WO2014199726A1 - シート接着剤、および、それを用いた半導体装置の製造方法、および、それを用いた熱式空気流量センサの製造方法、および、熱式空気流量センサ - Google Patents
シート接着剤、および、それを用いた半導体装置の製造方法、および、それを用いた熱式空気流量センサの製造方法、および、熱式空気流量センサ Download PDFInfo
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- WO2014199726A1 WO2014199726A1 PCT/JP2014/061002 JP2014061002W WO2014199726A1 WO 2014199726 A1 WO2014199726 A1 WO 2014199726A1 JP 2014061002 W JP2014061002 W JP 2014061002W WO 2014199726 A1 WO2014199726 A1 WO 2014199726A1
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- sheet adhesive
- manufacturing
- semiconductor device
- semiconductor
- semiconductor element
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
- H01L2924/1815—Shape
Definitions
- the present invention relates to a method for manufacturing a semiconductor device, and more particularly to a method for manufacturing a thermal air flow sensor suitable for detecting an intake air amount of an engine installed in an intake system of an automobile engine, and a thermal flow sensor. And a sheet adhesive used for them.
- thermal sensor that is provided in an intake air passage of an internal combustion engine such as an automobile and measures the amount of intake air has become mainstream because it can directly detect the amount of mass air.
- a general method of using a sheet adhesive is to attach a sheet adhesive to the back side in the state of a semiconductor circuit wafer, and cut the sheet adhesive layer at the same time when separating into individual pieces in a dicing process, thereby making a semiconductor circuit chip.
- the sheet adhesive is stuck to the entire back surface.
- sheet adhesives are used in various applications, but when used for semiconductor elements, they are mainly used for integrated circuit chips that are not subjected to back surface processing, such as IC chips.
- the technique described in Patent Document 1 does not consider problems peculiar to bonding a physical quantity sensor having a diaphragm portion formed on a semiconductor element. The specific problems will be described below.
- an object of the present invention is to provide a thermal air flow meter with improved measurement accuracy, a manufacturing method thereof, and a sheet adhesive used therefor.
- the sheet adhesive of the present invention is, for example, a sheet adhesive that is divided into at least two pieces with respect to one adherend and has a thickness of about 0.1 mm or less.
- the sheet adhesive is divided corresponding to the shape of the adherend, and the adhesiveness or tackiness is generated or increased by energy from the outside.
- thermo air flow meter with improved measurement accuracy, a manufacturing method thereof, and a sheet adhesive used therefor.
- FIG. 1 shows a sheet adhesive cutting and dividing method.
- FIG. 1A shows a state in which the dicing tape 101 with the sheet adhesive before the sheet adhesive 102 is divided is attached to the dicing ring 100.
- the portion corresponding to the application surface of the dicing ring 100 and the dicing tape 101 with the sheet adhesive may be attached to the sheet adhesive 102 side as shown in FIG. 1B, or as shown in FIG. Alternatively, it may be attached to the dicing tape 103 side.
- FIG. 1 (d) shows a state in which cutting and dividing into the sheet adhesive 102 is performed by the dicing apparatus in the state of FIG. 1 (a).
- dicing is performed at a pitch of P1 and P3, and then dicing is performed at a pitch of P2 and P4, whereby sheet adhesive 102 is left uncut on dicing tape 103, and dimension Dx , Dy can be divided into equal pitches.
- the dicing order at this time may be divided in an arbitrary cut order.
- FIG. 2 shows a semiconductor device 122 formed with a thin film according to the first embodiment of the present invention.
- FIG. 2A is a plan view of the semiconductor element 122
- FIG. 2B is a cross-sectional view of the semiconductor element 122.
- the flow rate detecting element has a laminated structure film of an insulating film layer formed on a semiconductor substrate 122 such as silicon, and the rear surface side of the semiconductor substrate 122 is partially covered with potassium hydroxide or the like.
- the diaphragm 123 is formed by removing.
- the dicing tape 103 with sheet adhesive is bonded and adhered to the semiconductor element wafer 200 so that the region surrounded by the uncut dimensions Dx and Dy in FIG. 1D falls within the opening region shown in FIG. .
- the dimensions Dx and Dy shown in FIG. 1D are set so that Dx ⁇ opening dimension x and Dy ⁇ opening dimension y.
