JP7430704B2 - Peeling method for temporarily fixed substrates, composite substrates, and electronic components - Google Patents

Peeling method for temporarily fixed substrates, composite substrates, and electronic components Download PDF

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JP7430704B2
JP7430704B2 JP2021509045A JP2021509045A JP7430704B2 JP 7430704 B2 JP7430704 B2 JP 7430704B2 JP 2021509045 A JP2021509045 A JP 2021509045A JP 2021509045 A JP2021509045 A JP 2021509045A JP 7430704 B2 JP7430704 B2 JP 7430704B2
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substrate
temporarily fixed
peripheral part
temporary fixing
light transmittance
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JPWO2020195932A1 (en
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勝 野村
杉夫 宮澤
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NGK Insulators Ltd
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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
    • H01L21/304Mechanical treatment, e.g. grinding, polishing, cutting

Description

本発明は、電子部品を接着し、仮固定するための固定面と、前記固定面の反対側にある底面とを備える仮固定基板に関するものである。 The present invention relates to a temporary fixing board that includes a fixing surface for adhering and temporarily fixing electronic components, and a bottom surface on the opposite side of the fixing surface.

近年、電子部品の小型化、低背化への要求が強まっており、その製造のためのシリコンウェハーについても極端に薄くした状態で用いられるケースが多くなっている。この際、薄くしたシリコンウェハーは剛性が不足し、搬送、研削・研磨といったプロセスに耐えられないため、ガラスやセラミックスからなる仮固定基板を用いる方法が知られている(特許文献1、2、3)。 In recent years, there has been an increasing demand for electronic components to be smaller and lower in profile, and the silicon wafers used to manufacture them are increasingly being used in an extremely thin state. At this time, since thinned silicon wafers lack rigidity and cannot withstand processes such as transportation, grinding, and polishing, methods are known that use temporarily fixed substrates made of glass or ceramics (Patent Documents 1, 2, and 3). ).

これらの従来技術では、熱硬化性樹脂によってシリコンウェハーを支持基板に対して接着、冷却した後、シリコンウェハーを研削・研磨により薄くする。さらにシリコンウェハー表面への多層配線形成等を行い、その後、仮固定基板からシリコンウェハーを剥がし、所望の寸法にダイシングする。剥離の際は、仮固定基板側から接着層に予め設けた剥離層にレーザー光をあてることで行われる。 In these conventional techniques, a silicon wafer is bonded to a support substrate using a thermosetting resin, cooled, and then the silicon wafer is thinned by grinding and polishing. Furthermore, multilayer wiring is formed on the surface of the silicon wafer, and then the silicon wafer is peeled off from the temporarily fixed substrate and diced into desired dimensions. Peeling is performed by irradiating a peeling layer provided in advance on the adhesive layer with a laser beam from the temporarily fixed substrate side.

特開2011-023438JP2011-023438 特開2010-058989JP2010-058989 特許5304112Patent 5304112

しかし、仮固定基板側からレーザー光を照射して、シリコンウェハーから仮固定基板を剥離する際、剥離度合いに仮固定基板の面内でのムラが生ずることがある。この場合には、仮固定基板が、剥離できる部分と剥離できない部分に分かれて、シリコンウェハーが割れることがあった。 However, when the temporary fixed substrate is peeled from the silicon wafer by irradiating laser light from the temporary fixed substrate side, the degree of peeling may be uneven within the surface of the temporary fixed substrate. In this case, the temporarily fixed substrate is divided into a removable part and a non-removable part, and the silicon wafer may be broken.

本発明者は、レーザー光のエネルギーを高くすることで、仮固定基板の全面にわたって剥離を促進することも試みた。しかし、レーザー光のエネルギーを高くすると、シリコンウェハー上の電子部品にダメージを与えるケースがある。 The present inventor also attempted to promote peeling over the entire surface of the temporarily fixed substrate by increasing the energy of the laser beam. However, if the energy of the laser beam is increased, it may damage electronic components on the silicon wafer.

本発明の課題は、仮固定基板に電子部品を仮固定し、仮固定基板側からレーザー光を照射して仮固定基板を剥離させるのに際して、剥離の歩留りを改善することである。 An object of the present invention is to improve the peeling yield when temporarily fixing electronic components to a temporarily fixing substrate and peeling off the temporarily fixing substrate by irradiating a laser beam from the side of the temporarily fixing substrate.

本発明は、電子部品を接着し、仮固定するための固定面と、前記固定面の反対側にある照射面とを備える仮固定基板であって、
前記仮固定基板が外周部と内周部とを有しており、前記内周部の全光線透過率が前記外周部の全光線透過率よりも低く、かつ60%以上であることを特徴とする、仮固定基板に係るものである。
The present invention is a temporary fixing board comprising a fixing surface for adhering and temporarily fixing electronic components, and an irradiation surface on the opposite side of the fixing surface,
The temporary fixing substrate has an outer peripheral part and an inner peripheral part, and the total light transmittance of the inner peripheral part is lower than the total light transmittance of the outer peripheral part, and is 60% or more. This relates to a temporarily fixed board.

