JP6691152B2 - 半導体装置の製造方法、基板処理装置およびプログラム - Google Patents
半導体装置の製造方法、基板処理装置およびプログラム Download PDFInfo
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- JP6691152B2 JP6691152B2 JP2018020005A JP2018020005A JP6691152B2 JP 6691152 B2 JP6691152 B2 JP 6691152B2 JP 2018020005 A JP2018020005 A JP 2018020005A JP 2018020005 A JP2018020005 A JP 2018020005A JP 6691152 B2 JP6691152 B2 JP 6691152B2
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- 239000000758 substrate Substances 0.000 title claims description 109
- 239000004065 semiconductor Substances 0.000 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000007789 gas Substances 0.000 claims description 214
- 239000011261 inert gas Substances 0.000 claims description 65
- 238000000034 method Methods 0.000 claims description 58
- 230000008569 process Effects 0.000 claims description 38
- 239000010409 thin film Substances 0.000 claims description 18
- 239000002243 precursor Substances 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 13
- 239000010408 film Substances 0.000 description 58
- 235000012431 wafers Nutrition 0.000 description 51
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 15
- 229910052710 silicon Inorganic materials 0.000 description 15
- 239000010703 silicon Substances 0.000 description 15
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 14
- 229910001882 dioxygen Inorganic materials 0.000 description 14
- 238000010926 purge Methods 0.000 description 14
- 238000003860 storage Methods 0.000 description 11
- 238000011144 upstream manufacturing Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 9
- 239000012495 reaction gas Substances 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000011800 void material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- -1 for example Chemical compound 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- GIRKRMUMWJFNRI-UHFFFAOYSA-N tris(dimethylamino)silicon Chemical compound CN(C)[Si](N(C)C)N(C)C GIRKRMUMWJFNRI-UHFFFAOYSA-N 0.000 description 1
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- H01L21/02312—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment treatment by exposure to a gas or vapour
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Description
深溝を有する基板を、基板搬入出口を介して搬送空間に搬入し、前記基板を処理空間に移動し、前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、前記処理空間に第一の処理ガスを供給して第一の圧力とし、前記深溝に前駆体を形成すると共に、前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記第一の圧力との圧力差を所定の範囲にし、その後、前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、前記処理空間に第二の処理ガスを供給して第一の圧力よりも高い第二の圧力とし、前記深溝に形成された前記前駆体を改質して薄膜を形成すると共に、前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記第二の圧力との圧力差を前記所定の範囲に維持する。
