (B2) When performing the thinning step based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the (B1) step and the in-plane allowance distribution in the thinning step obtained in advance.
- the SOI layer is thinned by controlling the etching amount of the SOI layer according to the SOI film thickness obtained in the step (B1) by batch cleaning including thermal oxide film removal and etching of the SOI layer. Process, The manufacturing method of the SOI wafer containing this is provided.
- the rotational position of the SOI wafer is determined, and the SOI wafer is rotated around the central axis so as to be the determined rotational position (FIG. 3 (B2)).
- the SOI film obtained in the step (B1) is subjected to batch type cleaning including removal of the thermal oxide film on the SOI layer surface of the SOI wafer rotated in the step (B2) and etching of the SOI layer.
- the SOI layer is thinned while controlling in accordance with the thickness (FIG. 3 (B3)).
- the formation of the thermal oxide film is not particularly limited as long as it is a method of performing heat treatment in an oxidizing gas atmosphere, and can be performed by a known method.
- the formation of the SOI layer, the (B1) step, and the (B2) step may be performed in the same manner as the formation of the SOI layer, the (A1) step, and the (A2) step, respectively.
- the etching amount of the SOI layer can be obtained in the step (B1) by batch cleaning including the removal of the thermal oxide film on the SOI layer surface of the SOI wafer rotated in the step (B2) and the etching of the SOI layer.
- the SOI layer is thinned while controlling according to the SOI film thickness (for example, in-plane average value).
- the specific method of thinning by batch cleaning including etching of the SOI layer is not particularly limited, but it is preferable to apply cleaning (etching) using the above-described batch cleaning machine and SC1 solution.
- the surface of the SOI layer after the thinning process is removed by removing the thermal oxide film formed on the surface of the SOI layer before the thinning process and adjusting the film thickness by etching.
- An SOI wafer with good inner film thickness uniformity can be manufactured.
- the method for manufacturing an SOI wafer having first and second thinning steps for adjusting the SOI film thickness of the SOI wafer on which the SOI layer is formed (C0) performing a heat treatment in an oxidizing gas atmosphere to form a thermal oxide film on the surface of the SOI layer; (C1) a step of measuring the SOI film thickness of the SOI wafer on which the thermal oxide film is formed in the step (C0), with the thermal oxide film attached, (C2) Based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the (C1) process and the in-plane machining allowance distribution in the first thinning process obtained in advance, the first Determining a rotational position of the SOI wafer when performing the thinning process, and rotating the SOI wafer around a central axis so as to be the rotational position; (C3) The etching amount of the SOI layer is obtained in the step (C1) by batch cleaning including the removal of the thermal oxide film on the SOI layer
- the second thinning process The manufacturing method of the SOI wafer containing this
- the first thin film forming process based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the (C1) process and the in-plane machining allowance distribution in the first thin film forming process obtained in advance, the first thin film forming process
- the rotational position of the SOI wafer at the time of performing is determined, and the SOI wafer is rotated around the central axis so as to be the determined rotational position (FIG. 4 (C2)).
- the etching amount of the SOI layer obtained in the step (C1) is obtained by batch cleaning including removal of the thermal oxide film on the surface of the SOI layer of the SOI wafer rotated in the step (C2) and etching of the SOI layer.
- the SOI layer is thinned so as to be thicker than the final target value (first thinning step; FIG. 4 (C3)).
- the SOI film thickness of the SOI wafer after the first thinning process is measured (FIG. 4 (C4)).
- the second thinning step The rotational position of the SOI wafer at the time of performing is determined, and the SOI wafer is rotated around the central axis so as to be the rotational position (FIG. 4 (C5)).
- the SOI layer is controlled while the etching amount of the SOI layer is controlled in accordance with the SOI film thickness obtained in the (C4) process by cleaning including etching of the SOI layer of the SOI wafer rotated in the (C5) process.
- the film is thinned to the final target value (second thinning process; FIG. 4 (C6)).
- the formation of the SOI layer, the (C1) step, and the (C2) step may be performed in the same manner as the formation of the SOI layer, the (A1) step, and the (A2) step, respectively. Further, the (C0) step may be performed in the same manner as the above-described (B0) step.
