JP6587580B2 - エッチング処理方法 - Google Patents
エッチング処理方法 Download PDFInfo
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- JP6587580B2 JP6587580B2 JP2016116493A JP2016116493A JP6587580B2 JP 6587580 B2 JP6587580 B2 JP 6587580B2 JP 2016116493 A JP2016116493 A JP 2016116493A JP 2016116493 A JP2016116493 A JP 2016116493A JP 6587580 B2 JP6587580 B2 JP 6587580B2
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- 238000005530 etching Methods 0.000 title claims description 89
- 238000000034 method Methods 0.000 title claims description 41
- 239000007789 gas Substances 0.000 claims description 148
- 239000004215 Carbon black (E152) Substances 0.000 claims description 21
- 229930195733 hydrocarbon Natural products 0.000 claims description 21
- 150000002430 hydrocarbons Chemical class 0.000 claims description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 15
- 239000010703 silicon Substances 0.000 claims description 15
- 125000004432 carbon atom Chemical group C* 0.000 claims description 12
- 239000001257 hydrogen Substances 0.000 claims description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims description 12
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 12
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 11
- 239000011737 fluorine Substances 0.000 claims description 11
- 229910052731 fluorine Inorganic materials 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- 230000008569 process Effects 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 11
- 239000003507 refrigerant Substances 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 239000002826 coolant Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-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
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 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
- 238000007743 anodising Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 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
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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Description
まず、プラズマ処理装置1の一例について、図1を参照しながら説明する。本実施形態にかかるプラズマ処理装置1は、容量結合型の平行平板プラズマ処理装置であり、略円筒形の処理容器10を有している。処理容器10の内面には、アルマイト処理(陽極酸化処理)が施されている。処理容器10の内部は、プラズマによりエッチング処理や成膜処理等のプラズマ処理が行われる処理室となっている。
以下では、本実施形態に係るエッチング処理方法を説明する前に、比較例に係るエッチング処理の結果の一例について説明する。図2に示す比較例1は、エッチングガスとしてメタン(CH4)ガス及び四フッ化炭素(CF4)ガスを含むガスを使用した場合のエッチング結果の一例を示す。
・プロセス条件
ウェハ温度 −40℃以下
ガス CF4/CH4/O2
第1高周波電力HF 2500W、連続波
第2高周波電力LF 6000W、連続波
図2(a)〜図2(e)では、CF4とCH4との総流量は変えずに、CF4とCH4との分圧(流量比)を変えるように制御される。図2(a)ではCF4とCH4との分圧は19:4であり、図2(b)ではCF4とCH4との分圧は17:6である。図2(c)ではCF4とCH4との分圧は16:7であり、図2(d)ではCF4とCH4との分圧は15:8である。図2(e)では、CF4とCH4との分圧は13:10である。つまり、図2(a)から順に徐々にCF4に対するCH4の分圧を上げるように制御される。なお、O2ガスの流量は一定に制御される。供給するガスにO2ガスが含まれるのは、CF4及びCH4ガスに含まれるカーボンが増えるとマスクの間口が閉塞するため、これを避けるためである。
比較例2では、以下のプロセス条件にて積層膜12がエッチングされる。比較例2のプロセス条件は以下である。図3に示す比較例2は、エッチングガスとして六フッ化硫黄(SF6)ガス及び水素(H2)ガスを含むガスを使用した場合のエッチング結果の一例を示す。
・プロセス条件
ウェハ温度 −40℃以下
ガス SF6/H2(CHxFy系ガスの添加の有無)
第1高周波電力HF 2500W、連続波
第2高周波電力LF 4000W、連続波
図3(a)では、SF6ガス及びH2ガスにCHxFy系ガスを添加しない。図3(b)では、SF6ガス及びH2ガスにCHF3ガスを添加する。図3(c)では、SF6ガス及びH2ガスにCH4ガスを添加する。
次に、第1実施形態に係るエッチング処理方法の一例について、図4を参照して説明する。図4は、第1実施形態にかかるエッチング処理方法の一例を示すフローチャートである。
・プロセス条件
ウェハ温度 −40℃以下
ガス CF4/CH4/O2(C3H6ガスの添加の有無)
第1高周波電力HF 2500W、連続波
第2高周波電力LF 6000W、連続波
図5(a)は、CF4とCH4とO2ガスとにC3H6ガスを添加しなかった場合のエッチング結果を示し、図5(b)及び図5(c)は、CF4とCH4とO2ガスとにC3H6ガスを添加した場合のエッチング結果を示す。図5(b)では、CH4ガスとC3H6ガスとの分圧(流量比)は、5:1であり、全体流量に対するC3H6ガスの添加割合は3%である。図5(c)では、CH4ガスとC3H6ガスとの分圧は、2:1であり、全体流量に対するC3H6ガスの添加割合は7%である。
次に、第2実施形態に係るエッチング処理の一例について、図6を参照して説明する。図6は、第2実施形態にかかるエッチング処理の一例を示すフローチャートである。
・プロセス条件
ウェハ温度 −40℃以下
ガス SF6/H2(C3H6ガスの添加の有無)
第1高周波電力HF 2500W、連続波
第2高周波電力LF 6000W、連続波
図7(a)は、SF6及びH2ガスにC3H6ガスを添加しなかった場合のエッチング結果を示し、図7(b)は、SF6及びH2ガスにC3H6ガスを添加した場合のエッチング結果を示す。図7(b)では、ガスの全体流量に対するC3H6ガスの添加割合は7%である。
10 処理容器
11 有機膜
12 積層膜
15 ガス供給源
20 載置台
25 ガスシャワーヘッド
32 第1高周波電源
34 第2高周波電源
65 排気装置
70 可変直流電源
100 制御部
104 支持体
104a 冷媒流路
106 静電チャック
108 フォーカスリング
Claims (5)
- 基板の温度が−35℃以下の極低温環境において、第1高周波電源から第1高周波の電力を出力し、第2高周波電源から前記第1高周波よりも低い第2高周波の電力を出力し、
炭素、水素、及びフッ素を含有するガスからなるエッチングガスに、炭素原子数が3以上となるハイドロカーボンガスを添加してプラズマを生成し、シリコン酸化膜又は組成の異なるシリコン含有膜を積層した積層膜をエッチングし、
前記エッチングガスに含まれるCH 4 ガスに対して添加される前記ハイドロカーボンガスの流量比が1/5以上であり、前記エッチングガスと前記ハイドロカーボンガスの全体流量に対する前記ハイドロカーボンガスの添加割合が3%以上である、
エッチング処理方法。 - 基板の温度が−35℃以下の極低温環境において、第1高周波電源から第1高周波の電力を出力し、第2高周波電源から前記第1高周波よりも低い第2高周波の電力を出力し、
水素、硫黄、及びフッ素を含有するガスからなるエッチングガスに、炭素原子数が3以上となるハイドロカーボンガスを添加してプラズマを生成し、シリコン酸化膜又は組成の異なるシリコン含有膜を積層した積層膜をエッチングする、
エッチング処理方法。 - 炭素原子間の二重結合を1つ持つハイドロカーボンガスである、
請求項1又は2に記載のエッチング処理方法。 - 前記ハイドロカーボンガスはプロピレンである、
請求項1〜3のいずれか一項に記載のエッチング処理方法。 - 前記ハイドロカーボンガスの添加量は総流量の10%以下である、
請求項3又は4に記載のエッチング処理方法。
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