JP2009099938A - Method and apparatus for manufacturing semiconductor device, control program, and program recording medium - Google Patents
Method and apparatus for manufacturing semiconductor device, control program, and program recording medium Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0337—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0338—Process specially adapted to improve the resolution of the mask
Abstract
Description
本発明は、フォトレジスト膜を露光、現像して得られたフォトレジストの第1パターンに基づいて、基板上の被エッチング層を所定のパターンにエッチングして、半導体装置を製造する半導体装置の製造方法、半導体装置の製造装置、制御プログラム及びプログラム記憶媒体に関する。 The present invention provides a semiconductor device for manufacturing a semiconductor device by etching an etching target layer on a substrate into a predetermined pattern based on a first pattern of a photoresist obtained by exposing and developing a photoresist film. The present invention relates to a method, a semiconductor device manufacturing apparatus, a control program, and a program storage medium.
従来から、半導体装置等の製造工程においては、半導体ウエハ等の基板にプラズマエッチング等のエッチング処理を施して、微細な回路パターン等を形成することが行われている。このようなエッチング処理工程では、フォトレジストを用いたフォトリソグラフィー工程によって、エッチングマスクを形成することが行われている。 Conventionally, in a manufacturing process of a semiconductor device or the like, a fine circuit pattern or the like is formed by performing an etching process such as plasma etching on a substrate such as a semiconductor wafer. In such an etching process, an etching mask is formed by a photolithography process using a photoresist.
このようなフォトリソグラフィー工程では、形成するパターンの微細化に対応するため、種々の技術が開発されている。その一つとして、所謂ダブルパターニングがある。このダブルパターニングは、第1のマスクパターン形成ステップと、この第1のマスクパターン形成ステップの後に行われる第2のマスクパターン形成ステップの2段階のパターニングを行うことによって、1回のパターニングでエッチングマスクを形成する場合より微細な間隔のエッチングマスクを形成できるようにしたものである(例えば、特許文献1参照。)。 In such a photolithography process, various techniques have been developed to cope with the miniaturization of a pattern to be formed. One of them is so-called double patterning. This double patterning is performed by performing a two-step patterning of a first mask pattern forming step and a second mask pattern forming step performed after the first mask pattern forming step, thereby performing an etching mask in one patterning. An etching mask with a finer interval can be formed (see, for example, Patent Document 1).
また、例えばSiO2膜やSi3N4膜等を犠牲膜として使用し、1つパターンの両側側壁部分にマスクを形成して使用するSWT(side wall transfer)法を用いて、最初にフォトレジスト膜を露光、現像して得られたフォトレジストのパターンよりも微細なピッチでパターニングを行うことも知られている。すなわち、この方法では、まずフォトレジストのパターンを用いて例えばSiO2膜の犠牲膜をエッチングしてパターニングし、このSiO2膜のパターンの上にSi3N4膜等を形成した後、SiO2膜の側壁部分にのみSi3N4膜が残るようにエッチバックし、この後、ウエットエッチングによりSiO2膜を除去して、残ったSi3N4膜をマスクとして、下層のエッチングを行うものである。 In addition, for example, an SiO 2 film, Si 3 N 4 film or the like is used as a sacrificial film, and a mask is formed on both side wall portions of one pattern to use a SWT (side wall transfer) method. It is also known to perform patterning at a finer pitch than the pattern of a photoresist obtained by exposing and developing a film. That is, in this method, first etching for example the sacrificial layer of SiO 2 film by using a pattern of photoresist is patterned by, after an Si 3 N 4 film or the like on the pattern of the SiO 2 film, SiO 2 Etch back so that the Si 3 N 4 film remains only on the side wall of the film, and then remove the SiO 2 film by wet etching, and etch the lower layer using the remaining Si 3 N 4 film as a mask It is.
また、成膜技術においては、より低温で成膜することが要求される場合があり、このように低温で成膜する技術としては、加熱触媒体で成膜ガスを活性化させた化学気相成長によって行う方法が知られている(例えば、特許文献2参照。)。
上記したとおり、従来技術においては、工程数が多くなり、工程が複雑化するとともに製造コストが増大し、生産性が悪化するという課題がある。また、従来のSWT法では、ウエットエッチング工程が必要であるため、ドライエッチングとウエットエッチングが混在する工程となり、工程が煩雑化する要因となっている。 As described above, in the prior art, there are problems that the number of steps increases, the steps become complicated, the manufacturing cost increases, and the productivity deteriorates. In addition, since the conventional SWT method requires a wet etching process, it is a process in which dry etching and wet etching are mixed, which is a factor that complicates the process.
本発明は、かかる従来の事情に対処してなされたもので、従来に比べて工程の簡略化と製造コストの低減を図ることができ、生産性の向上を図ることのできる半導体装置の製造方法、半導体装置の製造装置、制御プログラム及びプログラム記憶媒体を提供しようとするものである。 The present invention has been made in response to such a conventional situation, and a method of manufacturing a semiconductor device capable of simplifying the process and reducing the manufacturing cost and improving the productivity as compared with the conventional case. An object of the present invention is to provide a semiconductor device manufacturing apparatus, a control program, and a program storage medium.
