WO2014104290A1 - ドライエッチング方法 - Google Patents
ドライエッチング方法 Download PDFInfo
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- WO2014104290A1 WO2014104290A1 PCT/JP2013/085091 JP2013085091W WO2014104290A1 WO 2014104290 A1 WO2014104290 A1 WO 2014104290A1 JP 2013085091 W JP2013085091 W JP 2013085091W WO 2014104290 A1 WO2014104290 A1 WO 2014104290A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/20—Dry etching; Plasma etching; Reactive-ion etching
- H10P50/28—Dry etching; Plasma etching; Reactive-ion etching of insulating materials
- H10P50/282—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of inorganic materials
- H10P50/283—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of inorganic materials by chemical means
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/73—Etching of wafers, substrates or parts of devices using masks for insulating materials
Definitions
- the present invention relates to an etching method for etching a multilayer laminated film including a silicon oxide film layer and a silicon nitride film layer by using an etching gas containing a specific fluorine compound.
- Patent Document 1 includes at least one silicon oxide film layer and at least one silicon nitride film layer using a fluorinated hydrocarbon compound having 3 to 5 carbon atoms as an etching gas. There has been proposed a method of simultaneously etching both of the laminated films.
- 1,3,3,4,4,5,5-heptafluorocyclopentene (formula; C 5 HF 7 ), which is a cyclic compound having 5 carbon atoms, is a chain compound having 5 carbon atoms.
- 1,1,1,3,4,4,5,5,5-nonafluoro-2-pentene (formula; C 5 HF 9 ), a laminated film composed of one silicon oxide film and one silicon nitride film It is shown that the selectivity of the two-layer film with respect to the resist is increased and the pattern shape of the contact hole is improved.
- C 5 HF 7 which is an unsaturated fluorinated hydrocarbon compound used in the example of Patent Document 1
- a mask made of an organic film When a four-layered film in which silicon oxide film layers and silicon nitride film layers are alternately stacked is etched, the selectivity of the multilayered film with respect to the mask is low, and the contact hole may be blocked by the deposited film. I found out.
- the present invention has been made in view of the above-described prior art, and even in a multilayer laminated film of four or more layers, the contact hole is not blocked by the deposited film, and the high selectivity to the mask and the good pattern shape are obtained. It is an object of the present invention to provide an etching method capable of obtaining the above.
- the present inventors have intensively studied to solve the above problems. As a result, when a gas of a fluorinated hydrocarbon compound having 4 carbon atoms that does not have an unsaturated bond is used as an etching gas, the contact hole is not blocked by the deposited film even in a multilayer film having four or more layers. It has been found that high selectivity and a good pattern shape can be obtained, and the present invention has been completed.
- etching methods (1) to (5) are provided.
- An etching method characterized by the above.
- etching gas further includes one or more group 0 gases selected from the group consisting of helium, argon, neon, krypton, and xenon.
- group 0 gases selected from the group consisting of helium, argon, neon, krypton, and xenon.
- the chain saturated fluorinated hydrocarbon compound is 2-fluoro-n-butane (formula; C 4 H 9 F), 2,2-difluoro-n-butane (formula; C 4 H 8 F 2 ) 1,1,1,3,3, -pentafluoro-n-butane (formula; C 4 H 5 F 5 ), and 1,1,1,4,4,4-hexafluoro-n-butane (formula).
- the etching method according to (1) wherein the etching method is a compound selected from the group consisting of C 4 H 4 F 6 ).
- a contact hole having a high aspect ratio (hereinafter, simply referred to as “hole”) is formed in a multilayer laminated film
- the hole is not blocked by the deposited film, and the mask is highly selected. Therefore, it is possible to form a hole shape having a rectangular shape with a favorable side wall shape (a hole shape having no abnormal protrusion on the side wall and a smooth side wall), that is, etching with a good pattern shape.
- the etching method of the present invention is a method for simultaneously etching a multilayer laminated film including at least one silicon oxide film layer and at least one silicon nitride film layer by using an etching gas.
- the gas is a chain represented by the formula (1): CxHyFz (wherein x is 4, y and z are positive integers, y + z is 10 and y is 4 or more). It contains a saturated fluorinated hydrocarbon compound (hereinafter referred to as “fluorinated hydrocarbon compound (1)”).