- the divided sheet adhesive (s) 201 is not bonded immediately below the diaphragm 123 because there is no contact with the semiconductor element wafer. That is, in other words, a notch by dicing is formed in the region of the cavity on the back surface side of the diaphragm 123.
- FIG. 4 shows an outline of the cutting and dividing of the sheet adhesive 102.
- the sheet adhesive 102 is a mixture of a paste material that is softened by heat and generates tackiness, an initiator that hardens the base material by heat, ultraviolet light, light, or electromagnetic waves, and a filler, and is bonded to an adherend. It heats in a state, and adhesively cures while increasing the number of contacts with the adherend by simultaneously applying pressure and ultrasonic waves.
- the glue material is diced without stickiness, thereby reducing excavation resistance at the time of processing and preventing foreign matter from adhering.
- the base material is cured with ultraviolet rays, light, or electromagnetic waves by selecting an initiator.
- the filler enhances the function of the sheet adhesive 102 by increasing the strength after curing by mixing fine silica particles and imparting conductivity by mixing fine metal particles.
- the semiconductor element 122 When the sheet adhesive 102 is attached, for example, when air bubbles are trapped between the semiconductor element 122 incorporated in the semiconductor device and the adhesive sheet 102, the semiconductor element 122 may be inclined due to the air bubbles, and the performance may be deteriorated. There is. Further, since the bubbles expand and contract due to a temperature change, there is a possibility that the fatigue of the connection portion is caused and the durability of the semiconductor device is lowered.
- a notch by dicing is formed in the area of the cavity on the back side of the diaphragm 123, and as shown in FIG. 8, the notch by dicing into the sheet adhesive 102 serves as a ventilation path. It is difficult for air bubbles to be caught in the gas, and gas generated from the sheet adhesive at the time of bonding is easily released.
- the semiconductor element wafer 200 is separated into pieces by dicing.
- the sheet adhesive 102 has a higher excavation resistance during dicing than silicon, and easily causes clogging of the dicing blade. For this reason, the thickness of the sheet adhesive 102 is approximately 0.1 mm or less to prevent burrs on the back surface of the semiconductor element wafer 200 and the sheet adhesive 102 during dicing.
- the sheet adhesive (s) 201 divided as shown in FIG. 7 is left on the dicing tape. Therefore, as shown in FIG. 8, the divided sheet adhesive 102 is adhered to the back surface of the picked-up semiconductor element 122, and there is no sheet adhesive 102 immediately below the thin film portion on the semiconductor element 122. Is formed.
- processing does not require expensive equipment like a laser processing machine, and can be shared with dicing equipment used for chip separation, so that dedicated equipment can be dispensed with.
- vents can be provided at an accurate pitch. Further, the influence on the processing accuracy due to the thickness variation of the sheet adhesive 102 is very small, and deformation or protrusion of the hole peripheral portion due to the variation in thickness does not occur. In addition, cutting waste generated by processing can be easily removed by cleaning.
- FIG. 9 shows a semiconductor element mounting structure which is an embodiment of a thermal flow sensor.
- 9A is a cross-sectional view when viewed from the side
- FIG. 9B is a surface view when viewed from directly above.
- the flow rate detection element 15 has a laminated structure film 26 of an insulating film layer and a resistor layer formed on a semiconductor substrate 20 such as silicon, and a semiconductor using potassium hydroxide (KOH) or the like.
- the diaphragm 25 is formed by partially removing the back surface side of the substrate 20.
- the heating resistor 21, the upstream temperature measuring resistor 22, and the downstream temperature measuring resistor 23 are formed.
- An electrode pad 40 is formed on the surface of the semiconductor substrate 20 and is electrically connected to the outside of the semiconductor substrate 20 via a wire bonding 50 such as a gold wire.
- the flow rate detecting element 15 is fixed on the lead frame 10 with a sheet adhesive 102.
- the lead frame 10 is provided with a ventilation hole 11 for the purpose of ventilating the back surface of the diaphragm. Further, the sheet adhesive 102 was formed in a part of the region where the diaphragm back surface opening end 24 and the ventilation hole 11 formed in the lead frame 10 coincided with each other (hence corresponding to the region 11 in FIG. 9). A ventilation hole 35 is formed.
