KR20140031731A - Bonding wire for semiconductor devices and method of manufacturing the same - Google Patents

Bonding wire for semiconductor devices and method of manufacturing the same Download PDF

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Publication number
KR20140031731A
KR20140031731A KR1020120098414A KR20120098414A KR20140031731A KR 20140031731 A KR20140031731 A KR 20140031731A KR 1020120098414 A KR1020120098414 A KR 1020120098414A KR 20120098414 A KR20120098414 A KR 20120098414A KR 20140031731 A KR20140031731 A KR 20140031731A
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KR
South Korea
Prior art keywords
skin layer
metal
core material
bonding wire
silver
Prior art date
Application number
KR1020120098414A
Other languages
Korean (ko)
Other versions
KR101503462B1 (en
Inventor
김상엽
문정탁
홍성재
김승현
Original Assignee
엠케이전자 주식회사
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Application filed by 엠케이전자 주식회사 filed Critical 엠케이전자 주식회사
Priority to KR1020120098414A priority Critical patent/KR101503462B1/en
Priority to PCT/KR2013/007983 priority patent/WO2014038850A1/en
Priority to CN201380057629.3A priority patent/CN104781920A/en
Publication of KR20140031731A publication Critical patent/KR20140031731A/en
Application granted granted Critical
Publication of KR101503462B1 publication Critical patent/KR101503462B1/en
Priority to PH12015500640A priority patent/PH12015500640A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
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    • H01L24/42—Wire connectors; Manufacturing methods related thereto
    • H01L24/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • H01L24/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0233—Sheets, foils
    • B23K35/0238—Sheets, foils layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/302—Cu as the principal constituent
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    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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    • B23K35/40—Making wire or rods for soldering or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
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Abstract

The present invention relates to a bonding wire for semiconductor devices and a method of manufacturing the same. More particularly, the present invention provides a method of manufacturing a bonding wire which includes a step of forming a first surface layer which is made of a second metal as a main element on a core material which is made of a first metal layer as a main element; a step of drawing the core material formed with the first surface layer; and a step of forming a second surface layer which is made of a third metal layer as a main element on the first surface and the drawn core material. By using the bonding wire for semiconductor devices and the method of manufacturing the same, the exposure of the core material is prevented, damage to a chip can be reduced, and acid resistance and second bondability can be improved. [Reference numerals] (AA) Start; (BB) End; (S1) Forming a first surface layer on a core material; (S2) Drawing the core material formed with the first surface layer; (S3) Forming a second surface layer on the core material and the first surface

Description

반도체 장치용 본딩 와이어 및 그의 제조 방법 {Bonding wire for semiconductor devices and method of manufacturing the same}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bonding wire for a semiconductor device,

본 발명은 반도체 장치용 본딩 와이어 및 그의 제조 방법에 관한 것으로서 심재의 노출을 방지하면서 칩의 손상을 줄일 수 있고, 내산성과 세컨드 쪽의 접합성을 향상시킬 수 있는 반도체 장치용 본딩 와이어 및 그의 제조 방법에 관한 것이다.The present invention relates to a bonding wire for a semiconductor device and a method of manufacturing the same, and more particularly, to a bonding wire for a semiconductor device and a method of manufacturing the same, which can reduce damages of a chip while preventing exposure of a core material and improve acid resistance and second bonding property .

반도체 장치를 실장하기 위한 패키지에는 다양한 구조들이 존재하며, 기판과 반도체 장치를 연결하거나 반도체 장치들 사이를 연결하기 위하여 본딩 와이어가 여전히 널리 사용되고 있다. 본딩 와이어로서는 금 본딩 와이어가 많이 사용되었으나 고가일 뿐만 아니라 최근 가격이 급상승하였기 때문에 이를 대체할 수 있는 본딩 와이어에 대한 요구가 있다.BACKGROUND ART [0002] There are various structures in a package for mounting a semiconductor device, and bonding wires are still widely used for connecting a substrate to a semiconductor device or for connecting between semiconductor devices. Although gold bonding wires are widely used as bonding wires, there is a demand for bonding wires that can replace them because they are expensive and recent prices have increased rapidly.

금 본딩 와이어를 대체하기 위하여 많은 연구 노력이 기울여지고 있는데, 구리 본딩 와이어에 대한 관심이 높다. 그런데, 단층의 구리 본딩 와이어는 공기 중에서 쉽게 표면 산화되기 때문에 본딩 패드나 리드와의 접합성에 문제가 발생할 수 있다. 이를 개선하기 위하여 단층의 구리 본딩 와이어의 표면을 다른 금속으로 코팅하는 복층 구리 본딩 와이어가 제안된 바 있다.Much research effort has been devoted to replacing gold bonding wires, and copper bonding wires are of great interest. However, since the single copper bonding wire is easily oxidized in the air, the bonding property with the bonding pad or the lead may be problematic. To improve this, a multilayer copper bonding wire has been proposed in which the surface of a single copper bonding wire is coated with another metal.

그런데, 복층의 구리 본딩 와이어를 제조하기 위하여 구리 심재에 이종의 금속을 형성한 후 신선 공정을 여러 번 수행하다 보면 경우에 따라 이종의 금속이 벗겨져 구리 심재가 노출되는 경우도 있다. 이와 같이 구리 심재가 노출되면 단층의 구리 본딩 와이어와 같은 문제점이 발생할 수 있기 때문에 반도체 장치에 적용하였을 경우 불량의 원인이 될 수 있다.However, in order to manufacture a copper bonding wire having a plurality of layers, when a different kind of metal is formed on the copper core and the drawing process is repeatedly performed, the copper core may be exposed due to the peeling of the different kinds of metal. If the copper core material is exposed in this manner, problems such as a copper bonding wire of a single layer may occur, which may cause defects when applied to a semiconductor device.

또한 복층 구리 본딩 와이어에 대하여 본딩 패드나 리드에 접합되는 접합성을 개선하는 요구도 있는 실정이다.There is also a need to improve the bonding properties of the double-layered copper bonding wire bonded to the bonding pad or lead.

일본 공개특허공보 특개2006-190763호Japanese Patent Application Laid-Open No. 2006-190763

본 발명이 이루고자 하는 첫 번째 기술적 과제는 심재의 노출을 방지하면서 칩의 손상을 줄일 수 있고, 내산성과 세컨드 쪽의 접합성을 향상시킬 수 있는 반도체 장치용 본딩 와이어의 제조 방법을 제공하는 것이다.A first object of the present invention is to provide a method of manufacturing a bonding wire for a semiconductor device capable of reducing chip damage while preventing exposure of a core material and improving acid resistance and bonding at the second side.

본 발명이 이루고자 하는 두 번째 기술적 과제는 심재의 노출을 방지하면서 칩의 손상을 줄일 수 있고, 내산성과 세컨드 쪽의 접합성을 향상시킬 수 있는 반도체 장치용 본딩 와이어를 제공하는 것이다.A second object of the present invention is to provide a bonding wire for a semiconductor device capable of reducing damage to a chip while preventing exposure of a core material and improving acid resistance and bonding at the second side.

본 발명은 상기 첫 번째 기술적 과제를 이루기 위하여, 제1금속을 주성분으로 하는 심재 위에 제2금속을 주성분으로 하는 제1표피층을 형성하는 단계; 제1표피층이 형성된 상기 심재를 신선하는 단계; 및 신선이 완료된 상기 심재 및 상기 제1표피층 위에 제3금속을 주성분으로 하는 제2표피층을 형성하는 단계를 포함하는 반도체 장치용 본딩 와이어의 제조 방법을 제공한다.According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: forming a first skin layer containing a second metal as a main component on a core material having a first metal as a main component; A step of drawing the core material having the first skin layer formed thereon; And forming a second skin layer containing the core and the third metal as main components on the first skin layer and the fresh wire.