- the multilayer laminated film that is the object to be processed of the etching method of the present invention includes at least one silicon oxide film layer and at least one silicon nitride film layer.
- a multilayer laminated film in which silicon oxide film layers and silicon nitride film layers are alternately laminated is preferable, and silicon oxide film layers and silicon nitride film layers to be etched are alternately arranged on a silicon substrate.
- a multilayer laminated film in which four or more layers are laminated is more preferable.
- a multilayer laminated film of a total of 128 layers in which 64 layers of silicon oxide film layers and silicon nitride film layers to be etched are alternately laminated on a silicon substrate.
- a high selectivity for a mask and a good pattern shape can be obtained without a contact hole being clogged with a deposited film even if the object to be processed is a multilayer laminated film having four or more layers.
- etching gas a gas containing the fluorinated hydrocarbon compound (1) is used as the etching gas.
- the content of the fluorinated hydrocarbon compound (1) in the total etching gas may be set to fall within the range of 1 to 20% by volume with respect to the total flow rate.
- saturated fluorinated hydrocarbons represented by the formula: C 4 H 9 F, such as 1-fluoro-n-butane, 2-fluoro-n-butane, 2-fluoro-2-methylpropane; 1,1-difluoro-n-butane, 1,2-difluoro-n-butane, 1,3-difluoro-n-butane, 1,4-difluoro-n-butane, 2,3-difluoro-n-butane, 2,2-difluoro-n-butane, 1,3-difluoro-2-methylpropane, 1,2-difluoro-2-methylpropane, 1,1-difluoro-2-methylpropane, and the like: C 4 H Saturated fluorinated hydrocarbon represented by 8 F 2 ;
- 2-fluoro-n-butane (formula: C 4 H 9 F), 2,2-difluoro-n-butane (formula: C 4 H 8 F) 2 ), 1,1,1,3,3, -pentafluoro-n-butane (formula: C 4 H 5 F 5 ) or 1,1,1,4,4,4-hexafluoro-n— Butane (formula: C 4 H 4 F 6 ) is preferred.
- the fluorinated hydrocarbon compound (1) can be used alone or in combination of two or more. Since the effect of the present invention appears more remarkably, it is preferably used alone.
- fluorinated hydrocarbon compounds (1) are known substances, and can be produced and obtained by known production methods.
- 2-fluoro-n-butane is described in J. Org. Org. Chem. , 44 (22), 3872 (1987), 2,2-difluoro-n-butane is obtained according to the methods described in JP-A Nos. 05-218992 and 06-1000047, etc.
- 1,1,3,3-pentafluoro-n-butane can be obtained by the methods described in JP-A Nos. 05-171185 and 08-198783, etc.
- Fluoro-n-butane can be produced and obtained by the methods described in JP-A Nos. 05-155788 and 08-003081, respectively.
- the fluorinated hydrocarbon compound (1) a commercially available one can be used as it is or after purification as desired.
- the fluorinated hydrocarbon compound (1) preferably has a high purity. By using a high-purity one, it becomes easier to obtain the effects of the present invention. If the purity of the fluorinated hydrocarbon compound (1) is too low, the gas purity (content of the fluorinated hydrocarbon compound (1)) may be biased in the gas-filled container. Specifically, the gas purity may be greatly different between the initial use stage and the stage where the remaining amount is low. In such a case, when dry etching is performed, there is a large difference in performance when using each gas in the initial stage of use and when the remaining amount is low, resulting in a decrease in yield on the factory production line. May be incurred. By improving the purity, there is no bias in the gas purity in the container, so there is no difference in performance when using gas between the initial use stage and the stage where the remaining amount is low, and the yield in the factory production line As a result, the gas can be used without waste.
- the fluorinated hydrocarbon compound (1) is filled in an arbitrary container, for example, a container such as a cylinder like the conventional semiconductor gas, and is used for etching described later.
- the etching gas used in the present invention preferably contains oxygen gas and / or nitrogen gas, and more preferably contains oxygen gas.
- oxygen gas and / or nitrogen gas in combination, it is possible to ensure high selectivity to the mask while preventing etching stop (etching stop) that is considered to be caused by deposition of reactants on the bottom surface of the hole.
