KR20060016630A - Method for analyzing defects in semiconductor device - Google Patents
Method for analyzing defects in semiconductor device Download PDFInfo
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- KR20060016630A KR20060016630A KR1020040065142A KR20040065142A KR20060016630A KR 20060016630 A KR20060016630 A KR 20060016630A KR 1020040065142 A KR1020040065142 A KR 1020040065142A KR 20040065142 A KR20040065142 A KR 20040065142A KR 20060016630 A KR20060016630 A KR 20060016630A
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Abstract
본 발명은 그라인더(Grinder)를 이용하여 폴리이미드 계층 및 페시베이션 계층 일부분을 제거하고, 제거하고 남은 페시베이션 계층의 일부분을 SEM의 구동 전압을 조절하여 불량 원인을 보다 정확하게 분석하기 위한 것으로, 이를 위한 작용은 폴리이미드 계층을 그라이딩하는 제1과정과, 폴리이미드 계층이 전면 그라이딩된 후, 페시베이션 계층 일부를 그라이딩하는 제2과정과, 제2과정에서 그라이딩하고 남은 페시베이션 계층을 SEM을 이용하여 불량 포인트를 분석하는 제3과정을 포함한다. 따라서, 불량의 원인을 보다 명확하게 규명하여 공정 파트에 피드백하여 공정의 이상 유무 및 장비의 이상 유무 확인으로 반도체 수율을 향상시킬 수 있는 효과가 있다. The present invention is to remove a portion of the polyimide layer and passivation layer by using a grinder, and to analyze the cause of the defect more accurately by adjusting the driving voltage of the SEM to remove a portion of the remaining passivation layer. The operation is performed by the first process of gliding the polyimide layer, the second process of gliding a portion of the passivation layer after the polyimide layer is totally glided, and the passivation layer remaining after gliding in the second process. Using a third process of analyzing the bad point using. Therefore, it is possible to more clearly identify the cause of the defect to feed back to the process parts to improve the semiconductor yield by confirming the abnormality of the process and the abnormality of the equipment.
그라인더(Grinder), SEM, 폴리이미드 계층, 페시베이션 계층Grinder, SEM, Polyimide Layer, Passivation Layer
Description
도 1은 반도체 소자의 불량이 발생된 탑 메탈(Top Metal) 계층에 대하여 Grinding 하기 전의 단면도이고, 1 is a cross-sectional view before grinding on a top metal layer in which a defect of a semiconductor device is generated.
도 2는 본 발명에 따른 반도체 소자의 불량이 발생된 탑 메탈 라인에 대하여 Grinding 후의 단면도이며, 2 is a cross-sectional view after grinding for the top metal line in which the defect of the semiconductor device according to the present invention occurs.
도 3은 본 발명에 따른 반도체 소자의 불량 분석 SEM 사진을 도시한 도면이다. 3 is a view showing a SEM analysis of the failure of the semiconductor device according to the present invention.
본 발명은 반도체 소자의 불량 분석방법에 관한 것으로, 특히 탑 메탈(Top Metal) 계층에서 발생된 불량의 원인을 분석할 수 있는 방법에 관한 것이다. BACKGROUND OF THE
통상적으로, 반도체 소자를 제조하는 경우, 점차적으로 그 소자의 초 고집적화에 따라 회로 선폭이 감소하고, 메탈 계층(Metal Layer)도 다층 구조로 형성되어 있다. In general, in the case of manufacturing a semiconductor device, the circuit line width is gradually reduced with the ultra-high integration of the device, and the metal layer is also formed in a multilayer structure.