まずチャンバを説明する。
基板処理装置200はチャンバ202を有する。チャンバ202は、例えば横断面が円形であり扁平な密閉容器として構成されている。また、チャンバ202は、例えばアルミニウム(Al)やステンレス(SUS)などの金属材料により構成されている。チャンバ202内には、基板としてのシリコンウエハ等のウエハ100を処理する処理空間205と、ウエハ100を処理空間205に搬送する際にウエハ100が通過する搬送空間206とが形成されている。チャンバ202は、上部容器202aと下部容器202bで構成される。上部容器202aと下部容器202bの間には仕切り板208が設けられる。
シャワーヘッド230は、蓋231を有する。蓋231はフランジ232を有し、フランジ232は上部容器202a上に支持される。更に、蓋231は位置決め部233を有する。位置決め部233が上部容器202aに勘合されることで、蓋231が固定される。
続いてガス供給部を説明する。共通ガス供給管242には、第一ガス供給管243a、第二ガス供給管244a、第三ガス供給管245aが接続されている。また、下部容器202bには、第四ガス供給管248aが接続されている。
第一ガス供給管243aには、上流方向から順に、第一ガス供給源243b、流量制御器(流量制御部)であるマスフローコントローラ(MFC)243c、及び開閉弁であるバルブ243dが設けられている。
第二ガス供給管244aの上流には、上流方向から順に、反応ガス供給源244b、流量制御器(流量制御部)であるマスフローコントローラ(MFC)244c、及び開閉弁であるバルブ244dが設けられている。反応ガスをプラズマ状態とする場合には、バルブ244dの下流にリモートプラズマユニット(RPU)244eを設ける。
第三ガス供給管245aには、上流方向から順に、第三ガス供給源245b、流量制御器(流量制御部)であるマスフローコントローラ(MFC)245c、及び開閉弁であるバルブ245dが設けられている。
第四ガス供給管248aには、上流方向から順に、第四ガス供給源248b、流量制御器(流量制御部)であるマスフローコントローラ(MFC)248c、及び開閉弁であるバルブ248dが設けられている。
チャンバ202の雰囲気を排気する排気系は、処理空間205の雰囲気を排気する処理空間排気系261、搬送空間206の雰囲気を排気する搬送空間排気系262で主に構成される。
排気管262aは、搬送空間206を構成する下部容器202bの側面あるいは底面に設けられる。排気管262aには、搬送空間206内を所定の圧力に制御する圧力制御器であるAPC262c、が設けられる。なお、排気管262に、ポンプ262e(TMP。Turbo Molecular Pump)を設けても良い。排気管262aにおいてポンプ262eの上流側には搬送空間用排気バルブとしてのバルブ262bが設けられる。更には、排気管262aには搬送空間206の圧力を検出する第二の圧力検出部262dが設けられる。排気管262aとAPC262c、バルブ262b、第二の圧力検出部262dをまとめて搬送室排気系262と呼ぶ。搬送室排気系262に、ポンプ262eを含めても良い。
基板処理装置200は、基板処理装置200の各部の動作を制御するコントローラ280を有している。コントローラ280は、図2に記載のように、演算部(CPU)280a、一時記憶部280b、記憶部280c、送受信部280dを少なくとも有する。コントローラ280は、送受信部280dを介して基板処理装置200の各構成に接続され、上位コントローラや使用者の指示に応じて記憶部280cからプログラムやレシピを呼び出し、その内容に応じて各構成の動作を制御する。なお、コントローラ280は、専用のコンピュータとして構成してもよいし、汎用のコンピュータとして構成してもよい。例えば、上述のプログラムを格納した外部記憶装置(例えば、磁気テープ、フレキシブルディスクやハードディスク等の磁気ディスク、CDやDVD等の光ディスク、MO等の光磁気ディスク、USBメモリ(USB Flash Drive)やメモリカード等の半導体メモリ)282を用意し、外部記憶装置282を用いて汎用のコンピュータにプログラムをインストールすることにより、本実施形態に係るコントローラ280を構成することができる。また、コンピュータにプログラムを供給するための手段は、外部記憶装置282を介して供給する場合に限らない。例えば、インターネットや専用回線等の通信手段を用いても良いし、上位装置270から送受信部283を介して情報を受信し、外部記憶装置282を介さずにプログラムを供給するようにしてもよい。また、キーボードやタッチパネル等の入出力装置281を用いて、コントローラ280に指示をしても良い。
続いて、処理対象の半導体装置の一例を図3から図6を用いて説明する。処理対象の半導体装置は、積層タイプのメモリである。図4は、図3に記載のホール106に電荷トラップ膜等を充填させた状態の図である。図5は犠牲膜104を除去した状態であり、空隙111が形成された状態の図である。図6は空隙11に金属膜112を充填させた図である。
ホール106内には、外周側から順に保護膜107、ゲート電極間絶縁膜-電荷トラップ膜-トンネル絶縁膜の積層膜108、チャネルポリシリコン膜109、充填絶縁膜110が形成される。各膜は筒状に構成される。
図7、図8を用いて基板処理装置200を用いた基板処理工程について説明する。図7は処理フローを説明する図であり、図8は各フローと圧力との関係を示した図である。
基板搬入・載置工程を説明する。図7においては、本工程の説明を省略する。
