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JP2017039074A - Recovery method of plasma etching gas - Google Patents

Recovery method of plasma etching gas Download PDF

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JP2017039074A
JP2017039074A JP2015161724A JP2015161724A JP2017039074A JP 2017039074 A JP2017039074 A JP 2017039074A JP 2015161724 A JP2015161724 A JP 2015161724A JP 2015161724 A JP2015161724 A JP 2015161724A JP 2017039074 A JP2017039074 A JP 2017039074A
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智隆 田渕
Tomotaka Tabuchi
智隆 田渕
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Disco Corp
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Priority to CN201610647277.2A priority patent/CN106466547A/en
Priority to KR1020160101241A priority patent/KR20170022880A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
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    • B01D39/20Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
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    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D63/02Hollow fibre modules
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    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D69/00Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/08Hollow fibre membranes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32Gas-filled discharge tubes
    • H01J37/32431Constructional details of the reactor
    • H01J37/32798Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
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    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
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    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
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    • B01D2253/1124Metal oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
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    • B01D2257/204Inorganic halogen compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2258/00Sources of waste gases
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    • B01D2258/0216Other waste gases from CVD treatment or semi-conductor manufacturing

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Abstract

PROBLEM TO BE SOLVED: To recover and reutilize gas used in plasma etching by a simple constitution.SOLUTION: Etching gas is recovered and re-utilized by a simple constitution by executing a first filtration step for filtering gas exhausted from a chamber 2 by a first filter 4 including a metal hydroxide or a metal oxide, and after the first filtration step, a second first filtration step for filtering gas passing through the first filter 4 by a second filter 6 comprising a hollow fiber membrane 60.SELECTED DRAWING: Figure 1

Description

本発明は、プラズマエッチング装置において使用されたエッチングガスを回収する方法に関する。   The present invention relates to a method for recovering an etching gas used in a plasma etching apparatus.

例えば、プラズマエッチングに用いるSF6、CF4等のフッ素系安定ガスに含まれる原子は、そのすべてが電離してエッチングに供されるわけではなく、実際にエッチングガスとして利用されるものは20%程度にすぎず、残りの80%ほどは電離しないため、エッチングに供されずに装置の外部に排出されており、不経済であるという問題がある。 For example, atoms contained in a fluorine-based stable gas such as SF 6 or CF 4 used for plasma etching are not all ionized and used for etching, and 20% are actually used as etching gas. only to the extent, as the remaining 80 percent to not ionized, are discharged out of the apparatus without being subjected to etching, there is a problem in that it is uneconomical.

そこで、CVD装置、プラズマエッチング装置等の、ガスを用いてウエーハを加工する装置には、使用済みのガスを回収して再利用可能とする機能を備えているものがある(例えば、特許文献1,2参照)。   Thus, some apparatuses that process a wafer using a gas, such as a CVD apparatus and a plasma etching apparatus, have a function of collecting used gas and making it reusable (for example, Patent Document 1). , 2).

特開2000−210527号公報JP 2000-210527 A 特開2006−073592号公報JP 2006-073592 A

しかし、使用済みガスの回収には大規模な設備が必要とされており、広い設置スペースが必要になるとともに、コスト増大の要因になっている。   However, a large-scale facility is required for collecting used gas, which requires a large installation space and increases costs.

本発明は、このような問題にかんがみなされたもので、プラズマエッチングに使用されたガスを簡易な構成によって回収して再利用できるようにすることを課題とする。   The present invention has been considered in view of such problems, and an object of the present invention is to recover and reuse the gas used for plasma etching with a simple configuration.

本発明は、プラズマエッチング装置におけるエッチングガスの回収方法であって、チャンバから排気されるガスを、水酸化メタルまたは酸化メタルを備える第1のフィルタにおいて濾過する第1の濾過工程と、第1の濾過工程後、第1のフィルタを通過したガスを、中空糸膜からなる第2のフィルタにおいて濾過する第2の濾過工程と、からなる。   The present invention is a method for recovering an etching gas in a plasma etching apparatus, wherein a first filtration step of filtering a gas exhausted from a chamber in a first filter provided with metal hydroxide or metal oxide; After the filtration step, the second filtration step of filtering the gas that has passed through the first filter in a second filter made of a hollow fiber membrane.