여기서, 상기 제1금속은 구리, 은 또는 이들의 합금이고, 상기 제2금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이고, 상기 제3금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이다. 상기 제1금속과 상기 제2금속은 그 성분 또는 조성이 서로 상이하다.Here, the first metal may be copper, silver or an alloy thereof, the second metal may be gold, silver, platinum, palladium, or an alloy thereof, and the third metal may be gold, silver, platinum, . The first metal and the second metal have different compositions or compositions from each other.

또, 상기 제2표피층을 형성하는 단계 이후에는 신선 공정이 2회 이하로 수행될 수 있다. 바람직하게는 상기 제2표피층을 형성하는 단계 이후에 신선 공정이 수행되지 않는 것이 바람직하다.Further, after the step of forming the second skin layer, the drawing process may be performed twice or less. Preferably, the drawing process is not performed after the step of forming the second skin layer.

또, 상기 반도체 장치용 본딩 와이어의 제조 방법은 상기 제2표피층을 형성하는 단계 이후에 상기 제2표피층을 조면화시키는 단계를 더 포함할 수 있다. 이 때, 상기 제2표피층을 조면화시키는 단계는 상기 제2표피층을 플라스마 처리하는 단계를 포함할 수 있다. 상기 제2표피층의 표면의 조도가 약 1 nm 내지 약 6 nm일 수 있다.In addition, the manufacturing method of a bonding wire for a semiconductor device may further include a step of roughening the second skin layer after the step of forming the second skin layer. At this time, the step of roughening the second skin layer may include a step of plasma-treating the second skin layer. The roughness of the surface of the second skin layer may be about 1 nm to about 6 nm.

본 발명은 상기 두 번째 기술적 과제를 이루기 위하여, 제1금속을 주성분으로 하는 심재; 상기 심재의 표면에 형성되고, 상기 제1금속과 성분 또는 조성이 상이한 제2금속을 주성분으로 하는 제1표피층; 및 상기 심재 및 상기 제1표피층을 둘러싸고, 상기 제2금속과 성분 또는 조성이 상이한 제3금속을 주성분으로 하는 제2표피층을 포함하는 반도체 장치용 본딩 와이어를 제공한다.In order to achieve the second technical object of the present invention, there is provided a core material comprising a first metal as a main component; A first skin layer formed on the surface of the core material and containing as a main component a second metal having a different composition or composition from the first metal; And a second skin layer surrounding the core and the first skin layer, the second skin layer being composed mainly of a third metal different in composition or composition from the second metal.

여기서, 상기 제1금속은 구리, 은 또는 이들의 합금이고, 상기 제2금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이고, 상기 제3금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이다. 또한 상기 제2표피층의 표면은 약 1 nm 내지 약 6 nm의 표면 조도(粗度)를 가질 수 있다.Here, the first metal may be copper, silver or an alloy thereof, the second metal may be gold, silver, platinum, palladium, or an alloy thereof, and the third metal may be gold, silver, platinum, . The surface of the second skin layer may have a surface roughness of about 1 nm to about 6 nm.

이 때, 상기 제1표피층 및 상기 제2표피층의 두께의 합은 약 30 nm 내지 약 100 nm일 수 있다. 또한, 상기 제1표피층의 두께는 약 25 nm 내지 약 85 nm일 수 있다.In this case, the sum of the thicknesses of the first skin layer and the second skin layer may be about 30 nm to about 100 nm. Further, the thickness of the first skin layer may be about 25 nm to about 85 nm.

또, 상기 본딩 와이어의 단면적에 대한 상기 제1표피층 및 상기 제2표피층의 단면적의 합의 백분율은 약 0.597% 내지 약 1.97%일 수 있다. 선택적으로, 상기 본딩 와이어의 단면적에 대한 상기 제1표피층 및 상기 제2표피층의 단면적의 합의 백분율은 약 0.993% 내지 약 1.97%일 수 있다. 선택적으로, 상기 본딩 와이어의 단면적에 대한 상기 제1표피층 및 상기 제2표피층의 단면적의 합의 백분율은 약 1.189% 내지 약 1.581%일 수 있다.The percentage of the sum of the cross-sectional areas of the first skin layer and the second skin layer with respect to the cross-sectional area of the bonding wire may be about 0.597% to about 1.97%. Optionally, the percentage of the sum of the cross-sectional areas of the first skin layer and the second skin layer relative to the cross-sectional area of the bonding wire may be about 0.993% to about 1.97%. Optionally, the percentage of the sum of the cross-sectional areas of the first skin layer and the second skin layer relative to the cross-sectional area of the bonding wire may range from about 1.189% to about 1.581%.

또한 본 발명은 상기 두 번째 과제를 이루기 위한 선택적인 구현예로서, 제1금속을 주성분으로 하는 심재; 및 상기 심재의 표면에 형성되고, 상기 제1금속과 성분 또는 조성이 상이한 제2금속을 주성분으로 하는 표피층을 포함하고, 상기 표피층의 표면이 1 nm 내지 6 nm의 표면 조도(粗度)를 갖는 반도체 장치용 본딩 와이어를 제공한다.According to another embodiment of the present invention, there is provided a core material comprising a first metal as a main component; And a skin layer formed on the surface of the core material and containing a second metal having a composition or composition different from that of the first metal as a main component, wherein the surface of the skin layer has a surface roughness of 1 nm to 6 nm A bonding wire for a semiconductor device is provided.

여기서, 상기 제1금속은 구리, 은 또는 이들의 합금이고, 상기 제2금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이다.Here, the first metal is copper, silver or an alloy thereof, and the second metal is gold, silver, platinum, palladium, or an alloy thereof.

본 발명의 본딩 와이어와 그의 제조 방법을 이용하면 심재의 노출을 방지하면서 칩의 손상을 줄일 수 있고, 내산성과 세컨드 쪽의 접합성을 향상시킬 수 있는 효과가 있다.By using the bonding wire of the present invention and the manufacturing method thereof, it is possible to reduce chip damage while preventing exposure of the core material, and to improve the acid resistance and the bonding property to the second side.

도 1 및 도 2는 본 발명의 일 실시예들에 따른 본딩 와이어의 단면을 나타낸 개념도들이다.
도 3은 본 발명의 일 실시예에 따른 본딩 와이어의 제조 방법을 순서에 따라 나타낸 흐름도이다.1 and 2 are conceptual views illustrating cross-sections of a bonding wire according to one embodiment of the present invention.
3 is a flowchart illustrating a method of manufacturing a bonding wire according to an embodiment of the present invention.

