JP2015144268A5 - - Google Patents
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- JP2015144268A5 JP2015144268A5 JP2014262248A JP2014262248A JP2015144268A5 JP 2015144268 A5 JP2015144268 A5 JP 2015144268A5 JP 2014262248 A JP2014262248 A JP 2014262248A JP 2014262248 A JP2014262248 A JP 2014262248A JP 2015144268 A5 JP2015144268 A5 JP 2015144268A5
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- 210000002381 Plasma Anatomy 0.000 claims description 41
- 239000000376 reactant Substances 0.000 claims description 26
- 239000000758 substrate Substances 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 239000004065 semiconductor Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 4
- 238000006557 surface reaction Methods 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
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N Silicon nitride Chemical group N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims description 2
- 238000009616 inductively coupled plasma Methods 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims description 2
- 230000003252 repetitive Effects 0.000 claims 1
- 230000001737 promoting Effects 0.000 description 1
Description
図7A及び図7Bは、連続波プラズマによって堆積された膜(図7A)及びパルスプラズマによって堆積された膜(図7B)の、STEM−EEL解析によって測定された炭素及びシリコンについての相対的な面密度地図を示している。これらの図は、堆積された膜の様々な部分におけるC:Si比を示すことを目的として色で示されている。2枚の膜の側壁を比較すると、パルスプラズマによる膜は、連続波プラズマによって用意された膜よりも高いC:Si比を有することが明らかである。この高い側壁C:Si比は、パルスプラズマ膜によって成膜された特徴の側壁で観察される低いウェットエッチング速度と矛盾しない。特定の実施形態では、膜の側壁は、(側壁の実質的に垂直な部分において、図に応じてSTEM−EEL解析にしたがって又は同等な解析にしたがって測定された、平均で、)少なくとも約0.4又は約0.5又は約0.6のC:Si比を有する。図7Aに示された例では、パルスプラズマによる膜の平均の側壁C:Si比が約0.65である一方で、図7Bにおける連続波による膜は、約0.35の平均側壁C:Si比を有する。
適用例1:半導体基板表面上のギャップを満たす方法であって、
(a)その中に前記基板を有する反応チャンバに気相の第1の反応物を導入し、前記第1の反応物を前記基板表面上に吸着させ、
(b)前記第1の反応物の流れが停止した後に、前記反応チャンバをパージし、
(c)前記第1の反応物が前記基板表面上に吸着される間に、気相の第2の反応物を前記反応チャンバに導入し、
(d)前記基板表面上における前記第1の反応物と前記第2の反応物との間の表面反応を促して、前記ギャップを縁取る膜層を形成させるために、パルスプラズマであるプラズマに前記基板表面を暴露し、
(e)前記プラズマを消滅させ、
(f)前記反応チャンバをパージすること、
を備える方法。
適用例2:適用例1に記載の方法であって、
前記基板表面をプラズマに暴露する前記動作中における前記プラズマパルスの周波数は、約25Hzから約5000Hzの間である、方法。
適用例3:適用例2に記載の方法であって、
前記プラズマパルスの周波数は、約100Hzから約500Hzの間である、方法。
適用例4:適用例1から請求項3のいずれか一項に記載の方法であって、
前記堆積される膜は、シリコン窒化物膜又はシリコン炭窒化物膜である、方法。
適用例5:適用例1から請求項3のいずれか一項に記載の方法であって、
前記堆積される膜は、酸化物である、方法。
適用例6:適用例1から請求項5のいずれか一項に記載の方法であって、
前記動作(c)及び前記動作(d)は、少なくとも部分的に、同時に発生する、方法。
適用例7:適用例1から請求項6のいずれか一項に記載の方法であって、
前記プラズマは、容量結合プラズマ又は誘導結合プラズマである、方法。
適用例8:適用例1から請求項7のいずれか一項に記載の方法であって、
前記プラズマは、RFプラズマ発生器を使用して生成される、方法。
適用例9:適用例1から請求項8のいずれか一項に記載の方法であって、
プラズマ電力は、約50W/ステーションから約2500W/ステーションの間である、方法。
適用例10:適用例1から請求項9のいずれか一項に記載の方法であって、
前記ギャップの側壁の中間部分におけるウェットエッチング速度(WE m )と、前記ギャップの頂部におけるウェットエッチング速度(WE t )及び/又は前記ギャップの底部におけるウェットエッチング速度(WE b )との比は、約0.25から約3の間である、方法。
適用例11:適用例1から請求項10のいずれか一項に記載の方法であって、
前記ギャップ内の中間部分に形成される膜は、垂直方向に測定されたときに、約1Å/分から約25Å/分の間のウェットエッチング速度を示す、方法。
適用例12:適用例1から請求項11のいずれか一項に記載の方法であって、
前記ギャップの側壁における平均の炭素:シリコン比は、少なくとも約0.4である、方法。
適用例13:適用例1から請求項12のいずれか一項に記載の方法であって、
前記膜の組成は、前記膜全体を通じて実質的に均一である、方法。
適用例14:適用例1から請求項13のいずれか一項に記載の方法であって、更に、
