WO2016199329A1 - 貼り合わせsoiウェーハの製造方法 - Google Patents
貼り合わせsoiウェーハの製造方法 Download PDFInfo
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- WO2016199329A1 WO2016199329A1 PCT/JP2016/001417 JP2016001417W WO2016199329A1 WO 2016199329 A1 WO2016199329 A1 WO 2016199329A1 JP 2016001417 W JP2016001417 W JP 2016001417W WO 2016199329 A1 WO2016199329 A1 WO 2016199329A1
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- H—ELECTRICITY
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- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/19—Preparing inhomogeneous wafers
- H10P90/1904—Preparing vertically inhomogeneous wafers
- H10P90/1906—Preparing SOI wafers
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- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/19—Preparing inhomogeneous wafers
- H10P90/1904—Preparing vertically inhomogeneous wafers
- H10P90/1906—Preparing SOI wafers
- H10P90/1914—Preparing SOI wafers using bonding
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/34—Deposited materials, e.g. layers
- H10P14/3402—Deposited materials, e.g. layers characterised by the chemical composition
- H10P14/3404—Deposited materials, e.g. layers characterised by the chemical composition being Group IVA materials
- H10P14/3411—Silicon, silicon germanium or germanium
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- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/34—Deposited materials, e.g. layers
- H10P14/3451—Structure
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- H10P36/00—Gettering within semiconductor bodies
- H10P36/03—Gettering within semiconductor bodies within silicon bodies
- H10P36/07—Gettering within semiconductor bodies within silicon bodies of silicon-on-insulator structures
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- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/19—Preparing inhomogeneous wafers
- H10P90/1904—Preparing vertically inhomogeneous wafers
- H10P90/1906—Preparing SOI wafers
- H10P90/1914—Preparing SOI wafers using bonding
- H10P90/1916—Preparing SOI wafers using bonding with separation or delamination along an ion implanted layer, e.g. Smart-cut
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/19—Preparing inhomogeneous wafers
- H10P90/1904—Preparing vertically inhomogeneous wafers
- H10P90/1906—Preparing SOI wafers
- H10P90/1914—Preparing SOI wafers using bonding
- H10P90/1918—Preparing SOI wafers using bonding including charge trapping layers, e.g. polycrystalline materials
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/06—Planarisation of inorganic insulating materials
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- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/90—Thermal treatments, e.g. annealing or sintering
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- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W10/00—Isolation regions in semiconductor bodies between components of integrated devices
- H10W10/10—Isolation regions comprising dielectric materials
- H10W10/181—Semiconductor-on-insulator [SOI] isolation regions, e.g. buried oxide regions of SOI wafers
Definitions
- the present invention relates to a method for manufacturing a bonded SOI wafer.
- Patent Document 1 describes that a polycrystalline silicon layer or an amorphous silicon layer as a carrier trap layer is formed at the interface between a BOX layer and a base wafer.
- Patent Document 2 also describes that a polycrystalline layer as a carrier trap layer is formed at the interface between the BOX layer and the base wafer.
- Patent Document 3 does not describe the formation of a polycrystalline silicon layer or an amorphous silicon layer as a carrier trap layer, but increases the surface roughness of the base wafer surface to be bonded to the bond wafer. By doing so, it is described that the same effect as the carrier trap layer is obtained.
- Patent Document 4 relates to a method of manufacturing a base wafer for manufacturing an SOI wafer compatible with an RF device.
- a dielectric layer is formed on a silicon substrate having a high resistivity higher than 500 ⁇ cm, and a multi-layer is formed on the dielectric layer. It is described that when the crystalline silicon layer is formed, it is deposited at a temperature of 900 ° C. or lower.
- Patent Document 5 a dielectric material layer different from a natural oxide layer is formed with a thickness of 0.5 to 10 nm on a silicon substrate having a high resistivity larger than 500 ⁇ cm in order to manufacture an SOI wafer for RF devices. After that, it is described that a polycrystalline silicon layer is formed.
- Patent Documents 1-3 discloses or suggests a technique for preventing the single crystallization from proceeding even if the heat treatment is performed after the deposition of the polycrystalline silicon layer.