이하, 첨부도면을 참조하여 본 발명 개념의 바람직한 실시예들을 상세히 설명하기로 한다. 그러나, 본 발명 개념의 실시예들은 여러 가지 다른 형태로 변형될 수 있으며, 본 발명 개념의 범위가 아래에서 상술하는 실시예들로 인해 한정되어지는 것으로 해석되어져서는 안 된다. 본 발명 개념의 실시예들은 당 업계에서 평균적인 지식을 가진 자에게 본 발명 개념을 보다 완전하게 설명하기 위해서 제공되어지는 것으로 해석되는 것이 바람직하다. 동일한 부호는 시종 동일한 요소를 의미한다. 나아가, 도면에서의 다양한 요소와 영역은 개략적으로 그려진 것이다. 따라서, 본 발명 개념은 첨부한 도면에 그려진 상대적인 크기나 간격에 의해 제한되어지지 않는다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the inventive concept may be modified in various other forms, and the scope of the present invention should not be construed as being limited by the embodiments described below. Embodiments of the inventive concept are desirably construed as providing a more complete understanding of the inventive concept to those skilled in the art. The same reference numerals denote the same elements at all times. Further, various elements and regions in the drawings are schematically drawn. Accordingly, the inventive concept is not limited by the relative size or spacing depicted in the accompanying drawings.

제1, 제2 등의 용어는 다양한 구성 요소들을 설명하는 데 사용될 수 있지만, 상기 구성 요소들은 상기 용어들에 의해 한정되지 않는다. 상기 용어들은 하나의 구성 요소를 다른 구성 요소로부터 구별하는 목적으로만 사용된다. 예를 들어, 본 발명 개념의 권리 범위를 벗어나지 않으면서 제 1 구성 요소는 제 2 구성 요소로 명명될 수 있고, 반대로 제 2 구성 요소는 제 1 구성 요소로 명명될 수 있다.The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and conversely, the second component may be referred to as a first component.

본 출원에서 사용한 용어는 단지 특정한 실시예들을 설명하기 위해 사용된 것으로서, 본 발명 개념을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. 본 출원에서, "포함한다" 또는 "갖는다" 등의 표현은 명세서에 기재된 특징, 개수, 단계, 동작, 구성 요소, 부분품 또는 이들을 조합한 것이 존재함을 지정하려는 것이지, 하나 또는 그 이상의 다른 특징들이나 개수, 동작, 구성 요소, 부분품 또는 이들을 조합한 것들의 존재 또는 부가 가능성을 미리 배제하지 않는 것으로 이해되어야 한다.The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the inventive concept. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the expressions "comprising" or "having ", etc. are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, It is to be understood that the invention does not preclude the presence or addition of one or more other features, integers, operations, components, parts, or combinations thereof.

달리 정의되지 않는 한, 여기에 사용되는 모든 용어들은 기술 용어와 과학 용어를 포함하여 본 발명 개념이 속하는 기술 분야에서 통상의 지식을 가진 자가 공통적으로 이해하고 있는 바와 동일한 의미를 지닌다. 또한, 통상적으로 사용되는, 사전에 정의된 바와 같은 용어들은 관련되는 기술의 맥락에서 이들이 의미하는 바와 일관되는 의미를 갖는 것으로 해석되어야 하며, 여기에 명시적으로 정의하지 않는 한 과도하게 형식적인 의미로 해석되어서는 아니 될 것임은 이해될 것이다.Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the inventive concept belongs, including technical terms and scientific terms. In addition, commonly used, predefined terms are to be interpreted as having a meaning consistent with what they mean in the context of the relevant art, and unless otherwise expressly defined, have an overly formal meaning It will be understood that it will not be interpreted.

도 1은 본 발명의 일 실시예에 따른 반도체 장치용 본딩 와이어의 단면을 나타낸 개념도이다.1 is a conceptual view showing a cross section of a bonding wire for a semiconductor device according to an embodiment of the present invention.

도 1을 참조하면, 본 발명의 일 실시예에 따른 반도체 장치용 본딩 와이어(100)는 3 개의 층을 포함하여 이루어질 수 있다. 즉, 제1금속을 주성분으로 하는 심재(110), 상기 심재(110)의 표면에 형성되고 제2금속을 주성분으로 하는 제1표피층(120), 그리고 상기 심재(110) 및 상기 제1표피층(120)을 둘러싸고 제3금속을 주성분으로 하는 제2표피층(130)을 포함할 수 있다.Referring to FIG. 1, a bonding wire 100 for a semiconductor device according to an embodiment of the present invention may include three layers. The first skin layer 120 is formed on the surface of the core material 110 and includes a second metal as a main component. The core layer 110 and the first skin layer 120 120, and a second skin layer 130 containing a third metal as a main component.

여기서 "주성분"이라 함은 해당 금속의 농도의 비율이 50 몰% 이상인 것을 의미한다.Here, the term "main component" means that the ratio of the concentration of the metal is 50 mol% or more.

상기 제1금속은 구리(Cu), 은(Ag), 또는 이들의 합금일 수 있다. 상기 제2금속과 제3금속은 각각 독립적으로 금(Au), 은(Ag), 백금(Pt), 팔라듐(Pd), 또는 이들 중 2종 이상의 합금일 수 있다. 또한, 상기 제1금속은 상기 제2금속과 성분 또는 조성이 상이하다. 상기 제2금속은 상기 제3금속과 성분과 조성이 동일할 수도 있고 상이할 수도 있다. 상기 제2금속이 상기 제3금속과 성분 및 조성이 동일한 경우는 제1표피층(120)과 제2표피층(130)의 계면이 식별되지 않을 수 있는데, 이러한 경우 여기서는 상기 제1표피층(120)과 제2표피층(130)을 묶어서 표피층(140)으로 지칭한다.The first metal may be copper (Cu), silver (Ag), or an alloy thereof. The second metal and the third metal may each independently be gold (Au), silver (Ag), platinum (Pt), palladium (Pd), or an alloy of two or more of them. Further, the first metal is different in composition or composition from the second metal. The second metal may have the same composition as the third metal and the components and may be different. If the second metal has the same composition and composition as the third metal, the interface between the first skin layer 120 and the second skin layer 130 may not be identified. In this case, The second skin layer 130 is bundled and referred to as the skin layer 140.

상기 제1표피층(120)은 상기 심재(110)를 완전히 둘러쌀 수도 있고, 상기 심재(110)를 둘러싸지 않는 부분이 부분적으로 존재할 수도 있다. 도 2는 제1표피층(120)이 심재(110)를 둘러싸지 않는 부분이 부분적으로 존재하는 본딩 와이어(100a)의 실시예를 나타내는 단면이다. 도 2를 참조하면, 제1표피층(120)이 심재(110)의 둘레 전체를 피복하고 있지 않고 부분적으로 제1표피층(120)의 외부로 노출되어 있다. 그러나, 심재(110)의 노출된 부분이 제2표피층(130)에 의하여 피복되어 있기 때문에 공기 중에서 심재(110)가 산화되어 산화물 피막이 생기는 것을 방지할 수 있다.The first skin layer 120 may surround the core 110 completely or may partially surround the core 110. 2 is a cross-sectional view showing an embodiment of a bonding wire 100a in which a portion of the first skin layer 120 that does not surround the core member 110 is partially present. Referring to FIG. 2, the first skin layer 120 does not cover the entire circumference of the core 110 but is partially exposed to the outside of the first skin layer 120. However, since the exposed portion of the core material 110 is covered with the second skin layer 130, it is possible to prevent the core material 110 from being oxidized to form an oxide film.