前記動作(a)から前記動作(f)までを繰り返すことを備え、前記動作(d)の一度目の繰り返しは、前記動作(d)の二度目の繰り返しとは異なるパルス周波数で実施される、方法。
適用例15:適用例1から請求項14のいずれか一項に記載の方法であって、更に、
前記動作(a)から前記動作(f)までを繰り返すことを備え、前記動作(d)の一度目の繰り返しは、前記動作(d)の二度目の繰り返しとは異なるデューティサイクルで実施される、方法。
適用例16:適用例1から請求項15のいずれか一項に記載の方法であって、更に、
前記動作(a)から前記動作(f)までを繰り返すことを備え、前記動作(d)の一度目の繰り返しは、前記動作(d)の二度目の繰り返しとは異なるRF電力で実施される、方法。
適用例17:適用例1から請求項16のいずれか一項に記載の方法であって、
前記パルスプラズマは、オン状態とオフ状態との間でパルス化される、方法。
適用例18:適用例1から請求項16のいずれか一項に記載の方法であって、
前記パルスプラズマは、少なくとも第1の電力状態と第2の電力状態との間でパルス化され、前記第1の電力状態の最中に供給される電力は、前記第2の電力状態の最中に供給される電力とは異なり、前記第1の電力状態及び前記第2の電力状態のいずれも、オフ状態に対応しない、方法。
適用例19:基板上に膜を堆積させるための装置であって、
反応チャンバと、
気相の反応物を前記反応チャンバに供給するための入口と、
パルスプラズマを前記反応チャンバに提供するためのプラズマ発生器と、
コントローラであって、
(a)気相の第1の反応物を前記反応チャンバに導入するための命令と、
(b)気相の第2の反応物を前記反応チャンバに導入するための命令と、
(c)前記基板表面上における前記第1の反応物と前記第2の反応物との間の表面反応を促して、前記膜を形成させるために、前記第1の反応物の前記気相の流れが停止したときにパルスプラズマを定期的に打ち出して、前記基板表面をパルスプラズマに暴露するための命令と、
を有するコントローラと、
を備える装置。
適用例20:適用例19に記載の装置であって、
前記コントローラは、前記動作(c)の最中に約25Hzから約5000Hzの間の周波数で前記プラズマをパルス化させるための命令を有する、装置。
適用例21:適用例20に記載の装置であって、
前記コントローラは、前記動作(c)の最中に約100Hzから約500Hzの間の周波数で前記プラズマをパルス化させるための命令を有する、装置。
適用例22:適用例19から請求項21のいずれか一項に記載の装置であって、
前記コントローラは、前記動作(b)及び前記動作(c)を少なくとも部分的に同時に実施するための命令を有する、装置。
適用例23:適用例19から請求項22のいずれか一項に記載の装置であって、
前記コントローラは、前記動作(c)を約5%から約95%の間のプラズマデューティサイクルで実施するための命令を有する、装置
適用例24:適用例19から請求項23のいずれか一項に記載の装置であって、
前記コントローラは、前記動作(a)から前記動作(c)までを繰り返すための命令を有し、前記コントローラは、前記動作(c)の一度目の繰り返しを前記動作(c)の二度目の繰り返しとは異なるパルス周波数、及び/又はデューティサイクル、及び/又はRF電力で実施するための命令を有する、装置。
7A and 7B show the relative planes for carbon and silicon as measured by STEM-EEL analysis of films deposited by continuous wave plasma (FIG. 7A) and films deposited by pulsed plasma (FIG. 7B). A density map is shown. These figures are shown in color for the purpose of showing the C: Si ratio in various parts of the deposited film. Comparing the sidewalls of the two films, it is clear that the pulsed plasma film has a higher C: Si ratio than the film prepared by continuous wave plasma. This high sidewall C: Si ratio is consistent with the low wet etch rate observed on the feature sidewalls formed by the pulsed plasma film. In certain embodiments, the membrane sidewalls (at an average, measured in accordance with the STEM-EEL analysis in accordance with the figure or in accordance with an equivalent analysis, in a substantially vertical portion of the sidewall) are at least about 0. Having a C: Si ratio of 4 or about 0.5 or about 0.6. In the example shown in FIG. 7A, the average sidewall C: Si ratio of the pulsed plasma film is about 0.65, whereas the continuous wave film in FIG. 7B has an average sidewall C: Si of about 0.35. Have a ratio.
Application Example 1: A method of filling a gap on the surface of a semiconductor substrate,
(A) introducing a gas phase first reactant into a reaction chamber having the substrate therein, adsorbing the first reactant onto the substrate surface;
(B) purging the reaction chamber after the flow of the first reactant has stopped;
(C) introducing a gas phase second reactant into the reaction chamber while the first reactant is adsorbed on the substrate surface;