- Patent Documents 4 and 5 describe that a dielectric layer is formed between a polycrystalline silicon layer and a base wafer in order to suppress single crystallization by heat treatment after the deposition of the polycrystalline silicon layer.
- the deposition temperature of the polycrystalline silicon layer Patent Document 4 only describes that it is 900 ° C. or lower.
- the reason for forming the polycrystalline silicon layer at such a low temperature is to prevent the dielectric layer from disappearing at the time of depositing the polycrystalline silicon at a high temperature and to surely suppress the single crystallization of the polycrystalline silicon layer. It is.
- the deposition temperature of the polycrystalline silicon layer is lowered, there is a problem that a sufficient deposition rate cannot be obtained, the throughput of the polycrystalline silicon layer deposition process is lowered, and the manufacturing cost is increased. all right.
- the present invention has been made in view of the above problems, and deposits a polycrystalline silicon layer so that single crystallization does not proceed even if a heat treatment step of an SOI wafer manufacturing step or a heat treatment step of a device manufacturing step is performed.
- An object of the present invention is to provide an SOI wafer manufacturing method that can improve the throughput of the polycrystalline silicon layer deposition process.
- the present invention is a method of manufacturing a bonded SOI wafer by bonding a bond wafer made of silicon single crystal and a base wafer through an insulating film, and includes at least the base A step of depositing a polycrystalline silicon layer on the bonding surface side of the wafer, a step of polishing the surface of the polycrystalline silicon layer, a step of forming the insulating film on the bonding surface of the bond wafer, and the insulating film A step of bonding the polished surface of the polycrystalline silicon layer of the base wafer and the bond wafer through a step, and a step of forming a SOI layer by thinning the bonded bond wafer, the base wafer Using a silicon single crystal wafer having a resistivity of 100 ⁇ ⁇ cm or more and depositing the polycrystalline silicon layer, The method further includes forming an oxide film in a thickness of 10 nm or more and 30 nm or less in advance on a surface of the base wafer on which the polycrystalline silicon layer
- the formation of the polycrystalline silicon layer is performed at 1050 ° C. or more and 1200 ° C. Even when performed at the following high temperature, the oxide film disappears during the deposition of the polycrystalline silicon layer, or the layer state can be maintained without being scattered in a spherical shape, so during the deposition of the polycrystalline silicon layer, After the deposition, single crystallization due to the heat treatment process of the SOI wafer manufacturing process or the heat treatment process of the device manufacturing process can be suppressed.
- the deposition temperature of the polycrystalline silicon layer can be sufficiently increased by setting the deposition temperature of the polycrystalline silicon layer to 1050 ° C. or higher, for example, using a single-wafer atmospheric pressure epitaxial growth apparatus Even when a polycrystalline silicon layer is deposited, throughput can be improved and manufacturing cost can be reduced. Moreover, the occurrence of slip dislocation can be prevented by setting the deposition temperature to 1200 ° C. or lower.
- heat treatment is performed at a temperature of 1050 ° C. to 1200 ° C. for 1 second to 60 seconds in a hydrogen-containing atmosphere. Is preferred.
- impurities that become dopants are attached in minute amounts during or after the oxide film formation, and these minute amounts of impurities pass through the oxide film.
- the high frequency characteristics may be deteriorated by diffusion to the base wafer.
- a heat treatment is performed for 1 second to 60 seconds at a temperature of 1050 ° C. to 1200 ° C. in a hydrogen-containing atmosphere to remove these impurities.
- the diffusion of impurities as dopants into the base wafer can be prevented, thereby reliably preventing the deterioration of the high frequency characteristics.
- the heat treatment under the hydrogen-containing atmosphere and the deposition of the polycrystalline silicon layer are continuously performed with the same apparatus.
- the throughput can be improved more effectively, and the manufacturing cost can be more effectively improved. Can be reduced.
- the polycrystalline silicon layer is formed so that the single crystallization does not proceed even through the heat treatment process of the SOI wafer manufacturing process and the heat treatment process of the device manufacturing process.
- the throughput of the polycrystalline silicon layer deposition process can be improved, and the manufacturing cost can be reduced.
