KR20090039936A - Substrate etching apparatus using remote plasma, and substrate etching method using the same - Google Patents

Substrate etching apparatus using remote plasma, and substrate etching method using the same Download PDF

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KR20090039936A
KR20090039936A KR1020070105444A KR20070105444A KR20090039936A KR 20090039936 A KR20090039936 A KR 20090039936A KR 1020070105444 A KR1020070105444 A KR 1020070105444A KR 20070105444 A KR20070105444 A KR 20070105444A KR 20090039936 A KR20090039936 A KR 20090039936A
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etching
gas
substrate
chamber
substrate etching
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KR1020070105444A
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KR101399117B1 (en
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최종용
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주성엔지니어링(주)
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
    • H01L21/306Chemical or electrical treatment, e.g. electrolytic etching
    • H01L21/3065Plasma etching; Reactive-ion etching

Abstract

A substrate etching device using remote plasma and a method for etching the substrate are provided to improve the uniformity of the etching gas inside the substrate etching device by distributing the etching gas activated outside a chamber to an inner part of the chamber through a gas distributing plate. A substrate platform(130) is installed inside a chamber(110) forming a reaction space. A gas distributing plate(140) is installed in a substrate holding stand. The gas distribution plate is separately combined in the lower part of a chamber lid(120). A remote plasma generator(160) is installed outside the chamber. A first gas supply pipe(150) is connected between the remote plasma generator and the chamber lid. An RF power source(170) to supply the RF power is connected to the remote plasma generator. A second gas supply pipe(152) is connected to the first gas supply pipe.

Description

원격 플라즈마를 이용한 기판 식각장치 및 이를 이용한 기판 식각방법{Substrate etching apparatus using remote plasma, and substrate etching method using the same}Substrate etching apparatus using remote plasma, and substrate etching method using the same}

본 발명은 기판 식각장치 및 식각방법에 관한 것으로서, 구체적으로는 원격플라즈마 발생장치를 통해 챔버의 내부로 공급되는 식각가스와 직접 챔버의 내부로 공급되는 식각유도가스를 이용하여 대면적 기판의 표면에서 균일한 표면조도를 구현하는 식각장치 및 식각방법에 관한 것이다.The present invention relates to a substrate etching apparatus and an etching method, in particular, in the surface of a large-area substrate by using an etching gas supplied into the chamber through the remote plasma generator and an etching induction gas directly supplied into the chamber. An etching apparatus and an etching method for implementing a uniform surface roughness.

일반적으로 반도체소자를 제조하기 위해서는 기판에 특정 물질의 박막을 증착하는 박막증착공정, 감광성 물질을 사용하여 이들 박막 중 선택된 영역을 노출 또는 은폐시키는 포토리소그라피 공정, 선택된 영역의 박막을 제거하여 목적하는 대로 패터닝하는 식각(etching)공정 등을 수행하여야 한다.In general, to manufacture a semiconductor device, a thin film deposition process for depositing a thin film of a specific material on a substrate, a photolithography process for exposing or hiding selected areas of the thin films using a photosensitive material, and removing the thin film of the selected area as desired An etching process such as patterning should be performed.

태양전지를 제조하는 경우에도 이와 같이 기판에 박막을 증착하고 표면을 식각하는 공정이 사용되고 있다.In the case of manufacturing a solar cell, a process of depositing a thin film on a substrate and etching a surface is used.

예를 들어 단결정 또는 다결정 실리콘 기판을 이용한 태양전지를 제조하기 위해서는 광흡수율을 높이기 위하여 표면에 미세한 요철구조를 형성하여야 하는데, 이를 위해 플라즈마 식각이나 습식식각 방법을 이용하고 있다.For example, in order to manufacture a solar cell using a single crystal or polycrystalline silicon substrate, a fine concavo-convex structure should be formed on the surface in order to increase the light absorption rate. For this purpose, a plasma etching method or a wet etching method is used.