(D) In order to promote a surface reaction between the first reactant and the second reactant on the substrate surface to form a film layer that borders the gap, a plasma that is a pulsed plasma is used. Exposing the substrate surface;
(E) extinguishing the plasma;
(F) purging the reaction chamber;
A method comprising:
Application Example 2: The method described in Application Example 1,
The method wherein the frequency of the plasma pulse during the operation of exposing the substrate surface to the plasma is between about 25 Hz and about 5000 Hz.
Application Example 3: The method described in Application Example 2,
The method wherein the frequency of the plasma pulse is between about 100 Hz and about 500 Hz.
Application Example 4: The method according to any one of Application Examples 1 to 3,
The method wherein the deposited film is a silicon nitride film or a silicon carbonitride film.
Application Example 5: The method according to any one of Application Examples 1 to 3, wherein
The method wherein the deposited film is an oxide.
Application Example 6: The method according to any one of Application Examples 1 to 5,
The method (c) and (d) occur at least partially simultaneously.
Application Example 7: The method according to any one of Application Examples 1 to 6,
The method, wherein the plasma is capacitively coupled plasma or inductively coupled plasma.
Application Example 8: The method according to any one of Application Examples 1 to 7,
The method wherein the plasma is generated using an RF plasma generator.
Application Example 9: The method according to any one of Application Examples 1 to 8, wherein
The method wherein the plasma power is between about 50 W / station and about 2500 W / station.
Application Example 10: The method according to any one of Application Examples 1 to 9, wherein
The ratio of the wet etch rate (WE m ) at the middle portion of the gap sidewall to the wet etch rate (WE t ) at the top of the gap and / or the wet etch rate (WE b ) at the bottom of the gap is about A method that is between 0.25 and about 3.
Application Example 11: The method according to any one of Application Examples 1 to 10, wherein
The method wherein the film formed in the middle portion within the gap exhibits a wet etch rate between about 1 liter / minute and about 25 liter / minute when measured in the vertical direction.
Application Example 12: The method according to any one of Application Examples 1 to 11, wherein
The average carbon: silicon ratio in the gap sidewalls is at least about 0.4.
Application Example 13: The method according to any one of Application Examples 1 to 12,
The method wherein the composition of the film is substantially uniform throughout the film.
Application Example 14: The method according to any one of Application Examples 1 to 13, further comprising:
Repeating the operation (a) to the operation (f), the first repetition of the operation (d) is performed at a different pulse frequency from the second repetition of the operation (d). Method.