本発明に係るプラズマエッチングガスの回収方法は、チャンバから排気されるガスを水酸化メタルまたは酸化メタルを備える第1のフィルタにおいて濾過する第1の濾過工程と、第1の濾過工程後、第1のフィルタを通過したガスを中空糸膜からなる第2のフィルタにおいて濾過する第2の濾過工程と、からなるため、簡易な構成でエッチングガスを回収し再利用することができる。また、エッチングガスを再利用することにより、地球温暖化を防止することができる。   The plasma etching gas recovery method according to the present invention includes a first filtration step of filtering a gas exhausted from a chamber in a first filter provided with metal hydroxide or metal oxide, and a first filtration step after the first filtration step. Therefore, the etching gas can be recovered and reused with a simple structure. The second filtration step is for filtering the gas that has passed through the filter in a second filter made of a hollow fiber membrane. Moreover, global warming can be prevented by reusing the etching gas.

回収装置及びプラズマチャンバを示す模式図である。It is a schematic diagram which shows a collection | recovery apparatus and a plasma chamber.

図1に示す回収装置1は、プラズマエッチング装置内に収容されるか、またはプラズマエッチング装置に接続され、プラズマエッチング装置において使用されたガスを回収し、再利用できるガスについてはプラズマエッチング装置に戻す装置である。   The recovery apparatus 1 shown in FIG. 1 is accommodated in or connected to the plasma etching apparatus, recovers the gas used in the plasma etching apparatus, and returns the reusable gas to the plasma etching apparatus. Device.

図1に示すプラズマチャンバ2は、プラズマエッチング装置内に設けられる。プラズマチャンバ2は、被加工物が収容されて加工が行われる加工室であり、この内部には、フッ素系ガスた塩素系ガス等のプラズマ化するガスが導入される。また、プラズマチャンバ2の内部には、図示していないが、被加工物Wを保持する保持部なども収容され、保持部には加工対象のウエーハW等が保持される。また、プラズマチャンバ2の外部には、エッチングガスのプラズマ化に必要な高周波電源(不図示)なども備えている。   A plasma chamber 2 shown in FIG. 1 is provided in a plasma etching apparatus. The plasma chamber 2 is a processing chamber in which a workpiece is accommodated and processing is performed, and a gas to be converted into plasma, such as a fluorine-based gas or a chlorine-based gas, is introduced into this chamber. Although not shown, the plasma chamber 2 also contains a holding unit for holding the workpiece W, and the holding unit holds the wafer W to be processed. In addition, a high-frequency power source (not shown) necessary for turning the etching gas into plasma is also provided outside the plasma chamber 2.

プラズマチャンバ2は、排気路30を介して第1のポンプ3の入力側に接続されている。第1のポンプ3は、例えば真空ポンプであり、プラズマチャンバ2内のエッチングガスを吸引する。   The plasma chamber 2 is connected to the input side of the first pump 3 via the exhaust path 30. The first pump 3 is a vacuum pump, for example, and sucks the etching gas in the plasma chamber 2.

第1のポンプ3の出力側は、排気路31を介して第1のフィルタ4に接続されている。第1のフィルタ4には、粉末の酸化メタル又は水酸化メタルを備えている。メタルの例としては、例えば、Ca(カルシウム)、Mn(マンガン)、Mo(モリブデン)、Mg(マグネシウム)、Na(ナトリウム)が挙げられる。第1のフィルタ4では、酸化メタルと水酸化メタルとを混合させてもよい。   The output side of the first pump 3 is connected to the first filter 4 via the exhaust path 31. The first filter 4 includes powdered metal oxide or metal hydroxide. Examples of the metal include Ca (calcium), Mn (manganese), Mo (molybdenum), Mg (magnesium), and Na (sodium). In the first filter 4, metal oxide and metal hydroxide may be mixed.

第1のフィルタ4は、流路50を介して第2のポンプ5の入力側に接続されている。第2のポンプ5は、例えば加圧ポンプであり、第1のフィルタ4内で吸着されなかったガスを吸引する。   The first filter 4 is connected to the input side of the second pump 5 via the flow path 50. The second pump 5 is, for example, a pressurizing pump, and sucks the gas that has not been adsorbed in the first filter 4.