- Patent Documents 4 and 5 describe that a dielectric layer is formed between a polycrystalline silicon layer and a base wafer in order to suppress single crystallization by heat treatment after the deposition of the polycrystalline silicon layer.
- a dielectric layer is formed between a polycrystalline silicon layer and a base wafer in order to suppress single crystallization by heat treatment after the deposition of the polycrystalline silicon layer.
- the present inventors can deposit a polycrystalline silicon layer so that single crystallization does not proceed even if a heat treatment process in an SOI wafer manufacturing process or a heat treatment process in a device manufacturing process is performed.
- the present inventors have made extensive studies on a method for manufacturing an SOI wafer that can improve the throughput of the deposition process. As a result, an oxide film having a thickness of 10 nm to 30 nm is formed in advance on the surface of the base wafer on which the polycrystalline silicon layer is deposited, and the polycrystalline silicon layer is deposited at a temperature of 1050 ° C. to 1200 ° C.
- a bond wafer 10 made of a silicon single crystal is prepared (see step S11 in FIG. 1, FIG. 2A).
- the bond wafer 10 becomes a buried insulating film layer (in the case of a buried oxide film layer, also referred to as a BOX layer) (a buried insulating film layer 16 in FIG. 2I described later).
- An insulating film (for example, an oxide film) 13 is grown (see step S12 in FIG. 1, FIG. 2B).
- an ion implantation layer 17 is formed in the bond wafer 10 by implanting at least one kind of hydrogen ion and rare gas ion from above the insulating film 13 by an ion implanter (FIG. 1). Step S13, see FIG. 2 (c)). At this time, the ion implantation acceleration voltage is selected so that the target thickness of the SOI layer (the SOI layer 15 in FIG. 2I described later) can be obtained.
- step S14 in FIG. 1 In order to remove particles on the bonding surface of the bond wafer 10, cleaning before bonding is performed (see step S14 in FIG. 1).
- a base wafer 11 made of silicon single crystal is prepared (see step S21 in FIG. 1, FIG. 2D).
- an oxide film (base oxide film) 20 is formed on the base wafer 11 (see step S22 in FIG. 1, FIG. 2E).
- the thickness of the oxide film 20 to be formed is 10 nm or more and 30 nm or less. In order to more reliably prevent the oxide film from disappearing or being scattered in a spherical shape during the deposition of the polycrystalline silicon layer, it is preferably thicker than 10 nm, for example, 15 nm or more.
- a method for forming an oxide film having such a thickness is not particularly limited, but a method of performing thermal oxidation at a low temperature for a short time in an oxidizing atmosphere using a general batch type heat treatment furnace, or a rapid A uniform oxide film can be formed by using a method of performing an oxidation heat treatment (RTO) using a heating / rapid cooling apparatus (RTA apparatus).
- RTO oxidation heat treatment
- RTA apparatus heating / rapid cooling apparatus
- the polycrystalline silicon layer 12 is deposited on the oxide film (base oxide film) 20 (see step S23 in FIG. 1, FIG. 2F).
- the deposition temperature is set to 1050 ° C. or more and 1200 ° C. or less.
- 100% H 2 is usually used as the atmospheric gas during the temperature rise to the deposition temperature. Since the deposition temperature is 1050 ° C. or more and 1200 ° C. or less, even if the heat treatment process of the SOI wafer manufacturing process and the heat treatment process of the device manufacturing process are relatively high temperature (for example, about 1000 to 1200 ° C.), Grain boundary growth is suppressed, and the effect as a carrier trap layer can be maintained. Further, the effect of removing impurities adhering to the surface of the oxide film 20 is also obtained by the hydrogen-containing atmosphere during the temperature rise.
- the deposition temperature is not lower than 1050 ° C. and not higher than 1200 ° C.
- the polycrystalline silicon layer 12 is deposited at high speed at normal pressure using trichlorosilane as a source gas using a general CVD apparatus for epitaxial growth. be able to.
- the deposition temperature is preferably 1100 ° C. or higher.