また、本発明は、前記仮固定基板、および前記仮固定基板の前記固定面に接着された電子部品を備えていることを特徴とする、複合基板に係るものである。 Further, the present invention relates to a composite board characterized by comprising the temporary fixing substrate and an electronic component adhered to the fixing surface of the temporary fixing substrate.

また、本発明は、前記複合基板に対して前記仮固定基板の前記照射面側からレーザー光を照射することによって、前記電子部品から前記仮固定基板を剥離させることを特徴とする、電子部品の剥離方法に係るものである。 Further, the present invention provides an electronic component, characterized in that the temporary fixing substrate is peeled from the electronic component by irradiating the composite substrate with a laser beam from the irradiation surface side of the temporary fixing substrate. This relates to a peeling method.

本発明者は、仮固定基板上で半導体基板などを接着した後、レーザー光を仮固定基板側から照射して仮固定基板を剥離させるのに際して、半導体基板などに割れが生ずる原因について検討した。この結果、半導体基板などの割れの場所が一定せず、レーザー照射時に、剥離しにくい部分に応力が集中的に加わり、割れの原因になっているものと考えられた。 The present inventor studied the causes of cracks in semiconductor substrates, etc. when a semiconductor substrate or the like is bonded on a temporary fixing substrate and then the temporary fixing substrate is peeled off by irradiating laser light from the temporary fixing substrate side. As a result, the locations of cracks in semiconductor substrates, etc. are not constant, and stress is concentrated in areas that are difficult to peel off during laser irradiation, which is thought to be the cause of cracks.

このため、本発明者は、仮固定基板の内周部の全光線透過率を外周部の全光線透過率よりも低くすることで、仮固定基板側からレーザー光を照射したときに、外周部が内周部よりも先に剥離し易くなるようにしてみた。この結果、剥離が外周部から内周部へと径方向に向かって進行する結果、仮固定基板の接着部分が内周に残り、最後に剥離することになる。この結果、仮固定基板の全面にわたって剥離終了までに割れが生じにくくなることを実験的に確認し、本発明に到達した。 For this reason, the present inventor made the total light transmittance of the inner peripheral part of the temporarily fixed substrate lower than the total light transmittance of the outer peripheral part, so that when the laser beam is irradiated from the temporarily fixed board side, the outer peripheral part I tried to make it easier to peel off first than the inner periphery. As a result, the peeling progresses in the radial direction from the outer periphery to the inner periphery, so that the adhesive portion of the temporarily fixed substrate remains on the inner periphery and is finally peeled off. As a result, it was experimentally confirmed that cracks were less likely to occur over the entire surface of the temporarily fixed substrate by the time the peeling was completed, and the present invention was achieved.

(a)は、仮固定基板2(2A)の固定面2aに接着剤3を設けた状態を示し、(b)は、仮固定基板2(2A)の固定面2aに半導体基板7を接着した状態を示す。(a) shows a state in which the adhesive 3 is provided on the fixing surface 2a of the temporary fixing substrate 2 (2A), and (b) shows a state in which the semiconductor substrate 7 is adhered to the fixing surface 2a of the temporary fixing substrate 2 (2A). Indicates the condition. (a)は、複合基板に対して仮固定基板2(2A)側からレーザー光Aを照射している状態を示し、(b)は、半導体基板7を仮固定基板2(2A)から分離している状態を示す。(a) shows a state in which the composite substrate is irradiated with laser light A from the temporarily fixed substrate 2 (2A) side, and (b) shows a state in which the semiconductor substrate 7 is separated from the temporarily fixed substrate 2 (2A). Indicates the state in which (a)は、仮固定基板2(2A)の固定面2aに接着剤3を設けた状態を示し、(b)は、仮固定基板2(2A)の固定面2aに電子部品4を接着した状態を示す。(a) shows the state in which the adhesive 3 is provided on the fixing surface 2a of the temporary fixing board 2 (2A), and (b) shows the state in which the electronic component 4 is adhered to the fixing surface 2a of the temporary fixing board 2 (2A). Indicates the condition. (a)は、複合基板12Aに対して仮固定基板2(2A)側からレーザー光Aを照射している状態を示し、(b)は、電子部品4および樹脂モールドを仮固定基板2(2A)から分離している状態を示す。(a) shows a state in which the composite board 12A is irradiated with laser light A from the temporarily fixed board 2 (2A) side, and (b) shows a state in which the electronic component 4 and the resin mold are irradiated with the temporarily fixed board 2 (2A). ). 仮固定基板2を示す平面図である。FIG. 2 is a plan view showing a temporarily fixed substrate 2. FIG. 仮固定基板2Aを示す平面図である。FIG. 2 is a plan view showing a temporarily fixed substrate 2A.

以下、仮固定基板上に電子部品を仮固定し、次いで剥離させるプロセスについて述べる。まず、図1(a)に示すように、仮固定基板2(2A)の固定面2a上に接着剤層3を設ける。2bはレーザー光の照射面である。 Hereinafter, a process of temporarily fixing an electronic component on a temporarily fixing substrate and then peeling it off will be described. First, as shown in FIG. 1(a), an adhesive layer 3 is provided on the fixing surface 2a of the temporary fixing substrate 2 (2A). 2b is a surface irradiated with laser light.