- the etching amount of the SOI layer can be obtained in the (C1) step by batch cleaning including removal of the thermal oxide film on the SOI layer surface of the SOI wafer rotated in the (C2) step and etching of the SOI layer. While controlling according to the SOI film thickness (for example, in-plane average value), the SOI layer is thinned so as to be thicker than the final target value.
- the step (C3) may be performed in the same manner as the above-described step (B3). However, in the first thinning step, the film is thinned so as to be thicker than the final target value, and the final thinning step described later is performed. The film is made thin so that the target value becomes.
- step (C4) the SOI film thickness of the SOI wafer after the first thinning process is measured.
- the step (C4) may be performed in the same manner as the above step (A1).
- step (C5) based on the in-plane distribution of the SOI film thickness obtained by the film thickness measurement in the (C4) step and the in-plane machining allowance distribution in the second thinning step obtained in advance, the second The rotational position of the SOI wafer when performing the thinning process is determined, and the SOI wafer is rotated around the central axis so as to be at the rotational position.
- the step (C5) may be performed in the same manner as the above step (A2).
- the SOI film thickness (for example, in-plane average value) obtained in the step (C4) is determined by cleaning including etching of the SOI layer of the SOI wafer rotated in the step (C5). ), The SOI layer is thinned to the final target value.
- cleaning of the (C6) process similarly to the above-mentioned (A3) process, and it is especially preferable to carry out by single wafer type washing
- the SOI wafer manufacturing method of the present invention described above can be applied to various SOI wafer manufacturing methods such as a smart cut method, a SIMOX (Separation by IM planted Oxygen) method, and an rTCCP (room-temperature controlled cleave process) method. Also in this method, the in-plane film of the SOI layer after the thinning process is determined by determining the rotational position when the thinning process is performed before the thinning process and rotating the SOI wafer so as to be the determined rotational position. Thickness uniformity can be improved.
- an SOI wafer of the present invention for example, a method for removing the thermal oxide film formed on the surface of the SOI layer to reduce the thickness of the SOI layer, or a method for removing the thermal oxide film and adjusting the film thickness.
- a method of thinning an SOI layer by a two-stage thinning process an SOI wafer with excellent in-plane thickness uniformity of the SOI layer after the thinning process is controlled while controlling the film thickness of the SOI layer with high accuracy. Can be manufactured. Therefore, such a method is suitable as a method for manufacturing an FD-SOI wafer that requires extremely high SOI layer thickness uniformity.
- the manufacturing yield of an SOI wafer having a target SOI film thickness is improved, and as a result, the process cost can be reduced.
- the present invention will be specifically described using examples and comparative examples, but the present invention is not limited thereto.
- the final target value of the SOI layer was set to 12.0 nm, and thinning was performed by the first and second thinning steps.
- Example 1 First, 50 SOI wafers (diameter 300 mm) having an SOI film thickness of 150 nm prepared using an ion implantation separation method were prepared, and the SOI wafer was subjected to heat treatment under the oxidation conditions shown in Table 1 to obtain the surface of the SOI layer. A thermal oxide film was formed. Next, the thickness of the SOI layer and the thermal oxide film of the SOI wafer on which the thermal oxide film was formed was measured using an ellipsometer. The results are shown in Table 1.
- the thinnest region in the in-plane film thickness of the SOI layer After measuring the SOI film thickness, the wafer is watched by a transfer machine (outside the SOI film thickness measuring apparatus) so that is on the upper side of the cleaning tank in which the first thinning process is performed (that is, the region where the machining allowance is minimized). After rotating around 135 degrees, it was transferred to a cleaning carrier.
- the SOI layer The transfer machine (SOI film) after measuring the SOI film thickness so that the thinnest area in the in-plane film thickness is the upper side in the cleaning tank in which the second thinning process is performed (that is, the area where the machining allowance is minimized).
- SOI film The transfer machine
- batch cleaning was performed using the SC1 solution under the cleaning conditions shown in Table 1 using a batch cleaning machine (film thickness adjustment cleaning).
- film thickness adjustment cleaning based on the SOI film thickness measurement result after the first thinning process, the cleaning carrier that accommodates the SOI wafer is divided every 0.1 nm in the in-plane average value of the SOI film thickness.
- the film thickness was adjusted to a target value (12.0 nm) by changing the SC1 immersion time for film thickness adjustment cleaning for each carrier.
- SC1 was the same as that used in the first thinning process.