- the high selectivity to the mask means that the ratio of the etching rate of the mask (the film that is not desired to be etched) and the multilayer laminated film (the film that is desired to be etched), that is, ((silicon oxide film and silicon nitride film It means that the value (selectivity) of (average etching rate) / mask etching rate) is high.
- the average etching rate of the silicon oxide film and the silicon nitride film is obtained by the following formula.
- the proportion of oxygen gas and / or nitrogen gas used is the total volume ratio of oxygen gas and / or nitrogen gas to the fluorinated hydrocarbon compound (1) ((total capacity of oxygen gas and / or nitrogen gas) / fluorine.
- the volume of the fluorinated hydrocarbon compound (1)) is preferably from 0.1 to 50, more preferably from 0.5 to 30.
- the etching gas further contains at least one group 0 gas selected from the group consisting of helium, argon, neon, krypton, and xenon.
- group 0 gas selected from the group consisting of helium, argon, neon, krypton, and xenon.
- helium or argon gas from the viewpoint of availability.
- the use ratio of the group 0 gas is 0.1 to 100 in terms of the volume ratio of the group 0 gas to the fluorinated hydrocarbon compound (1) (capacity of group 0 gas / volume of the fluorinated hydrocarbon compound (1)). Preferably, it is 0.5 to 50.
- etching refers to a technique for etching a very highly integrated fine pattern on an object to be processed used in a manufacturing process of a semiconductor manufacturing apparatus.
- etching is plasma etching.
- plasma etching means that a high frequency electric field is applied to an etching gas (reactive plasma gas) to cause a glow discharge to separate a gas compound into chemically active ions and radicals, and the chemical Etching using reaction.
- an etching gas is introduced into a processing chamber in which an object to be processed is installed, and then plasma is generated by a plasma generator to perform etching in a plasma atmosphere.
- the pressure in the processing chamber into which the etching gas is introduced is usually 0.0013 to 1300 Pa, preferably 0.13 to 13 Pa.
- the introduction rate of the fluorinated hydrocarbon compound (1) is preferably 1 to 50 sccm, more preferably 5 to 20 sccm.
- the introduction rate is preferably 0 to 200 sccm, more preferably 0 to 80 sccm.
- the introduction rate is preferably 0 to 1000 sccm, more preferably 0 to 400 sccm.
- Examples of the plasma generator include helicon wave type, high frequency induction type, parallel plate type, magnetron type, and microwave type devices. According to the plasma generator, it is possible to generate a plasma by generating a glow discharge by applying a high-frequency electric field to the fluorinated hydrocarbon compound (1) in the processing chamber.
- the plasma density is not particularly limited. From the viewpoint of better expressing the effects of the present invention, it is desirable to perform etching in a high-density plasma atmosphere with a plasma density of preferably 10 11 cm ⁇ 3 or more, more preferably 10 12 to 10 13 cm ⁇ 3. .
- the temperature reached by the substrate to be processed during etching is not particularly limited, but is preferably in the range of 0 to 300 ° C., more preferably 0 to 100 ° C., and still more preferably 0 to 80 ° C.
- the substrate temperature may or may not be controlled by cooling or the like.
- the multilayer laminated film is usually etched by providing a patterned mask on the upper part thereof.
- a patterned mask an organic film is usually used.
- an organic film an amorphous carbon film having high etching resistance is preferably used.
- the fluorinated hydrocarbon compound (1) since the fluorinated hydrocarbon compound (1) has high selectivity to the mask, four or more silicon oxide film layers and silicon nitride film layers are alternately laminated without destroying the mask. Even in the case of a multilayered film, etching with a favorable sidewall shape can be performed without blocking holes with a deposited film.
- Example 1 (I) Calculation of selectivity ratio A wafer in which a silicon oxide film (thickness 2000 nm) is formed on the silicon substrate surface in the etching chamber of the parallel plate type plasma etching apparatus, and a silicon nitride film (thickness 1000 nm) on the silicon substrate surface The formed wafer and the wafer having an amorphous carbon film (thickness 200 nm) formed on the surface of the silicon substrate were set. After the system was evacuated (2 Pa), 2-fluoro-n-butane (formula; C 4 H 9 F, referred to as fluorinated hydrocarbon compound (1-1) in Table 1 below) was fed at a rate of 10 sccm. Then, oxygen was introduced into the etching chamber at a rate of 30 sccm and argon at a rate of 200 sccm, and each wafer was etched under the etching conditions shown below.