상기 심재(110)의 표면 임의의 지점에서의 상기 제1표피층(120) 및 상기 제2표피층(130)의 두께의 합은 약 30 nm 내지 약 100 nm일 수 있다. 상기 제1표피층(120) 및 상기 제2표피층(130)의 두께의 합이 너무 얇은 경우에는 스티치(stitch) 본딩이 이루어지는 세컨드 쪽의 접합성이 불량해질 수 있다. 또한, 상기 제1표피층(120) 및 상기 제2표피층(130)의 두께의 합이 너무 두꺼운 경우에는 볼 본딩되는 부위를 손상시킬 수 있다. 여기서 '세컨드 쪽'이라 함은 본딩 와이어가 연결하고자 하는 두 단자 중 나중에 연결되는 쪽을 말하며, 일반적으로 스티치 본딩 방식에 의하여 접속된다.The sum of the thicknesses of the first skin layer 120 and the second skin layer 130 at any point on the surface of the core material 110 may be about 30 nm to about 100 nm. If the sum of the thicknesses of the first skin layer 120 and the second skin layer 130 is too small, the bonding property at the second side where stitch bonding is performed may be poor. In addition, if the sum of the thicknesses of the first skin layer 120 and the second skin layer 130 is too large, the ball bonding part may be damaged. Here, the term 'second side' refers to a side of the two terminals to which a bonding wire is to be connected later, and is generally connected by a stitch bonding method.

특히, 상기 제1표피층(120)의 두께는 약 25 nm 내지 약 85 nm일 수 있다. 상기 제1표피층(120)과의 두께가 일정하지 않은 경우에는 가장 두꺼운 부분의 두께가 약 25 nm 내지 약 85 nm일 수 있다. 상기 제1표피층(120)의 두께가 과도하게 얇으면 신선 과정에서 제1표피층(120)이 심재로부터 박리될 우려가 있고, 추후에 형성하는 제2표피층(130)이 불안정하게 형성될 수 있다. 또, 상기 제1표피층(120)의 두께가 과도하게 두꺼우면 볼 본딩되는 부위를 손상시킬 수 있다.In particular, the thickness of the first skin layer 120 may be about 25 nm to about 85 nm. When the thickness of the first skin layer 120 is not constant, the thickness of the thickest portion may be about 25 nm to about 85 nm. If the thickness of the first skin layer 120 is excessively thin, the first skin layer 120 may peel off from the core material during the drawing process, and the second skin layer 130 to be formed later may be unstably formed. If the thickness of the first skin layer 120 is excessively large, the ball bonding part may be damaged.

상기 제2표피층(130)의 표면(132)은 조면화되어(roughened) 있을 수 있다. 이와 같이 제2표피층(130)의 표면(132)을 조면화하면 특히 세컨드 쪽에서의 접합성을 개선할 수 있다. 상기 제2표피층(130)의 표면이 조면화된 정도, 즉 조도(粗度, roughness)는 약 1 nm 내지 약 6 nm일 수 있다. 또는 상기 조도는 약 1 nm 내지 약 4 nm일 수 있다. 상기 조도가 너무 작으면 접합성을 개선하는 효과가 미미해져서 바람직하지 않고, 반대로 상기 조도가 너무 크면 제2표피층(130)이 손상되어 제1표피층(120) 또는 심재(110)가 노출될 우려가 있기 때문에 바람직하지 않다.The surface 132 of the second skin layer 130 may be roughened. As described above, when the surface 132 of the second skin layer 130 is roughened, the bonding property particularly in the second side can be improved. The roughness of the surface of the second skin layer 130 may be about 1 nm to about 6 nm. Or the roughness may be from about 1 nm to about 4 nm. If the roughness is too small, the effect of improving the bonding property becomes insignificant. On the other hand, if the roughness is too large, the second skin layer 130 may be damaged and the first skin layer 120 or the core material 110 may be exposed Which is undesirable.

앞서 언급한 바와 같이 상기 심재(110)는 구리, 은 또는 이들의 합금일 수 있는데, 미량의 합금 원소를 추가적으로 첨가함으로써 본딩 와이어의 특성이 개선될 수 있다. 예를 들면, 상기 심재(110)는 지르코늄(Zr), 비스무트(Bi), 인(P), 붕소(B), 이리듐(Ir), 주석(Sn), 몰리브덴(Mo) 및 희토류 원소로 구성되는 군으로부터 선택되는 1종 이상의 원소를 그 총계로 0.002 내지 0.05 몰% 포함할 수 있다.As described above, the core member 110 may be copper, silver, or an alloy thereof, and the characteristics of the bonding wire may be improved by additionally adding a small amount of an alloy element. For example, the core material 110 may be made of zirconium (Zr), bismuth (Bi), phosphorous (P), boron (B), iridium (Ir), tin (Sn), molybdenum And 0.002 to 0.05 mol% of the total of at least one element selected from the group consisting of

상기 본딩 와이어(100, 100a)의 심재(110), 제1표피층(120), 제2표피층(130)이 서로 접촉하는 계면의 근방에는 해당 성분들이 상호 확산되어 농도 구배를 이루는 영역이 형성되어 있을 수 있다. 농도 구배를 갖는 이러한 확산층은 신선 또는 열처리에 의하여 생성될 수 있다. 앞서 언급한 바와 같이 "주성분"은 해당 금속의 농도의 비율이 50 몰% 이상인 것을 의미하므로 확산층 내에서도 제1금속의 농도가 50몰% 이상이면 심선의 영역에 속하는 것으로 간주하고, 제2금속의 농도가 50 몰% 이상이면 제1표피층에 속하는 것으로 간주한다. 그리고 제3금속의 농도가 50 몰% 이상이면 제2표피층에 속하는 것으로 간주한다.In the vicinity of the interface between the bonding wires 100 and 100a where the core 110, the first skin layer 120 and the second skin layer 130 are in contact with each other, the components are mutually diffused to form a concentration gradient region . Such a diffusion layer with a concentration gradient can be produced by drawing or heat treatment. As described above, the "main component" means that the ratio of the metal concentration is 50 mol% or more. Therefore, if the concentration of the first metal is 50 mol% or more in the diffusion layer, Is at least 50 mol%, it is regarded as belonging to the first skin layer. If the concentration of the third metal is 50 mol% or more, it is regarded as belonging to the second skin layer.

따라서 본딩 와이어(100, 100a) 단면의 임의의 특정 지점이 심재(110), 제1표피층(120), 및 제2표피층(130)의 어느 영역에 속하는지 판정할 수 있다. 이를 판정하기 위하여 당 기술분야에 알려진 임의의 방법을 이용하여 해당 특정 지점의 성분 및 농도를 분석할 수 있다. 예를 들면, 본딩 와이어(100, 100a)의 표면으로부터 스퍼터링에 의하여 깊이 방향으로 파고 들어가면서 분석하는 방법, 또는 와이어 단면에서의 라인 분석 또는 점 분석 등을 이용할 수 있다.Therefore, it is possible to determine which specific area of the cross section of the bonding wires 100, 100a belongs to the core 110, the first skin layer 120, and the second skin layer 130. To determine this, any of the methods known in the art may be used to analyze the composition and concentration of that particular point. For example, it is possible to use a method of analyzing from the surface of the bonding wires 100, 100a by sputtering in the depth direction, a line analysis or a point analysis in a wire cross section.