第2のポンプ5の出力側は、流路51を介して第2のフィルタ6に接続されている。第2のフィルタ6は、中空糸膜60を備えており、中空糸膜60の一端61に流路51が接続されている。一方、中空糸膜の他端62には流路70が接続されている。第2のフィルタ6の上端には、ガス排出口63が形成されている。中空糸膜60は、側面に微細な孔が多数形成されて構成されており、ガスを構成する分子の分子径の大きさに応じて、各分子を中空糸膜の外に放出したり、外に放出せずに他端62にまで導いたりすることで、特定の分子を濾過することができる。   The output side of the second pump 5 is connected to the second filter 6 via the flow path 51. The second filter 6 includes a hollow fiber membrane 60, and a flow path 51 is connected to one end 61 of the hollow fiber membrane 60. On the other hand, a flow path 70 is connected to the other end 62 of the hollow fiber membrane. A gas discharge port 63 is formed at the upper end of the second filter 6. The hollow fiber membrane 60 is formed by forming a large number of fine holes on the side surface, and depending on the molecular diameter of the molecules constituting the gas, each molecule can be released out of the hollow fiber membrane, A specific molecule can be filtered by guiding it to the other end 62 without releasing it.

第2のフィルタ6には、流路70を介して回収タンク7が接続されている。回収タンク7には、第2のフィルタ6の中空糸膜60を透過したガスが収容される。   A collection tank 7 is connected to the second filter 6 via a flow path 70. The recovery tank 7 stores gas that has passed through the hollow fiber membrane 60 of the second filter 6.

回収タンク7は、流路80を介して第3のポンプ8の入力側に接続されている。第3のポンプ8の出力側は、流路81を介してプラズマチャンバ2に接続されている。回収タンク7に回収されたガスは、第3のポンプ8によってプラズマチャンバ2に戻される。   The collection tank 7 is connected to the input side of the third pump 8 via the flow path 80. The output side of the third pump 8 is connected to the plasma chamber 2 via a flow path 81. The gas recovered in the recovery tank 7 is returned to the plasma chamber 2 by the third pump 8.

例えば、研削により所定の厚さに形成されたシリコンウエーハWの被研削面をプラズマエッチングすることにより研削歪みを除去しようとするときは、シリコンウエーハWの表面に保護テープ(不図示)が貼着され、そのシリコンウエーハWがプラズマチャンバ2に収容される。なお、シリコンウエーハWの一部をエッチングする場合には、エッチングされる方の面にマスキングが施される。   For example, when a grinding distortion is to be removed by plasma etching a surface to be ground of a silicon wafer W formed to a predetermined thickness by grinding, a protective tape (not shown) is attached to the surface of the silicon wafer W. Then, the silicon wafer W is accommodated in the plasma chamber 2. When a part of the silicon wafer W is etched, masking is applied to the surface to be etched.

プラズマチャンバ2にシリコンウエーハWが収容され保持されると、プラズマチャンバ2にエッチングガス、例えばSFガス(六フッ化硫黄)が供給されるとともに、高周波電力が印加される。そうすると、SFガスがプラズマ化され、硫黄原子やフッ素原子に含まれる電子が放出されて電離し、フッ素イオン(F)、硫黄イオン(S)、SFイオンなどが生成される。そして、このようなイオンや励起されたラジカルによってシリコンウエーハWの被研削面がエッチングされる。 When the silicon wafer W is accommodated and held in the plasma chamber 2, an etching gas such as SF 6 gas (sulfur hexafluoride) is supplied to the plasma chamber 2 and high-frequency power is applied. Then, SF 6 gas is turned into plasma, and electrons contained in sulfur atoms and fluorine atoms are released and ionized to generate fluorine ions (F), sulfur ions (S), SF 2 ions, and the like. Then, the surface to be ground of the silicon wafer W is etched by such ions and excited radicals.

また、シリコンウエーハWとF分子とが反応してSiF分子が生成され、また、プラズマとシリコンウエーハWとが反応しエッチングされてSi分子が放出される。さらに、空気中に含まれる水分がプラズマされてHFイオンが生成されたり、H分子やO分子が生成されたりする。 Further, the silicon wafer W reacts with the F 4 molecules to generate SiF 4 molecules, and the plasma and the silicon wafer W react to be etched to release Si molecules. Furthermore, moisture contained in the air is plasmad to generate HF ions, and H 2 molecules and O 2 molecules are generated.