- the hydrogen is used at a predetermined temperature selected from a temperature range of 1050 ° C. or higher and 1200 ° C. or lower for a predetermined time of 1 second or longer and 60 seconds or shorter. It is preferable that the surface of the oxide film is slightly etched by heat treatment to sufficiently remove impurities attached to the surface. Thereby, the diffusion of impurities as dopants into the base wafer can be prevented, and the deterioration of the high frequency characteristics can be surely prevented.
- the heat treatment in the hydrogen-containing atmosphere can be performed by continuously performing the heat treatment in the hydrogen-containing atmosphere and the deposition of the polycrystalline silicon layer with the same apparatus using a CVD apparatus for depositing the polycrystalline silicon layer. Since productivity improves, it is preferable. However, it is also possible to perform the heat treatment and the deposition as separate processes using separate apparatuses.
- the surface of the polycrystalline silicon layer 12 deposited on the base wafer 11 is flattened by polishing (see step S24 in FIG. 1, FIG. 2G). Since the surface roughness of the polycrystalline silicon layer 12 deposited at a temperature of 1050 ° C. or higher and 1200 ° C. or lower is large and difficult to bond to the bond wafer as it is, the surface of the polycrystalline silicon layer 12 is flattened by polishing. There is a need.
- step S25 in FIG. 1 In order to remove particles on the surface of the polished polycrystalline silicon layer 12, cleaning before bonding is performed (see step S25 in FIG. 1). Note that steps S11 to S14 in FIG. 1 and steps S21 to S25 in FIG. 1 can be performed in parallel.
- the base wafer 11 on which the oxide film 20 and the polycrystalline silicon layer 12 are formed is insulated so that the surface of the base wafer 11 on which the polycrystalline silicon layer 12 is formed and the ion implantation surface of the bond wafer 10 are in contact with each other.
- the bonded wafer 10 on which the film 13 is formed is adhered and bonded (see step S31 in FIG. 1, FIG. 2H).
- a heat treatment for generating a microbubble layer on the ion implantation layer 17 is applied to the bonded wafer, and the generated microbubble layer is peeled off, and the embedded insulating film layer 16 and the SOI are formed on the base wafer 11.
- the bonded wafer 14 on which the layer 15 is formed is produced (see step S32 in FIG. 1, FIG. 2 (i)).
- the release wafer 18 having the release surface 19 is derived.
- a bonded SOI wafer can be manufactured as described above.
- the thinning of the bond wafer 10 is exemplified by the formation of the ion implantation layer 17 and the peeling at the ion implantation layer 17, the present invention is not limited thereto.
- the bonding wafer 10 can be thinned by combining, for example, grinding, polishing, etching, and the like.
- an oxide film having a thickness of 10 nm or more and 30 nm or less is formed in advance between the surface of the silicon single crystal of the base wafer and the deposited polycrystalline silicon layer.
- the deposition temperature of the polycrystalline silicon layer is set to a temperature of 1050 ° C. or more and 1200 ° C. or less, the heat treatment process of the SOI wafer manufacturing process and the heat treatment process of the device manufacturing process are relatively high temperature (for example, about 1000 to 1200 ° C.).
- the grain boundary growth of the polycrystalline silicon layer is suppressed, the effect as the carrier trap layer can be maintained, and at the same time, the deposition rate of the polycrystalline silicon layer can be sufficiently increased. Even when a polycrystalline silicon layer is deposited using a single-wafer atmospheric pressure epitaxial growth apparatus, the throughput can be improved and the manufacturing cost can be reduced.
- the resistivity of the base wafer 11 is 100 ⁇ ⁇ cm or more, it can be suitably used for manufacturing a high-frequency device, more preferably 1000 ⁇ ⁇ cm or more, and particularly preferably 3000 ⁇ ⁇ cm or more.
- the upper limit of a resistivity is not specifically limited, For example, it can be set to 50000 ohm * cm.
- Example 1 A bonded SOI wafer was manufactured using the manufacturing method described in FIGS. However, the base wafer is 300 mm in diameter, crystal orientation ⁇ 100>, resistivity 1300 ⁇ ⁇ cm, p-type single crystal silicon, base oxide film formation and polycrystalline silicon layer deposition on the base wafer (trichlorosilane as a source gas) Use), BOX oxidation and hydrogen ion implantation in the bond wafer, and peeling heat treatment and bonding heat treatment after bonding were performed under the following conditions.