- Example 2 Rotation of the SOI wafer before performing the first thinning process and rotation of the SOI wafer before performing the second thinning process are not provided with a separate wafer rotation process, and the wafer rotation mechanism in the SOI film thickness measuring apparatus.
- the SOI layer was thinned by performing the same operation as in Example 1 except for the above.
- the thinnest region in the in-plane film thickness of the SOI layer performs the thinning step. It rotated so that it might become the upper side in a tank (namely, area
- Table 1 shows the experimental conditions, the SOI film thickness measurement results at each stage, and the calculated yield.
- Example 3 Rotation of the SOI wafer before performing the first thinning process and rotation of the SOI wafer before performing the second thinning process are not provided with a separate wafer rotation process, and the wafer rotation mechanism in the SOI film thickness measuring apparatus.
- the SOI layer was thinned by the same operation as in Example 1 except that the second thinning step was performed by wafer immersion type single wafer cleaning.
- the thinnest region in the in-plane film thickness of the SOI layer performs the thinning step. It rotated so that it might become the upper side in a tank (namely, area
- the target value (12.0 nm) is obtained by changing the SC1 immersion time for each wafer according to the SOI film thickness based on the SOI film thickness measurement result after the first thinning process.
- the film was made thin.
- SC1 was the same as that used in the first thinning process.
- Table 1 shows the experimental conditions, the SOI film thickness measurement results at each stage, and the calculated yield.
- Example 1 The same operation as in Example 1 is performed except that the SOI wafer before the first thinning step is rotated and the SOI wafer is not rotated before the second thinning step, and the SOI layer is thinned. Went. Table 1 shows the experimental conditions, the SOI film thickness measurement results at each stage, and the calculated yield.
- the SOI wafer manufacturing method of the present invention can manufacture an SOI wafer with excellent in-plane film thickness uniformity of the SOI layer after the thinning process for adjusting the SOI film thickness. .
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.
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Abstract
Description