請求項1の半導体装置の製造方法は、フォトレジスト膜を露光、現像して得られたフォトレジストの第1パターンに基づいて、基板上の被エッチング層を所定のパターンにエッチングして、半導体装置を製造する半導体装置の製造方法であって、前記フォトレジストの第1パターンの上にSiO2膜を成膜する成膜工程と、前記SiO2膜を前記フォトレジストの第1パターンの側壁部にのみ残るようにエッチングするエッチング工程と、前記フォトレジストの第1パターンを除去して前記SiO2膜の第2パターンを形成する第2パターン形成工程と、を具備したことを特徴とする。 According to a first aspect of the present invention, there is provided a method of manufacturing a semiconductor device by etching a layer to be etched on a substrate into a predetermined pattern based on a first pattern of a photoresist obtained by exposing and developing a photoresist film. A method of manufacturing a semiconductor device, comprising: forming a SiO 2 film on a first pattern of the photoresist; and depositing the SiO 2 film on a sidewall portion of the first pattern of the photoresist. An etching process for etching so as to remain only, and a second pattern forming process for forming a second pattern of the SiO 2 film by removing the first pattern of the photoresist.
請求項2の半導体装置の製造方法は、請求項1記載の半導体装置の製造方法であって、前記成膜工程を、加熱触媒体で成膜ガスを活性化させた化学気相成長によって行うことを特徴とする。
A method for manufacturing a semiconductor device according to claim 2 is the method for manufacturing a semiconductor device according to
請求項3の半導体装置の製造方法は、請求項1又は2記載の半導体装置の製造方法であって、前記成膜工程の前に、前記フォトレジストの第1パターンをトリミングするとともに、下層の有機材料からなる反射防止膜をエッチングする工程を具備したことを特徴とする。
The method for manufacturing a semiconductor device according to claim 3 is the method for manufacturing a semiconductor device according to
請求項4の半導体装置の製造方法は、請求項1〜3いずれか1項記載の半導体装置の製造方法であって、前記第2パターン形成工程の後、当該第2パターンをマスクとして下層のシリコン層又は窒化シリコン層又は酸窒化シリコン層をエッチングすることを特徴とする。
The method for manufacturing a semiconductor device according to claim 4 is the method for manufacturing a semiconductor device according to any one of
請求項5の半導体装置の製造方法は、請求項1又は2記載の半導体装置の製造方法であって、前記第2パターン形成工程の後に、当該第2パターンをマスクとして下層の無機材料からなる反射防止膜をエッチングし、この後、前記無機材料からなる反射防止膜の下層の有機膜をエッチングする工程を具備したことを特徴とする。
The method for manufacturing a semiconductor device according to claim 5 is the method for manufacturing a semiconductor device according to
請求項6の半導体装置の製造方法は、請求項5記載の半導体装置の製造方法であって、前記無機材料からなる反射防止膜が、SOG(Spin On Glass)膜、LTO(Low Temperature Oxide)膜、SiON膜のいずれかであることを特徴とする。 6. The method of manufacturing a semiconductor device according to claim 6, wherein the antireflection film made of an inorganic material is an SOG (Spin On Glass) film or an LTO (Low Temperature Oxide) film. Or a SiON film.
請求項7の半導体装置の製造方法は、基板上の被エッチング層を所定のパターンにエッチングして、半導体装置を製造する半導体装置の製造方法であって、フォトレジストからなる複数のライン状の第1パターンを形成する第1パターン形成工程と、前記第1パターンの上にSiO2膜を成膜する第1成膜工程と、前記SiO2膜を前記フォトレジストの第1パターンの側壁部にのみ残るようにエッチングする第1エッチング工程と、前記第1パターンを除去して前記SiO2膜の第2パターンを形成する第2パターン形成工程と、前記第2パターンをマスクとして下層の第1マスク構成層をエッチングする第2エッチング工程と、前記第1パターンと直交する方向に、フォトレジストの複数のライン状のパターンからなる第3パターンを形成する工程と、前記第3パターンの上にSiO2膜を成膜する第2成膜工程と、前記SiO2膜を前記第3パターンの側壁部にのみ残るようにエッチングする第3エッチング工程と、前記第3パターンを除去して前記SiO2膜の第4パターンを形成する第4パターン形成工程と、前記第4パターン及び前記第1マスク構成層をマスクとして、下層の第2マスク構成層をエッチングする第4エッチング工程と、前記第1マスク構成層と前記第2マスク構成層をマスクとして、前記被エッチング層にホール形状を形成する第5エッチング工程とを具備したことを特徴とする。 A method of manufacturing a semiconductor device according to claim 7 is a method of manufacturing a semiconductor device by etching a layer to be etched on a substrate into a predetermined pattern, wherein a plurality of line-shaped first layers made of photoresist are formed. a first pattern formation step of forming a pattern, a first film forming step of forming a SiO 2 film on the first pattern, only the SiO 2 film on the side wall portion of the first pattern of the photoresist A first etching step for etching so as to remain; a second pattern forming step for removing the first pattern to form a second pattern of the SiO 2 film; and a first mask configuration in a lower layer using the second pattern as a mask A second etching step for etching the layer, and a third pattern composed of a plurality of line-like patterns of photoresist in a direction orthogonal to the first pattern And that step, a second film forming step of forming a SiO 2 film on the third pattern, and a third etching step of etching the SiO 2 film so as to remain only on the sidewalls of the third pattern, A fourth pattern forming step of removing the third pattern to form a fourth pattern of the SiO 2 film; and etching the second mask constituent layer below using the fourth pattern and the first mask constituent layer as a mask And a fifth etching step of forming a hole shape in the etched layer using the first mask constituent layer and the second mask constituent layer as a mask.
請求項8の半導体装置の製造方法は、請求項7記載の半導体装置の製造方法であって、前記第1及び第2成膜工程を、加熱触媒体で成膜ガスを活性化させた化学気相成長によって行うことを特徴とする。 A method for manufacturing a semiconductor device according to claim 8 is the method for manufacturing a semiconductor device according to claim 7, wherein the first and second film forming steps are performed by using a heating catalyst body to activate a film forming gas. It is performed by phase growth.