次いで、図1(b)に示すように、仮固定基板2(2A)上に半導体基板7を設置し、接着剤層3を硬化させて接着層3Aを形成し、複合基板12を得る。この硬化工程は、接着剤の性質に合わせて行うが、加熱、紫外線照射を例示できる。 Next, as shown in FIG. 1(b), the semiconductor substrate 7 is placed on the temporarily fixed substrate 2 (2A), and the adhesive layer 3 is cured to form the adhesive layer 3A, thereby obtaining the composite substrate 12. This curing step is carried out depending on the properties of the adhesive, and examples include heating and ultraviolet irradiation.

次いで、図2(a)に示すように、複合基板12に対して仮固定基板2(2A)の照射面2b側から矢印Aのようにレーザー光を照射し、図2(b)に示すように半導体基板7を仮固定基板2(2A)から分離する。 Next, as shown in FIG. 2(a), the composite substrate 12 is irradiated with laser light from the irradiation surface 2b side of the temporarily fixed substrate 2 (2A) in the direction of arrow A, and as shown in FIG. 2(b). Then, the semiconductor substrate 7 is separated from the temporarily fixed substrate 2 (2A).

図3、図4は他の実施形態に係るものである。
図3(a)に示すように、仮固定基板2(2A)の固定面2a上に接着剤層3を設ける。次いで、図3(b)に示すように、仮固定基板2(2A)の固定面上に多数の電子部品4を固定し、接着剤層3を硬化させて接着層3Aを形成する。次いで、図4(a)に示すように、樹脂モールド6によって電子部品4を被覆し、隣接する電子部品4間の間隙5にも樹脂モールドを浸透させる。これによって、仮固定基板2(2A)上に電子部品4および樹脂モールド6を固定し、複合基板12Aを得る。6aは、電子部品を被覆する被覆層であり、6bは、間隙5を充填する充填部である。
3 and 4 relate to other embodiments.
As shown in FIG. 3(a), an adhesive layer 3 is provided on the fixing surface 2a of the temporary fixing substrate 2 (2A). Next, as shown in FIG. 3(b), a large number of electronic components 4 are fixed on the fixing surface of the temporary fixing substrate 2 (2A), and the adhesive layer 3 is cured to form an adhesive layer 3A. Next, as shown in FIG. 4A, the electronic components 4 are covered with a resin mold 6, and the resin mold is also infiltrated into the gaps 5 between adjacent electronic components 4. Thereby, the electronic component 4 and the resin mold 6 are fixed on the temporarily fixed substrate 2 (2A), and a composite substrate 12A is obtained. 6a is a covering layer that covers the electronic component, and 6b is a filling part that fills the gap 5.

次いで、図4(a)に示すように、複合基板12Aに対して仮固定基板2(2A)の照射面2b側から矢印Aのようにレーザー光を照射し、図4(b)に示すように、樹脂モールド6および電子部品4を仮固定基板2(2A)から分離する。 Next, as shown in FIG. 4(a), the composite substrate 12A is irradiated with laser light from the irradiation surface 2b side of the temporarily fixed substrate 2 (2A) in the direction of arrow A, and as shown in FIG. 4(b). Next, the resin mold 6 and the electronic component 4 are separated from the temporarily fixed substrate 2 (2A).

ここで、本発明においては、仮固定基板が外周部と内周部とを有しており、外周部の全光線透過率が内周部の全光線透過率よりも高い。
例えば、図5に示す仮固定基板2は、固定面2aが略円形であり、リング状の外周部9、内周部10およびこれらの間のリング状の中間部11を有する。また、図6に示す仮固定基板2Aは、固定面2aが長方形状をしている。そして、仮固定基板2Aは、長方形の内周部10、仮固定基板2Aの縁部に沿って一周する外周部9およびこれらの間の中間部11を有する。
Here, in the present invention, the temporarily fixed substrate has an outer peripheral part and an inner peripheral part, and the total light transmittance of the outer peripheral part is higher than the total light transmittance of the inner peripheral part.
For example, the temporarily fixed substrate 2 shown in FIG. 5 has a substantially circular fixing surface 2a, and has a ring-shaped outer peripheral part 9, an inner peripheral part 10, and a ring-shaped intermediate part 11 between them. Further, the temporary fixing substrate 2A shown in FIG. 6 has a fixing surface 2a having a rectangular shape. The temporary fixing board 2A has a rectangular inner peripheral part 10, an outer peripheral part 9 that goes around the edge of the temporary fixing board 2A, and an intermediate part 11 between these parts.