- 2-fluoro-n-butane formula; C 4 H 9 F,
- the etching rate [nm / min] of the wafer on which the silicon oxide film is formed and the etching rate [nm / min] of the wafer on which the silicon nitride film is formed are obtained, and the average etching of the silicon oxide film and the silicon nitride film is obtained by the following formula.
- the speed [nm / min] was calculated.
- the etching rate [nm / min] of the amorphous carbon film (mask) was determined, and the ratio (selection ratio) of the average etching rate of the silicon oxide film and the silicon nitride film to the etching rate of the amorphous carbon film was determined.
- the results are shown in Table 1 below.
- Example 1 (Examples 2 to 4, Comparative Examples 1 to 5)
- Example 1 (i) except that the following fluorinated hydrocarbon compound was used instead of 2-fluoro-n-butane (formula; C 4 H 9 F), Etch wafers with silicon oxide film, silicon nitride film, and amorphous carbon film formed on the surface of silicon substrate, respectively, ratio of average etching rate of silicon oxide film and silicon nitride film to etching rate of amorphous carbon film (selection ratio) ) was calculated. Further, (ii) the four-layer laminated film wafer was etched, and the presence or absence of the mask (amorphous carbon film), the presence or absence of hole blocking, and the pattern shape after the etching were observed. The results are shown in Table 1 below.
- Comparative Example 2 since the etching rate of the silicon nitride film was higher than the etching rate of the silicon oxide film, the silicon nitride film was etched also in the horizontal direction, and the side wall shape was poor. Further, in Comparative Examples 4 and 5 using the fluorinated hydrocarbon compounds (5) and (6) having an unsaturated bond, the holes are blocked by the deposited film during the etching, and all the four-layer laminated film wafers are etched. I could not.
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Abstract
Description
(1)少なくとも1層のシリコン酸化膜層と、少なくとも1層のシリコン窒化膜層とを含む多層積層膜を、エッチングガスを用いて、両方同時にエッチングする方法であって、前記エッチングガスが、式(1):CxHyFz(式中、xは4、yは4以上の整数、zは正の整数、y+zは10である。)で表される鎖状飽和フッ素化炭化水素化合物を含むことを特徴とするエッチング方法。
(2)前記エッチングガスが、酸素ガスをさらに含むことを特徴とする(1)に記載のエッチング方法。
(3)前記エッチングガスが、ヘリウム、アルゴン、ネオン、クリプトン、及びキセノンからなる群より選択される0族ガスを、1種以上さらに含むことを特徴とする(2)に記載のエッチング方法。