스퍼터링 방법은 제1표피층(120) 및 제2표피층(130)이 얇은 경우에는 효과적이나 두꺼운 경우에는 측정 시간이 과도하게 걸릴 수 있다. 와이어 단면에서의 라인 분석 또는 점 분석은 제1표피층(120) 및 제2표피층(130)이 얇은 경우에는 정밀도가 떨어지지만 제1표피층(120) 및 제2표피층(130)이 두꺼우면 단면 전체의 농도 분포나 여러 부분에서의 재현성의 확인 등이 용이한 장점이 있다. 농도 분석에 이용하는 분석 장치로는 전자선 마이크로 분석법(EPMA), 에너지 분산형 X선 분석법(EDX), 오제 분광 분석법(AES), 투과 전자 현미경(TEM) 등을 이용할 수 있다. 특히 오제 분광 분석법은 공간 분해 능력이 높기 때문에 최표면의 얇은 영역의 농도 분석에 적합하다.The sputtering method is effective when the first skin layer 120 and the second skin layer 130 are thin, but excessive time may be required when the second skin layer 130 is thick. Line analysis or point analysis on the wire cross section is not accurate when the first skin layer 120 and the second skin layer 130 are thin, but when the first skin layer 120 and the second skin layer 130 are thick, It is easy to confirm the concentration distribution and reproducibility in various parts. Electron beam microanalysis (EPMA), energy dispersive X-ray analysis (EDX), Auger spectroscopy (AES), transmission electron microscope (TEM) and the like can be used as the analyzing apparatus used for the concentration analysis. Especially, Oze spectroscopy is suitable for analyzing the concentration of the thinned region of the top surface because of its high spatial resolution ability.

이상에서 설명한 방법들을 이용하여 제1표피층(120) 및 제2표피층(130)의 두께를 측정할 수 있다. 나아가, 이와 같이 측정된 두께를 이용하여 제1표피층(120) 및 제2표피층(130) 각각의 단면적 및 전체 본딩 와이어의 단면적을 구할 수 있다.The thicknesses of the first skin layer 120 and the second skin layer 130 can be measured using the methods described above. Further, the cross-sectional area of each of the first skin layer 120 and the second skin layer 130 and the cross-sectional area of the entire bonding wire can be obtained using the measured thickness.

이와 같이 측정하여 구한 본딩 와이어(100, 100a)의 전체 단면적에 대한 제1표피층(120) 및 제2표피층(130)의 단면적의 합의 백분율은 약 0.597% 내지 약 1.97%일 수 있다. 특히 본딩 와이어(100, 100a)의 전체 단면적에 대한 제1표피층(120) 및 제2표피층(130)의 단면적의 합의 백분율은 약 0.993% 내지 약 1.97%일 수 있다. 또는, 선택적으로 본딩 와이어(100, 100a)의 전체 단면적에 대한 제1표피층(120) 및 제2표피층(130)의 단면적의 합의 백분율은 약 1.189% 내지 약 1.581%일 수 있다.The percentage of the sum of the cross-sectional areas of the first skin layer 120 and the second skin layer 130 with respect to the total cross-sectional area of the bonding wires 100 and 100a measured as described above may be about 0.597% to about 1.97%. The percentage of the sum of the cross-sectional areas of the first skin layer 120 and the second skin layer 130 with respect to the total cross-sectional area of the bonding wires 100, 100a may be about 0.993% to about 1.97%. Alternatively, the percentage of the sum of the cross-sectional areas of the first skin layer 120 and the second skin layer 130 relative to the total cross-sectional area of the bonding wires 100, 100a may be about 1.189% to about 1.581%.

도 3은 본 발명의 일 실시예에 따른 본딩 와이어의 제조 방법을 나타낸 흐름도이다. 이하에서는 도 3을 참조하여 본 발명의 일 실시예에 따른 본딩 와이어의 제조 방법을 설명한다. 먼저 제1금속을 주성분으로 하는 심재를 제공한다. 상기 제1금속은 앞서 설명한 바와 같이 구리(Cu), 은(Ag), 또는 이들의 합금일 수 있다. 제1금속을 주성분으로 하는 심재를 신선 및/또는 열처리하여, 예를 들면, 약 100㎛의 직경을 갖도록 가공한다.3 is a flowchart illustrating a method of manufacturing a bonding wire according to an embodiment of the present invention. Hereinafter, a method of manufacturing a bonding wire according to an embodiment of the present invention will be described with reference to FIG. First, a core material containing a first metal as a main component is provided. The first metal may be copper (Cu), silver (Ag), or an alloy thereof as described above. The core material containing the first metal as a main component is drawn and / or heat treated to have a diameter of, for example, about 100 탆.

그런 다음, 상기 제1금속을 주성분으로 하는 심재 위에 제2금속을 주성분으로 하는 제1표피층을 형성한다(S1). 심재 위에 제1표피층을 형성하는 방법은, 예를 들면, 도금법, 증착법, 용융법 등을 이용할 수 있다. 도금법으로는 전해 도금을 이용할 수도 있고 무전해 도금을 이용할 수도 있다. 전해 도금 중에서는 특히 스트라이크 도금, 또는 플래시 도금을 이용할 수 있다. 전해 도금은 도금 속도가 빠르고, 하지층과의 밀착성도 양호하다. 무전해 도금에 사용되는 용액은 치환형과 환원형으로 분류될 수 있는데, 얇은 막을 형성할 때에는 치환형 도금만으로도 충분하지만 두꺼운 막을 형성할 때에는 치환형 도금 후에 환원형 도금을 추가적으로 실시하는 것이 바람직하다.Then, a first skin layer containing a second metal as a main component is formed on a core material mainly composed of the first metal (S1). As a method for forming the first skin layer on the core material, for example, a plating method, a vapor deposition method, a melting method, or the like can be used. As the plating method, electrolytic plating may be used, or electroless plating may be used. Among electroplating, strike plating or flash plating can be used. Electrolytic plating has a high plating speed and good adhesion with the underlayer. The solution used for the electroless plating may be classified into a substitution type and a reduction type. When a thin film is formed, substitution type plating is sufficient. However, when forming a thick film, it is preferable to perform reduction type plating after substitution type plating.

증착법으로는 스퍼터링 방법, 이온도금법, 진공 증착 등의 물리 기상 증착 방법, 또는 플라즈마 강화 화학 기상 증착과 같은 화학 기상 증착 방법을 이용할 수 있다. 증착법을 이용하면 막 형성 후에 세정이 불필요하기 때문에 세정에 따른 오염의 문제가 발생하지 않는다.As the deposition method, a physical vapor deposition method such as a sputtering method, an ion plating method, a vacuum deposition method, or a chemical vapor deposition method such as a plasma enhanced chemical vapor deposition method can be used. When the evaporation method is used, since the cleaning is not necessary after the film formation, the problem of contamination due to cleaning does not occur.

용융법은 표피층(제1표피층 및/또는 제2표피층) 또는 심재 중 어느 하나를 용융시켜 주입(鑄入)하는 방법으로서, 용융된 표피층 금속을 미리 제조한 심재의 주위에 주입하여 표피층을 형성함으로써 제조할 수도 있고, 이와는 반대로 미리 제조한 표피층의 중공(中空)형 원주의 중앙부에 심재를 주입함으로써 제조할 수도 있다.The melting method is a method of melting and injecting any one of the skin layer (first skin layer and / or second skin layer) or the core material, wherein the molten skin layer metal is injected around the core material prepared in advance to form a skin layer Alternatively, it may be manufactured by injecting a core material into the center of a hollow circumference of a previously prepared skin layer.