- the back surface of the diaphragm can communicate with the outside air through the two ventilation holes (11, 35).
- FIG. 9 a mold structure in which the structure of FIG. 9 is sealed with a resin by transfer molding will be described with reference to FIG.
- the outer peripheral portion of the structure of FIG. 9 is sealed with the mold resin 60, but an opening 61 is formed on the surface side of the diaphragm 25 in order to partially expose the diaphragm 25 from the mold resin 60.
- An opening 62 for ventilation is formed on the back side of the ventilation hole 11 formed in the lead frame 10.
- transfer mold package In the transfer mold package in which the flow rate detecting element 15 is molded with the mold resin 60, the diaphragm 25 for detecting the air flow rate is partially exposed from the mold resin 60 and is not exposed to the measurement medium when detecting the flow rate. Don't be.
- the lead frame 10 on which the flow rate detecting element 15 is mounted is sandwiched between the lower mold 80 and the upper mold 81. At this time, an insertion port 82 through which a mold resin is poured is provided regardless of the lower mold 80 and the upper mold 81.
- a structure is adopted in which a slot 83, which is a mold different from the upper mold 81, is inserted into the upper mold 81, and the slot 83 is loaded from above. Is applied to the surface of the flow rate detecting element 15. Further, the lower mold 80 is formed with a protrusion so that the mold resin 60 does not flow into the ventilation hole 11 formed in the lead frame 10, and this protrusion and the lead frame 10 are connected to the region including the ventilation hole 11. It is in close contact. If resin is poured from the insertion port 82 in this state, the semiconductor package of the mold structure shown in FIG. 10 can be manufactured.
- FIG. 12 shows a semiconductor element mounting structure before the thermal flow sensor is molded.
- FIG. 12A shows a cross-sectional view when viewed from the side
- FIG. 12B shows a surface view when viewed from directly above.
- the difference from the first embodiment is that a support substrate 70 of another component is interposed between the semiconductor substrate 20 and the lead frame 10.
- no ventilation hole is formed in the lead frame 10.
- a ventilation hole 71 is formed in a hollow region formed on the back surface side of the diaphragm 25 through another support substrate 70, and another ventilation hole 72 for ventilating the semiconductor substrate 20 side is provided.
- the groove 73 has a structure formed in a separate support substrate 70, but the same effect can be obtained when formed in the lead frame 10.
- the diaphragm region 25 is formed in the sheet adhesive 102 by forming the ventilation hole 35 in which the region of the diaphragm 25 and the region of the ventilation hole 71 formed in the support substrate 70 coincide with each other. All the other ventilation holes 72 that ventilate the semiconductor substrate side can communicate with each other.
- FIG. 10 A mold structure in which the structure of FIG. 12 is sealed with a resin by transfer molding will be described with reference to FIG.
- the difference from FIG. 10 is that the ventilation hole 72 formed in the support substrate 70 is not covered with the transfer mold resin. As a result, the outside can be ventilated through the ventilation hole 72.
- FIG. 14 is a view in which a thermal air flow sensor mounted with the transfer mold package shown in FIG. 13 is attached to the intake duct 5. As shown in FIG. 14, one end of the connector terminal 8 extends into the circuit chamber 16 and is electrically connected to the semiconductor package 2 in the circuit chamber 16, and the other end extends to the fitting portion of the connector portion 12. Electrically connected to external terminals.
- the housing 3 includes a communication hole 9 that communicates with a fitting portion between the circuit chamber 16 and the connector portion 12.
- the communication hole 9 communicates the circuit chamber 16 with the outside of the intake pipe and prevents the circuit chamber 16 from being sealed.
- the ventilation hole 72 formed in the support substrate 70 is ventilated in a space 16 (circuit room) different from the bypass passage 6 for introducing the intake air.
- the bypass passage 6 and the circuit chamber 16 are isolated so as not to communicate with each other. Further, since the circuit chamber 16 communicates with the outside air through a ventilation hole 9 formed in the housing 3, sealing of the rear surface of the diaphragm can be avoided. Further, since the bypass passage 6 and the circuit chamber 16 are isolated, the ventilation hole 72 formed in the support substrate 70 is not blocked by the contaminated material such as oil or carbon flowing through the bypass passage 6, thereby improving the reliability. .
