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JP5001788B2 - Photodetector - Google Patents

Photodetector Download PDF

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JP5001788B2
JP5001788B2 JP2007280863A JP2007280863A JP5001788B2 JP 5001788 B2 JP5001788 B2 JP 5001788B2 JP 2007280863 A JP2007280863 A JP 2007280863A JP 2007280863 A JP2007280863 A JP 2007280863A JP 5001788 B2 JP5001788 B2 JP 5001788B2
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light receiving
light
signal processing
resin
region
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JP2009111090A (en
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正敏 石原
直 井上
洋夫 山本
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Hamamatsu Photonics KK
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/10—Bump connectors; Manufacturing methods related thereto
    • H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • H01L2224/161—Disposition
    • H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
    • H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
    • H01L2224/321—Disposition
    • H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73201—Location after the connecting process on the same surface
    • H01L2224/73203—Bump and layer connectors
    • H01L2224/73204—Bump and layer connectors the bump connector being embedded into the layer connector

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  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Solid State Image Pick-Up Elements (AREA)
  • Light Receiving Elements (AREA)

Description

本発明は、光検出装置に関する。   The present invention relates to a light detection device.

光検出装置として、複数の受光素子と、これらの受光素子から出力された電気信号が入力される信号処理素子と、を備えているものが知られている（例えば、特許文献１参照）。特許文献１に記載された光検出装置では、信号処理装置は、各受光素子に対向して配置されると共に導電性バンプを介して接続されており、各受光素子と信号処理素子との間の空隙に電気絶縁性を有する樹脂が充填されている。
米国特許第６８２８５４５号明細書 2. Description of the Related Art As a light detection device, a device including a plurality of light receiving elements and a signal processing element to which an electrical signal output from these light receiving elements is input is known (for example, see Patent Document 1). In the photodetection device described in Patent Document 1, the signal processing device is arranged to face each light receiving element and is connected via a conductive bump, and between each light receiving element and the signal processing element. The gap is filled with a resin having electrical insulation.
US Pat. No. 6,828,545

しかしながら、特許文献１に記載された光検出装置では、迷光が発生し、この迷光が受光素子に入射し、ノイズとして検出されてしまうという問題点を有している。すなわち、特許文献１に記載された光検出装置では、上述した樹脂における受光素子及び信号処理素子から露出する表面から光が入射すると、当該表面で散乱すると共に樹脂を透過して信号処理素子の表面（受光素子に対向する面）で反射し、これらの散乱光及び反射光が迷光となって、受光素子の裏面（信号処理素子に対向する面）又は側面から入射する懼れがある。   However, the light detection device described in Patent Document 1 has a problem in that stray light is generated, and this stray light enters the light receiving element and is detected as noise. That is, in the light detection device described in Patent Document 1, when light is incident from the surface exposed from the light receiving element and the signal processing element in the resin, the surface of the signal processing element is scattered on the surface and transmitted through the resin. There is a possibility that these scattered light and reflected light become stray light that is reflected from (the surface facing the light receiving element) and enters from the back surface (surface facing the signal processing element) or the side surface of the light receiving element.

ところで、信号処理素子は、その作動の際に発熱して、赤外線を放射することがある。このため、特許文献１に記載された光検出装置では、受光素子が赤外線の波長領域に感度を有する場合、信号処理素子から放射される赤外線が受光素子の裏面又は側面から入射し、ノイズとして検出されてしまうという問題点も有している。   By the way, the signal processing element may generate heat during its operation and emit infrared rays. For this reason, in the light detection device described in Patent Document 1, when the light receiving element has sensitivity in the infrared wavelength region, infrared light emitted from the signal processing element enters from the back surface or side surface of the light receiving element and is detected as noise. It also has the problem of being done.

そこで、本発明はこのような事情に鑑みてなされたものであり、測定光の検出精度を高めることが可能な光検出装置を提供することを目的とする。   Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a photodetector that can increase the detection accuracy of measurement light.