(1)第1の濾過工程
シリコンウエーハWのプラズマエッチングが行われた後、第1のポンプ3を作動させることにより、プラズマチャンバ2内のガスを吸引し、排気路30及び排気路31を介して吸引したガスを第1のフィルタ4に導く。
(1) First Filtration Step After the plasma etching of the silicon wafer W is performed, the first pump 3 is operated to suck the gas in the plasma chamber 2 through the exhaust passage 30 and the exhaust passage 31. Then, the sucked gas is guided to the first filter 4.

第1のフィルタ4では、酸化メタル又は水酸化メタルによって、主として酸性ガスが吸着される。ここで吸着されるガスは、S,F,Si,HF,HO,SO,SF2,SiFである。このようにして、プラズマチャンバ2から排気されたガスのうち、S,F,Si,HF,HO,SO,SF2,SiFが濾過される。 In the first filter 4, acid gas is mainly adsorbed by metal oxide or metal hydroxide. The gases adsorbed here are S, F, Si, HF, H 2 O, SO 2 , SF 2 and SiF 4 . In this way, S, F, Si, HF, H 2 O, SO 2 , SF 2 , and SiF 4 out of the gas exhausted from the plasma chamber 2 are filtered.

(2)第2の濾過工程
第1のフィルタ4において吸着されなかった分子、すなわち、SF分子、O分子及びH分子は、第2のポンプ5によって吸引され、第2のフィルタ6に導かれる。第2のフィルタ6では、これらが中空糸膜60を通る。そうすると、O2分子及びH2分子は、SF6分子よりも分子径が小さいため、中空糸膜60の途中で外部に放出され、ガス排出口63から第2のフィルタ6の外部に排出される。
(2) Second Filtration Step Molecules that are not adsorbed in the first filter 4, that is, SF 6 molecules, O 2 molecules, and H 2 molecules are sucked by the second pump 5 and are absorbed by the second filter 6. Led. In the second filter 6, these pass through the hollow fiber membrane 60. Then, since the O 2 molecule and the H 2 molecule have a molecular diameter smaller than that of the SF 6 molecule, the O 2 molecule and the H 2 molecule are discharged to the outside in the middle of the hollow fiber membrane 60 and discharged from the gas discharge port 63 to the outside of the second filter 6. .

一方、SF分子は、O2分子及びH2分子よりも分子径が大きいため、中空糸膜60の他端62まで導かれ、他端62から流路70を介して回収タンク7に流入する。すなわち、中空糸膜60に形成される孔を、O2分子及びH2分子は通すがSF分子を通さない径に形成しておくことにより、O2分子及びH2分子とSF6分子とを分離し、SF6分子のみを回収タンク7に回収することができる。このようにして、第1のフィルタ4で濾過されなかったガスのうち、O2分子及びH2分子を濾過する。 On the other hand, since the SF 6 molecule has a larger molecular diameter than the O 2 molecule and the H 2 molecule, the SF 6 molecule is guided to the other end 62 of the hollow fiber membrane 60 and flows into the recovery tank 7 from the other end 62 through the flow path 70. . That is, by forming the holes formed in the hollow fiber membrane 60 with a diameter that allows O 2 molecules and H 2 molecules to pass but not SF 6 molecules, O 2 molecules, H 2 molecules, and SF 6 molecules And only the SF 6 molecules can be recovered in the recovery tank 7. In this way, O 2 molecules and H 2 molecules are filtered out of the gas not filtered by the first filter 4.

回収タンク7に回収されたSF分子は、プラズマチャンバ2においてプラズマエッチングのためにSFガスが必要とされるときに、第3のポンプ8によって流路80,81を介してプラズマチャンバ2に導かれ、プラズマエッチング時に再利用される。そして、プラズマエッチング終了後は、上記と同様に、第1の濾過工程及び第2の濾過工程を経て、使用されなかったSFガスが回収タンク7に回収され、再びプラズマチャンバ2におけるプラズマエッチングに利用される。 The SF 6 molecules collected in the collection tank 7 are transferred to the plasma chamber 2 by the third pump 8 via the flow paths 80 and 81 when SF 6 gas is required for plasma etching in the plasma chamber 2. Guided and reused during plasma etching. After the plasma etching is completed, the SF 6 gas that has not been used is recovered in the recovery tank 7 through the first filtration step and the second filtration step in the same manner as described above, and again in the plasma etching in the plasma chamber 2. Used.