그런 다음, 제1표피층(120)이 형성된 심재를 신선한다(S2). 신선은 여러 단계에 걸쳐서 수행될 수 있고, 예를 들면, 약 20 ㎛의 직경을 갖도록 신선할 수 있다. 필요에 따라 신선하는 도중에 열처리를 수행할 수도 있다. 상기 열처리는 약 400℃ 내지 약 600℃의 온도에서 약 0.001초 내지 약 5초 동안 수행될 수 있다. 또한 상기 열처리는 1회만 수행될 수도 있고, 2회 이상 수행될 수도 있다.Then, the core material in which the first skin layer 120 is formed is fresh (S2). The drawing may be carried out over several steps, for example, to have a diameter of about 20 microns. If necessary, heat treatment may be carried out during the freshness. The heat treatment may be performed at a temperature of from about 400 [deg.] C to about 600 [deg.] C for about 0.001 second to about 5 seconds. Further, the heat treatment may be performed only once or two or more times.

열처리에 의하여 심재(110)와 제1표피층(120) 사이의 계면에서 상호 확산이 있어나 밀착력이 향상될 수 있다. 또한, 열처리 온도가 심재(110)의 재결정온도보다 높고 제1표피층(120)의 재결정온도보다 낮은 온도에서 수행되는 경우 얻어지는 본딩 와이어의 물리적 특성이 개선될 수 있다.The heat treatment causes mutual diffusion at the interface between the core material 110 and the first skin layer 120, and the adhesion can be improved. In addition, when the heat treatment temperature is higher than the recrystallization temperature of the core material 110 and lower than the recrystallization temperature of the first skin layer 120, the physical properties of the obtained bonding wire can be improved.

그런 다음, 상기 심재(110) 및 제1표피층(120)의 위에 제2표피층(130)을 형성한다. 앞서 언급한 바와 같이 제1표피층(120)의 성분 및 조성은 제2표피층(130)의 성분 및 조성과 동일할 수도 있고 상이할 수도 있다. 제2표피층(130)의 두께는 약 5 nm 내지 약 25 nm일 수 있다. 만일 제2표피층(130)의 두께가 너무 얇으면 제1표피층의 신선 중 벗겨진 부분의 보완이 약해져 세컨드 접합성이 나빠질 수 있으며, 또한 본딩 와이어를 이용하여 형성되는 볼의 진구성이 떨어져 편심볼이 발생할 수 있다. 또, 제2표피층(130)의 두께가 너무 두꺼우면 본딩 와이어의 가공성이 나빠질 수 있으며 볼 본딩시 형성되는 볼의 진구성이 떨어질 수 있다.Then, a second skin layer 130 is formed on the core 110 and the first skin layer 120. As described above, the components and compositions of the first skin layer 120 may be the same as or different from those of the second skin layer 130. The thickness of the second skin layer 130 may be about 5 nm to about 25 nm. If the thickness of the second skin layer 130 is too thin, the complement of the peeled portion of the first skin layer may be weakened, and the secondary bonding property may be deteriorated. Also, . In addition, if the thickness of the second skin layer 130 is too large, the workability of the bonding wire may deteriorate and the true configuration of the ball formed at the time of ball bonding may be deteriorated.

제2표피층(130)도 도금법, 증착법, 용융법 등 당 기술분야에서 알려진 방법에 의하여 수행될 수 있고, 앞서 상세하게 설명하였으므로 여기서는 상세한 설명을 생략한다. The second skin layer 130 may be formed by a method known in the art such as a plating method, a vapor deposition method, a melting method, and the like, and detailed description thereof is omitted here.

제2표피층(130)을 형성한 후, 열처리를 더 수행할 수 있다. 상기 열처리는 약 9%의 신장율(elongation)을 갖도록 수행될 수 있다. 이를 위하여, 약 400 ℃ 내지 약 600 ℃의 온도에서 약 0.001초 내지 약 5초 동안 열처리가 수행될 수 있다. 또는 상기 열처리 시간은 약 0.05초 내지 약 3초일 수 있다.After the second skin layer 130 is formed, heat treatment may be further performed. The heat treatment may be performed to have an elongation of about 9%. For this, a heat treatment may be performed at a temperature of about 400 ° C to about 600 ° C for about 0.001 second to about 5 seconds. Or the heat treatment time may be from about 0.05 second to about 3 seconds.

또, 제2표피층(130)을 형성한 후, 필요에 따라 신선을 더 거칠 수도 있다. 그러나, 신선을 다수회 거칠 경우 제2표피층(130)이 벗겨질 우려가 있기 때문에 2회 이하의 횟수로 수행되는 것이 바람직하다. 제2표피층(130)을 형성한 후 신선을 하지 않는 것이 더욱 바람직하다.Further, after the second skin layer 130 is formed, it may be further roughened if necessary. However, since the second skin layer 130 may be peeled off when the drawing is roughly carried out a plurality of times, it is preferable that the second skin layer 130 is performed twice or less. More preferably, after the second skin layer 130 is formed, it is not drawn.

이와 같이 형성된 제2표피층(130)의 표면에 대하여 조면화 처리를 할 수 있다. 조면화된 상기 제2표피층(130)의 조도는 약 1 nm 내지 약 6 nm일 수 있다. 바람직하게, 조면화된 상기 제2표피층(130)의 조도는 약 1 nm 내지 약 4 nm일 수 있다. 상기 조면화 처리는, 예를 들면 상압 플라스마 처리에 의하여 이루어질 수 있다. 상기 상압 플라스마 처리는, 예를 들면, Ar 가스 또는 Ar+H2 혼합 가스를 사용하여 40 W 내지 60 W의 전력을 가하면서 수행될 수 있다.The surface of the second skin layer 130 thus formed can be roughened. The roughness of the roughened second skin layer 130 may be about 1 nm to about 6 nm. Preferably, the roughness of the roughened second skin layer 130 may be from about 1 nm to about 4 nm. The roughening treatment may be performed, for example, by atmospheric pressure plasma treatment. The atmospheric pressure plasma treatment can be performed, for example, by applying an electric power of 40 W to 60 W using an Ar gas or an Ar + H 2 mixed gas.

제2표피층(130)을 형성한 후의 열처리와 조면화 처리는 그 순서가 특별히 한정되지 않고 어느 공정이든 먼저 수행될 수 있다. 선택적으로, 열처리가 복수회 수행되는 경우 조면화 처리를 전후하여 이루어질 수도 있다.The order of the heat treatment and the roughening treatment after the second skin layer 130 is formed is not particularly limited, and any step can be performed first. Alternatively, the roughening treatment may be carried out before or after the heat treatment is performed a plurality of times.

이하, 구체적인 실시예 및 비교예를 가지고 본 발명의 구성 및 효과를 보다 상세히 설명하지만, 이들 실시예는 단지 본 발명을 보다 명확하게 이해시키기 위한 것일 뿐 본 발명의 범위를 한정하고자 하는 것은 아니다.Hereinafter, the structure and effects of the present invention will be described in more detail with specific examples and comparative examples, but these examples are only intended to more clearly understand the present invention and are not intended to limit the scope of the present invention.