도 1은 반도체 소자의 불량이 발생된 탑 메탈 계층에 대하여 Grinding 하기 전의 단면도로서, 다층의 메탈 계층(S1)과, 메탈 계층 상부에 스크래치 및 모이스춰(Moisture)를 방지하기 위해 PE-산화막(S2)/PE-질화막(S3)으로 이루어진 페시베이션 계층(Passivation Layer)과, 페시베이션 상부에 폴리이미드 계층(Polyemide Layer)(S4)을 순차적으로 증착함으로써, 이 두 계층의 강한 밀도를 이용하여 메탈 계층 상부의 스크래치 및 모이스춰(Moisture)를 방지할 수 있다. FIG. 1 is a cross-sectional view before grinding of a top metal layer in which a defect of a semiconductor device is generated, and includes a multilayer metal layer S1 and a PE oxide layer S2 to prevent scratches and moisture on the metal layer. By sequentially depositing a passivation layer consisting of a / PE-nitride film (S3) and a polyimide layer (S4) on top of the passivation, the strong density of these two layers is used to Prevents scratches and moisture
그러나, 다층 구조의 메탈 계층 중 탑 메탈 계층에 불량 포인트, 즉 쇼트 현상이 발생될 경우, 그 발생 현상을 정확하게 분석할 수 없다. 즉, 메탈 계층 중에서 탑 메탈의 경우, 건식 식각 및 습식 식각에 의해 나타나는 부분적인 오버 에칭, 혹은 언더 에칭 현상이 발생하며, 또한 상술한 바와 같이, 스크래치 및 Moisture를 방지하기 위해 PE-산화막/PE-질화막으로 이루어진 페시베이션 계층과, 페시베이션 상부에 폴리이미드 계층을 순차적으로 증착하므로, 탑 메탈 불량 부위를 정밀 검사 시 정확한 분석을 행할 수 없게 되는 문제점을 갖는다. However, when a defect point, that is, a short phenomenon occurs in the top metal layer among the metal layers of the multilayer structure, the occurrence phenomenon cannot be accurately analyzed. That is, in the case of the top metal in the metal layer, a partial over etching or under etching phenomenon caused by dry etching and wet etching occurs, and as described above, in order to prevent scratches and moisture, PE-oxide film / PE- Since the passivation layer made of a nitride film and the polyimide layer are sequentially deposited on the passivation layer, there is a problem in that an accurate analysis cannot be performed when inspecting the top metal defect site.
이에, 본 발명은 상술한 문제점을 해결하기 위해 안출한 것으로, 그 목적은 그라인더(Grinder)를 이용하여 폴리이미드 계층 및 페시베이션 계층 일부분을 제거하고, 제거하고 남은 페시베이션 계층의 일부분을 SEM의 구동 전압을 조절하여 불량 원인을 보다 정확하게 분석할 수 있는 반도체 소자의 불량 분석방법을 제공함에 있다.Accordingly, the present invention has been made to solve the above-described problems, the object of the present invention is to remove a portion of the polyimide layer and passivation layer using a grinder, and to remove a portion of the remaining passivation layer to drive the SEM The present invention provides a defect analysis method of a semiconductor device capable of more accurately analyzing a cause of a defect by adjusting a voltage.
이러한 목적을 달성하기 위한 본 발명에서 반도체 소자의 불량 분석방법은, 폴리이미드 계층을 그라이딩(Grinding)하는 제1과정과, 폴리이미드 계층이 전면 그 라이딩된 후, 페시베이션 계층 일부를 그라이딩하는 제2과정과, 제2과정에서 그라이딩하고 남은 페시베이션 계층을 SEM을 이용하여 불량 포인트를 분석하는 제3과정을 포함하는 것을 특징으로 한다.In the present invention for achieving the above object, the defect analysis method of the semiconductor device, the first process of grinding the polyimide layer (Grinding), and after the polyimide layer is the entire surface of the grinding passivation layer And a third process of analyzing the defect points using the SEM for the remaining passivation layer after the second process and the second process.
이하, 본 발명의 실시예는 다수개가 존재할 수 있으며, 이하에서 첨부한 도면을 참조하여 바람직한 실시 예에 대하여 상세히 설명하기로 한다. 이 기술 분야의 숙련자라면 이 실시 예를 통해 본 발명의 목적, 특징 및 이점들을 잘 이해하게 될 것이다. Hereinafter, a plurality of embodiments of the present invention may exist, and a preferred embodiment will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate the objects, features and advantages of the present invention through this embodiment.
도 2는 본 발명에 따른 반도체 소자의 불량이 발생된 탑 메탈 라인에 대하여 Grinding 후의 단면도이다.2 is a cross-sectional view after grinding for the top metal line in which the defect of the semiconductor device according to the present invention occurs.
