JP7372073B2 - 基板処理方法、基板処理装置及びクリーニング装置 - Google Patents
基板処理方法、基板処理装置及びクリーニング装置 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims description 147
- 238000004140 cleaning Methods 0.000 title claims description 17
- 238000003672 processing method Methods 0.000 title claims description 14
- 238000005530 etching Methods 0.000 claims description 66
- -1 ammonium fluorosilicate Chemical compound 0.000 claims description 35
- 239000007795 chemical reaction product Substances 0.000 claims description 30
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 28
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 12
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 6
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- XZXYQEHISUMZAT-UHFFFAOYSA-N 2-[(2-hydroxy-5-methylphenyl)methyl]-4-methylphenol Chemical compound CC1=CC=C(O)C(CC=2C(=CC=C(C)C=2)O)=C1 XZXYQEHISUMZAT-UHFFFAOYSA-N 0.000 claims description 2
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 2
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 229940107816 ammonium iodide Drugs 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 45
- 238000000034 method Methods 0.000 description 39
- 230000008569 process Effects 0.000 description 36
- 238000010438 heat treatment Methods 0.000 description 27
- 238000010586 diagram Methods 0.000 description 16
- 230000032258 transport Effects 0.000 description 9
- 230000007723 transport mechanism Effects 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000004380 ashing Methods 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Description
はじめに、一実施形態に係る基板処理システム10の一例について、図1を参照しながら説明する。図1は、一実施形態に係る基板処理システム10の一例を示す図である。基板処理システム10では、一実施形態に係るエッチング工程及び熱処理工程を含む基板処理方法が実行される。
図2は、エッチング工程の後に大気に曝露したエッチング対象膜の一例を示す図である。図2のエッチング対象膜は、窒化シリコン膜(SiN)110と、酸化シリコン膜(SiO2)120とを積層させた積層膜である。エッチング工程では、CF系ガスのプラズマを用いてマスク130を通して積層膜をエッチングすることにより、積層膜にスリット形状の溝やホールが形成される。
次に、一実施形態に係る基板処理装置1について、図3を用いて説明する。図3は、一実施形態に係る基板処理装置1の一例を示す図である。ここでは、基板処理装置1の一例として容量結合型プラズマエッチング装置を挙げる。基板処理装置1は、基板処理システム10の処理室11~14のうち、エッチング処理又は熱処理の少なくともいずれかが実行される処理室に相当する。
図4は、エッチング工程で生成され、窒化シリコン膜に形成されたスリットの側壁に堆積した反応生成物の分析結果を示す図である。本実験では、基板処理装置1にて基板上に形成されたエッチング対象膜である窒化シリコン膜をCF4及びH2のガスでエッチングした後、その基板を24時間大気中に放置した。その後、TOF(Time of Flight)-SIMS(二次イオン質量分析法)により窒化シリコン膜の側壁の反応生成物の分析を行った。