本発明に係る光検出装置は、入射した光の光量に応じた電気信号をそれぞれ出力する複数の受光素子と、複数の受光素子に対向して配置されていると共に、導電性バンプを介して接続されており、複数の受光素子から出力された電気信号が入力される信号処理素子と、電気絶縁性及び遮光性を有し、少なくとも複数の受光素子と信号処理素子との間の空隙に充填されている樹脂と、を備えている。   The light detection device according to the present invention includes a plurality of light receiving elements that respectively output electrical signals corresponding to the amount of incident light, and are disposed to face the plurality of light receiving elements, and are connected via conductive bumps. A signal processing element to which electric signals output from a plurality of light receiving elements are input, and has electrical insulation and light shielding properties, and is filled in a gap between at least the plurality of light receiving elements and the signal processing element. And a resin.

本発明に係る光検出装置では、遮光性を有する上記樹脂が、少なくとも複数の受光素子と信号処理素子との間の空隙に充填されていることから、迷光が発生した場合でも、発生した迷光が受光素子における信号処理素子に対向する面側から入射することを防ぐことができる。これにより、検出されるノイズを低減させ、測定光の検出精度を高めることができる。また、複数の受光素子が赤外線の波長領域に感度を有する場合でも、信号処理素子から放射される赤外線が受光素子における信号処理素子に対向する面側から入射することを防ぎ、検出されるノイズを低減できる。   In the light detection device according to the present invention, since the resin having light shielding properties is filled in at least the gaps between the plurality of light receiving elements and the signal processing element, the generated stray light is generated even when stray light is generated. It can prevent entering from the surface side which opposes the signal processing element in a light receiving element. Thereby, the detected noise can be reduced and the detection accuracy of the measurement light can be increased. Moreover, even when a plurality of light receiving elements have sensitivity in the infrared wavelength region, the infrared rays emitted from the signal processing elements are prevented from entering from the side of the light receiving element facing the signal processing elements, and the detected noise is reduced. Can be reduced.

また、複数の受光素子は、互いに所定の間隔を有して配置されており、樹脂は、信号処理素子における受光素子間に対応する領域を覆うように配置されていることが好ましい。この場合、複数の受光素子間から信号処理素子に光が入射することが抑制され、迷光の発生を防ぐことができる。   Moreover, it is preferable that the plurality of light receiving elements are arranged at a predetermined interval from each other, and the resin is arranged so as to cover a region corresponding to the space between the light receiving elements in the signal processing element. In this case, light is prevented from entering the signal processing element from between a plurality of light receiving elements, and stray light can be prevented from being generated.

また、樹脂は、複数の受光素子の側面を覆うように配置されていることが好ましい。この場合、受光素子の側面からの迷光を抑制することができる。この結果、光検出装置における測定光の検出精度をより一層高めることができる。   Moreover, it is preferable that resin is arrange | positioned so that the side surface of a some light receiving element may be covered. In this case, stray light from the side surface of the light receiving element can be suppressed. As a result, the detection accuracy of the measurement light in the light detection device can be further enhanced.

また、信号処理素子は、複数の受光素子が対向する第１の領域と、第１の領域の外周側に位置する第２の領域と、を含み、樹脂は、第２の領域を覆うように配置されていることが好ましい。この場合、信号処理素子における第２の領域に光が入射することが抑制され、迷光の発生を防ぐことができる。   The signal processing element includes a first region where the plurality of light receiving elements face each other, and a second region located on the outer peripheral side of the first region, and the resin covers the second region. It is preferable that they are arranged. In this case, light is suppressed from entering the second region of the signal processing element, and stray light can be prevented from being generated.

また、樹脂は、遮光性を有するフィラーが含有されることにより、遮光性を有することが好ましく、さらには、入射光を吸収することにより、遮光性を有することが好ましい。   Further, the resin preferably has a light shielding property by containing a filler having a light shielding property, and further preferably has a light shielding property by absorbing incident light.