また酸化膜の形成と除去及びエッチングによる上記2段階の薄膜化工程において、工程を短縮する方法として、酸化後に酸化膜が付いたままSOI層の膜厚を測定し、測定したSOI層の膜厚をもとに、酸化膜除去及びエッチング、更には洗浄工程を洗浄の同一バッチ処理で行う方法が提案されている。
また、酸化膜の形成と除去及びバッチ式洗浄機による薄膜化に加えて、枚葉式のエッチング装置を用いてSOI層の薄膜化を制御する方法も提案されている(特許文献2)。
(A1)前記SOI層が形成されたSOIウェーハの前記薄膜化工程前のSOI膜厚を測定する工程、
(A2)前記(A1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記薄膜化工程での面内取り代分布に基づいて、前記薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(A3)前記(A2)工程で回転させたSOIウェーハのSOI層を薄膜化する工程、
を含むSOIウェーハの製造方法を提供する。
(B0)酸化性ガス雰囲気下で熱処理を行って前記SOI層の表面に熱酸化膜を形成する工程、
(B1)前記(B0)工程で熱酸化膜が形成されたSOIウェーハのSOI膜厚を、前記熱酸化膜付きのまま測定する工程、
(B2)前記(B1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記薄膜化工程での面内取り代分布に基づいて、前記薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(B3)前記(B2)工程で回転させたSOIウェーハのSOI層表面の熱酸化膜除去及び前記SOI層のエッチングを含むバッチ式洗浄によって、前記SOI層のエッチング量を前記(B1)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を薄膜化する工程、
を含むSOIウェーハの製造方法を提供する。
(C0)酸化性ガス雰囲気下で熱処理を行って前記SOI層の表面に熱酸化膜を形成する工程、
(C1)前記(C0)工程で熱酸化膜が形成されたSOIウェーハのSOI膜厚を、前記熱酸化膜付きのまま測定する工程、
(C2)前記(C1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記第一の薄膜化工程での面内取り代分布に基づいて、前記第一の薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、
(C3)前記(C2)工程で回転させたSOIウェーハのSOI層表面の熱酸化膜除去及び前記SOI層のエッチングを含むバッチ式洗浄によって、前記SOI層のエッチング量を前記(C1)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を最終のターゲット値より厚くなるように薄膜化する第一の薄膜化工程、
(C4)前記第一の薄膜化工程後のSOIウェーハのSOI膜厚を測定する工程、
(C5)前記(C4)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記第二の薄膜化工程での面内取り代分布に基づいて、前記第二の薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(C6)前記(C5)工程で回転させたSOIウェーハのSOI層のエッチングを含む洗浄によって、前記SOI層のエッチング量を前記(C4)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を最終のターゲット値となるように薄膜化する第二の薄膜化工程、
を含むSOIウェーハの製造方法を提供する。
(A1)前記SOI層が形成されたSOIウェーハの前記薄膜化工程前のSOI膜厚を測定する工程、
(A2)前記(A1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記薄膜化工程での面内取り代分布に基づいて、前記薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(A3)前記(A2)工程で回転させたSOIウェーハのSOI層を薄膜化する工程、
を含むSOIウェーハの製造方法である。
[SOI層の形成]
本発明において、SOI層の形成方法は特に限定されないが、例えば、イオンの注入により形成された微小気泡層を有するボンドウェーハと支持基板となるベースウェーハとを接合する工程と、微小気泡層を境界としてボンドウェーハを剥離してベースウェーハ上に薄膜を形成する工程とを有するイオン注入剥離法によって行うことが好ましい。イオン注入剥離法であれば、極薄で比較的面内膜厚分布の小さいSOI層が形成されたSOIウェーハが得られる。
(A1)工程では、SOI層が形成されたSOIウェーハのSOI膜厚を調整する薄膜化工程前のSOI膜厚を測定する。薄膜化工程前のSOI膜厚測定は、特に限定されず、公知の方法で行えばよい。
(A2)工程では、(A1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた薄膜化工程での面内取り代分布に基づいて、薄膜化工程を行う際のSOIウェーハの回転位置を決定し、決定した回転位置になるようにSOIウェーハを中心軸まわりに回転させる。
膜厚測定により得られたSOI膜厚の面内分布の最大値を示す領域と、予め求めた薄膜化工程での面内取り代分布の最大値を示す領域とが一致する位置を回転位置に決定する。
(基準2)
膜厚測定により得られたSOI膜厚の面内分布の最小値を示す領域と、予め求めた薄膜化工程での面内取り代分布の最小値を示す領域とが一致する位置を回転位置に決定する。