Application Example 15: The method according to any one of Application Examples 1 to 14, further comprising:
Repeating the operation (a) to the operation (f), wherein the first repetition of the operation (d) is performed with a different duty cycle than the second repetition of the operation (d). Method.
Application Example 16: The method according to any one of Application Examples 1 to 15, further comprising:
Repeating the operation (a) to the operation (f), the first repetition of the operation (d) is performed with a different RF power than the second repetition of the operation (d). Method.
Application Example 17: The method according to any one of Application Examples 1 to 16, wherein
The method, wherein the pulsed plasma is pulsed between an on state and an off state.
Application Example 18: The method according to any one of Application Examples 1 to 16, wherein
The pulsed plasma is pulsed at least between a first power state and a second power state, and power supplied during the first power state is during the second power state. Unlike the power supplied to, neither the first power state nor the second power state corresponds to an off state.
Application Example 19: An apparatus for depositing a film on a substrate,
A reaction chamber;
An inlet for supplying gas phase reactants to the reaction chamber;
A plasma generator for providing a pulsed plasma to the reaction chamber;
A controller,
(A) instructions for introducing a gas phase first reactant into the reaction chamber;
(B) instructions for introducing a gas phase second reactant into the reaction chamber;
(C) promoting the surface reaction between the first reactant and the second reactant on the substrate surface to form the film so that the gas phase of the first reactant Instructions for periodically firing a pulsed plasma when flow stops and exposing the substrate surface to the pulsed plasma;
A controller having
A device comprising:
Application Example 20: The apparatus according to Application Example 19,
The controller has instructions for pulsing the plasma at a frequency between about 25 Hz and about 5000 Hz during the operation (c).
Application Example 21: The apparatus according to Application Example 20,
The apparatus, wherein the controller has instructions for pulsing the plasma at a frequency between about 100 Hz and about 500 Hz during the operation (c).
Application Example 22: The apparatus according to any one of Application Examples 19 to 21, wherein
The apparatus, wherein the controller has instructions for performing the operations (b) and (c) at least partially simultaneously.
Application Example 23: The apparatus according to any one of Application Examples 19 to 22,
The controller has instructions for performing the operation (c) with a plasma duty cycle between about 5% and about 95%.
Application Example 24: The apparatus according to any one of Application Examples 19 to 23,
The controller has a command for repeating the operation (a) to the operation (c), and the controller repeats the first repetition of the operation (c) for the second time of the operation (c). A device having instructions for performing at a different pulse frequency and / or duty cycle and / or RF power than.
Claims (24)
(a)その中に前記半導体基板を有する反応チャンバに気相の第1の反応物を導入し、前記第1の反応物を前記半導体基板表面上に吸着させ、
(b)前記第1の反応物の流れが停止した後に、前記反応チャンバをパージし、
(c)前記第1の反応物が前記半導体基板の表面上に吸着される間に、気相の第2の反応物を前記反応チャンバに導入し、
(d)前記半導体基板の表面上における前記第1の反応物と前記第2の反応物との間の表面反応を促して、前記ギャップを縁取る膜層を形成させるために、パルスプラズマであるプラズマに前記半導体基板の表面を暴露し、
(e)前記プラズマを消滅させ、
(f)前記反応チャンバをパージすること、
を備える方法。 A method for filling a gap on a semiconductor substrate surface,
(A) introducing a gas phase first reactant into a reaction chamber having the semiconductor substrate therein, and adsorbing the first reactant on the surface of the semiconductor substrate;
(B) purging the reaction chamber after the flow of the first reactant has stopped;
(C) introducing a gas phase second reactant into the reaction chamber while the first reactant is adsorbed on the surface of the semiconductor substrate;
(D) pulsed plasma to promote a surface reaction between the first reactant and the second reactant on the surface of the semiconductor substrate to form a film layer bordering the gap. Exposing the surface of the semiconductor substrate to plasma;
(E) extinguishing the plasma;
(F) purging the reaction chamber;
A method comprising:
前記半導体基板の表面をプラズマに暴露する動作中におけるプラズマパルスの周波数は、約25Hzから約5000Hzの間である、方法。 The method of claim 1, comprising:
Wherein the frequency of the pulp Razumaparusu put the semiconductor substrate surface of the dynamic Sakuchu you exposed to plasma is between about 25Hz to about 5000 Hz, method.