플라즈마 식각을 위해서는 RIE(Reactive Ion Etching) 장치의 내부에 기판을 반입한 후에 식각가스를 분사하여 플라즈마를 발생시켜야 한다.For plasma etching, a plasma is generated by injecting an etching gas after loading a substrate into a reactive ion etching (RIE) device.

도 1은 일반적인 RIE장치(10)의 개략적인 구성을 나타낸 것으로서, 반응공간을 형성하는 챔버(11)의 내부에 기판안치대(13)가 설치되고, 기판안치대(13)의 상부에 가스분배판(14)이 설치된다.1 shows a schematic configuration of a general RIE apparatus 10, in which a substrate stabilizer 13 is installed inside a chamber 11 forming a reaction space, and a gas distribution is provided on the substrate stabilizer 13. The plate 14 is installed.

챔버(11)의 상부는 챔버리드(12)에 의해 밀폐되며, 가스분배판(14)은 상기 챔버리드(12)의 하부에 소정 간격 이격되어 결합된다.The upper portion of the chamber 11 is sealed by the chamber lead 12, the gas distribution plate 14 is coupled to the lower portion of the chamber lead 12 spaced apart by a predetermined interval.

챔버리드(12)의 중앙부에는 식각가스를 공급하는 가스공급관(15)이 관통하여 연결되며, 기판안치대(13)에는 RF전력을 제공하는 RF전원(16)이 연결된다. 챔버리드(12)는 도시된 바와 같이 접지될 수도 있으나 제2의 RF전원에 연결될 수도 있다. The gas supply pipe 15 for supplying the etching gas is penetrated to the center portion of the chamber lead 12, and the RF power supply 16 for supplying the RF power is connected to the substrate support 13. The chamber lead 12 may be grounded as shown but may be connected to a second RF power source.

따라서 가스분배판(14)을 통해 식각가스를 분사하면서 기판안치대(13)에 RF전력을 인가하면 기판안치대(13)와 가스분배판(14)의 사이에 RF전기장이 형성되며, RF전기장에 의해 가속된 전자가 중성기체와 충돌함으로써 이온과 활성종의 혼합체인 플라즈마가 형성된다. 이때 RF전기장에 의해 가속된 이온이 기판으로 입사하여 기판의 표면을 식각하게 되는 것이다.Therefore, when RF power is applied to the substrate support 13 while spraying the etching gas through the gas distribution plate 14, an RF electric field is formed between the substrate support 13 and the gas distribution plate 14. The electrons accelerated by the collision with the neutral gas form a plasma which is a mixture of ions and active species. At this time, ions accelerated by the RF electric field are incident on the substrate to etch the surface of the substrate.

그런데 이러한 RIE장치(10)의 내부에 기판을 1매씩 반입하여 처리하여서는 대량 생산에 적용하기 어렵기 때문에 최근의 태양전지 제조시스템에서는 대형의 트레이에 수십 개의 기판을 안치시킨 상태에서 트레이 단위로 기판을 운반 및 처리하는 경우가 보통이다.However, since it is difficult to apply the substrates one by one to the inside of the RIE apparatus 10 and to apply them to mass production, in recent solar cell manufacturing systems, substrates are placed in tray units while dozens of substrates are placed in a large tray. Usually transported and disposed of.

즉, 다수의 기판이 안치된 트레이가 반입되면, 상기 다수의 기판에 대해 한꺼번에 플라즈마 식각공정을 진행하게 되는 것이다.In other words, when a tray in which a plurality of substrates are placed is loaded, the plasma etching process is performed on the plurality of substrates at once.

그런데 대형 트레이를 반입하기 위해 챔버(11)가 커지면 플라즈마 균일도를 확보하는 것이 어려워지며, 이로 인해 장치의 중앙부에 위치하는 기판(s)과 주변부에 위치하는 기판(s)의 표면조도가 균일하지 않게 되는 문제점이 발생한다.However, when the chamber 11 is enlarged to bring in a large tray, it is difficult to secure the plasma uniformity, which causes the surface roughness of the substrate s located in the center of the apparatus and the substrate s located in the periphery to be uneven. Problem occurs.