(4)前記多層積層膜が、その上部に設けられた有機膜をマスクとして、エッチングされることを特徴とする(1)に記載のエッチング方法。
(5)前記鎖状飽和フッ素化炭化水素化合物が、2-フルオロ-n-ブタン(式;C4H9F)、2,2-ジフルオロ-n-ブタン(式;C4H8F2)、1,1,1,3,3,-ペンタフルオロ-n-ブタン(式;C4H5F5)、及び1,1,1,4,4,4-ヘキサフルオロ-n-ブタン(式;C4H4F6)からなる群より選択される化合物であることを特徴とする(1)に記載のエッチング方法。
本発明のエッチング方法は、少なくとも1層のシリコン酸化膜層と、少なくとも1層のシリコン窒化膜層とを含む多層積層膜を、エッチングガスを用いて、両方同時にエッチングする方法であって、前記エッチングガスが、式(1):CxHyFz(式中、xは4、yおよびzは正の整数を表し、y+zは10であり、かつyが4以上である。)で表される鎖状飽和フッ素化炭化水素化合物(以下、「フッ素化炭化水素化合物(1)」という。)を含むことを特徴とする。
本発明のエッチング方法の被処理体である多層積層膜は、少なくとも1層のシリコン酸化膜層と、少なくとも1層のシリコン窒化膜層とを含むものである。なかでも、多層積層膜としては、シリコン酸化膜層およびシリコン窒化膜層を交互に積層する多層積層膜が好ましく、シリコン基板上に、エッチング対象であるシリコン酸化膜層とシリコン窒化膜層とが交互に4層以上積層された多層積層膜がより好ましい。
具体的には、シリコン基板上にエッチング対象であるシリコン酸化膜層とシリコン窒化膜層とが交互に64層積層された合計128層の多層積層膜が挙げられる。
本発明のエッチング方法によれば、被処理体が4層以上の多層積層膜でも、コンタクトホールが堆積膜で閉塞されることなく、マスクに対する高い選択性と、良好なパターン形状とが得られる。
本発明においては、エッチングガスとして、フッ素化炭化水素化合物(1)を含むガスを用いる。
全エッチングガス中のフッ素化炭化水素化合物(1)の含有量は、総流量に対して、1~20容量%に入るように設定すればよい。
1,1-ジフルオロ-n-ブタン、1,2-ジフルオロ-n-ブタン、1,3-ジフルオロ-n-ブタン、1,4-ジフルオロ-n-ブタン、2,3-ジフルオロ-n-ブタン、2,2-ジフルオロ-n-ブタン、1,3-ジフルオロ-2-メチルプロパン、1,2-ジフルオロ-2-メチルプロパン、1,1-ジフルオロ-2-メチルプロパン等の、式:C4H8F2で表される飽和フッ素化炭化水素;
1,1,1,4,4,4-ヘキサフルオロ-n-ブタン、1,1,1,3,4,4-ヘキサフルオロ-n-ブタン、1,1,1,3,3,3-ヘキサフルオロ-2-メチルプロパン等の、式:C4H4F6で表される飽和フッ素化炭化水素;等が挙げられる。
また、本発明においては、フッ素化炭化水素化合物(1)として、市販されているものをそのままで、あるいは所望により精製して用いることもできる。
フッ素化炭化水素化合物(1)の純度が低すぎると、ガスを充填した容器内において、ガス純度(フッ素化炭化水素化合物(1)の含有量)の偏りを生じる場合がある。具体的には、使用初期段階と残量が少なくなった段階とでのガス純度が大きく異なることがある。
このような場合、ドライエッチングを行った際に、使用初期段階と、残量が少なくなった段階でそれぞれのガスを使用したときの性能に大きな差が生じ、工場の生産ラインにおいては歩留まりの低下を招くおそれがある。
純度を向上させることにより、容器内のガス純度の偏りがなくなるため、使用初期段階と残量が少なくなった段階とで、ガスを使用したときの性能に差がなくなり、工場の生産ラインにおいて歩留まりが向上し、ガスを無駄なく使用することが可能となる。
酸素ガス及び/又は窒素ガスを併用することにより、ホール底面における反応物の堆積等が原因と考えられるエッチングの停止(エッチングストップ)を防止しつつ、マスクに対する高い選択性を確保することができる。
シリコン酸化膜とシリコン窒化膜の平均エッチング速度は、下記式で求められる。
0族ガスを用いることにより、プラズマ密度を上げて、エッチング速度を上昇させることができる。
本発明のエッチング方法において、「エッチング」とは、半導体製造装置の製造工程等で用いられる被処理体に、極めて高集積化された微細パターンを食刻する技術をいう。また、エッチングの1例として、プラズマエッチングがある。ここで、「プラズマエッチング」とは、エッチングガス(反応性プラズマガス)に高周波の電場を印加してグロー放電を起こさせ、気体化合物を化学的に活性なイオン、ラジカルに分離させて、その化学反応を利用してエッチングを行うことをいう。
エッチングガスが導入された処理室内の圧力は、通常0.0013~1300Pa、好ましくは0.13~13Paである。
プラズマ発生装置によれば、処理室内のフッ素化炭化水素化合物(1)に高周波の電場を印加してグロー放電を起こさせ、プラズマを発生させることができる。
マスクとしては、通常有機膜を用いる。有機膜としては、耐エッチング性の高いアモルファスカーボン膜を用いるのが好ましい。
(i)選択比の算出
平行平板型プラズマエッチング装置のエッチングチャンバー内に、シリコン基板表面にシリコン酸化膜(厚さ2000nm)が形成されたウエハ、シリコン基板表面にシリコン窒化膜(厚さ1000nm)が形成されたウエハ、シリコン基板表面にアモルファスカーボン膜(厚さ200nm)が形成されたウエハを、それぞれセットした。