基板処理装置200では基板載置台212をウエハ100の搬送位置(搬送ポジション)まで下降させることにより、基板載置台212の貫通孔214にリフトピン207を貫通させる。その結果、リフトピン207が、基板載置台212表面よりも所定の高さ分だけ突出した状態となる。次にバルブ262bを開き、搬送空間206とAPC262cの間を連通させ、処理室205及び搬送室206の雰囲気を排気する。
第一の処理ガス供給工程S202を説明する。ウエハ100を加熱して所望とする温度に達すると、バルブ243dを開くと共に、DCSガスの流量が所定の流量となるように、マスフローコントローラ243cを調整する。なお、DCSガスの供給流量は、例えば100sccm以上800sccm以下である。このとき、第三ガス供給系のバルブ245dを開き、第三ガス供給管245aからN2ガスを供給する。第一不活性ガス供給系からN2ガスを流してもよい。
望ましくは、バルブ243dを閉じる前に、マスフローコントローラ243c、マスフローコントローラ248c、APC261c、APC262cを制御して、供給開始時と同様に、搬送空間206と処理空間205の圧力差が所定の範囲内に維持されるよう制御する。更には、処理空間205、搬送空間206の圧力を徐々に変動させることが望ましい。
第一のパージ工程S204を説明する。バルブ245dを開けて第三ガス供給管245aからN2ガスを供給し、シャワーヘッド230および処理空間205のパージを行う。それと並行して、バルブ248dを開けて第四ガス供給管248aからN2ガスを供給して、処理空間205と搬送空間206の圧力差が所定の範囲内となるよう制御する。例えば、処理空間205と搬送空間206を同圧、もしくは処理空間205よりも搬送空間206がやや高い圧力になるよう制御する。
望ましくは、バルブ245dを閉じる前に、マスフローコントローラ245c、マスフローコントローラ248c、APC261c、APC262cを制御して、搬送空間206と処理空間205の圧力差が所定の範囲内に維持されるよう制御する。更には、処理空間205、搬送空間206の圧力を徐々に変動させることが望ましい。
第二の処理ガス供給工程S206を説明する。第一のパージ工程S204の後、バルブ244dを開けて、シャワーヘッド230を介して、処理空間205内に酸素ガスの供給を開始する。
望ましくは、バルブ244dを閉じる前に、マスフローコントローラ244c、マスフローコントローラ248c、APC261c、APC262cを制御して、搬送空間206と処理空間205の圧力差が所定の範囲内に維持されるよう制御する。更には、処理空間205、搬送空間206の圧力を徐々に変動させることが望ましい。
第二のパージ工程S208を説明する。第一のパージ工程S204と同様、第三ガス供給管245aからN2ガスを供給し、シャワーヘッド230および処理空間205のパージを行う。それと並行して、第四ガス供給管248aからN2ガスを供給して、処理空間205と搬送空間206の圧力差が所定の範囲内となるよう制御する。例えば、処理空間205と搬送空間206を同圧、もしくは処理空間205よりも搬送空間206がやや高い圧力になるよう制御する。
このような圧力値とすることでこのようにすると不活性ガスの流速が上がるので、ガスの置換効率を向上できる。すなわち、第二の処理ガス供給工程S206で供給した第二の処理ガスを早期にパージできる。
なお、図8においては、処理空間205と搬送空間206の圧力をそれぞれP3とし、同圧としている。
望ましくは、バルブ245dを閉じる前に、マスフローコントローラ245c、マスフローコントローラ248c、APC261c、APC262cを制御して、搬送空間206と処理空間205の圧力差が所定の範囲内に維持されるよう制御する。更には、処理空間205、搬送空間206の圧力を徐々に変動させることが望ましい。
判定S210を説明する。コントローラ280は、上記1サイクルを所定回数(n cycle)実施したか否かを判定する。
基板搬出工程では、基板載置台212を下降させ、基板載置台212の表面から突出させたリフトピン207上にウエハ100を支持させる。これにより、ウエハ100は処理位置から搬送位置となる。その後、ゲートバルブ149を開き、アーム(不図示)を用いてウエハ100をチャンバ202の外へ搬出する。
102 絶縁膜
103 犠牲膜
106 ホール
111 空隙
200 基板処理装置
Claims (9)
- 深溝を有する基板を、基板搬入出口を介して搬送空間に搬入する工程と、
前記基板を処理空間に移動する工程と、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第一の処理ガスを供給して第一の圧力とし、前記深溝に前駆体を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記処理空間の圧力を同圧にするか、あるいは前記搬送空間の圧力を前記処理空間の圧力よりも高くする第一の処理ガス供給工程と、
前記第一の処理ガス供給工程の後、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第二の処理ガスを供給して第一の圧力よりも高い第二の圧力とし、前記深溝に形成された前記前駆体を改質して薄膜を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記第二の圧力との圧力差を所定の範囲に維持する
第二の処理ガス供給工程と
を有する半導体装置の製造方法。 - 前記第一の圧力は、前記第一の処理ガスが再結合しない圧力である請求項1に記載の半導体装置の製造方法。
- 前記第二の処理ガス供給工程では、前記搬送空間の圧力と前記処理空間の圧力を同圧にするか、あるいは前記搬送空間の圧力を前記処理空間の圧力よりも高くする請求項1または請求項2に記載の半導体装置の製造方法。
- 前記第一の処理ガスは、SiH 2 Cl 2 またはSi 2 Cl 6 またはSiH(N(CH 3 ) 2 ) 3 のいずれかである請求項1から請求項3のうち、いずれか一項に記載の半導体装置の製造方法。