이를 방지하기 위해서 습식식각을 진행할 수도 있으나, 결정질 실리콘은 결정방향에 따라 식각속도 및 식각방향이 달라지는 특성이 있기 때문에 플라즈마 식각에 비해 균일한 표면조도를 확보하는데 어려움이 있다.In order to prevent this, wet etching may be performed. However, crystalline silicon may have difficulty in securing uniform surface roughness compared to plasma etching because the etch rate and the etching direction may vary depending on the crystal direction.

본 발명은 이러한 문제점을 해결하기 위한 것으로서, 플라즈마를 이용하는 대형의 식각장치에서 기판에 대한 식각균일도를 향상시킬 수 있는 방법을 제공하는데 그 목적이 있다.An object of the present invention is to provide a method for improving the etching uniformity of a substrate in a large etching apparatus using plasma.

본 발명은 상기 목적을 달성하기 위하여, 챔버의 내부에 기판을 안치하는 제1단계; 상기 챔버의 내부로 식각유도가스를 공급하는 제2단계; 상기 챔버의 내부로 식각가스의 활성종을 공급하여 상기 기판을 식각하는 제3단계를 포함하는 기판 식각 방법을 제공한다.The present invention to achieve the above object, the first step of placing the substrate in the chamber; Supplying an etching induction gas into the chamber; It provides a substrate etching method comprising a third step of etching the substrate by supplying the active species of the etching gas into the chamber.

상기 기판 식각 방법에서 상기 식각유도가스는 N 또는 O 중에서 적어도 하나의 원소를 포함하는 것을 특징으로 할 수 있으며, 이러한 식각유도가스로는 NO, N2O, N2 또는 O2 등이 사용될 수 있다.In the substrate etching method, the etch inductance may include at least one element of N or O, and as the etch induction gas, NO, N 2 O, N 2, or O 2 may be used.

또한 상기 식각가스는 NF3, F2, SF6, Cl2 또는 CHF3인 것을 특징으로 할 수 있다.In addition, the etching gas may be characterized in that the NF 3 , F 2 , SF 6 , Cl 2 or CHF 3 .

또한 상기 식각가스와 상기 식각유도가스의 비율은 10:1 ~ 2:1의 범위인 것을 특징으로 할 수 있다.In addition, the ratio of the etching gas and the etching induction gas may be characterized in that the range of 10: 1 ~ 2: 1.

또한 상기 제1단계에서는, 다수의 기판을 트레이에 안치하여 상기 챔버의 내부로 반입하는 것을 특징으로 할 수 있다.In the first step, a plurality of substrates may be placed in a tray and brought into the chamber.

또한 상기 제2단계의 이전에는, 상기 챔버의 내부압력을 100mTorr 내지 5Torr의 범위로 설정하는 과정을 포함하는 것을 특징으로 할 수 있다.In addition, before the second step, it may be characterized in that it comprises the step of setting the internal pressure of the chamber in the range of 100mTorr to 5Torr.

또한 상기 제3단계에서 상기 식각가스는 비반응성 가스와 함께 상기 챔버의 내부로 공급되는 것을 특징으로 할 수 있다.In addition, in the third step, the etching gas may be supplied into the chamber together with the non-reactive gas.

또한 상기 제3단계의 이후에, 상기 제2단계 및 상기 제3단계를 1사이클로 하는 공정을 1회 이상 반복하는 것을 특징으로 할 수 있다.In addition, after the third step, the process of using the second step and the third step as one cycle may be repeated one or more times.

또한 본 발명은, 반응공간을 형성하는 챔버; 상기 챔버의 내부에 설치되는 기판안치대; 상기 기판안치대의 상부에 설치되는 가스분배판; 상기 챔버의 외부에 설치되는 원격플라즈마 발생장치; 상기 원격플라즈마 발생장치에서 활성화된 식각가스를 상기 가스분배판의 상부로 공급하는 가스공급관; 상기 기판안치대의 상부로 식각유도가스를 공급하는 가스분사부를 포함하는 기판 식각 장치를 제공한다.In another aspect, the present invention, the chamber forming a reaction space; A substrate support installed in the chamber; A gas distribution plate installed on an upper portion of the substrate stabilizer; A remote plasma generator installed outside the chamber; A gas supply pipe configured to supply an etching gas activated by the remote plasma generator to an upper portion of the gas distribution plate; It provides a substrate etching apparatus including a gas injection unit for supplying the etching induction gas to the upper portion of the substrate stabilizer.