系内を真空(2Pa)にした後、2-フルオロ-n-ブタン(式;C4H9F、下記表1において、フッ素化炭化水素化合物(1-1)という。)を10sccmの速度で、酸素を30sccmの速度で、及びアルゴンを200sccmの速度でエッチングチャンバー内に導入し、下記に示すエッチング条件下で、それぞれのウエハにつきエッチングを行った。
上部電極の高周波電源の電力:300W
下部電極の高周波電源の電力:600W
電極温度:0℃
シリコン基板上に、第一のシリコン窒化膜(厚さ100nm)、第一のシリコン酸化膜(厚さ100nm)、第二のシリコン窒化膜(厚さ100nm)、第二のシリコン酸化膜(厚さ100nm)がこの順で積層された4層積層膜(多層積層膜)上に、所定のホールパターンがパターニングされたアモルファスカーボン膜層が形成されたウエハを、前記(i)と同様の方法によりエッチングした。
実施例1において、2-フルオロ-n-ブタン(式;C4H9F)の代わりに、下記に示すフッ素化炭化水素化合物を用いた以外は、実施例1と同様にして、(i)シリコン基板表面に、シリコン酸化膜、シリコン窒化膜、アモルファスカーボン膜が形成されたウエハをそれぞれエッチングし、アモルファスカーボン膜のエッチング速度に対する、シリコン酸化膜とシリコン窒化膜の平均エッチング速度の比(選択比)を算出した。さらに、(ii)4層積層膜ウエハをエッチングし、エッチング後の、マスク(アモルファスカーボン膜)の消失の有無、ホール閉塞の有無、及びパターン形状を観察した。その結果を下記表1に示す。
・フッ素化炭化水素化合物(1-3):1,1,1,3,3,-ペンタフルオロ-n-ブタン(式;C4H5F5)
・フッ素化炭化水素化合物(1-4):1,1,1,4,4,4-ヘキサフルオロ-n-ブタン(式;C4H4F6)
・フッ素化炭化水素化合物(2):ジフルオロメタン(式;CH2F2)
・フッ素化炭化水素化合物(3):1,1,1,2,2,3,4,4,4-ノナフルオロブタン(式;C4HF9)
・フッ素化炭化水素化合物(4):パーフルオロシクロブタン(式;C4F8)
・フッ素化炭化水素化合物(5):ヘキサフルオロ-1,3-ブタジエン(式;C4F6)
・フッ素化炭化水素化合物(6):1,3,3,4,4,5,5-ヘプタフルオロシクロペンテン(式;C5HF7)
一方、エッチングガスとして、フッ素化炭化水素化合物(2)~(4)を用いた比較例1~3では、選択比が低いため、エッチング後、アモルファスカーボン膜が消失し、アモルファスカーボン膜によってマスキングされていた部分の第二のシリコン酸化膜もエッチングされていた。比較例2では、シリコン酸化膜のエッチング速度に対して、シリコン窒化膜のエッチング速度が高いために、シリコン窒化膜が水平方向にもエッチングされ、側壁形状も悪かった。
また、不飽和結合を有するフッ素化炭化水素化合物(5)、(6)を用いた比較例4、5では、エッチング中にホールが堆積膜で閉塞され、4層積層膜ウエハをすべてエッチングすることができなかった。
Claims (5)
- 少なくとも1層のシリコン酸化膜層と、少なくとも1層のシリコン窒化膜層とを含む多層積層膜を、エッチングガスを用いて、両方同時にエッチングする方法において、前記エッチングガスとして、式(1):CxHyFz(式中、xは4、yは4以上の整数、zは正の整数、y+zは10である。)で表される鎖状飽和フッ素化炭化水素化合物を含むことを特徴とするエッチング方法。
- 前記エッチングガスが、酸素ガスをさらに含むことを特徴とする請求項1に記載のエッチング方法。
- 前記エッチングガスが、ヘリウム、アルゴン、ネオン、クリプトン、及びキセノンからなる群より選択される0族ガスを、1種以上さらに含むことを特徴とする請求項2に記載のエッチング方法。
- 前記多層積層膜が、その上部に設けられた有機膜をマスクとして、エッチングされることを特徴とする請求項1に記載のエッチング方法。
- 前記鎖状飽和フッ素化炭化水素化合物が、2-フルオロ-n-ブタン(式;C4H9F)、2,2-ジフルオロ-n-ブタン(式;C4H8F2)、1,1,1,3,3-ペンタフルオロ-n-ブタン(式;C4H5F5)、及び1,1,1,4,4,4-ヘキサフルオロ-n-ブタン(式;C4H4F6)からなる群より選択される化合物であることを特徴とする請求項1に記載のエッチング方法。
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| JP2014554589A JPWO2014104290A1 (ja) | 2012-12-27 | 2013-12-27 | ドライエッチング方法 |
| CN201380068003.2A CN104871298A (zh) | 2012-12-27 | 2013-12-27 | 干蚀刻方法 |
| KR1020157013220A KR20150099515A (ko) | 2012-12-27 | 2013-12-27 | 드라이 에칭 방법 |
| US14/655,861 US20150357200A1 (en) | 2012-12-27 | 2013-12-27 | Dry etching method |