以上のように、本発明では、プラズマチャンバ2から排気されるガスを、水酸化メタルまたは酸化メタルを備える第1のフィルタ4において濾過し、その後、第1のフィルタを通過したガスを、中空糸膜からなる第2のフィルタにおいて濾過するため、簡易な構成でエッチングガスを回収し再利用することができる。   As described above, in the present invention, the gas exhausted from the plasma chamber 2 is filtered by the first filter 4 provided with metal hydroxide or metal oxide, and then the gas that has passed through the first filter is passed through the hollow fiber. Since filtration is performed in the second filter made of a film, the etching gas can be recovered and reused with a simple configuration.

なお、プラズマを発生させるためにプラズマチャンバ2に供給されるガスは、SF6には限られない。例えば、被加工物がシリコンウエーハであれば、他のフッ素系ガス、例えばCF4等でもよいし、Cl2等の塩素系ガスでもよい。さらに、被加工物の種類に応じて、適宜のエッチングガスを選択することができる。再利用するエッチングガスの分子径に応じて、第2のフィルタ6を構成する中空糸膜60の孔の大きさを変更すればよい。 Note that the gas supplied to the plasma chamber 2 for generating plasma is not limited to SF 6 . For example, if the workpiece is a silicon wafer, other fluorine-based gas, such as CF 4, or chlorine-based gas such as Cl 2 may be used. Furthermore, an appropriate etching gas can be selected according to the type of workpiece. What is necessary is just to change the magnitude | size of the hole of the hollow fiber membrane 60 which comprises the 2nd filter 6 according to the molecular diameter of the etching gas to reuse.

1:回収装置
2:プラズマチャンバ
3:第1のポンプ 30、31:排気路
4:第1のフィルタ
5:第2のポンプ 50、51:流路
6:第2のフィルタ 60:中空糸膜 61:一端 62:他端 63:ガス排出口
7:回収タンク 70:流路
8:第3のポンプ 80,81:流路
1: collection device 2: plasma chamber 3: first pump 30, 31: exhaust path 4: first filter 5: second pump 50, 51: flow path 6: second filter 60: hollow fiber membrane 61 : One end 62: the other end 63: gas discharge port 7: recovery tank 70: flow path 8: third pump 80, 81: flow path

Claims (1)

プラズマエッチング装置におけるエッチングガスの回収方法であって、
チャンバから排気されるガスを、水酸化メタルまたは酸化メタルを備える第1のフィルタにおいて濾過する第1の濾過工程と、
該第1の濾過工程後、該第1のフィルタを通過したガスを、中空糸膜からなる第2のフィルタにおいて濾過する第2の濾過工程と、
からなるプラズマエッチングガスの回収方法。
An etching gas recovery method in a plasma etching apparatus,
A first filtration step of filtering gas exhausted from the chamber in a first filter comprising metal hydroxide or metal oxide;
After the first filtration step, a second filtration step of filtering the gas that has passed through the first filter, the second filter comprising a hollow fiber membrane,
A method for recovering a plasma etching gas comprising:
JP2015161724A 2015-08-19 2015-08-19 Recovery method of plasma etching gas Pending JP2017039074A (en)

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CN201610647277.2A CN106466547A (en) 2015-08-19 2016-08-09 The recovery method of plasma etching gas
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JP2002363113A (en) * 2001-05-31 2002-12-18 Research Institute Of Innovative Technology For The Earth Method and apparatus for separating and recovering perfluoro compound gas
JP2008137847A (en) * 2006-12-01 2008-06-19 Air Liquide Japan Ltd Xenon retrieval system and retrieval device
JP2010063995A (en) * 2008-09-10 2010-03-25 Sekisui Chem Co Ltd Plasma treating method and apparatus
JP2014104454A (en) * 2012-11-30 2014-06-09 Air Water Inc Apparatus and method for harmfulness elimination treatment of perfluoro compound type exhaust gas

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