- Example 2 A bonded SOI wafer was produced in the same manner as in Example 1. However, the polycrystalline silicon layer was deposited at 1130 ° C., and immediately before the deposition, a heat treatment (1130 ° C., 20 seconds) in a hydrogen-containing atmosphere was performed in the same apparatus. In the same manner as in Example 1, the state of single crystallization of the polycrystalline silicon layer and the resistivity of the base wafer surface were confirmed. These results are shown in Table 1.
- Example 3 A bonded SOI wafer was produced in the same manner as in Example 1. However, the RTO processing time is adjusted so that the thickness of the base oxide film is 15 nm, the polycrystalline silicon layer is deposited at 1150 ° C., and hydrogen heat treatment (1130 ° C., 20 seconds) is performed in the same apparatus immediately before the deposition. Went. In the same manner as in Example 1, the state of single crystallization of the polycrystalline silicon layer and the resistivity of the base wafer surface were confirmed. These results are shown in Table 1.
- Example 4 A bonded SOI wafer was produced in the same manner as in Example 1. However, the RTO processing time is adjusted so that the thickness of the base oxide film is 10 nm, the polycrystalline silicon layer is deposited at 1200 ° C., and hydrogen heat treatment (1130 ° C., 20 seconds) is performed in the same apparatus immediately before the deposition. Went. In the same manner as in Example 1, the state of single crystallization of the polycrystalline silicon layer and the resistivity of the base wafer surface were confirmed. These results are shown in Table 1.
- Example 5 A bonded SOI wafer was produced in the same manner as in Example 1. However, the RTO processing time was adjusted so that the thickness of the base oxide film was 15 nm, and the polycrystalline silicon layer was deposited at 1050 ° C. In the same manner as in Example 1, the state of single crystallization of the polycrystalline silicon layer and the resistivity of the base wafer surface were confirmed. These results are shown in Table 1.
- Example 1 A bonded SOI wafer was produced in the same manner as in Example 1. However, the polycrystalline silicon layer was deposited at 900 ° C. In the same manner as in Example 1, the state of single crystallization of the polycrystalline silicon layer and the resistivity of the base wafer surface were confirmed. These results are shown in Table 1.
- Example 2 A bonded SOI wafer was produced in the same manner as in Example 4. However, the RTO processing time was adjusted so that the thickness of the base oxide film was 8 nm, and no hydrogen heat treatment was performed before the deposition of the polycrystalline silicon layer. In the same manner as in Example 4, the state of single crystallization of the polycrystalline silicon layer and the resistivity of the base wafer surface were confirmed. These results are shown in Table 1.
- Examples 1 to 5 in which the base oxide film is in the range of 10 nm or more and 30 nm or less and the stack temperature of the polycrystalline silicon layer is 1050 or more and 1200 ° C. or less are the deposition rates of the polycrystalline silicon layer. Can be deposited at a sufficiently high speed of 2.9 ⁇ m / min or more, and there has been no problem of single crystallizing the polycrystalline silicon layer or reducing the resistivity of the base wafer surface. On the other hand, in Comparative Example 1 in which the deposition temperature of the polycrystalline silicon layer was 900 ° C., the deposition rate was 0.5 ⁇ m / min, which was about 1/6 or less of Examples 1 to 5 and the throughput was greatly reduced. did.
- Example 3 A bonded SOI wafer was produced in the same manner as in Example 1. However, the base oxide film was made 40 nm by adjusting the RTO processing time. A high frequency integrated circuit device was manufactured on the SOI layer of the bonded SOI wafer manufactured in Example 1 and Comparative Example 3. As a result of measuring and comparing the second harmonic characteristics of each of the manufactured devices, it was found that the second harmonic characteristics were deteriorated in Comparative Example 3 as compared with Example 1. This is presumed to be the deterioration of the high-frequency characteristics due to the formation of the inversion layer due to the base oxide film becoming as thick as 40 nm.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.