<본딩 와이어의 제조><Production of Bonding Wire>

구리 또는 은으로 약 100 ㎛의 직경을 갖는 심재를 준비한 후 심재의 표면에 제1금속을 도금법으로 형성하고 신선 공정을 통해 심재가 20 ㎛의 직경을 갖는 본딩와이어를 얻었다. 그런 다음 그 표면에 제2금속을 도금법으로 형성한 후 신장율이 9%가 되도록 열처리하였다. 열처리 조건은 구체적인 실시예마다 조금씩 상이할 수 있는데 대략 400℃ 내지 600℃의 온도에서 0.001초 내지 5초 동안 열처리할 수 있다. 열처리를 완료한 다음 상압 플라스마를 이용하여 본딩 와이어 표면을 조면화하였다. 상압 플라스마의 파워 조건은 조면화의 정도를 조절하기 위하여 40W 내지 60W 범위에서 조절되었다.A core material having a diameter of about 100 占 퐉 was prepared with copper or silver, a first metal was formed on the surface of the core material by a plating method, and a bonding wire having a core of 20 占 퐉 diameter was obtained through a drawing process. Then, a second metal was formed on the surface by a plating method and then heat-treated so that the elongation percentage was 9%. The heat treatment conditions may be slightly different for each concrete example, and the heat treatment can be performed at a temperature of about 400 ° C to 600 ° C for 0.001 second to 5 seconds. After the heat treatment was completed, the surface of the bonding wire was roughened using atmospheric plasma. The power condition of the atmospheric plasma was adjusted in the range of 40W to 60W to control the degree of roughening.

<표피층 두께 분석>&Lt; Analysis of skin layer thickness &

본딩 와이어 표면의 표피층 두께를 측정하기 위하여 Ar 이온으로 스퍼터링하는 오제 분광 분석법(AES)을 이용하였다. To measure the skin layer thickness on the bonding wire surface, Aus spectroscopy (AES) was used to sputter Ar ions.

<내산성><Acid resistance>

본딩 와이어를 30% 질산에 5분 동안 침지시켰다가 꺼내어 탈이온수로 세정하고 침지 전후의 질량변화가 최초 본딩 와이어 질량의 10% 이내면 우수(●), 10% 내지 25%이면 양호(◐), 25% 초과이면 미흡(○)으로 판정하였다.When the bonding wire is immersed in 30% nitric acid for 5 minutes, it is taken out and cleaned with deionized water. When the change in mass before and after immersion is 10% or less of the initial bonding wire mass (●), 10% to 25% If it is more than 25%, it is judged that it is insufficient (O).

<본딩 와이어 적용 테스트><Bonding wire application test>

제조된 본딩 와이어를 이용하여 K&S Maxum Ultra 장비에서 초음파 열압착 방식으로 볼본딩/스티치본딩 방식의 접합을 하였다. 포밍(forming) 가스 (N2 + 5% H2) 분위기에서 아크 방전에 의해 와이어 말단에 볼을 형성하여 실리콘 기판 상의 1 ㎛ 알루미늄 패드에 퍼스트(first) 접합하고, 이를 연장하여 2 ㎛ Ag 또는 Pd 도금된 220 ℃ 리드 프레임에 웨지 접합을 하였다. Bonding of the ball bonding / stitch bonding method was performed by ultrasonic thermocompression method using K & S Maxum Ultra equipment using the manufactured bonding wire. A ball was formed at the wire end by arc discharge in a forming gas (N 2 + 5% H 2 ) atmosphere, first bonded to a 1 탆 aluminum pad on a silicon substrate and extended to form 2 탆 Ag or Pd Wedge bonding was performed on the plated 220 캜 lead frame.

이와 같이 접합된 본딩 와이어에 대하여 세컨드 접합성 및 칩 크레이터링(cratering) 테스트를 수행하였다.A second bonding property and a chip cratering test were performed on the thus bonded bonding wires.

칩 크레이터링(Chip cratering ( chipchip crateringcratering ))

위에서 설명한 바와 같이 접합된 본딩 와이어에 대하여 알루미늄 패드를 알칼리 용액으로 녹여 제거한 후 알루미늄 패드가 존재하던 위치의 실리콘 기판이 손상되었는지 여부를 관찰하였다. 손상이 없을 경우 우수(●), 손상이 있을 경우에는 미흡(○)으로 판정하였다.As described above, the aluminum pads were dissolved and dissolved in the alkaline solution on the bonded bonding wires, and then it was observed whether or not the silicon substrate in the position where the aluminum pads existed was damaged. It was judged to be excellent (●) when there was no damage, and insufficient (○) when there was damage.

세컨드 접합성Second bonding

스티치 본딩에 대하여 Dage 4000 장비를 사용하여 풀링 테스트를 수행하였다. 세컨드 접합성 테스트의 실행은 상하좌우 동일 위치로 각각의 위치에서 15개소에 대하여 수행하고 얻어진 값을 토대로 에러율 및 Cpk 값을 구하였다.A pulling test was performed on the stitch bonding using a Dage 4000 instrument. Execution of the second jointability test was performed at 15 positions at the same positions in the upper, lower, left, and right positions, and the error rate and the Cpk value were obtained based on the obtained values.

각 실시예에 있어서, 심재, 제1표피층, 제2표피층의 금속 성분, 측정된 표면 조도, 각 표피층의 두께 및 그에 따른 면적 비율을 정리하면 다음 표 1과 같다.In each of the examples, the metal components of the core material, the first skin layer, the second skin layer, the measured surface roughness, the thickness of each skin layer, and the area ratio thereof are summarized in the following Table 1.

[표 1][Table 1]

Figure pat00001
Figure pat00001

또, 각 비교예에 있어서, 심재, 제1표피층, 제2표피층의 금속 성분, 측정된 표면 조도, 각 표피층의 두께 및 그에 따른 면적 비율을 정리하면 다음 표 2와 같다.The metal components of the core material, the first skin layer, the second skin layer, the measured surface roughness, the thickness of each skin layer and the area ratio thereof are summarized in Table 2 below.

[표 2][Table 2]

Figure pat00002
Figure pat00002

위의 각 실시예 및 비교예들에 대하여 칩 크레이터링, 내산성, 세컨드 접합성 및 에러율을 측정하여 하기 표 3 및 표 4에 정리하였다.Chip cratering, acid resistance, second bonding property and error rate were measured for each of the above examples and comparative examples, and they are summarized in Tables 3 and 4 below.

[표 3][Table 3]

Figure pat00003
Figure pat00003

[표 4][Table 4]

Figure pat00004
Figure pat00004

위의 실시예와 비교예의 결과를 살펴보면 본딩 와이어의 표면의 조도가 1 nm 내지 6 nm의 범위 내에 속하면 칩 크레이터링, 내산성 및 세컨드 쪽의 접합성이 모두 우수해 지는 것을 알 수 있었다. 특히, 본딩 와이어 전체의 단면적에 대한 제1표피층 및 제2표피층의 단면적의 합의 백분율이 0.597% 내지 1.97% 이내이면 접합성이 더욱 우수해 지는 것을 확인할 수 있었다.From the results of the above Examples and Comparative Examples, it was found that when the surface roughness of the bonding wire is in the range of 1 nm to 6 nm, chip crating, acid resistance and bonding at the second side are excellent. Particularly, when the percentage of the sum of the cross-sectional areas of the first skin layer and the second skin layer with respect to the cross-sectional area of the entire bonding wire is within 0.597% to 1.97%, the bonding property is more excellent.

이상에서 살펴본 바와 같이 본 발명의 바람직한 실시예에 대해 상세히 기술되었지만, 본 발명이 속하는 기술분야에 있어서 통상의 지식을 가진 사람이라면, 첨부된 청구 범위에 정의된 본 발명의 정신 및 범위를 벗어나지 않으면서 본 발명을 여러 가지로 변형하여 실시할 수 있을 것이다. 따라서 본 발명의 앞으로의 실시예들의 변경은 본 발명의 기술을 벗어날 수 없을 것이다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, The present invention may be modified in various ways. Therefore, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

본 발명은 반도체 산업에 유용하게 이용될 수 있다.The present invention can be usefully used in the semiconductor industry.