請求項9の半導体装置の製造方法は、請求項7又は8記載の半導体装置の製造方法であって、前記第1成膜工程の前に、前記第1パターンをトリミングするとともに、下層の有機材料からなる反射防止膜をエッチングする工程と、前記第1成膜工程の前に、前記第3パターンをトリミングするとともに、下層の有機材料からなる反射防止膜をエッチングする工程とを具備したことを特徴とする。 A method for manufacturing a semiconductor device according to claim 9 is the method for manufacturing a semiconductor device according to claim 7 or 8, wherein the first pattern is trimmed before the first film forming step, and an organic material in a lower layer is trimmed. And a step of trimming the third pattern and etching the antireflection film made of an underlying organic material before the first film formation step. And
請求項10の半導体装置の製造方法は、請求項7〜9いずれか1項記載の半導体装置の製造方法であって、前記第1マスク構成層がシリコンからなり、前記第2マスク構成層が窒化シリコンからなることを特徴とする。
The method for manufacturing a semiconductor device according to
請求項11の半導体装置の製造装置は、基板上の被エッチング層を所定のパターンにエッチングして、半導体装置を製造する半導体装置の製造装置であって、前記基板を収容する処理チャンバーと、前記処理チャンバー内に処理ガスを供給する処理ガス供給手段と、前記処理チャンバー内で請求項1から請求項10いずれか1項記載の半導体装置の製造方法が行われるように制御する制御部とを備えたことを特徴とする。
The semiconductor device manufacturing apparatus according to
請求項12の制御プログラムは、コンピュータ上で動作し、実行時に、請求項1から請求項10いずれか1項記載の半導体装置の製造方法が行われるよう半導体装置の製造装置を制御することを特徴とする。 A control program according to a twelfth aspect of the present invention operates on a computer and controls a semiconductor device manufacturing apparatus so that the semiconductor device manufacturing method according to any one of the first to tenth aspects is performed at the time of execution. And
請求項13のプログラム記憶媒体は、コンピュータ上で動作する制御プログラムが記憶されプログラム記憶媒体であって、前記制御プログラムは、実行時に請求項1から請求項10いずれか1項記載の半導体装置の製造方法が行われるように半導体装置の製造装置を制御することを特徴とする。
The program storage medium according to
本発明によれば、従来に比べて工程の簡略化と製造コストの低減を図ることができ、生産性の向上を図ることのできる半導体装置の製造方法、半導体装置の製造装置、制御プログラム及びプログラム記憶媒体を提供することができる。 According to the present invention, a method of manufacturing a semiconductor device, a manufacturing apparatus of a semiconductor device, a control program, and a program capable of simplifying the process and reducing the manufacturing cost and improving the productivity as compared with the prior art. A storage medium can be provided.
以下、本発明の一実施形態について図面を参照して説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
図1は、本発明の第1実施形態に係る半導体ウエハの一部を拡大して模式的に示し、第1実施形態にかかる半導体装置の製造方法の工程を示すものである。図1(a)に示すように、この第1実施形態では、パターニングを目的とする被エッチング層としてのポリシリコン層101の上には、有機材料からなる反射防止膜(BARC)102が形成されており、この反射防止膜(BARC)102の上にフォトレジスト103が形成されている。フォトレジスト103は、露光、現像工程により、パターニングされ、所定形状を有するパターンとされている。なお、図1において100は、ポリシリコン層101の下側に設けられた下地層を示している。
FIG. 1 schematically shows an enlarged part of a semiconductor wafer according to a first embodiment of the present invention, and shows the steps of a method for manufacturing a semiconductor device according to the first embodiment. As shown in FIG. 1A, in the first embodiment, an antireflection film (BARC) 102 made of an organic material is formed on a
図1(b)は、上記のフォトレジスト103をトリミングして線幅を細くするとともに、反射防止膜(BARC)102をエッチングした状態を示している。このフォトレジスト103のトリミング及び反射防止膜(BARC)102のエッチングを行う工程は、例えば、酸素プラズマ等を用いたプラズマエッチングにより行うことができる。
FIG. 1B shows a state in which the
次に、図1(c)に示すように、SiO2膜104を成膜する。この成膜工程では、フォトレジスト103の上に成膜を行うが、一般的にフォトレジスト103は、高温に晒されると倒れを生じる等、高温に弱いので、低温(例えば300℃以下程度)で成膜することが好ましい。この場合、加熱触媒体で成膜ガスを活性化させた化学気相成長によって行うことができる。
Next, as shown in FIG. 1C, a SiO 2
次に、図1(d)に示すように、SiO2膜104をエッチングし、SiO2膜104が、フォトレジスト103のパターンの側壁部にのみ残った状態とする。このエッチングは、例えば、CF4、C4F8、CHF3、CH3F、CH2F2等のCF系ガスと、Arガス等の混合ガス、またはこの混合ガスに必要に応じて酸素を添加したガス等を用いて行うことができる。
Next, as shown in FIG. 1D, the SiO 2 film 104 is etched so that the SiO 2 film 104 remains only on the side wall portion of the pattern of the
次に、図1(e)に示すように、酸素プラズマを用いたアッシング等により、フォトレジスト103のパターンを除去し、側壁部に残ったSiO2膜104によるパターンを形成する。
Next, as shown in FIG. 1E, the pattern of the
そして、図1(f)に示すように、上記のSiO2膜104によるパターンをマスクとして、下層のポリシリコン層101をエッチングする。このエッチングは、例えば、HBrガス等を用いて行うことができる。
Then, as shown in FIG. 1F, the
上記の第1実施形態では、犠牲膜を用いることなく、SWT法による微細なパターンの形成を行うことができる。また、工程の途中でウエットエッチングを行うことなく、エッチング工程は全てドライエッチング工程によって実施できる。したがって、従来に比べて工程の簡略化と製造コストの低減を図ることができ、生産性の向上を図ることができる。 In the first embodiment, a fine pattern can be formed by the SWT method without using a sacrificial film. In addition, the entire etching process can be performed by a dry etching process without performing wet etching in the middle of the process. Therefore, the process can be simplified and the manufacturing cost can be reduced as compared with the conventional case, and the productivity can be improved.