(基準3)
膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた薄膜化工程での面内取り代分布をもとに、回転位置を所定の角度ずつ変えた場合の薄膜化工程後のSOI膜厚の面内分布をそれぞれ計算し、該計算した薄膜化工程後のSOI膜厚の面内最大値と面内最小値の差が最小となる位置を回転位置に決定する。
(A3)工程では、(A2)工程で回転させたSOIウェーハのSOI層を薄膜化する。SOI膜厚を調整するSOI層の薄膜化の方法としては、バッチ式洗浄機を用いた洗浄(エッチング)による薄膜化を適用することが効果的であるが、これに限定されることなく、所望の取り代などに応じて、枚葉式洗浄機を用いた洗浄(エッチング)、犠牲酸化処理(バッチ処理、枚葉処理)、ガス(HCl等)によるガスエッチング、ドライエッチング、ウェットエッチング、水素やアルゴン等の還元性雰囲気熱処理によるSOI層の減厚を伴う平坦化処理等の種々の薄膜化方法を適用することができる。
薄膜化工程後のSOI膜厚分布を測定すると、図2(d)のようにSOI膜厚の平均値は12.0nm、面内膜厚分布(膜厚Range)は0.56nmとなっており、このことから図1のようなフローで薄膜化工程を行うことで、薄膜化工程前に比べて面内膜厚分布を改善させることができ、薄膜化工程後の面内膜厚均一性が良好なSOIウェーハを製造できることが分かる。
(B0)酸化性ガス雰囲気下で熱処理を行って前記SOI層の表面に熱酸化膜を形成する工程、
(B1)前記(B0)工程で熱酸化膜が形成されたSOIウェーハのSOI膜厚を、前記熱酸化膜付きのまま測定する工程、
(B2)前記(B1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記薄膜化工程での面内取り代分布に基づいて、前記薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(B3)前記(B2)工程で回転させたSOIウェーハのSOI層表面の熱酸化膜除去及び前記SOI層のエッチングを含むバッチ式洗浄によって、前記SOI層のエッチング量を前記(B1)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を薄膜化する工程、
を含むSOIウェーハの製造方法を提供する。
本発明において、熱酸化膜の形成は酸化性ガス雰囲気下で熱処理を行う方法であれば特に限定されず、公知の方法で行うことができる。
(B3)工程では、(B2)工程で回転させたSOIウェーハのSOI層表面の熱酸化膜除去及びSOI層のエッチングを含むバッチ式洗浄によって、SOI層のエッチング量を(B1)工程で得られたSOI膜厚(例えば、面内平均値)に応じて制御しながら、SOI層を薄膜化する。SOI層のエッチングを含むバッチ式洗浄による薄膜化の具体的な方法は、特に限定されないが、上述のバッチ式洗浄機とSC1溶液を用いた洗浄(エッチング)を適用することが好ましい。
(C0)酸化性ガス雰囲気下で熱処理を行って前記SOI層の表面に熱酸化膜を形成する工程、
(C1)前記(C0)工程で熱酸化膜が形成されたSOIウェーハのSOI膜厚を、前記熱酸化膜付きのまま測定する工程、
(C2)前記(C1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記第一の薄膜化工程での面内取り代分布に基づいて、前記第一の薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、
(C3)前記(C2)工程で回転させたSOIウェーハのSOI層表面の熱酸化膜除去及び前記SOI層のエッチングを含むバッチ式洗浄によって、前記SOI層のエッチング量を前記(C1)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を最終のターゲット値より厚くなるように薄膜化する第一の薄膜化工程、
(C4)前記第一の薄膜化工程後のSOIウェーハのSOI膜厚を測定する工程、
(C5)前記(C4)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記第二の薄膜化工程での面内取り代分布に基づいて、前記第二の薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(C6)前記(C5)工程で回転させたSOIウェーハのSOI層のエッチングを含む洗浄によって、前記SOI層のエッチング量を前記(C4)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を最終のターゲット値となるように薄膜化する第二の薄膜化工程、
を含むSOIウェーハの製造方法を提供する。
(C3)工程では、(C2)工程で回転させたSOIウェーハのSOI層表面の熱酸化膜除去及びSOI層のエッチングを含むバッチ式洗浄によって、SOI層のエッチング量を(C1)工程で得られたSOI膜厚(例えば、面内平均値)に応じて制御しながら、SOI層を最終のターゲット値より厚くなるように薄膜化する。(C3)工程は、上述の(B3)工程と同様にして行えばよいが、第一の薄膜化工程では最終のターゲット値より厚くなるように薄膜化し、後述の第二の薄膜化工程で最終のターゲット値となるように薄膜化する。
(C4)工程では、第一の薄膜化工程後のSOIウェーハのSOI膜厚を測定する。(C4)工程は、上述の(A1)工程と同様に行えばよい。
(C5)工程では、(C4)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた第二の薄膜化工程での面内取り代分布に基づいて、第二の薄膜化工程を行う際のSOIウェーハの回転位置を決定し、該回転位置になるようにSOIウェーハを中心軸まわりに回転させる。(C5)工程は、上述の(A2)工程と同様に行えばよい。