먼저, 도 1은 반도체 소자의 불량이 발생된 탑 메탈 라인에 대하여 Grinding 하기 전의 단면도로서, 이에 대하여 설명하면 다음과 같다. 먼저, 다층의 메탈 계층 라인(S1)이 형성되어 있고, 이러한 메탈 계층 라인 상부에 스크래치 및 모이스춰(Moisture)를 방지하기 위해 페시베이션 계층(S2,S3)을 증착한다. 여기서, 페시베이션 계층은 PE-산화막(S2)/PE-질화막(S3)으로 이루어져 있다.First, FIG. 1 is a cross-sectional view before grinding of a top metal line in which a defect of a semiconductor device is generated. First, multilayer metal layer lines S1 are formed, and passivation layers S2 and S3 are deposited on the metal layer lines to prevent scratches and moisture. Here, the passivation layer is composed of a PE oxide film (S2) / PE nitride film (S3).
이어서, 페시베이션 계층(S2,S3) 상부에 폴리이미드 계층(S4)을 증착한다.Subsequently, a polyimide layer S4 is deposited on the passivation layers S2 and S3.
본 발명에 따라 그라인더(Grinder)를 이용하여 먼저, 도 1에 도시된 폴리이미드 계층(S4)을 일정 시간동안 그라이딩(Grinding)하여 전면 제거한다. 여기서, 그라이딩은, 예로서, 40Rpm의 속도, 0.05㎛의 슬러리를 이용하여 15분(min)동안 진행된다. First, using a grinder according to the present invention, first, the polyimide layer S4 illustrated in FIG. 1 is ground for a predetermined time to remove the entire surface. Here, the gliding proceeds for 15 minutes using, for example, a slurry of 0.05 µm at a rate of 40 Rpm.
다음으로, 폴리이미드 계층(S4)에 대한 그라이딩이 완료된 후, PE-산화막(S2)/PE-질화막(S3)으로 이루어진 페시베이션 계층을 일정 시간동안 그라이딩하여 95%를 제거한다. 여기서, 그라이딩은, 예로서, 40Rpm의 속도, 0.05㎛의 슬러리를 이용하며 10분(min)동안 진행된다. Next, after the gradation to the polyimide layer (S4) is completed, the passivation layer consisting of PE-oxide film (S2) / PE-nitride film (S3) is ground for a predetermined time to remove 95%. Here, the gliding proceeds for 10 minutes, using, for example, a slurry of 0.05 μm, a slurry of 0.05 μm.
마지막으로, 도 2에 도시된 바와 같이, 그라이딩에 의해 95%의 페시베이션 계층이 제거되고, 남은, 5%의 페시베이션 계층, 즉 PE-산화막(S5)을 1.5㎚ 이하의 분해로 정확하게 분해할 수 있는 전자 주사 현미경(Scanning Electron Microscopy, SEM)의 구동 전압을 임의의 전압으로 다운 조절할 경우, 빛의 굴절율이 최소화됨에 따라 다층의 메탈 계층 라인 상부에 발생된 불량 포인트, 즉 쇼트 현상(S6)을 도 3에 도시된 바와 같이, 정확하게 관찰(분석)할 수 있다. 여기서, SEM의 구동 전압은, 노멀(normal)일 경우, 200V에 의해 구동되지만, 다층의 메탈 계층 라인 상부에 발생된 불량 포인트, 즉 쇼트 현상을 정확하게 분석하기 위해 -40V 내지 20V의 구동 전압으로 조절한다. Finally, as shown in Fig. 2, 95% of the passivation layer is removed by gliding, and the remaining 5% of the passivation layer, that is, the PE-oxide film S5 is accurately decomposed to a resolution of 1.5 nm or less. When adjusting the driving voltage of the scanning electron microscope (SEM) to an arbitrary voltage, the defect point generated on the multi-layered metal layer line as the refractive index of light is minimized, that is, the short phenomenon (S6) As shown in FIG. 3, it can be observed (analyzed) accurately. Here, the driving voltage of the SEM is driven by 200V when it is normal, but is adjusted to a driving voltage of -40V to 20V to accurately analyze a defect point, that is, a short phenomenon occurring on the multilayer metal layer line. do.