상기 기판 식각 장치에서 상기 가스공급관에는 상기 식각가스와 함께 공급할 비반응성 가스를 공급하기 위한 제2의 가스공급관이 연결되는 것을 특징으로 할 수 있다.In the substrate etching apparatus, the gas supply pipe may be connected to a second gas supply pipe for supplying a non-reactive gas to be supplied together with the etching gas.

또한 상기 가스분사부는 상기 챔버의 측벽 또는 리드(lid)를 관통하여 설치되는 다수의 인젝터이거나 상기 챔버의 내부에 설치되는 가스링인 것을 특징으로 할 수 있다.In addition, the gas injection unit may be a plurality of injectors installed through the side wall or lid (lid) of the chamber or may be a gas ring installed inside the chamber.

또한 상기 기판 식각 장치는, 상기 챔버의 내부에 플라즈마를 발생시키기 위한 플라즈마발생수단을 더 포함하는 것을 특징으로 할 수 있으며, 이때 상기 플라즈마발생수단은 상기 기판안치대 또는 상기 챔버의 리드에 연결되는 RF전원을 포함할 수 있다.In addition, the substrate etching apparatus may further include a plasma generating means for generating a plasma inside the chamber, wherein the plasma generating means is RF connected to the substrate support or the lead of the chamber It may include a power source.

본 발명에 따르면, 챔버의 외부에서 활성화된 식각가스를 가스분배판을 통해 챔버의 내부로 균일하게 분사하기 때문에 기판식각장치의 내부에서 식각가스의 균일도가 향상된다. 또한 식각유도가스의 영향으로 인해 식각속도가 증가하는 한편 대면적 기판이나 대형의 트레이에 안치된 모든 기판에 걸쳐서 균일한 표면조도를 얻을 수 있게 된다.According to the present invention, since the etching gas activated from the outside of the chamber is uniformly sprayed into the chamber through the gas distribution plate, the uniformity of the etching gas in the substrate etching apparatus is improved. In addition, the etching speed increases due to the influence of the etching induction gas, and uniform surface roughness can be obtained over a large area substrate or all substrates placed in a large tray.

이하 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 2는 본 발명의 실시예에 따른 플라즈마 식각장치(100)의 개략적인 구성을 나타낸 단면도이다.2 is a cross-sectional view showing a schematic configuration of a plasma etching apparatus 100 according to an embodiment of the present invention.

본 발명의 플라즈마 식각장치(100)에서는 반응공간을 형성하는 챔버(110)의 내부에 기판안치대(130)가 설치되고, 기판안치대(130)의 상부에 가스분배판(140)이 설치된다. 또한 챔버(110)의 상부는 챔버리드(120)에 의해 밀폐되며, 가스분배판(140)은 챔버리드(120)의 하부에 소정 간격 이격되어 결합된다.In the plasma etching apparatus 100 of the present invention, the substrate stabilizer 130 is installed inside the chamber 110 forming the reaction space, and the gas distribution plate 140 is installed on the substrate stabilizer 130. . In addition, the upper portion of the chamber 110 is sealed by the chamber lead 120, the gas distribution plate 140 is coupled to the lower portion of the chamber lead 120 spaced apart.

챔버(110)의 외부에는 NF3, F2, SF6, Cl2, CHF3 등의 식각가스를 활성종과 이온의 혼합체인 플라즈마 상태로 활성화시키는 원격플라즈마 발생장치(160)가 설치되고, 원격플라즈마 발생장치(160)와 챔버리드(120)의 사이에는 제1가스공급관(150)이 연결된다. 원격플라즈마 발생장치(160)에는 RF전력을 제공하는 RF전원(170)이 연결된다.Outside the chamber 110 is provided with a remote plasma generator 160 for activating the etching gas, such as NF 3 , F 2 , SF 6 , Cl 2 , CHF 3 in a plasma state of a mixture of active species and ions, The first gas supply pipe 150 is connected between the plasma generating device 160 and the chamber lead 120. The remote plasma generator 160 is connected to an RF power source 170 that provides RF power.