ここで、外周部9の全光線透過率を内周部10の全光線透過率よりも高くする。これによって、図2(a)、図4(a)に示すように仮固定基板2(2A)の照射面に対してレーザー光Aを照射したときに、外周部のほうが全光線透過率が高いために、電子部品の仮固定基板からの剥離が進行し易く、内周部では剥離の進行が遅れる。この結果、仮固定基板の固定面のエッジに沿って一周する外周部9から、内周部10へと向かって矢印Bのように剥離が進行していく(図5、図6)。この結果、剥離状態が固定面の周方向に見て均等になり易く、局所的な応力集中が起こりにくく、剥離時の電子部品の破損が生じにくいことが判明した。 Here, the total light transmittance of the outer peripheral part 9 is made higher than the total light transmittance of the inner peripheral part 10. As a result, when the laser beam A is irradiated onto the irradiation surface of the temporarily fixed substrate 2 (2A) as shown in FIGS. 2(a) and 4(a), the total light transmittance is higher in the outer peripheral part. Therefore, the electronic component easily peels off from the temporarily fixed substrate, and the progress of peeling is delayed in the inner peripheral portion. As a result, peeling progresses in the direction of arrow B from the outer peripheral part 9 that goes around the edge of the fixing surface of the temporarily fixed substrate toward the inner peripheral part 10 (FIGS. 5 and 6). As a result, it was found that the peeling state tends to be uniform when viewed in the circumferential direction of the fixed surface, local stress concentration is less likely to occur, and electronic components are less likely to be damaged during peeling.

本発明においては、仮固定基板の固定面の形状は特に限定されないが、円形、楕円形のような湾曲形状であってよく、あるいは、三角形、四角形、六角形などの多角形であってよい。 In the present invention, the shape of the fixing surface of the temporary fixing substrate is not particularly limited, but may be a curved shape such as a circle or an ellipse, or a polygon such as a triangle, square, or hexagon.

外周部とは、仮固定基板の固定面の外側輪郭に沿って固定面を一周する領域を示す。また、内周部とは、固定面の中心Oを含む領域を示す。更に、仮固定基板の固定面の中心をOとしたとき、中心Oから固定面の外側輪郭の2点に下ろした垂線L(L1、L2)を想定し、この垂線L(L1、L2)の長さをX、Yとする。このとき、図5、図6に例示するように、固定面の外側輪郭から幅0.05X(Xの5%)の帯状領域を外周部とする。また、固定面の中心Oから内周部10の輪郭10aまでの距離は0.2X(Xの20%)とする。 The outer periphery refers to an area that goes around the fixing surface of the temporary fixing substrate along the outer contour of the fixing surface. In addition, the inner peripheral portion refers to a region including the center O of the fixed surface. Furthermore, when the center of the fixed surface of the temporary fixed board is O, suppose a perpendicular line L (L1, L2) drawn from the center O to two points on the outer contour of the fixed surface, and calculate the perpendicular line L (L1, L2). Let the lengths be X and Y. At this time, as illustrated in FIGS. 5 and 6, a band-shaped region having a width of 0.05X (5% of X) from the outer contour of the fixed surface is defined as the outer peripheral portion. Further, the distance from the center O of the fixed surface to the outline 10a of the inner peripheral portion 10 is 0.2X (20% of X).

例えば、図5の例では、固定面2aは円形であり、外周部9は円環形状であり、内周部10は円形である。固定面の直径をXとしたき、外周部9の幅は0.05Xとし、内周部10の幅は0.20Xとする。また、図6の例では、固定面2aは長方形であり、外周部9は帯状であり、内周部10は長方形である。ここで、中心Oから固定面の外側輪郭20まで下ろした垂線L1、L2の長さをX、Yとする。ここで、外周部9の幅は、縦方向では0.05Yであり、横方向では0.05Xである。また、内周部10の幅は、縦方向では0.40Yであり、横方向では0.40Xである。 For example, in the example shown in FIG. 5, the fixed surface 2a is circular, the outer circumference 9 is annular, and the inner circumference 10 is circular. Letting the diameter of the fixed surface be X, the width of the outer circumference 9 is 0.05X, and the width of the inner circumference 10 is 0.20X. Moreover, in the example of FIG. 6, the fixed surface 2a is rectangular, the outer peripheral part 9 is strip-shaped, and the inner peripheral part 10 is rectangular. Here, let X and Y be the lengths of perpendicular lines L1 and L2 drawn from the center O to the outer contour 20 of the fixed surface. Here, the width of the outer peripheral portion 9 is 0.05Y in the vertical direction and 0.05X in the horizontal direction. Further, the width of the inner peripheral portion 10 is 0.40Y in the vertical direction and 0.40X in the horizontal direction.

仮固定基板の全光線透過率は、仮固定基板の照射面に入射する入射光の光強度に対する、仮固定基板の固定面から出射する出射光の強度の比率である(出射光の強度/入射光の強度)。全光線透過率測定はJIS規格K7361 に基づいて行った。また、このとき、入射光の波長分布は、複合基板に対して入射させて電子部品を仮固定基板から剥離させるときの入射光の波長分布と同一のものとする。例えば、電子部品の剥離に使用するレーザー光の波長が300nmである場合には、全光線透過率を測定するときの入射光の波長も300nmとする。また、全光線透過率は、分光光度計で測定するものとする。 The total light transmittance of the temporarily fixed substrate is the ratio of the intensity of the emitted light emitted from the fixed surface of the temporarily fixed substrate to the light intensity of the incident light that enters the irradiation surface of the temporarily fixed substrate (intensity of emitted light / incident light intensity) light intensity). Total light transmittance measurement was performed based on JIS standard K7361. Further, at this time, the wavelength distribution of the incident light is the same as the wavelength distribution of the incident light when the electronic component is peeled off from the temporarily fixed substrate by being made incident on the composite substrate. For example, when the wavelength of laser light used to peel off electronic components is 300 nm, the wavelength of incident light when measuring the total light transmittance is also 300 nm. Moreover, the total light transmittance shall be measured with a spectrophotometer.