実際に、図1(c)に示す工程で加熱触媒体で成膜ガスを活性化させた化学気相成長によって厚さ約35nmのSiO2膜104を成膜し、対向電極の上部電極と下部電極とに高周波電力を供給してプラズマエッチングを行う装置を用い、以下の条件で各工程のエッチングを行ったところ、ポリシリコン層101(厚さ約100nm(下地層が酸化膜))を良好な形状にパターニングすることができた。
(図1(b),(e)のフォトレジスト103、反射防止膜102のエッチング)
エッチングガス:O2(374sccm)
圧力:13.3Pa(100mTorr)
電力:600W(上部)/30W(下部)
(図1(d)のSiO2膜104のエッチング)
エッチングガス:Ar/C4F8(500sccm/20sccm)
圧力:5.3Pa(40mTorr)
電力:600W(上部)/100W(下部)
(図1(f)のポリシリコン層101のエッチング)
(メインエッチング)
エッチングガス:HBr/O2(400sccm/2sccm)
圧力:4.0Pa(30mTorr)
電力:200W(上部)/150W(下部)
(オーバーエッチング)
エッチングガス:HBr/O2(934sccm/4sccm)
圧力:20.0Pa(150mTorr)
電力:650W(上部)/200W(下部)
Actually, an SiO 2 film 104 having a thickness of about 35 nm is formed by chemical vapor deposition in which the film forming gas is activated by the heating catalyst in the step shown in FIG. Using an apparatus that performs plasma etching by supplying high-frequency power to the electrodes, etching of each step was performed under the following conditions. As a result, the polysilicon layer 101 (thickness of about 100 nm (underlayer is an oxide film)) was excellent. The pattern could be patterned.
(Etching of the
Etching gas: O 2 (374 sccm)
Pressure: 13.3 Pa (100 mTorr)
Power: 600W (upper part) / 30W (lower part)
(Etching of SiO 2 film 104 in FIG. 1D)
Etching gas: Ar / C 4 F 8 (500 sccm / 20 sccm)
Pressure: 5.3 Pa (40 mTorr)
Power: 600W (upper part) / 100W (lower part)
(Etching of
(Main etching)
Etching gas: HBr / O 2 (400 sccm / 2 sccm)
Pressure: 4.0 Pa (30 mTorr)
Power: 200W (top) / 150W (bottom)
(Over-etching)
Etching gas: HBr / O 2 (934 sccm / 4 sccm)
Pressure: 20.0 Pa (150 mTorr)
Power: 650W (upper part) / 200W (lower part)
図2は、上記した第1実施形態におけるポリシリコン層101と反射防止膜(BARC)102との間に、他の膜、例えばSi3N4膜120が形成されている第2実施形態の半導体装置の製造工程を示すものである。この第2実施形態の場合、図1に示した第1実施形態の場合と同様にして図2(a)〜(e)の工程を行う。そしてこの後、SiO2膜104によるパターンをマスクとして、下層のSi3N4膜120をエッチングし(f)、このSi3N4膜120等をマスクとしてポリシリコン層101をエッチングする(g)。なお、図2の場合において、Si3N4膜120に代えてSiON(酸窒化シリコン)膜を用いてもよい。
FIG. 2 shows a semiconductor according to the second embodiment in which another film, for example, a Si 3 N 4 film 120 is formed between the
図3は、第3実施形態の半導体装置の製造方法の工程を示すものである。図3(a)に示すように、この第3実施形態では、例えば、酸化膜、窒化膜、ポリシリコン等からなり、パターニングを目的とする被エッチング層131の上には、有機膜132が形成されており、この有機膜132の上に、無機材料からなる反射防止膜としてSOG膜(又はLTO膜)133が形成されており、このSOG膜(又はLTO膜)133の上にフォトレジスト134が形成されている。フォトレジスト134は、露光、現像工程により、パターニングされ、所定形状を有するパターンとされている。
FIG. 3 shows the steps of the semiconductor device manufacturing method according to the third embodiment. As shown in FIG. 3A, in the third embodiment, for example, an
図3(b)は、上記のフォトレジスト134をトリミングして線幅を細くした状態を示している。このフォトレジスト134のトリミングを行う工程は、例えば、酸素プラズマ等を用いたプラズマエッチングにより行うことができる。なお、このトリミング工程は、必要に応じて行うものであり、フォトレジスト134が所望の線幅となっている場合は、省略される。
FIG. 3B shows a state where the
次に、図3(c)に示すように、SiO2膜135を成膜する。この成膜工程では、フォトレジスト134の上に成膜を行うため、前述したように、低温(例えば300℃以下程度)で成膜することが好ましく、加熱触媒体で成膜ガスを活性化させた化学気相成長等によって行うことができる。
Next, as shown in FIG. 3C, a SiO 2 film 135 is formed. In this film forming process, since the film is formed on the
次に、図3(d)に示すように、SiO2膜135をエッチングし、SiO2膜135が、フォトレジスト134のパターンの側壁部にのみ残った状態とする。このエッチングは、例えば、CF4、C4F8、CHF3、CH3F、CH2F2等のCF系ガスと、Arガス等の混合ガス、またはこの混合ガスに必要に応じて酸素を添加したガス等を用いて行うことができる。
Next, as shown in FIG. 3D, the SiO 2 film 135 is etched so that the SiO 2 film 135 remains only on the side wall portion of the pattern of the
次に、図3(e)に示すように、酸素プラズマを用いたアッシング等により、フォトレジスト134のパターンを除去し、側壁部に残ったSiO2膜135によるパターンを形成する。
Next, as shown in FIG. 3E, the pattern of the
この後、図3(f)に示すように、上記のSiO2膜135によるパターンをマスクとして、下層のSOG膜(又はLTO膜)133をエッチングし、さらに、図3(g)に示すように、下層の有機膜132をエッチングする。そして、パターニングされた有機膜132を含むマスクを介して下層の被エッチング層131をエッチングする。この場合被エッチング層131は、ポリシリコン等の他、酸化膜、窒化膜等の無機材料からなる膜であってもよい。なお、SOG膜(又はLTO膜)133のエッチングは、前述したCF系ガス等からなる混合ガスを用いて行うことができ、有機膜132のエッチングは、酸素又は窒素等のガスを用いて行うことができる。