100, 100a: 반도체 장치용 본딩 와이어
110: 심재
120: 제1표피층
130: 제2표피100, 100a: bonding wire for semiconductor device
110: heartwood
120: First skin layer
130: second skin

Claims (14)

제1금속을 주성분으로 하는 심재;
상기 심재의 표면에 형성되고, 상기 제1금속과 성분 또는 조성이 상이한 제2금속을 주성분으로 하는 제1표피층; 및
상기 심재 및 상기 제1표피층을 둘러싸고, 상기 제2금속과 성분 또는 조성이 상이한 제3금속을 주성분으로 하는 제2표피층;
을 포함하고,
상기 제1금속은 구리, 은 또는 이들의 합금이고,
상기 제2금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이고,
상기 제3금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이고,
상기 제2표피층의 표면은 1 nm 내지 6 nm의 표면 조도(粗度)를 갖는 반도체 장치용 본딩 와이어.Core material comprising a first metal as a main component;
A first epidermal layer formed on the surface of the core material and mainly comprising a second metal having a component or composition different from the first metal; And
A second skin layer surrounding the core material and the first skin layer and having a third metal having a component or composition different from that of the second metal;
/ RTI &gt;
The first metal is copper, silver or an alloy thereof,
The second metal is gold, silver, platinum, palladium, or an alloy thereof;
The third metal is gold, silver, platinum, palladium, or an alloy thereof;
Wherein the surface of the second skin layer has a surface roughness of 1 nm to 6 nm. 제 1 항에 있어서,
상기 제1표피층 및 상기 제2표피층의 두께의 합이 30 nm 내지 100 nm인 것을 특징으로 하는 반도체 장치용 본딩 와이어.The method of claim 1,
Wherein a sum of thicknesses of the first skin layer and the second skin layer is 30 nm to 100 nm. 제 2 항에 있어서,
상기 제1표피층의 두께가 25 nm 내지 85 nm인 것을 특징으로 하는 반도체 장치용 본딩 와이어.3. The method of claim 2,
Wherein the thickness of the first skin layer is 25 nm to 85 nm. 제 1 항에 있어서,
상기 본딩 와이어의 단면적에 대한 상기 제1표피층 및 상기 제2표피층의 단면적의 합의 백분율이 0.597% 내지 1.97%인 것을 특징으로 하는 반도체 장치용 본딩 와이어.The method of claim 1,
Wherein the percentage of the sum of the cross-sectional areas of the first skin layer and the second skin layer with respect to the cross-sectional area of the bonding wire is 0.597% to 1.97%. 제 1 항에 있어서,
상기 본딩 와이어의 단면적에 대한 상기 제1표피층 및 상기 제2표피층의 단면적의 합의 백분율이 0.993% 내지 1.97%인 것을 특징으로 하는 반도체 장치용 본딩 와이어.The method of claim 1,
Wherein the percentage of the sum of the cross-sectional areas of the first skin layer and the second skin layer with respect to the cross-sectional area of the bonding wire is 0.993% to 1.97%. 제 1 항에 있어서,
상기 본딩 와이어의 단면적에 대한 상기 제1표피층 및 상기 제2표피층의 단면적의 합의 백분율이 1.189% 내지 1.581%인 것을 특징으로 하는 반도체 장치용 본딩 와이어.The method of claim 1,
Wherein the percentage of the sum of the cross-sectional areas of the first skin layer and the second skin layer with respect to the cross-sectional area of the bonding wire is 1.189% to 1.581%. 제1금속을 주성분으로 하는 심재; 및
상기 심재의 표면에 형성되고, 상기 제1금속과 성분 또는 조성이 상이한 제2금속을 주성분으로 하는 표피층;
을 포함하고,
상기 제1금속은 구리, 은 또는 이들의 합금이고,
상기 제2금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이고,
상기 표피층의 표면은 1 nm 내지 6 nm의 표면 조도(粗度)를 갖는 반도체 장치용 본딩 와이어.Core material comprising a first metal as a main component; And
An epidermal layer formed on the surface of the core material and mainly composed of a second metal having a different component or composition than the first metal;
/ RTI &gt;
The first metal is copper, silver or an alloy thereof,
The second metal is gold, silver, platinum, palladium, or an alloy thereof;
Wherein the surface of the skin layer has a surface roughness of 1 nm to 6 nm. 반도체 장치용 본딩 와이어의 제조 방법으로서,
제1금속을 주성분으로 하는 심재 위에 제2금속을 주성분으로 하는 제1표피층을 형성하는 단계;
제1표피층이 형성된 상기 심재를 신선하는 단계; 및
신선이 완료된 상기 심재 및 상기 제1표피층 위에 제3금속을 주성분으로 하는 제2표피층을 형성하는 단계;
를 포함하고,
상기 제1금속은 구리, 은 또는 이들의 합금이고,
상기 제2금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금이고,
상기 제3금속은 금, 은, 백금, 팔라듐, 또는 이들의 합금인 반도체 장치용 본딩 와이어의 제조 방법.A method of manufacturing a bonding wire for a semiconductor device,
Forming a first skin layer including a second metal as a main component on the core material containing the first metal as a main component;
A step of drawing the core material having the first skin layer formed thereon; And
Forming a second skin layer including a third metal as a main component on the core material and the first skin layer on which the drawing is completed;
Lt; / RTI &gt;
The first metal is copper, silver or an alloy thereof,
The second metal is gold, silver, platinum, palladium, or an alloy thereof;
And said third metal is gold, silver, platinum, palladium, or an alloy thereof. 제 8 항에 있어서,
상기 제1금속과 상기 제2금속이 서로 상이한 것을 특징으로 하는 반도체 장치용 본딩 와이어의 제조 방법.The method of claim 8,
A method for manufacturing a bonding wire for a semiconductor device, wherein the first metal and the second metal are different from each other. 제 8 항에 있어서,
상기 제2표피층을 형성하는 단계 이후에 신선 공정이 2회 이하로 수행되는 것을 특징으로 하는 반도체 장치용 본딩 와이어의 제조 방법.The method of claim 8,
Wherein the drawing step is performed twice or less after the step of forming the second skin layer. 제 8 항에 있어서,
상기 제2표피층을 형성하는 단계 이후에는 신선 공정이 수행되지 않는 것을 특징으로 하는 반도체 장치용 본딩 와이어의 제조 방법.The method of claim 8,
And the drawing process is not performed after the step of forming the second skin layer. 제 8 항에 있어서,
상기 제2표피층을 형성하는 단계 이후에 상기 제2표피층을 조면화시키는 단계를 더 포함하는 것을 특징으로 하는 반도체 장치용 본딩 와이어의 제조 방법.The method of claim 8,
And roughening the second skin layer after the forming of the second skin layer. 제 12 항에 있어서,
상기 제2표피층을 조면화시키는 단계가 상기 제2표피층을 플라스마 처리하는 단계를 포함하는 것을 특징으로 하는 반도체 장치용 본딩 와이어의 제조 방법.13. The method of claim 12,
And the step of roughening the second skin layer comprises a step of plasma-treating the second skin layer. 제 12 항에 있어서,
상기 제2표피층의 표면의 조도가 1 nm 내지 6 nm인 것을 특징으로 하는 반도체 장치용 본딩 와이어의 제조 방법.13. The method of claim 12,
The roughness of the surface of the said 2nd skin layer is 1 nm-6 nm, The manufacturing method of the bonding wire for semiconductor devices.
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