(C6)工程では、(C5)工程で回転させたSOIウェーハのSOI層のエッチングを含む洗浄によって、SOI層のエッチング量を(C4)工程で得られたSOI膜厚(例えば、面内平均値)に応じて制御しながら、SOI層を最終のターゲット値となるように薄膜化する。なお、(C6)工程の洗浄は、上述の(A3)工程と同様にして行えばよく、特に枚葉式洗浄で行うことが好ましい。
まず、イオン注入剥離法を用いて作製されたSOI膜厚150nmのSOIウェーハ(直径300mm)を50枚用意し、このSOIウェーハに対して表1に示す酸化条件で熱処理を行ってSOI層の表面に熱酸化膜を形成した。次に、エリプソメーターを用いて、熱酸化膜を形成したSOIウェーハのSOI層と熱酸化膜の膜厚を測定した。結果を表1に示す。
その後、第一の薄膜化工程後のSOI膜厚の測定を行った。結果を表1に示す。
第一の薄膜化工程を行う前のSOIウェーハの回転、及び第二の薄膜化工程を行う前のSOIウェーハの回転を、別途ウェーハの回転工程を設けずSOI膜厚測定装置内のウェーハ回転機構で行う以外は実施例1と同様の操作を行い、SOI層の薄膜化を行った。なお、第一の薄膜化工程及び第二の薄膜化工程を行う前のSOIウェーハの回転では、実施例1と同様に、SOI層の面内膜厚で最も薄い領域が薄膜化工程を行う洗浄槽内の上側(即ち、取り代が最小となる領域)になるように回転させた。
実験条件、各段階でのSOI膜厚測定結果、及び算出した歩留を表1に示す。
第一の薄膜化工程を行う前のSOIウェーハの回転、及び第二の薄膜化工程を行う前のSOIウェーハの回転を、別途ウェーハの回転工程を設けずSOI膜厚測定装置内のウェーハ回転機構で行い、また第二の薄膜化工程をウェーハ浸漬型の枚葉式洗浄で行う以外は実施例1と同様の操作を行い、SOI層の薄膜化を行った。なお、第一の薄膜化工程及び第二の薄膜化工程を行う前のSOIウェーハの回転では、実施例1と同様に、SOI層の面内膜厚で最も薄い領域が薄膜化工程を行う洗浄槽内の上側(即ち、取り代が最小となる領域)になるように回転させた。
また、ウェーハ浸漬型の枚葉式洗浄では、第一の薄膜化工程後のSOI膜厚測定結果に基づき、SOI膜厚に応じてウェーハ毎にSC1浸漬時間を変えてターゲット値(12.0nm)まで薄膜化を行った。なお、SC1は第一の薄膜化工程と同様のものを使用した。
実験条件、各段階でのSOI膜厚測定結果、及び算出した歩留を表1に示す。
第一の薄膜化工程を行う前のSOIウェーハの回転、及び第二の薄膜化工程を行う前のSOIウェーハの回転を行わない以外は実施例1と同様の操作を行い、SOI層の薄膜化を行った。実験条件、各段階でのSOI膜厚測定結果、及び算出した歩留を表1に示す。
また、膜厚Rangeが改善した結果、SOI膜厚の規格(12.0nm±0.5nm)に対する製造歩留が向上した。
Claims (10)
- SOI層が形成されたSOIウェーハのSOI膜厚を調整する薄膜化工程を有するSOIウェーハの製造方法において、
(A1)前記SOI層が形成されたSOIウェーハの前記薄膜化工程前のSOI膜厚を測定する工程、
(A2)前記(A1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記薄膜化工程での面内取り代分布に基づいて、前記薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(A3)前記(A2)工程で回転させたSOIウェーハのSOI層を薄膜化する工程、
を含むことを特徴とするSOIウェーハの製造方法。 - SOI層が形成されたSOIウェーハのSOI膜厚を調整する薄膜化工程を有するSOIウェーハの製造方法において、
(B0)酸化性ガス雰囲気下で熱処理を行って前記SOI層の表面に熱酸化膜を形成する工程、
(B1)前記(B0)工程で熱酸化膜が形成されたSOIウェーハのSOI膜厚を、前記熱酸化膜付きのまま測定する工程、
(B2)前記(B1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記薄膜化工程での面内取り代分布に基づいて、前記薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(B3)前記(B2)工程で回転させたSOIウェーハのSOI層表面の熱酸化膜除去及び前記SOI層のエッチングを含むバッチ式洗浄によって、前記SOI層のエッチング量を前記(B1)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を薄膜化する工程、
を含むことを特徴とするSOIウェーハの製造方法。 - SOI層が形成されたSOIウェーハのSOI膜厚を調整する第一と第二の薄膜化工程を有するSOIウェーハの製造方法において、
(C0)酸化性ガス雰囲気下で熱処理を行って前記SOI層の表面に熱酸化膜を形成する工程、
(C1)前記(C0)工程で熱酸化膜が形成されたSOIウェーハのSOI膜厚を、前記熱酸化膜付きのまま測定する工程、
(C2)前記(C1)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記第一の薄膜化工程での面内取り代分布に基づいて、前記第一の薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、
(C3)前記(C2)工程で回転させたSOIウェーハのSOI層表面の熱酸化膜除去及び前記SOI層のエッチングを含むバッチ式洗浄によって、前記SOI層のエッチング量を前記(C1)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を最終のターゲット値より厚くなるように薄膜化する第一の薄膜化工程、