また、導電性バンプ導電性バンプは、柱状であり、そのアスペクト比が１以上に設定されていることが好ましい。   Further, the conductive bump conductive bump has a columnar shape, and its aspect ratio is preferably set to 1 or more.

本発明によれば、迷光が発生して受光素子に入射することを防ぎ、測定光の検出精度を高めることが可能な光検出装置を提供することができる。   According to the present invention, it is possible to provide a photodetection device that can prevent stray light from entering the light receiving element and increase the detection accuracy of measurement light.

以下、本発明の実施形態に係る光検出装置について添付図面を参照して説明する。なお、説明において、同一要素又は同一機能を有する要素には、同一符号を用いることとし、重複する説明は省略する。   Hereinafter, a photodetecting device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

図１を参照して、本実施形態に係る光検出装置の構成を説明する。図１は、本実施形態に係る光検出装置の断面構成を示す模式図である。光検出装置ＰＤ１は、複数の受光素子１と、信号処理素子１０と、樹脂２０と、を備えている。   With reference to FIG. 1, the structure of the photon detector according to the present embodiment will be described. FIG. 1 is a schematic diagram illustrating a cross-sectional configuration of the photodetecting device according to the present embodiment. The light detection device PD1 includes a plurality of light receiving elements 1, a signal processing element 10, and a resin 20.

各受光素子１は、互いに所定の間隔を有すると共に、信号処理素子１０に対向して配置されている。各受光素子１は、１次元又は２次元に配列されている。受光素子１は、信号処理素子１０に対向する主面１ａ側において、複数のｐｎ接合領域３が配列されており、各ｐｎ接合領域３が受光素子１の光感応領域として機能する。   Each light receiving element 1 has a predetermined distance from each other and is disposed to face the signal processing element 10. Each light receiving element 1 is arranged in one or two dimensions. In the light receiving element 1, a plurality of pn junction regions 3 are arranged on the main surface 1 a side facing the signal processing element 10, and each pn junction region 3 functions as a photosensitive region of the light receiving element 1.

受光素子１は、いわゆるホトダイオードアレイであり、Ｓｉからなるｎ型（第１導電型）の半導体基板５を有している。ｎ型半導体基板５には主面１ａ側において、複数のｐ型（第２導電型）領域７がアレイ状に配列（１次元又は２次元配列）されている。各ｐ型領域７とｎ型半導体基板５との間で形成されるｐｎ接合領域３により、各ホトダイオードの光感応領域が構成されている。   The light receiving element 1 is a so-called photodiode array, and includes an n-type (first conductivity type) semiconductor substrate 5 made of Si. A plurality of p-type (second conductivity type) regions 7 are arrayed (one-dimensional or two-dimensional array) on the n-type semiconductor substrate 5 on the main surface 1a side. The pn junction region 3 formed between each p-type region 7 and the n-type semiconductor substrate 5 constitutes a photosensitive region of each photodiode.

主面１ａには、アンダーバンプメタル（ＵＢＭ）としての電極８、９が配置されている。電極８は、対応するｐ型領域７に電気的に接続されている。電極９は、ｎ型半導体基板５に電気的に接続されている。各電極８、９は、ｐ型領域７又はｎ型半導体基板５に接続された電極配線（図示せず）上に例えばＮｉ、Ａｕを順次メッキすることにより形成される。   Electrodes 8 and 9 as under bump metal (UBM) are arranged on the main surface 1a. The electrode 8 is electrically connected to the corresponding p-type region 7. The electrode 9 is electrically connected to the n-type semiconductor substrate 5. Each of the electrodes 8 and 9 is formed by sequentially plating, for example, Ni and Au on an electrode wiring (not shown) connected to the p-type region 7 or the n-type semiconductor substrate 5.