図5は、一実施形態に係る基板処理方法の一例を示すフローチャートである。本処理が開始されると、処理室11~14のうち、エッチングを行う処理室へ基板を搬送し、基板を準備する(ステップS1)。なお、基板に形成されたエッチング対象膜は、シリコン含有膜であればよい。エッチング対象膜は、窒化シリコン膜であってもよいし、酸化シリコン膜であってもよいし、酸化シリコン膜と窒化シリコン膜の積層膜であってもよい。
ガス種 C4F8、H2、Ar
圧力 10mT~100mT(1.33Pa~13.3Pa)
ステージ温度(基板温度) -60℃~0℃
高周波電力HF オン
ガス種 N2ガス又はArガス
圧力 1T~100T(133Pa~13300Pa)
なお、図3に示す熱処理時、熱処理を行うステージ121の温度は、ケイフッ化アンモニウムの反応生成物を加熱分解する温度よりも高い。かつ、ステージ121の温度は、基板上のエッチング対象膜が熱変形する温度、マスクが熱変形する温度、及びエッチング工程で生成された、ベベル部に付着したベベルデポが熱変形する温度のうち、最も低い温度よりも低い温度に設定される。
次に、実施例として、上記基板処理方法においてエッチング処理の後に行った熱処理の実験結果について、図7及び図8を参照して説明する。図7は、一実施形態に係る熱処理工程の後のエッチング対象膜の観察結果の一例を示す図である。図8は、図7に示す基板のベベル部Rに付着したベベルデポの観察結果の一例を示す図である。
最後に、図9を参照して一実施形態に係るクリーニング装置2について説明する。図9は、一実施形態に係るクリーニング装置2の一例を示す図である。
2 クリーニング装置
10 基板処理システム
11~14 処理室
20 真空搬送室
21 搬送機構
31,32 ロードロック室
40 大気搬送室
41 搬送機構
51~53 ロードポート
61~68 ゲートバルブ
70 制御部
102 処理容器
110 窒化シリコン膜
120 酸化シリコン膜
121 ステージ(下部電極)
122 上部電極
170 制御部
300 処理容器
301 ステージ
302 上部電極
310 上部ガス供給部
320 下部ガス供給部
330 ガス供給部
Claims (7)
- 複数のシリコン酸化膜と複数のシリコン窒化膜が交互に積層した積層膜とマスクとを含む基板を準備する工程と、
プラズマによって前記マスクを通じて前記積層膜をエッチングし、前記積層膜内に凹部を形成する工程であって、前記凹部の側壁にはケイフッ化アンモニウムまたはハロゲン化アンモニウムを含む反応生成物が形成される工程と、
形成される前記工程の後、前記基板を所定の温度で熱処理し、前記凹部の側壁から前記反応生成物を除去する工程と、
を有する、基板処理方法。 - 前記除去する工程において基板を載置するステージの温度は、
前記反応生成物を加熱分解する温度より高く、
前記積層膜が熱により変形又は変質する温度、前記マスクが熱により変形又は変質する温度、及び前記エッチングする工程で生成される炭素Cとフッ素Fとが含まれる反応生成物が熱により変形又は変質する温度のうち、最も低い温度より低い温度に設定される、
請求項1に記載の基板処理方法。 - 前記ハロゲン化アンモニウムは、フッ化アンモニウム、塩化アンモニウム、臭化アンモニウム、ヨウ化アンモニウムの少なくとも一つを含む、
請求項1又は2に記載の基板処理方法。 - 前記形成される工程と前記除去する工程とは、
基板を大気に曝露することなく実行される、
請求項1~3のいずれか一項に記載の基板処理方法。 - 前記除去する工程において、前記基板を載置するステージの温度を120℃以上250℃未満に設定する
請求項1~4のいずれか一項に記載の基板処理方法。 - 処理容器と、基板を載置するステージと、制御部と、を有する基板処理装置であって、
前記制御部は、
複数のシリコン酸化膜と複数のシリコン窒化膜が交互に積層した積層膜とマスクとを含む基板を準備する工程と、
プラズマによって前記マスクを通じて前記積層膜をエッチングし、前記積層膜内に凹部を形成する工程であって、前記凹部の側壁にはケイフッ化アンモニウムまたはハロゲン化アンモニウムを含む反応生成物が形成される工程と、
形成される前記工程の後、前記基板を所定の温度で熱処理し、前記凹部の側壁から前記反応生成物を除去する工程と、
を制御する、基板処理装置。 - 処理容器と、基板を載置するステージと、制御部と、を有するクリーニング装置であって、
前記制御部は、
複数のシリコン酸化膜と複数のシリコン窒化膜が交互に積層した積層膜とマスクとを含む基板を前記ステージに載置する工程と、
プラズマによって前記マスクを通じて前記積層膜をエッチングし、前記積層膜内に凹部を形成する工程であって、前記凹部の側壁にはケイフッ化アンモニウムまたはハロゲン化アンモニウムを含む反応生成物が形成される工程と、
形成される前記工程の後、基板を熱処理し、前記凹部の側壁から前記反応生成物であって、前記積層膜に堆積する反応生成物と、形成される前記工程で生成される炭素とフッ素とが含まれる反応生成物であって、前記基板のベベル部に堆積する反応生成物とを除去する、
クリーニング装置。
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