具体的には、外周部の透過率を測定するときには、固定面の中心Oから固定面の外側輪郭の2点に下ろした垂線L(L1、L2)を想定し、この垂線の長さをX(Y)としたとき、固定面の外側輪郭から中心Oに向かってX/30(Y/30)の測定箇所を12個選択する。このとき、中心Oに対して12個の測定箇所が互いに30°ずつ離れた角度で存在するようにする。そして、12個の各点についてそれぞれ全光線透過率を測定し、その平均値を外周部の透過率とすることができる。 Specifically, when measuring the transmittance of the outer periphery, a perpendicular line L (L1, L2) drawn from the center O of the fixed surface to two points on the outer contour of the fixed surface is assumed, and the length of this perpendicular line is (Y), select 12 measurement points of X/30 (Y/30) from the outer contour of the fixed surface toward the center O. At this time, 12 measurement points are arranged at angles apart from each other by 30 degrees with respect to the center O. Then, the total light transmittance can be measured for each of the 12 points, and the average value can be taken as the transmittance of the outer peripheral portion.

また、内周部の透過率を測定するときには、固定面の中心Oから固定面の外側輪郭の2点に下ろした垂線L(L1、L2)を想定し、この垂線の長さをX(Y)としたとき、固定面の外側輪郭から中心Oに向かってX/3(Y/3)の測定箇所を12個選択する。このとき、中心Oに対して12個の測定箇所が互いに30°ずつ離れた角度で存在するようにする。そして、12個の各点についてそれぞれ全光線透過率を測定し、その平均値を内周部の透過率とすることができる。 Furthermore, when measuring the transmittance of the inner circumference, assume a perpendicular line L (L1, L2) drawn from the center O of the fixed surface to two points on the outer contour of the fixed surface, and calculate the length of this perpendicular line to X(Y ), select 12 measurement points of X/3 (Y/3) from the outer contour of the fixed surface toward the center O. At this time, 12 measurement points are arranged at angles apart from each other by 30 degrees with respect to the center O. Then, the total light transmittance can be measured for each of the 12 points, and the average value can be taken as the transmittance of the inner peripheral portion.

ここで、本発明の観点からは、内周部の全光線透過率が外周部の全光線透過率よりも低いが、この差は0.1%以上であることが好ましく、0.3%以上であることが更に好ましく、0.5%以上であることが特に好ましい。一方、内周部の全光線透過率と外周部の全光線透過率との差が大きくなると、剥離の程度に差ができてしまい、内周部が全くはがれないことが発生する。
こうした観点からは、内周部の全光線透過率と外周部の全光線透過率との差は、5.0%以下が好ましく、3.0%以下が更に好ましく、1.0%以下が特に好ましい。
Here, from the viewpoint of the present invention, the total light transmittance of the inner circumference is lower than the total light transmittance of the outer circumference, but this difference is preferably 0.1% or more, and 0.3% or more. It is more preferable that it is, and it is especially preferable that it is 0.5% or more. On the other hand, if the difference between the total light transmittance of the inner peripheral part and the total light transmittance of the outer peripheral part becomes large, there will be a difference in the degree of peeling, and the inner peripheral part will not be peeled off at all.
From this point of view, the difference between the total light transmittance of the inner peripheral part and the total light transmittance of the outer peripheral part is preferably 5.0% or less, more preferably 3.0% or less, and particularly 1.0% or less. preferable.

本発明では、内周部の全光線透過率を60.0%以上とする。これが低いと、剥離時に内周部で割れが生じ易くなる。こうした観点からは、内周部の全光線透過率を60.0%以上とするが、65.0%以上が好ましく、70.0%以上が更に好ましい。また、外周部の全光線透過率は60.0%を超えているが、65.0%以上が好ましく、70.0%以上が更に好ましい。内周部の光線透過率、外周部の光線透過率は、95.0%以下が好ましく、90.0%以下が更に好ましい。 In the present invention, the total light transmittance of the inner peripheral portion is set to 60.0% or more. If this is low, cracks are likely to occur at the inner peripheral portion during peeling. From this viewpoint, the total light transmittance of the inner peripheral portion is set to 60.0% or more, preferably 65.0% or more, and more preferably 70.0% or more. Further, the total light transmittance of the outer peripheral portion exceeds 60.0%, preferably 65.0% or more, and more preferably 70.0% or more. The light transmittance of the inner peripheral part and the light transmittance of the outer peripheral part are preferably 95.0% or less, more preferably 90.0% or less.

仮固定基板2の厚みは、0.3~3.0mmとすることが好ましい。仮固定基板2の厚みを0.3mm以上とすることによって、仮固定に好適な機械的強度を確保しやすい。また、仮固定基板2の厚みを3.0mm以下とすることによって、好適な全光線透過率を得易くなる。 The thickness of the temporarily fixed substrate 2 is preferably 0.3 to 3.0 mm. By setting the thickness of the temporary fixing substrate 2 to 0.3 mm or more, it is easy to ensure mechanical strength suitable for temporary fixing. Further, by setting the thickness of the temporarily fixed substrate 2 to 3.0 mm or less, it becomes easier to obtain a suitable total light transmittance.