Thereafter, as shown in FIG. 3 (f), the underlying SOG film (or LTO film) 133 is etched using the pattern of the SiO 2 film 135 as a mask, and further, as shown in FIG. 3 (g). Then, the lower
図4は、上記した第3実施形態におけるSOG膜(又はLTO膜)133の代わりに反射防止膜としてSiON膜140が形成されている第4実施形態の半導体装置の製造工程を示すものである。この第4実施形態の場合、図3に示した第3実施形態の場合の図3(a)〜(g)の工程と同様にして図4(a)〜(g)の工程を行う。
FIG. 4 shows a manufacturing process of the semiconductor device of the fourth embodiment in which the
次に、図6乃至10を参照して、第5実施形態について説明する。図6(a)に示すように、この第5実施形態では、パターニングを目的とする被エッチング層としての酸化シリコン層500の上には、第2マスク構成層としての窒化シリコン層501が形成されている。この窒化シリコン層501の上には、第1マスク構成層としてのアモルファスシリコン層502が形成されている。このアモルファスシリコン層502は、ポリシリコン層であってもよい。このアモルファスシリコン層502の上に、有機材料からなる反射防止膜(BARC)503が形成されている。そして、この反射防止膜(BARC)503の上にフォトレジスト504が形成されている。フォトレジスト504は、露光、現像工程により、パターニングされ、複数のライン形状を有する所定パターン(第1パターン)とされている。このフォトレジスト504のライン形状のパターンは、例えば、ラインの幅(線幅)が60nm、ラインとラインとの間の間隔が60nm等とされる。
Next, a fifth embodiment will be described with reference to FIGS. As shown in FIG. 6A, in the fifth embodiment, a
図6(b)は、上記のフォトレジスト504をトリミングして線幅を細くする(例えば、30nmとする)とともに、反射防止膜(BARC)503をエッチングした状態を示している。このフォトレジスト504のトリミング及び反射防止膜(BARC)503のエッチングを行う工程は、例えば、酸素プラズマ等を用いたプラズマエッチングにより行うことができる。
FIG. 6B shows a state in which the
次に、図6(c)に示すように、フォトレジスト504の上に、SiO2膜505を成膜する第1成膜工程を行う。この成膜工程は、前述した実施形態と同様に、加熱触媒体で成膜ガスを活性化させた化学気相成長等によって行う。
Next, as shown in FIG. 6C, a first film forming step for forming a SiO 2 film 505 on the
次に、図6(d)に示すように、SiO2膜505をエッチングし、SiO2膜505が、フォトレジスト504のパターンの側壁部にのみ残った状態とする第1エッチング工程を行う。このエッチングは、例えば、CF4、C4F8、CHF3、CH3F、CH2F2等のCF系ガスと、Arガス等の混合ガス、またはこの混合ガスに必要に応じて酸素を添加したガス等を用いて行うことができる。
Next, as shown in FIG. 6D, a first etching step is performed in which the SiO 2 film 505 is etched so that the SiO 2 film 505 remains only on the sidewalls of the
次に、図6(e)に示すように、酸素プラズマを用いたアッシング等により、フォトレジスト504のパターンを除去して、側壁部に残ったSiO2膜505によるパターン(第2パターン)を形成する第2パターン形成工程を行い、このSiO2膜505によるパターンをマスクとしてアモルファスシリコン層502をエッチングする第2エッチング工程を行う。アモルファスシリコン層502のエッチングは、例えば、HBrガス等を用いて行うことができる。
Next, as shown in FIG. 6E, the pattern of the
そして、図6(f)に示すように、エッチングマスクとして使用したSiO2膜505を除去する。以上の工程によって、図7の平面図に示すように、半導体ウエハを上から見たときに、アモルファスシリコン層502がライン状(線幅例えば30nm、間隔例えば30nm)に形成され、これらのアモルファスシリコン層502の間に、下層の窒化シリコン層501が露出した状態となる。なお、図6(f)は、図7の一点鎖線で示すA断面の断面図である。
Then, as shown in FIG. 6F, the SiO 2 film 505 used as an etching mask is removed. Through the above steps, as shown in the plan view of FIG. 7, when the semiconductor wafer is viewed from above, the
次に、上記した図6(f)の状態から、図8(B1)、(C1)に示すように、反射防止膜(BARC)513を形成し、その上に塗布、露光、現像工程によってパターニングしたフォトレジスト514(第3パターン)を形成する第3パターン形成工程を行う。このフォトレジスト514は、図7に示したライン状のアモルファスシリコン層502と直行する方向のライン状のパターンで、例えば、ラインの幅(線幅)が60nm、ラインとラインとの間の間隔が60nmのパターンからなる。なお、図8の左側には、後述する図9に示す平面図におけるB断面、図8の右側には、C断面を示してある。
Next, as shown in FIGS. 8B1 and 8C1, the antireflection film (BARC) 513 is formed from the state shown in FIG. A third pattern forming process is performed to form the photoresist 514 (third pattern). This
図8(B2),(C2)は、上記のフォトレジスト514をトリミングして線幅を細くする(例えば、30nmとする)とともに、反射防止膜(BARC)513をエッチングした状態を示している。このフォトレジスト514のトリミング及び反射防止膜(BARC)513のエッチングを行う工程は、例えば、酸素プラズマ等を用いたプラズマエッチングにより行うことができる。
FIGS. 8B2 and 8C2 show a state in which the
次に、図8(B3),(C3)に示すように、SiO2膜515を成膜する第2成膜工程を行う。この成膜工程は、前述した実施形態と同様に、例えば、加熱触媒体で成膜ガスを活性化させた化学気相成長等によって行う。 Next, as shown in FIGS. 8B3 and 8C3, a second film forming process for forming the SiO 2 film 515 is performed. This film forming step is performed, for example, by chemical vapor deposition in which a film forming gas is activated by a heating catalyst body, as in the above-described embodiment.