즉, 본 발명의 플라즈마 식각장치(100)는 챔버(110)의 내부에서 플라즈마를 직접 생성하는 것이 아니라 챔버(110) 외부의 원격플라즈마 발생장치(160)에서 식각가스를 활성화시킨 다음 이를 가스분배판(140)을 통해 챔버(110)의 내부로 균일 하게 분사하기 때문에 챔버 내부에서 식각가스의 균일도를 훨씬 높일 수 있다.That is, the plasma etching apparatus 100 of the present invention does not directly generate the plasma inside the chamber 110, but activates the etching gas in the remote plasma generator 160 outside the chamber 110, and then uses the gas distribution plate. Since uniformly sprayed into the chamber 110 through the 140, it is possible to increase the uniformity of the etching gas in the chamber much.

제1가스공급관(150)에는 식각가스와 함께 챔버(110)의 내부로 Ar, He 등의 비반응성 가스를 공급하는 제2가스공급관(152)이 연결될 수 있는데, 실험에 따르면 이러한 비반응성 가스를 함께 공급하면 식각가스의 이온화율이 높아져 식각효과가 증대되는 것으로 나타났기 때문이다.The first gas supply pipe 150 may be connected to the second gas supply pipe 152 for supplying the non-reactive gas such as Ar and He to the inside of the chamber 110 together with the etching gas. This is because when it is supplied together, the ionization rate of the etching gas is increased to increase the etching effect.

또한 본 발명의 실시예에서는 NO, N2O, N2, O2 등의 식각유도가스를 챔버(110)의 내부로 공급하기 위한 가스분사부(180)가 가스분배판(140)과는 별도로 구비되는 점에 특징이 있다.In addition, in the embodiment of the present invention, the gas injection unit 180 for supplying the etch induction gas such as NO, N 2 O, N 2 , O 2 into the chamber 110 is separate from the gas distribution plate 140. There is a feature in that it is provided.

이러한 가스분사부(180)는 챔버(110)의 측벽에 대칭적으로 설치되는 다수의 인젝터일 수도 있고, 다수의 분사구를 가지는 가스링일 수도 있다. 또한 챔버(110)의 측벽이 아닌 챔버리드(120)의 주변부에 설치될 수도 있다.The gas injection unit 180 may be a plurality of injectors symmetrically installed on the sidewall of the chamber 110, or may be a gas ring having a plurality of injection holes. It may also be installed in the periphery of the chamber lead 120, not the side wall of the chamber 110.

가스분사부(180)에는 식각유도가스를 공급하는 제3가스공급관(182)이 연결된다.The gas injection unit 180 is connected to the third gas supply pipe 182 for supplying the etching induction gas.

이하에서는 도 3의 순서도 및 도 2를 참조하여 본 발명의 실시예에 따라 기판을 식각하는 과정을 설명한다.Hereinafter, a process of etching a substrate according to an exemplary embodiment of the present invention will be described with reference to the flowchart of FIG. 3 and FIG. 2.

먼저 챔버(110)의 내부로 기판(s)을 반입하여 기판안치대(130)의 상부에 올려놓은 다음 공정분위기를 조성한다. 이때 챔버(110)의 내부압력은 100mTorr 내지 5 Torr의 범위로 하고, 챔버(110)의 내부온도는 상온에서 500℃이하로 유지시키는 것이 바람직하다.First, the substrate s is introduced into the chamber 110 and placed on top of the substrate stabilizer 130 to form a process atmosphere. In this case, the internal pressure of the chamber 110 is in a range of 100 mTorr to 5 Torr, and the internal temperature of the chamber 110 is preferably maintained at 500 ° C. or less at room temperature.