- Ventilation hole 73 formed in the substrate support member ... ventilation hole (71, 72) Groove 10 communicating ... sheet adhesive 103 ... dicing tape 122 ... semiconductor element (semiconductor substrate) 123 ... Thin film (diaphragm) 124 ... Opening area 200 ... Semiconductor element wafer 201 ... Divided sheet adhesive (s) 202 ... Incision E by dicing 203 ... Cutting F by dicing 210: Divided semiconductor element 220: Pickup nozzle
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Abstract
Description
流量検出素子15をモールド樹脂60でモールド成形したトランスファーモールドパッケージは、流量を検出する上で、空気流量を検出するダイアフラム25がモールド樹脂60から部分的に露出し、測定媒体に曝されていなければならない。これを実現する方法として、流量検出素子15を実装したリードフレーム10を下金型80と上金型81で挟み込む。この時、下金型80、上金型81を問わずにモールド樹脂を流し込む挿入口82が設けられている。さらに、ダイアフラム25を部分的に露出させるために、上金型81とは別の金型である入れ駒83を上金型81に挿入するような構造としており、この入れ駒83を上部から荷重をかけて流量検出素子15の表面と密着させる。また、下金型80にはリードフレーム10に形成された換気孔11にモールド樹脂60が流れ込まないように突起部が形成され、この突起部とリードフレーム10とを、換気孔11を含む領域とで密着させている。この状態で挿入口82から樹脂を流し込めば、図10に示したモールド構造体の半導体パッケージを製造することができる。
11・・・リードフレームに形成される換気孔
15・・・流量検出素子
20・・・半導体基板
21・・・発熱抵抗体
22・・・上流側温抵抗体
23・・・下流側温抵抗体
24・・・ダイアフラム裏面開口端部
25・・・ダイアフラム
26・・・絶縁膜層および抵抗体層の積層構造膜
27・・・半導体素子裏面外周部
28・・・ダイアフラム裏面開口端から半導体素子裏面外周部との最小寸法
30・・・シート接着剤
35・・・シート接着剤に形成される換気孔
60・・・モールド樹脂
61・・・表面側に形成されたモールド開口部
62・・・裏面側に形成されたモールド開口部
70・・・基板支持部材
71・・・基板支持部材に形成される換気孔
72・・・基板支持部材に形成される換気孔
73・・・換気孔(71、72)を連通する溝
102・・・シート接着剤
103・・・ダイシングテープ
122・・・半導体素子(半導体基板)
123・・・薄膜(ダイアフラム)
124・・・開口領域
200・・・半導体素子ウェハ
201・・・分割されたシート接着剤(s)
202・・・ダイシングによる切り込みE
203・・・ダイシングによる切り込みF
210・・・個片化された半導体素子
220・・・ピックアップノズル
Claims (13)
- 被着体1つに対して少なくとも2つ以上に分割されており、厚みは概ね0.1mm以下であるシート接着剤であって、
被着体の形状に対応してシート接着剤が分割されており、
外部からのエネルギーにより接着性または粘着性を発生または増加させることを特徴とするシート接着剤。 - ダイシングテープ上にパターン形状として配置されていることを特徴とする請求項1に記載のシート接着剤。
- 単一材あるいは複合材を含む樹脂材であり、フィラーなどを混入した混合物で構成されたことを特徴とする請求項1に記載のシート接着剤。
- 熱、紫外線、光、電磁波、圧力、超音波などの外部からのエネルギーにより接着・硬化することを特徴とする請求項1に記載のシート接着剤。
- 半導体素子の配置間隔と対応するようにパターン形成した請求項1乃至4のいずれかに記載のシート接着剤と、前記半導体素子を一定間隔で繰返し配置した半導体素子ウェハと、を貼付けたことを特徴とする半導体装置。
- 請求項5に記載の半導体装置であって、
前記シート接着剤は、前記半導体素子と接着する面とは反対側の面に支持基板が接着され、
前記半導体素子と前記支持基板とを前記シート接着剤を介して接着したことを特徴とする半導体装置 - 半導体基板を加工して設けられるダイアフラムを有する半導体素子ウェハとシート接着剤が貼り付けられたダイシングテープとを前記半導体素子ウェハの加工に使用されるダイシング装置を用いて、前記半導体素子ウェハを個片化する工程を少なくとも含む半導体装置の製造方法であって、
前記シート接着剤が貼り付けられたダイシングテープ上のシート接着剤を前記半導体素子ウェハに貼り付ける前に前記ダイシング設備による切り込みを利用して分割する工程と、