(C4)前記第一の薄膜化工程後のSOIウェーハのSOI膜厚を測定する工程、
(C5)前記(C4)工程の膜厚測定により得られたSOI膜厚の面内分布、及び予め求めた前記第二の薄膜化工程での面内取り代分布に基づいて、前記第二の薄膜化工程を行う際の前記SOIウェーハの回転位置を決定し、該回転位置になるように前記SOIウェーハを中心軸まわりに回転させる工程、及び
(C6)前記(C5)工程で回転させたSOIウェーハのSOI層のエッチングを含む洗浄によって、前記SOI層のエッチング量を前記(C4)工程で得られたSOI膜厚に応じて制御しながら、前記SOI層を最終のターゲット値となるように薄膜化する第二の薄膜化工程、
を含むことを特徴とするSOIウェーハの製造方法。 - 前記(C6)工程の洗浄を、枚葉式洗浄で行うことを特徴とする請求項3に記載のSOIウェーハの製造方法。
- 前記回転位置の決定を、前記膜厚測定により得られたSOI膜厚の面内分布の最大値を示す領域と、前記予め求めた薄膜化工程での面内取り代分布の最大値を示す領域とが一致する位置に決定することを特徴とする請求項1から請求項4のいずれか一項に記載のSOIウェーハの製造方法。
- 前記回転位置の決定を、前記膜厚測定により得られたSOI膜厚の面内分布の最小値を示す領域と、前記予め求めた薄膜化工程での面内取り代分布の最小値を示す領域とが一致する位置に決定することを特徴とする請求項1から請求項4のいずれか一項に記載のSOIウェーハの製造方法。
- 前記回転位置の決定を、前記膜厚測定により得られたSOI膜厚の面内分布、及び前記予め求めた薄膜化工程での面内取り代分布をもとに、前記回転位置を所定の角度ずつ変えた場合の薄膜化工程後のSOI膜厚の面内分布をそれぞれ計算し、該計算した薄膜化工程後のSOI膜厚の面内最大値と面内最小値の差が最小となる位置に決定することを特徴とする請求項1から請求項4のいずれか一項に記載のSOIウェーハの製造方法。
- 前記薄膜化工程前のSOI膜厚を測定する工程及びその後に行う前記SOIウェーハを回転させる工程を、同一の装置内で行うことを特徴とする請求項1から請求項7のいずれか一項に記載のSOIウェーハの製造方法。
- 前記SOI層の形成を、少なくとも、イオンの注入により形成された微小気泡層を有するボンドウェーハと支持基板となるベースウェーハとを接合する工程と、前記微小気泡層を境界として前記ボンドウェーハを剥離して前記ベースウェーハ上に薄膜を形成する工程とを有するイオン注入剥離法によって行うことを特徴とする請求項1から請求項8のいずれか一項に記載のSOIウェーハの製造方法。
- 前記薄膜化工程を、SC1溶液に浸漬することによって行うことを特徴とする請求項1から請求項9のいずれか一項に記載のSOIウェーハの製造方法。
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KR1020177006584A KR102259162B1 (ko) | 2014-09-24 | 2015-08-28 | Soi 웨이퍼의 제조방법 |
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JP6354363B2 (ja) * | 2014-06-12 | 2018-07-11 | 富士通セミコンダクター株式会社 | 半導体装置の製造方法 |
US20180033609A1 (en) * | 2016-07-28 | 2018-02-01 | QMAT, Inc. | Removal of non-cleaved/non-transferred material from donor substrate |
JP6747386B2 (ja) | 2017-06-23 | 2020-08-26 | 信越半導体株式会社 | Soiウェーハの製造方法 |
US10985028B1 (en) * | 2019-10-18 | 2021-04-20 | Taiwan Semiconductor Manufacturing Co., Ltd. | Semiconductor devices and methods of manufacturing |
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TWI640033B (zh) | 2018-11-01 |
CN106663597A (zh) | 2017-05-10 |
EP3200219A1 (en) | 2017-08-02 |
KR20170058924A (ko) | 2017-05-29 |
TW201624531A (zh) | 2016-07-01 |
EP3200219B1 (en) | 2022-04-27 |
CN106663597B (zh) | 2019-05-17 |
JP2016066692A (ja) | 2016-04-28 |
KR102259162B1 (ko) | 2021-06-01 |
JP6086105B2 (ja) | 2017-03-01 |
US20170287697A1 (en) | 2017-10-05 |
EP3200219A4 (en) | 2018-06-27 |
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US10115580B2 (en) | 2018-10-30 |
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