이때 기판(s)을 1매씩 반입하여 처리할 수도 있고, 다수의 기판이 안치된 대형 트레이를 챔버(110)의 내부로 반입하여 상기 다수의 기판을 한꺼번에 처리할 수도 있다. (ST11)In this case, the substrate s may be carried in one by one, and may be processed, or a large tray in which a plurality of substrates are placed may be loaded into the chamber 110 to process the plurality of substrates at once. (ST11)

이어서 가스분사부(180)를 통해 NO, N2O, N2, O2 등의 식각유도가스를 기판(s)의 상부에 균일하게 분사한다. (ST12)Subsequently, the etch induction gases such as NO, N 2 O, N 2 , and O 2 are uniformly sprayed on the substrate s through the gas injection unit 180. (ST12)

이어서 원격플라즈마 발생장치(160)에서 NF3, F2, SF6, Cl2, CHF3 등의 식각가스를 활성화시켜 챔버(110)의 내부로 공급한다. 이때 챔버(110)의 내부로 식각가스만을 공급할 수도 있고 Ar이나 He 등의 비반응성 가스를 함께 공급할 수도 있다.Subsequently, the remote plasma generator 160 activates an etching gas such as NF 3 , F 2 , SF 6 , Cl 2 , or CHF 3 to supply the inside of the chamber 110. In this case, only the etching gas may be supplied into the chamber 110 or a non-reactive gas such as Ar or He may be supplied together.

식각가스는 기판(s)을 식각하여 표면에 미세한 요철을 형성하며, 먼저 분사된 식각유도가스는 식각속도를 향상시키고 플라즈마의 균일도를 높이는 역할을 한다. 즉, 대면적 기판(s)의 전면이나 대면적 트레이에 안치된 모든 기판에 걸쳐 균일한 표면조도를 얻을 수 있도록 한다.The etching gas etches the substrate s to form fine irregularities on the surface, and the etching induction sprayed first serves to improve the etching rate and increase the uniformity of the plasma. That is, it is possible to obtain a uniform surface roughness over the entire surface of the large area substrate (s) or all the substrates placed in the large area tray.

이때 식각가스와 식각유도가스의 비율은 10:1 ~ 2:1의 범위인 것이 바람직하다. (ST13, ST14)At this time, the ratio of the etching gas and the etching induction gas is preferably in the range of 10: 1 ~ 2: 1. (ST13, ST14)

도 4 및 도 5는 식각 전후의 기판표면의 요철구조를 나타낸 모식도로서, 공정 전에는 도 4에 도시된 바와 같이 기판표면의 요철이 매우 불규칙한 패턴을 가지지만 본 발명의 실시예를 적용하면 도 5에 도시된 바와 같이 피라미드 형상의 균일한 패턴을 얻을 수 있다.4 and 5 are schematic diagrams showing the uneven structure of the substrate surface before and after etching. Before the process, as shown in FIG. 4, the unevenness of the substrate surface has a very irregular pattern, but the embodiment of the present invention is applied to FIG. 5. As shown in the figure, a uniform pattern of pyramidal shapes can be obtained.

이와 같이 식각유도가스를 분사하는 공정(ST12)과 식각가스를 공급하는 공정(ST13)은 각각 1회에 그칠 수도 있지만, 식각유도가스를 분사하는 공정(ST12)과 식각가스를 공급하는 공정(ST13)을 1사이클로 하여 이를 다수 회 반복할 수도 있다.As such, the step of injecting the etching induction gas (ST12) and the step of supplying the etching gas (ST13) may be performed only once, respectively, but the step of injecting the etching induction gas (ST12) and the step of supplying the etching gas (ST13). ) Can be repeated one or more times with one cycle.

한편 이상에서는 외부의 원격플라즈마 발생장치(160)에서 식각가스를 활성화시켜 챔버(110)의 내부로 공급하는 방법을 설명하였으나, 도 6에 도시된 바와 같이 기판안치대(130)에 제2의 RF전원(190)을 연결하여 챔버(110)의 내부에서 플라즈마를 발생시키는 것도 가능하다.Meanwhile, the method of activating the etching gas in the external remote plasma generator 160 to supply the inside of the chamber 110 has been described. However, as shown in FIG. 6, the second RF is provided to the substrate stabilizer 130. It is also possible to generate a plasma inside the chamber 110 by connecting the power source 190.