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Abstract
Description
一方、特許文献2にも、BOX層とベースウェーハの界面に、キャリアトラップ層としての多結晶層を形成することが記載されており、更に、多結晶シリコン層の再結晶化を防止するため、多結晶シリコン層形成後の熱処理温度を制限している。
また、特許文献3には、キャリアトラップ層としての多結晶シリコン層や非晶質シリコン層を形成することは記載されていないが、ボンドウェーハと貼り合わせる側のベースウェーハ表面の表面粗さを大きくすることによって、キャリアトラップ層と同様の効果を得ることが記載されている。
しかしながら、通常の多結晶シリコン層を堆積させキャリアトラップ層を形成すると、SOIウェーハ製造工程中またはデバイス製造工程中の熱履歴によっては多結晶シリコン層がアニールされ単結晶化しキャリアトラップ層としての効果が減少してしまうという問題があった。
従って、多結晶シリコン層堆積後に熱処理を行っても単結晶化が進まないようにする必要がある。言い換えれば、SOIウェーハ製造工程の熱処理工程やデバイス製造工程の熱処理工程を通っても単結晶化が進まないようなコストが安く、効果が持続する多結晶シリコン層を堆積する必要がある。
しかしながら、上記の特許文献1-3のいずれにも、多結晶シリコン層堆積後に熱処理を行っても単結晶化が進まないようにする技術については、開示も示唆もされていない。
その一方で、多結晶シリコン層の堆積温度を低温化すると、十分な堆積速度が得られずに多結晶シリコン層堆積工程のスループットが低下し、製造コストが増大してしまうという問題があることがわかった。
さらに、多結晶シリコン層の堆積温度を1050℃以上の温度にすることで、多結晶シリコン層の堆積速度を十分に速くすることができるので、例えば、枚葉式の常圧エピタキシャル成長装置を用いて多結晶シリコン層を堆積する場合でも、スループットを向上させることができ、製造コストを低減させることができる。また、堆積温度を1200℃以下の温度とすることで、スリップ転位の発生を防止することができる。
酸化膜が形成されたベースウェーハの酸化膜表面には、酸化膜形成時や酸化膜形成後にドーパントとなる不純物が微量に付着して存在しており、この微量の不純物が、酸化膜を経由してベースウェーハへ拡散することによって、高周波特性を劣化させる場合がある。このため、多結晶シリコン層の堆積を行う前に、水素含有雰囲気下、1050℃以上、1200℃以下の温度で、1秒以上、60秒以下の熱処理を行い、これらの不純物を除去することで、ドーパントとなる不純物のベースウェーハへの拡散を防止することができ、これにより、高周波特性の劣化を確実に防止することができる。
このように水素含有雰囲気下での熱処理と、多結晶シリコン層の堆積とを同一の装置で連続的に行うことで、スループットをより効果的に向上させることができ、製造コストをより効果的に低減できる。
その結果、ベースウェーハの多結晶シリコン層を堆積する表面に予め酸化膜を10nm以上、30nm以下の厚さで形成しておき、多結晶シリコン層の堆積を1050℃以上、1200℃以下の温度で行うことで、SOIウェーハ製造工程の熱処理工程やデバイス製造工程の熱処理工程を通っても単結晶化が進まないように多結晶シリコン層を堆積することができるとともに、多結晶シリコン層堆積工程のスループットを向上させることができることを見出し、本発明を完成させた。
このような厚さの酸化膜を形成する方法としては特に限定されないが、一般的なバッチ式の熱処理炉を用いて、酸化性雰囲気中で、低温・短時間の熱酸化を行う方法や、急速加熱・急速冷却装置(RTA装置)を用いた酸化熱処理(RTO)を行う方法などを用いることによって、均一な酸化膜を形成することができる。
堆積温度が1050℃以上、1200℃以下であるので、SOIウェーハ製造工程の熱処理工程やデバイス製造工程の熱処理が比較的高温(例えば、1000~1200℃程度)であっても、多結晶シリコン層の粒界成長が抑制され、キャリアトラップ層としての効果を維持することができる。また、昇温中の水素含有雰囲気により、酸化膜20の表面に付着している不純物を除去する効果も得られる。