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| WO2015064550A1 (ja) * | 2013-10-30 | 2015-05-07 | 日本ゼオン株式会社 | 高純度フッ素化炭化水素、プラズマエッチング用ガスとしての使用、及び、プラズマエッチング方法 |
| JP2016149451A (ja) * | 2015-02-12 | 2016-08-18 | 関東電化工業株式会社 | ドライエッチングガス組成物及びドライエッチング方法 |
| CN106298502A (zh) * | 2015-05-18 | 2017-01-04 | 中微半导体设备(上海)有限公司 | 一种利用等离子体对多层材料刻蚀的方法 |
| US10090168B2 (en) | 2015-01-22 | 2018-10-02 | Zeon Corporation | Plasma etching method |
| WO2018186364A1 (ja) * | 2017-04-06 | 2018-10-11 | 関東電化工業株式会社 | ドライエッチングガス組成物及びドライエッチング方法 |
| US10431472B2 (en) | 2016-10-13 | 2019-10-01 | Kanto Denka Kogyo Co., Ltd. | Gas composition for dry etching and dry etching method |
| WO2020054200A1 (ja) * | 2018-09-11 | 2020-03-19 | キオクシア株式会社 | 半導体装置の製造方法およびエッチングガス |
| KR20220122260A (ko) | 2021-02-26 | 2022-09-02 | 에스케이스페셜티 주식회사 | 실리콘 함유막의 다중 적층체의 식각 방법 및 이를 포함하는 반도체 디바이스의 제조방법 |
| KR20220126045A (ko) | 2021-03-08 | 2022-09-15 | 에스케이스페셜티 주식회사 | 실리콘 함유막의 다중 적층체의 식각 방법 및 이를 포함하는 반도체 디바이스의 제조방법 |
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| US7964512B2 (en) * | 2005-08-22 | 2011-06-21 | Applied Materials, Inc. | Method for etching high dielectric constant materials |
| JP5701654B2 (ja) * | 2011-03-23 | 2015-04-15 | 東京エレクトロン株式会社 | 基板処理方法 |
| US8765613B2 (en) * | 2011-10-26 | 2014-07-01 | International Business Machines Corporation | High selectivity nitride etch process |
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- 2013-12-27 CN CN201380068003.2A patent/CN104871298A/zh active Pending
- 2013-12-27 US US14/655,861 patent/US20150357200A1/en not_active Abandoned
- 2013-12-27 JP JP2014554589A patent/JPWO2014104290A1/ja active Pending
- 2013-12-27 WO PCT/JP2013/085091 patent/WO2014104290A1/ja not_active Ceased
- 2013-12-27 KR KR1020157013220A patent/KR20150099515A/ko not_active Ceased
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| WO2009123038A1 (ja) * | 2008-03-31 | 2009-10-08 | 日本ゼオン株式会社 | プラズマエッチング方法 |
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| JP7173799B2 (ja) | 2018-09-11 | 2022-11-16 | キオクシア株式会社 | 半導体装置の製造方法およびエッチングガス |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20150099515A (ko) | 2015-08-31 |
| US20150357200A1 (en) | 2015-12-10 |
| JPWO2014104290A1 (ja) | 2017-01-19 |
| CN104871298A (zh) | 2015-08-26 |
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