이를 통해 원격플라즈마 발생장치(160)에서 미활성화된 식각가스를 챔버(110)의 내부에서 활성화시킬 수도 있기 때문에 식각가스의 활성화율을 높여 식각 효율을 향상시킬 수 있다.As a result, since the unactivated etching gas in the remote plasma generating device 160 may be activated in the chamber 110, the etching efficiency may be improved by increasing the activation rate of the etching gas.

이때 제2의 RF전원(190)은 도시된 바와 같이 기판안치대(130)에 연결될 수도 있으나, 챔버리드(120)에 연결될 수도 있다. 또한 기판안치대(130) 및 챔버리드(120)에 각각 다른 RF전원을 연결할 수도 있다.In this case, the second RF power source 190 may be connected to the substrate support 130 as shown, but may also be connected to the chamber lead 120. In addition, different RF power sources may be connected to the substrate support 130 and the chamber lead 120, respectively.

도 1은 일반적인 RIE장치의 개략 단면도1 is a schematic cross-sectional view of a general RIE apparatus

도 2는 본 발명의 실시예에 따른 기판식각장치의 개략 단면도2 is a schematic cross-sectional view of a substrate etching apparatus according to an embodiment of the present invention.

도 3은 본 발명의 실시예에 따른 기판식각방법을 나타낸 순서도3 is a flow chart showing a substrate etching method according to an embodiment of the present invention.

도 4 및 도 5는 각각 식각 이전과 식각 이후의 기판의 표면형상을 나타낸 모식도4 and 5 are schematic views showing the surface shape of the substrate before and after etching, respectively

도 6은 본 발명의 다른 실시예에 따른 기판식각장치의 개략 단면도6 is a schematic cross-sectional view of a substrate etching apparatus according to another embodiment of the present invention.

*도면의 주요부분에 대한 부호의 설명* * Description of the symbols for the main parts of the drawings *

100: 기판식각장치 110: 챔버100: substrate etching apparatus 110: chamber

120: 챔버리드 130: 기판안치대120: chamber lead 130: substrate support

140: 가스분배판 150: 제1가스공급관140: gas distribution plate 150: first gas supply pipe

152: 제2가스공급관 160: 원격플라즈마발생장치152: second gas supply pipe 160: remote plasma generating device

170: RF전원 180: 가스분사부170: RF power supply 180: gas injection unit

182: 제3가스공급관 190: 제2 RF전원182: third gas supply pipe 190: second RF power source

Claims (14)