次に、図8(B4),(C4)に示すように、SiO2膜515をエッチングし、SiO2膜515が、フォトレジスト514のパターンの側壁部にのみ残った状態とする第3エッチング工程を行う。このエッチングは、例えば、CF4、C4F8、CHF3、CH3F、CH2F2等のCF系ガスと、Arガス等の混合ガス、またはこの混合ガスに必要に応じて酸素を添加したガス等を用いて行うことができる。
Next, as shown in FIGS. 8B4 and 8C4, the SiO 2 film 515 is etched so that the SiO 2 film 515 remains only on the sidewalls of the
次に、図8(B5),(C5)に示すように、酸素プラズマを用いたアッシング等により、フォトレジスト514のパターンを除去して、側壁部に残ったSiO2膜515によるパターン(第4パターン)を形成する第4パターン形成工程を行う。
Next, as shown in FIGS. 8B5 and 8C5, the pattern of the
次に、図8(B6),(C6)に示すように、SiO2膜515によるパターン及びアモルファスシリコン層502をマスクとして、窒化シリコン層501をエッチングする第4エッチング工程を行う。窒化シリコン層501のエッチングは、例えば、例えば、CF4、C4F8、CHF3、CH3F、CH2F2等のCF系ガスと、Arガス等の混合ガス、またはこの混合ガスに必要に応じて酸素を添加したガス等を用いて行うことができる。この状態では、図9の平面図に示すように、半導体ウエハを上から見たときに、ライン状のSiO2膜515と、このライン状のSiO2膜515の間の矩形状のアモルファスシリコン層502に囲まれて矩形状に酸化シリコン層500が露出した領域が形成された状態となっている。
Next, as shown in FIGS. 8B6 and 8C6, a fourth etching process for etching the
次に、図10に示すように、SiO2膜515を除去するとともに、アモルファスシリコン層502及び窒化シリコン層501をマスクとして、酸化シリコン層500をエッチングする第5エッチング工程を行う。以上の工程によって、図10に示すように、酸化シリコン層500にシリコンウエハWの表面が露出するホール形状を形成する。なお、図10(a)は平面図、図10(b)は、図10(a)に示す一点鎖線Bに沿った断面図、図10(c)は、図10(a)に示す一点鎖線Cに沿った断面図である。
Next, as shown in FIG. 10, the SiO 2 film 515 is removed, and a fifth etching process is performed to etch the
上記の第5実施形態によれば、例えば、1辺が30nm等の微細なホール形状のパターンを形成することができる。 According to the fifth embodiment, for example, a fine hole-shaped pattern with one side of 30 nm or the like can be formed.