受光素子１は、光が入射すると、光が入射したｐ型領域７において入射した光の光量に応じてキャリアが生成される。生成されたキャリアによる光電流は、ｐ型領域７に接続された電極８から取り出される。これにより、各受光素子１は、入射した光の光量に応じた電気信号をそれぞれ出力することとなる。   When light is incident on the light receiving element 1, carriers are generated according to the amount of incident light in the p-type region 7 where the light is incident. The photocurrent generated by the generated carriers is taken out from the electrode 8 connected to the p-type region 7. Thereby, each light receiving element 1 outputs an electrical signal corresponding to the amount of incident light.

受光素子１は、上述した構成のホトダイオードアレイに限られることなく、ｐｎ接合を有する量子型検出素子や、熱型検出素子等であれば、いずれの検出素子を用いてもよい。量子型検出素子としては、Ｓｉホトダイオードアレイのような検出素子の他、ＩｎＧａＡｓ、ＧａＡｓ、ＡｌＧａＡｓ、ＩｎＳｂ、ＨｇＣｄＴｅ、又はＩｎＡｓＳｎ等の光起電力型の検出素子、あるいは、ＰｂＳ、ＰｂＳｅ、ＩｎＳｂ、又はＨｇＣｄＴｅ等の光導電型の検出素子が挙げられる。熱型検出素子としては、サーモパイル、ボロメータ、又はニューマチックセル等が挙げられる。量子型検出素子の構造も、ＭＱＷ（ｍｕｌｔｉｐｌｅ−ｑｕａｎｔｕｍ−ｗｅｌｌ）構造であってもよい。熱型検出素子の構造は、メンブレン構造であってもよい。   The light receiving element 1 is not limited to the photodiode array having the above-described configuration, and any detecting element may be used as long as it is a quantum type detecting element having a pn junction, a thermal type detecting element, or the like. As a quantum type detection element, in addition to a detection element such as a Si photodiode array, a photovoltaic type detection element such as InGaAs, GaAs, AlGaAs, InSb, HgCdTe, or InAsSn, or PbS, PbSe, InSb, or HgCdTe. And the like. Examples of the thermal detection element include a thermopile, a bolometer, or a pneumatic cell. The structure of the quantum detection element may also be an MQW (multiple-quantum-well) structure. The structure of the thermal detection element may be a membrane structure.

信号処理素子１０は、上述したように、各受光素子１に対向して配置されており、信号読み出し回路、信号処理回路、及び信号出力回路（いずれも図示せず）等を有している。本実施形態では、信号処理素子１０は、ＳｉやＧａＡｓ等の半導体結晶からなる基板１１を有しており、各回路は基板１１に形成されている。信号処理素子１０はセラミックスやＰＣＢ等の配線材料からなる配線パターンにより構成してもよい。   As described above, the signal processing element 10 is disposed to face each of the light receiving elements 1 and includes a signal readout circuit, a signal processing circuit, a signal output circuit (all not shown), and the like. In the present embodiment, the signal processing element 10 includes a substrate 11 made of a semiconductor crystal such as Si or GaAs, and each circuit is formed on the substrate 11. The signal processing element 10 may be constituted by a wiring pattern made of a wiring material such as ceramics or PCB.

基板１１は、各受光素子１が対向する第１の領域１１ａと、各第１の領域１１ａの外周側に位置する第２の領域１１ｂと、を含んでいる。第１の領域１１ａにおける、各受光素子１に対向する面側には、各電極８、９に対応して、アンダーバンプメタル（ＵＢＭ）としての複数の電極１３が配置されている。各電極１３は、信号読み出し回路等に接続された電極配線（図示せず）上に例えばＮｉ、Ａｕを順次メッキすることにより形成される。   The substrate 11 includes a first region 11a facing each light receiving element 1 and a second region 11b located on the outer peripheral side of each first region 11a. A plurality of electrodes 13 serving as under bump metal (UBM) are arranged on the surface side of the first region 11 a facing each light receiving element 1 in correspondence with the electrodes 8 and 9. Each electrode 13 is formed by sequentially plating, for example, Ni and Au on an electrode wiring (not shown) connected to a signal readout circuit or the like.