챔버의 내부에 기판을 안치하는 제1단계;A first step of placing the substrate in the chamber; 상기 챔버의 내부로 식각유도가스를 공급하는 제2단계;Supplying an etching induction gas into the chamber; 상기 챔버의 내부로 식각가스의 활성종을 공급하여 상기 기판을 식각하는 제3단계;A third step of etching the substrate by supplying active species of an etching gas into the chamber; 를 포함하는 기판 식각 방법Substrate etching method comprising 제1항에 있어서,The method of claim 1, 상기 식각유도가스는 N 또는 O 중에서 적어도 하나의 원소를 포함하는 것을 특징으로 하는 기판 식각 방법The etching induction is a substrate etching method comprising at least one element of N or O 제2항에 있어서,The method of claim 2, 상기 식각유도가스는 NO, N2O, N2 또는 O2인 것을 특징으로 하는 기판 식각 방법The etching induction is a substrate etching method, characterized in that NO, N 2 O, N 2 or O 2 제1항에 있어서,The method of claim 1, 상기 식각가스는 NF3, F2, SF6, Cl2 또는 CHF3인 것을 특징으로 하는 기판 식각 방법The etching gas is a substrate etching method, characterized in that NF 3 , F 2 , SF 6 , Cl 2 or CHF 3 제1항에 있어서,The method of claim 1, 상기 식각가스와 상기 식각유도가스의 비율은 10:1 ~ 2:1의 범위인 것을 특징으로 하는 기판 식각 방법The ratio of the etching gas and the etching induction gas substrate etching method, characterized in that the range of 10: 1 ~ 2: 1 제1항에 있어서,The method of claim 1, 상기 제1단계에서는, 다수의 기판을 트레이에 안치하여 상기 챔버의 내부로 반입하는 것을 특징으로 하는 기판 식각 방법In the first step, the substrate etching method characterized in that the plurality of substrates are placed in a tray and brought into the chamber. 제1항에 있어서,The method of claim 1, 상기 제2단계의 이전에는, 상기 챔버의 내부압력을 100mTorr 내지 5Torr의 범위로 설정하는 과정을 포함하는 것을 특징으로 하는 기판 식각 방법Prior to the second step, the substrate etching method comprising the step of setting the internal pressure of the chamber in the range of 100mTorr to 5Torr. 제1항에 있어서,The method of claim 1, 상기 제3단계에서 상기 식각가스는 비반응성 가스와 함께 상기 챔버의 내부로 공급되는 것을 특징으로 하는 기판 식각 방법In the third step, the etching gas is supplied to the inside of the chamber with a non-reactive gas substrate etching method 제1항에 있어서,The method of claim 1, 상기 제3단계의 이후에, 상기 제2단계 및 상기 제3단계를 1사이클로 하는 공정을 1회 이상 반복하는 것을 특징으로 하는 기판 식각 방법After the third step, the substrate etching method, characterized in that for repeating the second step and the third step as a cycle one or more times. 반응공간을 형성하는 챔버;A chamber forming a reaction space; 상기 챔버의 내부에 설치되는 기판안치대;A substrate support installed in the chamber; 상기 기판안치대의 상부에 설치되는 가스분배판;A gas distribution plate installed on an upper portion of the substrate stabilizer; 상기 챔버의 외부에 설치되는 원격플라즈마 발생장치;A remote plasma generator installed outside the chamber; 상기 원격플라즈마 발생장치에서 활성화된 식각가스를 상기 가스분배판의 상부로 공급하는 가스공급관;A gas supply pipe configured to supply an etching gas activated by the remote plasma generator to an upper portion of the gas distribution plate; 상기 기판안치대의 상부로 식각유도가스를 공급하는 가스분사부;A gas injection unit supplying an etching induction gas to an upper portion of the substrate stabilizer; 를 포함하는 기판 식각 장치Substrate etching apparatus comprising a 제10항에 있어서,The method of claim 10, 상기 가스공급관에는 상기 식각가스와 함께 공급할 비반응성 가스를 공급하기 위한 제2의 가스공급관이 연결되는 것을 특징으로 하는 기판 식각 장치A substrate etching apparatus, characterized in that the second gas supply pipe for supplying a non-reactive gas to be supplied with the etching gas is connected to the gas supply pipe. 제10항에 있어서,The method of claim 10, 상기 가스분사부는 상기 챔버의 측벽 또는 리드(lid)를 관통하여 설치되는 다수의 인젝터이거나 상기 챔버의 내부에 설치되는 가스링인 것을 특징으로 하는 기판 식각 장치The gas injector is a substrate etching apparatus, characterized in that a plurality of injectors installed through the side wall or lid of the chamber or a gas ring installed inside the chamber. 제10항에 있어서,The method of claim 10, 상기 챔버의 내부에 플라즈마를 발생시키기 위한 플라즈마발생수단을 더 포함하는 것을 특징으로 하는 기판 식각 장치Substrate etching apparatus further comprises a plasma generating means for generating a plasma in the chamber; 제13항에 있어서,The method of claim 13, 상기 플라즈마발생수단은 상기 기판안치대 또는 상기 챔버의 리드에 연결되는 RF전원을 포함하는 것을 특징으로 하는 기판 식각 장치The plasma generating means includes a substrate etching apparatus comprising an RF power source connected to the substrate stabilizer or the lead of the chamber.
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