- 基板搬入出口に隣接し、基板を搬送する搬送空間を有する搬送室と、
前記搬送室の上方であって、基板を処理する処理空間を有する処理室と、
前記処理空間にて処理される深溝を有する基板を支持する基板支持部と、
前記処理空間に処理ガスを供給する処理ガス供給部と、
前記搬送空間に不活性ガスを供給する不活性ガス供給部と、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第一の処理ガスを供給して第一の圧力とし、前記深溝に前駆体を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記処理空間の圧力を同圧にするか、あるいは前記搬送空間の圧力を前記処理空間の圧力よりも高くする手順と、
その後、前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第二の処理ガスを供給して第一の圧力よりも高い第二の圧力とし、前記深溝に形成された前記前駆体を改質して薄膜を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記第二の圧力との圧力差を所定の範囲に維持する
手順とを
実行する制御部と、
を有する基板処理装置。 - 深溝を有する基板を、基板搬入出口を介して搬送空間に搬入する手順と、
前記基板を処理空間に移動する手順と、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第一の処理ガスを供給して第一の圧力とし、前記深溝に前駆体を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記処理空間の圧力を同圧にするか、あるいは前記搬送空間の圧力を前記処理空間の圧力よりも高くする手順と、
その後、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第二の処理ガスを供給して第一の圧力よりも高い第二の圧力とし、前記深溝に形成された前記前駆体を改質して薄膜を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記第二の圧力との圧力差を所定の範囲に維持する
手順と、
をコンピュータによって基板処理装置に実行させるプログラム。 - 深溝を有する基板を、基板搬入出口を介して搬送空間に搬入する工程と、
前記基板を処理空間に移動する工程と、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第一の処理ガスを供給して第一の圧力とし、前記深溝に前駆体を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記第一の圧力との圧力差を所定の範囲に維持する第一の処理ガス供給工程と、
前記第一の処理ガス供給工程の後、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第二の処理ガスを供給して第一の圧力よりも高い第二の圧力とし、前記深溝に形成された前記前駆体を改質して薄膜を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記処理空間の圧力を同圧にするか、あるいは前記搬送空間の圧力を前記処理空間の圧力よりも高くする第二の処理ガス供給工程と、
を有する半導体装置の製造方法。 - 基板搬入出口に隣接し、基板を搬送する搬送空間を有する搬送室と、
前記搬送室の上方であって、基板を処理する処理空間を有する処理室と、
前記処理空間にて処理される深溝を有する基板を支持する基板支持部と、
前記処理空間に処理ガスを供給する処理ガス供給部と、
前記搬送空間に不活性ガスを供給する不活性ガス供給部と、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第一の処理ガスを供給して第一の圧力とし、前記深溝に前駆体を形成すると共に、
前記搬送空間に不活性ガスを供給して前記搬送空間の圧力と前記第一の圧力との圧力差を所定の範囲に維持する手順と、
その後、前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第二の処理ガスを供給して第一の圧力よりも高い第二の圧力とし、前記深溝に形成された前記前駆体を改質して薄膜を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記処理空間の圧力を同圧にするか、あるいは前記搬送空間の圧力を前記処理空間の圧力よりも高くする
手順とを
実行する制御部と、
を有する基板処理装置。 - 深溝を有する基板を、基板搬入出口を介して搬送空間に搬入する手順と、
前記基板を処理空間に移動する手順と、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第一の処理ガスを供給して第一の圧力とし、前記深溝に前駆体を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記第一の圧力との圧力差を所定の範囲に維持する手順と、
その後、
前記処理空間と前記搬送空間が連通し、前記処理空間に前記基板がある状態で、
前記処理空間に第二の処理ガスを供給して第一の圧力よりも高い第二の圧力とし、前記深溝に形成された前記前駆体を改質して薄膜を形成すると共に、
前記搬送空間に不活性ガスを供給して、前記搬送空間の圧力と前記処理空間の圧力を同圧にするか、あるいは前記搬送空間の圧力を前記処理空間の圧力よりも高くする
手順と、
をコンピュータによって基板処理装置に実行させるプログラム。
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