前記プラズマパルスの周波数は、約100Hzから約500Hzの間である、方法。 The method of claim 2, comprising:
The method wherein the frequency of the plasma pulse is between about 100 Hz and about 500 Hz.
堆積される前記膜層は、シリコン窒化物膜層又はシリコン炭窒化物膜層である、方法。 A method according to any one of claims 1 to 3, comprising
The film layer to be sedimentary is a silicon nitride film layer or a silicon carbonitride film layer, methods.
堆積される前記膜層は、酸化物である、方法。 A method according to any one of claims 1 to 3, comprising
The film layer to be sedimentary is an oxide, methods.
動作(c)及び動作(d)は、少なくとも部分的に、同時に発生する、方法。 A method according to any one of claims 1 to 5, comprising
Operation (c)及beauty operation (d) is at least partially concurrent, method.
前記プラズマは、容量結合プラズマ又は誘導結合プラズマである、方法。 A method according to any one of claims 1 to 6, comprising
The method, wherein the plasma is capacitively coupled plasma or inductively coupled plasma.
前記プラズマは、RFプラズマ発生器を使用して生成される、方法。 A method according to any one of claims 1 to 7, comprising
The method wherein the plasma is generated using an RF plasma generator.
プラズマ電力は、約50W/ステーションから約2500W/ステーションの間である、方法。 A method according to any one of claims 1 to 8, comprising
The method wherein the plasma power is between about 50 W / station and about 2500 W / station.
前記ギャップの側壁の中間部分におけるウェットエッチング速度(WEm)と、前記ギャップの頂部におけるウェットエッチング速度(WEt)及び/又は前記ギャップの底部におけるウェットエッチング速度(WEb)との比は、約0.25から約3の間である、方法。 A method according to any one of claims 1 to 9, comprising
The ratio of the wet etch rate (WE m ) at the middle portion of the gap sidewall to the wet etch rate (WE t ) at the top of the gap and / or the wet etch rate (WE b ) at the bottom of the gap is about A method that is between 0.25 and about 3.
前記ギャップ内の中間部分に形成される膜層は、垂直方向に測定されたときに、約1Å/分から約25Å/分の間のウェットエッチング速度を示す、方法。 A method according to any one of claims 1 to 10, comprising
The method wherein the film layer formed in the middle portion of the gap exhibits a wet etch rate between about 1 liter / minute and about 25 liter / minute when measured in the vertical direction.
前記ギャップの側壁における平均の炭素:シリコン比は、少なくとも約0.4である、方法。 A method according to any one of claims 1 to 11, comprising
The average carbon: silicon ratio in the gap sidewalls is at least about 0.4.
前記膜層の組成は、前記膜層の全体を通じて実質的に均一である、方法。 A method according to any one of claims 1 to 12, comprising
The composition of the film layer is substantially uniform throughout the membrane layer, methods.
動作(a)から動作(f)までを繰り返すことを備え、動作(d)の一度目の繰り返しは、動作(d)の二度目の繰り返しとは異なるパルス周波数で実施される、方法。 14. A method according to any one of claims 1 to 13, further comprising:
Comprising repeating the up operation (a) or Rado operation (f), first time iteration of operation (d) is carried out at a different pulse frequency and the second time of repetition of the operation (d) ,Method.
動作(a)から動作(f)までを繰り返すことを備え、動作(d)の一度目の繰り返しは、動作(d)の二度目の繰り返しとは異なるデューティサイクルで実施される、方法。 15. A method according to any one of claims 1 to 14, further comprising:
Comprising repeating the up operation (a) or Rado operation (f), first time iteration of operation (d) is performed in a different duty cycle than the second time of repetition of the operation (d) ,Method.