なお、図1のステップS11~S14と、図1のステップS21~S25とは並行してすすめることができる。
上記のようにして貼り合わせSOIウェーハを製造することができる。
ボンドウェーハ10の薄膜化を、イオン注入層17の形成と、イオン注入層17での剥離により行うことを例示したが、これに限らない。ボンドウェーハ10の薄膜化は、例えば、研削、研磨、エッチング等を組み合わせて行うこともできる。
図1、2で説明した製造方法を用いて貼り合わせSOIウェーハを作製した。ただし、ベースウェーハとして、直径300mm、結晶方位<100>、抵抗率1300Ω・cm、p型の単結晶シリコンを用い、ベースウェーハにおけるベース酸化膜形成及び多結晶シリコン層堆積(トリクロロシランを原料ガスとして使用)、ボンドウェーハにおけるBOX酸化及び水素イオン注入、並びに、貼り合わせ後の剥離熱処理及び結合熱処理は、以下の条件で行った。
ベース酸化膜形成 :RTO(RTA装置を用いた酸化熱処理)、
酸化膜厚30nm
多結晶シリコン層堆積前水素熱処理:なし(ただし、堆積温度までの昇
温時の雰囲気は100%H2)
多結晶シリコン層堆積:1100℃ 常圧 膜厚3.0μm(研磨後2
.5μm)
BOX酸化 :1050℃ 酸化膜厚400nm
水素イオン注入 :105keV 7.5×1016/cm2
剥離熱処理 :500℃ 30分 100%Ar雰囲気
結合熱処理 :900℃パイロジェニック酸化 +
1100℃120分のArアニール
実施例1と同様にして貼り合わせSOIウェーハを作製した。ただし、多結晶シリコン層堆積は1130℃で行い、堆積の直前に、同一の装置内で水素含有雰囲気下の熱処理(1130℃、20秒)を行った。
実施例1と同様にして多結晶シリコン層の単結晶化の状況とベースウェーハ表面の抵抗率を確認した。これらの結果を表1に示す。
実施例1と同様にして貼り合わせSOIウェーハを作製した。ただし、RTOの処理時間を調整してベース酸化膜の厚さを15nmとし、多結晶シリコン層堆積は1150℃で行い、堆積の直前に、同一の装置内で水素熱処理(1130℃、20秒)を行った。
実施例1と同様にして多結晶シリコン層の単結晶化の状況とベースウェーハ表面の抵抗率を確認した。これらの結果を表1に示す。
実施例1と同様にして貼り合わせSOIウェーハを作製した。ただし、RTOの処理時間を調整してベース酸化膜の厚さを10nmとし、多結晶シリコン層堆積は1200℃で行い、堆積の直前に、同一の装置内で水素熱処理(1130℃、20秒)を行った。
実施例1と同様にして多結晶シリコン層の単結晶化の状況とベースウェーハ表面の抵抗率を確認した。これらの結果を表1に示す。
実施例1と同様にして貼り合わせSOIウェーハを作製した。ただし、RTOの処理時間を調整してベース酸化膜の厚さを15nmとし、多結晶シリコン層堆積は1050℃で行った。
実施例1と同様にして多結晶シリコン層の単結晶化の状況とベースウェーハ表面の抵抗率を確認した。これらの結果を表1に示す。
実施例1と同様にして貼り合わせSOIウェーハを作製した。ただし、多結晶シリコン層の堆積は900℃で行った。
実施例1と同様にして多結晶シリコン層の単結晶化の状況とベースウェーハ表面の抵抗率を確認した。これらの結果を表1に示す。
実施例4と同様にして貼り合わせSOIウェーハを作製した。ただし、RTOの処理時間を調整してベース酸化膜の厚さを8nmとし、多結晶シリコン層堆積前の水素熱処理は行わなかった。
実施例4と同様にして多結晶シリコン層の単結晶化の状況とベースウェーハ表面の抵抗率を確認した。これらの結果を表1に示す。
一方、多結晶シリコン層の堆積温度を900℃とした比較例1では、堆積速度が0.5μm/minであり、実施例1~5の1/6程度以下の低速となり、スループットが大幅に低下した。
また、ベース酸化膜を8nmとした比較例2では、多結晶シリコン堆積工程でベース酸化膜が消失し、多結晶シリコン層の単結晶化が発生した。また、多結晶シリコン層堆積前の水素熱処理を行わなかったことと、ベース酸化膜が消失したことの影響により、ベースウェーハ表面に抵抗率の低下が観察された。これは、ベースウェーハ中にドーパントとなる不純物が拡散したことに起因するものと推定される。
実施例1と同様にして貼り合わせSOIウェーハを作製した。ただし、RTOの処理時間を調整してベース酸化膜を40nmとした。