仮固定基板の材質は時に限定されないが、レーザー光照射に対する耐久性を有することが好ましい。好適な実施形態においては、仮固定基板が、アルミナ、窒化珪素、窒化アルミニウムまたは酸化珪素からなる。これらは緻密性を高くしやすく、薬品に対する耐久性が高い。 Although the material of the temporarily fixed substrate is not limited, it is preferable that the material has durability against laser beam irradiation. In a preferred embodiment, the temporarily fixed substrate is made of alumina, silicon nitride, aluminum nitride, or silicon oxide. These materials are easy to make dense and have high durability against chemicals.

好適な実施形態においては、仮固定基板を構成する材料が透光性アルミナである。この場合、好ましくは純度99.9%以上(好ましくは99.95%以上)の高純度アルミナ粉末に対して、100ppm以上、300ppm以下の酸化マグネシウム粉末を添加する。このような高純度アルミナ粉末としては、大明化学工業株式会社製の高純度アルミナ粉体を例示できる。また、この酸化マグネシウム粉末の純度は99.9%以上が好ましく、平均粒径は50μm以下が好ましい。 In a preferred embodiment, the material constituting the temporarily fixed substrate is translucent alumina. In this case, preferably 100 ppm or more and 300 ppm or less of magnesium oxide powder is added to high purity alumina powder with a purity of 99.9% or more (preferably 99.95% or more). An example of such high purity alumina powder is high purity alumina powder manufactured by Daimei Kagaku Kogyo Co., Ltd. Further, the purity of this magnesium oxide powder is preferably 99.9% or more, and the average particle size is preferably 50 μm or less.

また、好適な実施形態においては、焼結助剤として、アルミナ粉末に対して、ジルコニア(ZrO)を200~800ppm、イットリア(Y)を10~30ppm添加することが好ましい。 In a preferred embodiment, 200 to 800 ppm of zirconia (ZrO 2 ) and 10 to 30 ppm of yttria (Y 2 O 3 ) are preferably added to the alumina powder as sintering aids.

仮固定基板の成形方法は特に限定されず、ドクターブレード法、押し出し法、モールドキャスト法など任意の方法であってよい。特に好ましくは、ベース基板をモールドキャスト法を用いて製造する。 The method for forming the temporarily fixed substrate is not particularly limited, and may be any method such as a doctor blade method, an extrusion method, or a mold casting method. Particularly preferably, the base substrate is manufactured using a mold casting method.

好適な実施形態においては、セラミック粉末、分散媒および硬化剤を含むスラリーを製造し、このスラリーを注型し、固化させることによって成形体を得る。ここで、成形の段階では、型に離型剤を塗布し、型を組み、スラリーを注型する。次いで、スラリーを型内で硬化させて成形体を得、成形体を離型する。次いで型を洗浄する。 In a preferred embodiment, a molded body is obtained by producing a slurry containing ceramic powder, a dispersion medium, and a hardening agent, casting the slurry, and solidifying the slurry. Here, in the molding stage, a mold release agent is applied to the mold, the mold is assembled, and the slurry is poured into the mold. Next, the slurry is cured in the mold to obtain a molded body, and the molded body is released from the mold. The mold is then cleaned.

次いで、成形体を乾燥し、好ましくは大気中で仮焼し、次いで、水素中で本焼成する。本焼成時の焼結温度は、焼結体の緻密化という観点から、1700~1900℃が好ましく、1750~1850℃が更に好ましい。 Next, the molded body is dried, preferably calcined in the atmosphere, and then main calcined in hydrogen. The sintering temperature during the main firing is preferably 1700 to 1900°C, more preferably 1750 to 1850°C, from the viewpoint of densification of the sintered body.

また、焼成時に十分に緻密な焼結体を生成させた後に、更に追加でアニール処理を実施することで反り修正を行うことができる。このアニール温度は、1200℃~1900℃が好ましい。また、アニール時間は、1~6時間であることが好ましい。 Further, after a sufficiently dense sintered body is generated during firing, warpage can be corrected by additionally performing an annealing treatment. This annealing temperature is preferably 1200°C to 1900°C. Further, the annealing time is preferably 1 to 6 hours.

ここで、仮固定基板の内周部の全光線透過率を外周部の全光線透過率よりも低くするためには、外周部の焼成温度を内周部の焼成温度よりも高くすることで、焼成を促進し、気孔率を低減することができる。この温度差は5~200℃が好ましく、10~100℃が更に好ましい。また、外周部の焼結温度を内周部の焼結温度よりも高くすることで、外周部のアニールを促進することができる。 Here, in order to make the total light transmittance of the inner peripheral part of the temporarily fixed substrate lower than the total light transmittance of the outer peripheral part, the firing temperature of the outer peripheral part is made higher than the firing temperature of the inner peripheral part. It can accelerate firing and reduce porosity. This temperature difference is preferably 5 to 200°C, more preferably 10 to 100°C. Further, by setting the sintering temperature of the outer circumferential portion higher than the sintering temperature of the inner circumferential portion, annealing of the outer circumferential portion can be promoted.