対応する電極８、９と電極１３とは、導電性バンプ１５により電気的かつ物理的にそれぞれ接続されている。これにより、各受光素子１と信号処理素子１０とが、電極８、９、１３及び導電性バンプ１５を通して、電気的に接続されることとなる。そして、信号処理素子１０には、受光素子１から出力された電気信号が入力される。ところで、信号処理素子１０は、一般に信号処理回路にＩＣ等を含んでおり、その作動の際に発熱して、赤外線を放射する。   Corresponding electrodes 8, 9 and electrode 13 are electrically and physically connected by conductive bumps 15, respectively. Thereby, each light receiving element 1 and the signal processing element 10 are electrically connected through the electrodes 8, 9, 13 and the conductive bump 15. The electrical signal output from the light receiving element 1 is input to the signal processing element 10. By the way, the signal processing element 10 generally includes an IC or the like in the signal processing circuit, and generates heat during its operation to emit infrared rays.

電極８、９、１３について、電極間の間隔（ピッチ）、サイズ（面積及び形状）、及び高さ、並びに、導電性バンプ１５の高さ及び形状は、それぞれ単独で決定される事項ではなく、導電性バンプ１５に用いられる材料、その形成方法、受光素子１や信号処理素子１０の大きさ、製造時の反り等に依存して決定される事項である。また、ｐ型領域７の間隔（ピッチ）は、受光素子１からの出力信号の用途に応じて、様々な値を取り得る。   For the electrodes 8, 9, and 13, the spacing (pitch), size (area and shape) and height between the electrodes, and the height and shape of the conductive bumps 15 are not matters determined independently, This is a matter determined depending on the material used for the conductive bump 15, its forming method, the size of the light receiving element 1 and the signal processing element 10, warpage during manufacturing, and the like. Further, the interval (pitch) between the p-type regions 7 can take various values depending on the use of the output signal from the light receiving element 1.

導電性バンプ１５は、柱状を呈しており、そのアスペクト比が１以上に設定されている。ここで「アスペクト比」とは、導電性バンプ１５の高さを、導電性バンプ１５における高さ方向での端部の幅で除した値を示す。導電性バンプ１５は、厚膜レジストや２層レジストを用いて蒸着する方式、バンプの水平方向へのめっき成長を選択的に抑制する方式、インクジェット方式（例えば特開２００４−１７２０５号公報参照）、又は、ピラミッド方式（例えば特開２００５−２４３７１４号公報参照）等を用いて形成される。これらの方式によりバンプを異方性成長させることで、高いアスペクト比を有する柱状のバンプを形成できる。   The conductive bump 15 has a columnar shape, and its aspect ratio is set to 1 or more. Here, the “aspect ratio” indicates a value obtained by dividing the height of the conductive bump 15 by the width of the end of the conductive bump 15 in the height direction. The conductive bump 15 is a method of vapor deposition using a thick film resist or a two-layer resist, a method of selectively suppressing plating growth in the horizontal direction of the bump, an ink jet method (for example, see Japanese Patent Application Laid-Open No. 2004-17205), Alternatively, it is formed using a pyramid method (for example, see JP-A-2005-243714). By making the bumps grow anisotropically by these methods, a columnar bump having a high aspect ratio can be formed.

樹脂２０は、電気絶縁性を有すると共に、各受光素子１と信号処理素子１０との間の空隙に充填されている。樹脂２０は、導電性バンプ１５の機械的強度を確保すると共に、各受光素子１と信号処理素子１０との間の空隙への異物の混入を防ぎ、アンダーフィル材として機能する。樹脂２０は、第２の領域１１ｂを覆っており、更に、各受光素子１の側面を覆うように配置されている。樹脂２０には、例えば、エポキシ系樹脂、ウレタン系樹脂、シリコーン系樹脂、若しくはアクリル系樹脂、又はこれらを複合させたものを用いることができる。   The resin 20 has electrical insulation and is filled in a gap between each light receiving element 1 and the signal processing element 10. The resin 20 secures the mechanical strength of the conductive bumps 15, prevents foreign matters from entering the gaps between the light receiving elements 1 and the signal processing elements 10, and functions as an underfill material. The resin 20 covers the second region 11b and is disposed so as to cover the side surface of each light receiving element 1. As the resin 20, for example, an epoxy resin, a urethane resin, a silicone resin, an acrylic resin, or a composite of these can be used.