実施例1及び比較例3で作製した貼り合わせSOIウェーハのSOI層に高周波集積回路デバイスを製造した。製造したデバイスのそれぞれについて二次高調波特性を測定し、比較した結果、実施例1に比べ比較例3は二次高調波特性が劣化していることがわかった。これは、ベース酸化膜が40nmと厚くなったことにより反転層が形成されたことに起因した高周波特性の劣化であると推定される。
Claims (3)
- いずれもシリコン単結晶からなるボンドウェーハとベースウェーハとを絶縁膜を介して貼り合わせて貼り合わせSOIウェーハを製造する方法であって、
少なくとも、
前記ベースウェーハの貼り合わせ面側に多結晶シリコン層を堆積する工程と、
該多結晶シリコン層の表面を研磨する工程と、
前記ボンドウェーハの貼り合わせ面に前記絶縁膜を形成する工程と、
該絶縁膜を介して前記ベースウェーハの前記多結晶シリコン層の研磨面と前記ボンドウェーハを貼り合わせる工程と、
貼り合わせられた前記ボンドウェーハを薄膜化してSOI層を形成する工程と
を有し、
前記ベースウェーハとして抵抗率が100Ω・cm以上のシリコン単結晶ウェーハを用い、
前記多結晶シリコン層を堆積する工程は、前記ベースウェーハの前記多結晶シリコン層を堆積する表面に予め酸化膜を10nm以上、30nm以下の厚さで形成する段階をさらに含み、
前記多結晶シリコン層の堆積を1050℃以上、1200℃以下の温度で行うことを特徴とする貼り合わせSOIウェーハの製造方法。 - 前記酸化膜を形成後、前記多結晶シリコン層の堆積を行う前に、水素含有雰囲気下、1050℃以上、1200℃以下の温度で、1秒以上、60秒以下の熱処理を行うことを特徴とする請求項1に記載された貼り合わせSOIウェーハの製造方法。
- 前記水素含有雰囲気下での熱処理と、前記多結晶シリコン層の堆積とを、同一の装置で連続的に行うことを特徴とする請求項2に記載された貼り合わせSOIウェーハの製造方法。
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| CN110085550A (zh) * | 2018-01-26 | 2019-08-02 | 沈阳硅基科技有限公司 | 一种半导体产品用绝缘层结构及其制备方法 |
| JP6827442B2 (ja) * | 2018-06-14 | 2021-02-10 | 信越半導体株式会社 | 貼り合わせsoiウェーハの製造方法及び貼り合わせsoiウェーハ |
| CN110943066A (zh) * | 2018-09-21 | 2020-03-31 | 联华电子股份有限公司 | 具有高电阻晶片的半导体结构及高电阻晶片的接合方法 |
| FR3098642B1 (fr) * | 2019-07-12 | 2021-06-11 | Soitec Silicon On Insulator | procédé de fabrication d'une structure comprenant une couche mince reportée sur un support muni d’une couche de piégeage de charges |
| US11257902B2 (en) * | 2020-05-28 | 2022-02-22 | Taiwan Semiconductor Manufacturing Company Limited | SOI device structure for robust isolation |
| FR3129028B1 (fr) * | 2021-11-09 | 2023-11-10 | Soitec Silicon On Insulator | Procede de preparation d’un substrat support muni d’une couche de piegeage de charges |
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| EP3309819B1 (en) | 2022-05-04 |
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