接着剤としては、両面テープやホットメルト系の接着剤などを例示できる。また、接着剤層を仮固定基板上に設ける方法としては、ロール塗布、スプレー塗布、スクリーン印刷、スピンコートなど種々の方法を採用できる。 Examples of the adhesive include double-sided tape and hot melt adhesive. In addition, various methods such as roll coating, spray coating, screen printing, and spin coating can be employed as a method for providing the adhesive layer on the temporary fixing substrate.

半導体基板としては、JEITAもしくはSEMI規格に則ったシリコン基板が好ましい。 As the semiconductor substrate, a silicon substrate conforming to JEITA or SEMI standards is preferable.

また、電子部品を充填するモールド樹脂としては、エポキシ系樹脂、ポリイミド系樹脂、ポリウレタン系樹脂、ウレタン系樹脂などが挙げられる。 Furthermore, examples of the mold resin used to fill the electronic component include epoxy resin, polyimide resin, polyurethane resin, and urethane resin.

以下の成分を混合したスラリーを調製した。
(原料粉末)
・純度99.99%のα-アルミナ粉末 100重量部
・MgO(マグネシア) 250ppm
・ZrO(ジルコニア) 400ppm
・Y(イットリア) 15ppm
(分散媒)
・2-エチルヘキサノール 45重量部
(結合剤)
・PVB樹脂 4重量部
(分散剤)
・高分子界面活性剤 3重量部
(可塑剤)
・DOP 0.1重量部
A slurry was prepared by mixing the following ingredients.
(Raw material powder)
・α-alumina powder with a purity of 99.99% 100 parts by weight ・MgO (magnesia) 250 ppm
・ZrO 2 (zirconia) 400ppm
Y2O3 ( yttria) 15ppm
(Dispersion medium)
・2-Ethylhexanol 45 parts by weight (binder)
PVB resin 4 parts by weight (dispersant)
Polymer surfactant 3 parts by weight (plasticizer)
・DOP 0.1 part by weight

このスラリーを、ドクターブレード法を用いて焼成後の厚さに換算して0.9mmとなるようテープ状に成形し、焼成後の大きさに換算してφ300mmとなるよう切断した。得られた粉末成形体を、大気中1240℃で仮焼(予備焼成)の後、基板をモリブデン製の板に載せ、水素3:窒素1の雰囲気中で、1800℃で2.5時間保持し、焼成を行った。その後、グラインダーによる研削、ダイヤモンド砥粒によるラップ、CMPリキッドによる研磨を順に行い、0.8mm厚の仮固定基板2を得た。 This slurry was formed into a tape shape using a doctor blade method so that the thickness after firing was 0.9 mm, and the tape was cut to have a diameter of 300 mm after firing. After calcination (preliminary firing) of the obtained powder compact at 1240°C in the air, the substrate was placed on a molybdenum plate and held at 1800°C for 2.5 hours in an atmosphere of 3 parts hydrogen and 1 part nitrogen. , firing was performed. Thereafter, grinding with a grinder, lapping with diamond abrasive grains, and polishing with CMP liquid were performed in this order to obtain a temporarily fixed substrate 2 with a thickness of 0.8 mm.

仮固定基板2の内周部10と外周部9の全光線透過率とは、焼成の際に各焼成温度に温度勾配をつけることで、内外差の気孔率を調整して行った。 The total light transmittance of the inner peripheral part 10 and the outer peripheral part 9 of the temporarily fixed substrate 2 was determined by adjusting the porosity difference between the inside and outside by adding a temperature gradient to each firing temperature during firing.

透過率の評価は分光光度計を用いて行った。
具体的には、固定面の外側輪郭20から中心Oへと径方向に向かう直線(垂線)L上で外側輪郭から10mm(300mm/30)の場所に測定箇所を12個設けた。12個の測定箇所は、30°の角度刻みに配置した。そして、12個の測定値の平均値を外周部9の全光線透過率とした。また、固定面2の外側輪郭20から中心Oへと径方向に向かう直線上で外側輪郭から100mmm(300mm/3)の場所に測定箇所を12個設けた。12個の測定箇所は、30°の角度刻みに配置した。そして、12個の測定値の平均値を内周部の全光線透過率とした。
Transmittance evaluation was performed using a spectrophotometer.
Specifically, 12 measurement points were provided at locations 10 mm (300 mm/30) from the outer contour on a straight line (perpendicular) L extending radially from the outer contour 20 of the fixed surface to the center O. The 12 measurement points were arranged at angular increments of 30°. Then, the average value of the 12 measured values was taken as the total light transmittance of the outer peripheral portion 9. In addition, 12 measurement points were provided at locations 100 mm (300 mm/3) from the outer contour on a straight line extending in the radial direction from the outer contour 20 of the fixed surface 2 to the center O. The 12 measurement points were arranged at angular increments of 30°. Then, the average value of the 12 measured values was taken as the total light transmittance of the inner peripheral portion.