動作(a)から動作(f)までを繰り返すことを備え、動作(d)の一度目の繰り返しは、動作(d)の二度目の繰り返しとは異なるRF電力で実施される、方法。 The method according to any one of claims 1 to 15, further comprising:
Comprising repeating the up operation (a) or Rado operation (f), first time iteration of operation (d) is performed in a different RF power from the second time of repetition of the operation (d) ,Method.
前記パルスプラズマは、オン状態とオフ状態との間でパルス化される、方法。 A method according to any one of claims 1 to 16, comprising
The method, wherein the pulsed plasma is pulsed between an on state and an off state.
前記パルスプラズマは、少なくとも第1の電力状態と第2の電力状態との間でパルス化され、前記第1の電力状態の最中に供給される電力は、前記第2の電力状態の最中に供給される電力とは異なり、前記第1の電力状態及び前記第2の電力状態のいずれも、オフ状態に対応しない、方法。 A method according to any one of claims 1 to 16, comprising
The pulsed plasma is pulsed at least between a first power state and a second power state, and power supplied during the first power state is during the second power state. Unlike the power supplied to, neither the first power state nor the second power state corresponds to an off state.
反応チャンバと、
気相の反応物を前記反応チャンバに供給するための入口と、
パルスプラズマを前記反応チャンバに提供するためのプラズマ発生器と、
コントローラであって、
(a)気相の第1の反応物を前記反応チャンバに導入するための命令と、
(b)気相の第2の反応物を前記反応チャンバに導入するための命令と、
(c)前記基板の表面上における前記第1の反応物と前記第2の反応物との間の表面反応を促して、前記膜を形成させるために、前記第1の反応物の前記気相の流れが停止したときにパルスプラズマを定期的に打ち出して、前記基板の表面をパルスプラズマに暴露するための命令と、
を有するコントローラと、
を備える装置。 An apparatus for depositing a film on a substrate,
A reaction chamber;
An inlet for supplying gas phase reactants to the reaction chamber;
A plasma generator for providing a pulsed plasma to the reaction chamber;
A controller,
(A) instructions for introducing a gas phase first reactant into the reaction chamber;
(B) instructions for introducing a gas phase second reactant into the reaction chamber;
(C) prompting a surface reaction between the first reactant and the second reactant on the surface of the substrate, in order to form the film, the gas phase of the first reactant Instructions for periodically firing a pulsed plasma when the flow of gas stops and exposing the surface of the substrate to the pulsed plasma;
A controller having
A device comprising:
前記コントローラは、動作(c)の最中に約25Hzから約5000Hzの間の周波数で前記プラズマをパルス化させるための命令を有する、装置。 The apparatus of claim 19, comprising:
Said controller comprising instructions for causing a pulsed the plasma at a frequency of between about 25Hz to about 5000Hz during operation (c), device.
前記コントローラは、動作(c)の最中に約100Hzから約500Hzの間の周波数で前記プラズマをパルス化させるための命令を有する、装置。 21. The apparatus of claim 20, wherein
Said controller comprising instructions for causing a pulsed the plasma at a frequency of between about 100Hz to about 500Hz during operation (c), device.
前記コントローラは、動作(b)及び動作(c)を少なくとも部分的に同時に実施するための命令を有する、装置。 The apparatus according to any one of claims 19 to 21, comprising:
Said controller having instructions for performing operating (b)及beauty operation (c) is at least partially simultaneously, device.
前記コントローラは、動作(c)を約5%から約95%の間のプラズマデューティサイクルで実施するための命令を有する、装置。 The apparatus according to any one of claims 19 to 22, comprising:
Said controller having instructions for performing operating the (c) the plasma duty cycle of between about 5% to about 95%, unit.
前記コントローラは、動作(a)から動作(c)までを繰り返すための命令を有し、前記コントローラは、動作(c)の一度目の繰り返しを動作(c)の二度目の繰り返しとは異なるパルス周波数、及び/又はデューティサイクル、及び/又はRF電力で実施するための命令を有する、装置。 24. The apparatus according to any one of claims 19 to 23, wherein:
The controller includes instructions for repeating until operation (a) or Rado operation (c), said controller operating the first time of the repetition of operation (c) the second time in (c) An apparatus having instructions for performing at a different pulse frequency and / or duty cycle and / or RF power than repetitive.
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