따라서, 그라인더(Grinder)를 이용하여 폴리이미드 계층 및 페시베이션 계층 일부분(95%)을 제거하고, 제거하고 남은 페시베이션 계층의 일부분(5%)을 SEM의 구동 전압을 조절하여 불량 원인을 보다 정확하게 분석함으로써, 불량의 원인을 보다 명확하게 규명하여 공정 파트(part)에 피드백(feedback)하여 공정의 이상 유무 및 장비의 이상 유무 확인으로 반도체 수율을 향상시킬 수 있다. Therefore, the grinder is used to remove a portion of the polyimide layer and passivation layer (95%), and to remove the remaining portion of the passivation layer (5%) by adjusting the driving voltage of the SEM to more accurately determine the cause of the defect. By analyzing, it is possible to more clearly identify the cause of the defect and to feed back to the process part to improve the semiconductor yield by confirming the abnormality of the process and the abnormality of the equipment.
또한, 본 발명의 사상 및 특허청구범위 내에서 권리로서 개시하고 있으므로, 본원 발명은 일반적인 원리들을 이용한 임의의 변형, 이용 및/또는 개작을 포함할 수도 있으며, 본 명세서의 설명으로부터 벗어나는 사항으로서 본 발명이 속하는 업계에서 공지 또는 관습적 실시의 범위에 해당하고 또한 첨부된 특허청구범위의 제한 범위내에 포함되는 모든 사항을 포함한다. In addition, since the present invention is disclosed as a right within the spirit and claims of the present invention, the present invention may include any modification, use and / or adaptation using general principles, and the present invention as a matter deviating from the description of the present specification. It includes all matter falling within the scope of known or customary practice in the art to which it belongs and falling within the scope of the appended claims.
상기에서 설명한 바와 같이, 본 발명은 그라인더(Grinder)를 이용하여 폴리이미드 계층 및 페시베이션 계층 일부분을 제거하고, 제거하고 남은 페시베이션 계층의 일부분을 SEM의 구동 전압을 조절하여 불량 원인을 보다 정확하게 분석함으로써, 불량의 원인을 보다 명확하게 규명하여 공정 파트에 피드백하여 공정의 이상 유무 및 장비의 이상 유무 확인으로 반도체 수율을 향상시킬 수 있는 효과가 있다. As described above, the present invention removes a portion of the polyimide layer and the passivation layer by using a grinder, and controls the driving voltage of the SEM to remove a portion of the remaining passivation layer to more accurately analyze the cause of the defect. As a result, the cause of the defects can be more clearly identified and fed back to the process parts to improve the semiconductor yield by checking for abnormalities in the process and abnormalities in the equipment.
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Cited By (3)
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KR101966017B1 (en) | 2018-09-13 | 2019-04-04 | 오민섭 | Grinding control method and equipment for defect analysis of semiconductor device |
CN112179915A (en) * | 2019-07-04 | 2021-01-05 | 深圳长城开发科技股份有限公司 | Layer removing method for positioning damage points in bare chip |
CN116230528A (en) * | 2023-03-24 | 2023-06-06 | 胜科纳米(苏州)股份有限公司 | Chip delamination method |
-
2004
- 2004-08-18 KR KR1020040065142A patent/KR20060016630A/en not_active Application Discontinuation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101966017B1 (en) | 2018-09-13 | 2019-04-04 | 오민섭 | Grinding control method and equipment for defect analysis of semiconductor device |
CN112179915A (en) * | 2019-07-04 | 2021-01-05 | 深圳长城开发科技股份有限公司 | Layer removing method for positioning damage points in bare chip |
CN116230528A (en) * | 2023-03-24 | 2023-06-06 | 胜科纳米(苏州)股份有限公司 | Chip delamination method |
CN116230528B (en) * | 2023-03-24 | 2024-01-09 | 胜科纳米(苏州)股份有限公司 | Chip delamination method |
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