次いでスピンコートで、仮固定基板上に剥離層(3M社製:Light-to-Heat Conversion)を形成する。また、スピンコートで、シリコンウェハー(厚さ0.775mm)の表面に接着剤(3M社製:LC-5320 F1035)を塗布し、仮固定基板とシリコンウェハーを貼り合わせ、複合基板を得た。 Next, a release layer (manufactured by 3M: Light-to-Heat Conversion) is formed on the temporarily fixed substrate by spin coating. Further, an adhesive (LC-5320 F1035, manufactured by 3M) was applied to the surface of a silicon wafer (thickness: 0.775 mm) by spin coating, and the temporarily fixed substrate and silicon wafer were bonded together to obtain a composite substrate.

その後、仮固定基板2の照射面2b側からレーザー光Aを照射し、仮固定基板とシリコンウェハーとの剥離を行った。同じ実験を20回繰り返し行い、シリコンウェハーが割れた場合、あるいは、シリコンウェハーと支持基板が剥がれなかった場合を「不良」としてカウントした。これらの結果を表1、2、3に示す。 Thereafter, laser light A was irradiated from the irradiation surface 2b side of the temporarily fixed substrate 2 to separate the temporarily fixed substrate and the silicon wafer. The same experiment was repeated 20 times, and cases where the silicon wafer cracked or cases where the silicon wafer and support substrate did not separate were counted as "defective." These results are shown in Tables 1, 2, and 3.

Figure 0007430704000001
Figure 0007430704000001

Figure 0007430704000002
Figure 0007430704000002

Figure 0007430704000003
Figure 0007430704000003

表1、表2からわかるように、仮固定基板の外周部および内周部が本発明を満足している場合には、シリコンウェハーや仮固定基板の割れ、剥離不良が抑制されていた。 As can be seen from Tables 1 and 2, when the outer peripheral portion and inner peripheral portion of the temporary fixed substrate satisfied the present invention, cracking and peeling defects of the silicon wafer and the temporary fixed substrate were suppressed.

表3の比較例1、2、3から判るように、仮固定基板の内周部の全光線透過率が外周部の全光線透過率以上である場合には、シリコンウェハーの剥離時に割れや剥離不良が発生することがあった。
比較例4では、内周部の全光線透過率が外周部の全光線透過率よりも低いが、しかし内周部の全光線透過率が60%未満であるために、剥離不良が生じた。

As can be seen from Comparative Examples 1, 2, and 3 in Table 3, if the total light transmittance of the inner circumference of the temporarily fixed substrate is greater than the total light transmittance of the outer circumference, cracks or peeling may occur when the silicon wafer is peeled off. Defects sometimes occurred.
In Comparative Example 4, the total light transmittance of the inner peripheral part was lower than that of the outer peripheral part, but since the total light transmittance of the inner peripheral part was less than 60%, defective peeling occurred.

Claims (7)

電子部品を接着し、仮固定するための固定面と、前記固定面の反対側にある照射面とを備える仮固定基板であって、
前記仮固定基板が外周部と内周部とを有しており、前記内周部の全光線透過率が前記外周部の全光線透過率よりも低く、かつ60%以上であることを特徴とする、仮固定基板。
A temporary fixing board comprising a fixing surface for adhering and temporarily fixing electronic components, and an irradiation surface on the opposite side of the fixing surface,
The temporary fixing substrate has an outer peripheral part and an inner peripheral part, and the total light transmittance of the inner peripheral part is lower than the total light transmittance of the outer peripheral part, and is 60% or more. Temporarily fixed board.
前記仮固定基板がガラス、シリコンまたはセラミックスからなることを特徴とする請求項1記載の仮固定基板。 The temporary fixing substrate according to claim 1, wherein the temporary fixing substrate is made of glass, silicon, or ceramics. 前記仮固定基板が透光性アルミナからなることを特徴とする、請求項2記載の仮固定基板。 3. The temporary fixing substrate according to claim 2, wherein the temporary fixing substrate is made of translucent alumina. 請求項1~3のいずれか一つの請求項に記載の仮固定基板、および前記仮固定基板の前記固定面に接着された電子部品を備えていることを特徴とする、複合基板。 A composite board comprising the temporarily fixed board according to any one of claims 1 to 3, and an electronic component adhered to the fixed surface of the temporarily fixed board. 前記固定面に対して接着された半導体基板を備えており、この半導体基板に前記電子部品が形成されていることを特徴とする、請求項4記載の複合基板。 5. The composite board according to claim 4, further comprising a semiconductor substrate bonded to said fixed surface, and said electronic component is formed on said semiconductor substrate. 前記固定面に対して接着された樹脂モールドを備えており、この樹脂モールド内に前記電子部品が固定されていることを特徴とする、請求項4記載の複合基板。 5. The composite board according to claim 4, further comprising a resin mold adhered to said fixing surface, and said electronic component being fixed within said resin mold. 前記複合基板に対して前記仮固定基板の前記照射面側からレーザー光を照射することによって、前記電子部品から前記仮固定基板を剥離させることを特徴とする、請求項4~6のいずれか一つの請求項に記載の電子部品の剥離方法。

Any one of claims 4 to 6, characterized in that the temporary fixing substrate is peeled from the electronic component by irradiating the composite substrate with a laser beam from the irradiation surface side of the temporary fixing substrate. A method for peeling off an electronic component according to claim 1.

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