図5は、上記の半導体装置の製造方法を実施するための半導体装置の製造装置の構成の一例を模式的に示す上面図である。半導体装置の製造装置1の中央部分には、真空搬送チャンバ10が設けられており、この真空搬送チャンバ10に沿って、その周囲には、複数(本実施形態では6個)の処理チャンバ11〜16が配設されている。これらの処理チャンバーは、内部でプラズマエッチング及び加熱触媒体で成膜ガスを活性化させた化学気相成長を行うものである。
FIG. 5 is a top view schematically showing an example of the configuration of a semiconductor device manufacturing apparatus for carrying out the semiconductor device manufacturing method described above. A
真空搬送チャンバ10の手前側(図中下側)には、2つのロードロックチャンバ17が設けられ、これらのロードロックチャンバ17のさらに手前側(図中下側)には、大気中で基板(本実施形態では半導体ウエハW)を搬送するための搬送チャンバ18が設けられている。また、搬送チャンバ18のさらに手前側(図中下側)には、複数枚の半導体ウエハWを収容可能とされた基板収容ケース(カセット又はフープ)が配置される載置部19が複数(図5では3つ)設けられており、搬送チャンバ18の側方(図中左側)には、オリエンテーションフラット或いはノッチにより半導体ウエハWの位置を検出するオリエンタ20が設けられている。
Two
ロードロックチャンバ17と搬送チャンバ18との間、ロードロックチャンバ17と真空搬送チャンバ10との間、真空搬送チャンバ10と処理チャンバ11〜16との間には、夫々ゲートバルブ22が設けられ、これらの間を気密に閉塞及び開放できるようになっている。また、真空搬送チャンバ10内には真空搬送機構30が設けられている。この真空搬送機構30は、第1のピック31と第2のピック32を具備し、これらによって2枚の半導体ウエハWを支持可能に構成されており、各処理チャンバ11〜16、ロードロック室17に、半導体ウエハWを搬入、搬出できるよう構成されている。
また、搬送チャンバ18内には、大気搬送機構40が設けられている。この大気搬送機構40は、第1のピック41と第2のピック42とを具備しており、これらによって2枚の半導体ウエハWを支持可能に構成されている。大気搬送機構40は、載置部19に載置された各カセット又はフープ、ロードロック室17、オリエンタ20に半導体ウエハWを搬入、搬出できるよう構成されている。
An
上記構成の半導体装置の製造装置1は、制御部60によって、その動作が統括的に制御される。この制御部60には、CPUを備え半導体装置の製造装置1の各部を制御するプロセスコントローラ61と、ユーザインターフェース部62と、記憶部63とが設けられている。
The operation of the semiconductor
ユーザインターフェース部62は、工程管理者が半導体装置の製造装置1を管理するためにコマンドの入力操作を行うキーボードや、半導体装置の製造装置1の稼働状況を可視化して表示するディスプレイ等から構成されている。
The
記憶部63には、半導体装置の製造装置1で実行される各種処理をプロセスコントローラ61の制御にて実現するための制御プログラム(ソフトウエア)や処理条件データ等が記憶されたレシピが格納されている。そして、必要に応じて、ユーザインターフェース部62からの指示等にて任意のレシピを記憶部63から呼び出してプロセスコントローラ61に実行させることで、プロセスコントローラ61の制御下で、半導体装置の製造装置1での所望の処理が行われる。また、制御プログラムや処理条件データ等のレシピは、コンピュータで読取り可能なプログラム記憶媒体(例えば、ハードディスク、CD、フレキシブルディスク、半導体メモリ等)などに格納された状態のものを利用したり、或いは、他の装置から、例えば専用回線を介して随時伝送させてオンラインで利用したりすることも可能である。
The
上記構成の半導体装置の製造装置1を用いて、第1〜5実施形態に示した一連の工程を実施することができる。なお、成膜工程については、一旦半導体ウエハWを上記の半導体装置の製造装置1から搬出して他の装置によって行ってもよい。また、フォトレジストの塗布、露光、現像工程については、他の塗布装置、露光装置、現像装置によって行う。
A series of steps shown in the first to fifth embodiments can be performed using the semiconductor
100……下地層、101……ポリシリコン層、102……反射防止膜(BARC)、103……フォトレジスト、104……SiO2膜。 100 ...... underlayer 101 ...... polysilicon layer, 102 ...... antireflection film (BARC), 103 ...... photoresist, 104 ...... SiO 2 film.
Claims (13)
前記フォトレジストの第1パターンの上にSiO2膜を成膜する成膜工程と、
前記SiO2膜を前記フォトレジストの第1パターンの側壁部にのみ残るようにエッチングするエッチング工程と、
前記フォトレジストの第1パターンを除去して前記SiO2膜の第2パターンを形成する第2パターン形成工程と、
を具備したことを特徴とする半導体装置の製造方法。 A semiconductor device manufacturing method for manufacturing a semiconductor device by etching a layer to be etched on a substrate into a predetermined pattern based on a first pattern of a photoresist obtained by exposing and developing a photoresist film. ,
A film forming step of forming a SiO 2 film on the first pattern of the photoresist;
An etching step of etching the SiO 2 film so as to remain only on the sidewall of the first pattern of the photoresist;
Removing a first pattern of the photoresist to form a second pattern of the SiO 2 film;
A method for manufacturing a semiconductor device, comprising:
前記成膜工程を、加熱触媒体で成膜ガスを活性化させた化学気相成長によって行うことを特徴とする半導体装置の製造方法。 A method of manufacturing a semiconductor device according to claim 1,
A method of manufacturing a semiconductor device, wherein the film forming step is performed by chemical vapor deposition in which a film forming gas is activated by a heating catalyst body.
前記成膜工程の前に、前記フォトレジストの第1パターンをトリミングするとともに、下層の有機材料からなる反射防止膜をエッチングする工程を具備したことを特徴とする半導体装置の製造方法。 A method of manufacturing a semiconductor device according to claim 1 or 2,
A method of manufacturing a semiconductor device comprising: trimming the first pattern of the photoresist and etching an antireflection film made of an underlying organic material before the film forming step.
前記第2パターン形成工程の後、当該第2パターンをマスクとして下層のシリコン層又は窒化シリコン層又は酸窒化シリコン層をエッチングすることを特徴とする半導体装置の製造方法。 A method of manufacturing a semiconductor device according to claim 1,
After the second pattern forming step, the lower silicon layer, silicon nitride layer, or silicon oxynitride layer is etched using the second pattern as a mask.
前記第2パターン形成工程の後に、当該第2パターンをマスクとして下層の無機材料からなる反射防止膜をエッチングし、この後、前記無機材料からなる反射防止膜の下層の有機膜をエッチングする工程を具備したことを特徴とする半導体装置の製造方法。 A method of manufacturing a semiconductor device according to claim 1 or 2,
After the second pattern forming step, etching the antireflection film made of the lower inorganic material using the second pattern as a mask, and then etching the organic film under the antireflection film made of the inorganic material. A method for manufacturing a semiconductor device, comprising:
前記無機材料からなる反射防止膜が、SOG膜、LTO膜、SiON膜のいずれかであることを特徴とする半導体装置の製造方法。 A method of manufacturing a semiconductor device according to claim 5,
A method of manufacturing a semiconductor device, wherein the antireflection film made of an inorganic material is one of an SOG film, an LTO film, and an SiON film.