前記個片化された半導体素子をピックアップするピックアップ工程と、を有し、
さらに、前記ピックアップ工程を経た後に前記シート接着剤に通気口を形成する工程を有することを特徴とする半導体装置の製造方法。 - 請求項7に記載の半導体装置の製造方法において、
前記シート接着剤は、少なくとも3辺以上を持つ多角形形状の通気口が設けられることを特徴とする半導体装置の製造方法。 - 請求項7に記載の半導体装置の製造方法において、
前記シート接着剤に形成された通気口の最大寸法は、半導体素子の裏面におけるダイアフラム裏面開口寸法よりも小さいことを特徴とする半導体装置の製造方法。 - 請求項8に記載の半導体装置の製造方法において、
前記シート接着剤は、形成された前記多角形形状の通気口の各辺の延長線上に、切込みが設けられていることを特徴とする半導体装置の製造方法。 - 半導体基板を加工して設けられるダイアフラムを有し前記ダイアフラム上に発熱抵抗体および前記発熱抵抗体に対して空気流れの上流側、下流側にそれぞれ設けられる側温抵抗体を備えた複数の流量検出素子からなる半導体素子ウェハと、シート接着剤が貼り付けられたダイシングテープと、を前記半導体素子ウェハの加工に使用されるダイシング装置を用いて前記半導体素子ウェハをそれぞれ流量検出素子に個片化する工程を少なくとも含む半導体装置の製造方法であって、
前記シート接着剤が貼り付けられたダイシングテープ上のシート接着剤を前記半導体素子ウェハに貼り付ける前に前記ダイシング設備による切り込みを利用して分割する工程と、
前記個片化された流量検出素子をピックアップするピックアップ工程と、
前記ピックアップされた流量検出素子を、連通孔を備えた支持部材に搭載する工程と、を有することを特徴とする熱式空気流量センサの製造方法。 - 請求項11に記載の熱式空気流量センサの製造方法において、
前記支持部材は、リードフレームからなることを特徴とする熱式空気流量センサの製造方法。 - 請求項11または請求項12のいずれかに記載の熱式空気流量センサの製造方法で造られた熱式空気流量センサにおいて、
前記支持部材の連通孔は、前記ダイアフラムの裏面側に設けられる空洞部の一方を開口するように設けられており、
前記シート接着剤は、前記ダイアフラムの裏面の空洞部の領域と前記支持部材の連通孔の開口領域とを連通するように形成された通気口を有し、
前記ダイアフラムの裏面の空洞部領域に前記シート接着剤の切り込みが形成されることを特徴とする熱式空気流量センサ。
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EP14810749.3A EP3009486B1 (en) | 2013-06-13 | 2014-04-18 | Method for manufacturing a semiconductor device, method for manufacturing a thermal type airflow sensor, and thermal type airflow sensor |
JP2015522625A JP6062545B2 (ja) | 2013-06-13 | 2014-04-18 | 半導体装置とその製造方法、および、熱式空気流量センサとその製造方法 |
CN201480033607.8A CN105308138B (zh) | 2013-06-13 | 2014-04-18 | 粘合片、使用该粘合片的半导体装置的制造方法、使用该粘合片的热式空气流量传感器的制造方法、以及热式空气流量传感器 |
US14/896,084 US9779976B2 (en) | 2013-06-13 | 2014-04-18 | Adhesive sheet, method for manufacturing semiconductor device using same, method for manufacturing thermal airflow sensor using same, and thermal airflow sensor |
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Publication number | Publication date |
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EP3009486B1 (en) | 2018-01-31 |
JPWO2014199726A1 (ja) | 2017-02-23 |
CN105308138A (zh) | 2016-02-03 |
US9779976B2 (en) | 2017-10-03 |
JP6062545B2 (ja) | 2017-01-18 |
EP3009486A1 (en) | 2016-04-20 |
CN105308138B (zh) | 2018-01-12 |
US20160126127A1 (en) | 2016-05-05 |
EP3009486A4 (en) | 2017-02-22 |
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