フォトレジストからなる複数のライン状の第1パターンを形成する第1パターン形成工程と、
前記第1パターンの上にSiO2膜を成膜する第1成膜工程と、
前記SiO2膜を前記フォトレジストの第1パターンの側壁部にのみ残るようにエッチングする第1エッチング工程と、
前記第1パターンを除去して前記SiO2膜の第2パターンを形成する第2パターン形成工程と、
前記第2パターンをマスクとして下層の第1マスク構成層をエッチングする第2エッチング工程と、
前記第1パターンと直交する方向に、フォトレジストの複数のライン状のパターンからなる第3パターンを形成する工程と、
前記第3パターンの上にSiO2膜を成膜する第2成膜工程と、
前記SiO2膜を前記第3パターンの側壁部にのみ残るようにエッチングする第3エッチング工程と、
前記第3パターンを除去して前記SiO2膜の第4パターンを形成する第4パターン形成工程と、
前記第4パターン及び前記第1マスク構成層をマスクとして、下層の第2マスク構成層をエッチングする第4エッチング工程と、
前記第1マスク構成層と前記第2マスク構成層をマスクとして、前記被エッチング層にホール形状を形成する第5エッチング工程と
を具備したことを特徴とする半導体装置の製造方法。 A method for manufacturing a semiconductor device for manufacturing a semiconductor device by etching a layer to be etched on a substrate into a predetermined pattern,
A first pattern forming step of forming a plurality of line-shaped first patterns made of photoresist;
A first film forming step of forming a SiO 2 film on the first pattern;
A first etching step of etching the SiO 2 film so as to remain only on a sidewall portion of the first pattern of the photoresist;
A second pattern forming step of removing the first pattern to form a second pattern of the SiO 2 film;
A second etching step of etching the underlying first mask constituent layer using the second pattern as a mask;
Forming a third pattern comprising a plurality of line-like patterns of photoresist in a direction orthogonal to the first pattern;
A second film forming step of forming a SiO 2 film on the third pattern;
A third etching step of etching the SiO 2 film so as to remain only on the side walls of the third pattern;
A fourth pattern forming step of removing the third pattern to form a fourth pattern of the SiO 2 film;
A fourth etching step of etching a lower second mask constituent layer using the fourth pattern and the first mask constituent layer as a mask;
A method of manufacturing a semiconductor device, comprising: a fifth etching step of forming a hole shape in the layer to be etched using the first mask constituent layer and the second mask constituent layer as a mask.
前記第1及び第2成膜工程を、加熱触媒体で成膜ガスを活性化させた化学気相成長によって行うことを特徴とする半導体装置の製造方法。 A method for manufacturing a semiconductor device according to claim 7, comprising:
A method of manufacturing a semiconductor device, wherein the first and second film forming steps are performed by chemical vapor deposition in which a film forming gas is activated by a heating catalyst body.
前記第1成膜工程の前に、前記第1パターンをトリミングするとともに、下層の有機材料からなる反射防止膜をエッチングする工程と、
前記第2成膜工程の前に、前記第3パターンをトリミングするとともに、下層の有機材料からなる反射防止膜をエッチングする工程と
を具備したことを特徴とする半導体装置の製造方法。 A method of manufacturing a semiconductor device according to claim 7 or 8,
Trimming the first pattern and etching an antireflection film made of an underlying organic material before the first film forming step;
And a step of trimming the third pattern and etching an antireflection film made of an underlying organic material before the second film forming step.
前記第1マスク構成層がシリコンからなり、前記第2マスク構成層が窒化シリコンからなることを特徴とする半導体装置の製造方法。 A method for manufacturing a semiconductor device according to claim 7, wherein:
The method of manufacturing a semiconductor device, wherein the first mask constituent layer is made of silicon and the second mask constituent layer is made of silicon nitride.
前記基板を収容する処理チャンバーと、
前記処理チャンバー内に処理ガスを供給する処理ガス供給手段と、
前記処理チャンバー内で請求項1から請求項10いずれか1項記載の半導体装置の製造方法が行われるように制御する制御部と
を備えたことを特徴とする半導体装置の製造装置。 A semiconductor device manufacturing apparatus for manufacturing a semiconductor device by etching a layer to be etched on a substrate into a predetermined pattern,
A processing chamber containing the substrate;
A processing gas supply means for supplying a processing gas into the processing chamber;
11. A semiconductor device manufacturing apparatus, comprising: a control unit that controls the semiconductor device manufacturing method according to claim 1 to be performed in the processing chamber.
前記制御プログラムは、実行時に請求項1から請求項10いずれか1項記載の半導体装置の製造方法が行われるように半導体装置の製造装置を制御することを特徴とするプログラム記憶媒体。 A program storage medium storing a control program that operates on a computer,
11. A program storage medium for controlling a semiconductor device manufacturing apparatus so that the method for manufacturing a semiconductor device according to claim 1 is performed when the control program is executed.
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JP5236983B2 (en) | 2013-07-17 |
KR100967924B1 (en) | 2010-07-06 |
TW200929358A (en) | 2009-07-01 |
KR20090032938A (en) | 2009-04-01 |
CN101399189A (en) | 2009-04-01 |
TWI389202B (en) | 2013-03-11 |
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