樹脂２０は、遮光性を有するフィラー（例えば、カーボン粒子、アルミナ粒子、ＰｂＳ、又はＰｂＳｅ等）が含有された樹脂からなる。フィラーとしてＰｂＳ、又はＰｂＳｅ等の所定波長帯域において吸光特性を示す材料を用いた場合、樹脂２０は、入射光を吸収することにより遮光することとなる。樹脂２０は、入射光を反射することにより遮光してもよいが、反射光が迷光となる懼れがあることから、入射光が吸収することにより遮光することが好ましい。樹脂２０は、フィラーが含有された樹脂を各受光素子１と信号処理素子１０との間の空隙に充填されるように第１の領域１１ａ及び第２の領域１１ｂに付与して硬化させることにより形成してもよく、上記樹脂を各受光素子１と信号処理素子１０との間の空隙に充填して硬化させた後、受光素子１及び信号処理素子１０から露出した表面に更に付与して硬化させることにより形成してもよい。   The resin 20 is made of a resin containing a light-shielding filler (for example, carbon particles, alumina particles, PbS, PbSe, or the like). When a material exhibiting light absorption characteristics in a predetermined wavelength band such as PbS or PbSe is used as the filler, the resin 20 is shielded by absorbing incident light. The resin 20 may be shielded by reflecting incident light. However, since the reflected light may be stray light, the resin 20 is preferably shielded by absorbing incident light. The resin 20 is formed by applying a resin containing a filler to the first region 11a and the second region 11b so as to fill a gap between each light receiving element 1 and the signal processing element 10 and curing the resin. The resin may be formed and filled in the gaps between the light receiving elements 1 and the signal processing elements 10 and cured, and then further applied to the surfaces exposed from the light receiving elements 1 and the signal processing elements 10 and cured. You may form by making.

以上のように、本実施形態においては、樹脂２０が、各受光素子１と信号処理素子１０との間の空隙に充填されて配置されているため、迷光が発生した場合でも、発生した迷光が各受光素子１における信号処理素子１０に対向する面側から入射することを防ぐことができる。これにより、検出されるノイズを低減させ、測定光の検出精度を高めることができる。また、受光素子１が赤外線の波長領域に感度を有する赤外線検出素子であっても、信号処理素子１０から放射される赤外線が各受光素子１における信号処理素子１０に対向する面側から入射することを防ぎ、検出されるノイズを低減できる。   As described above, in the present embodiment, since the resin 20 is filled in the gap between each light receiving element 1 and the signal processing element 10, the generated stray light is generated even when stray light is generated. It can prevent entering from the surface side which opposes the signal processing element 10 in each light receiving element 1. FIG. Thereby, the detected noise can be reduced and the detection accuracy of the measurement light can be increased. Further, even if the light receiving element 1 is an infrared detecting element having sensitivity in the infrared wavelength region, the infrared light emitted from the signal processing element 10 is incident from the side of the surface facing the signal processing element 10 in each light receiving element 1. Can be prevented and the detected noise can be reduced.

本実施形態においては、樹脂２０は、第２の領域１１ｂの受光素子１間に対応する領域を覆うように配置されている。これにより、上記領域への光の入射が抑制され、迷光の発生を防ぐことができる。   In the present embodiment, the resin 20 is disposed so as to cover a region corresponding to the space between the light receiving elements 1 in the second region 11b. Thereby, the incidence of light on the region is suppressed, and the generation of stray light can be prevented.

本実施形態においては、樹脂２０は、第２の領域１１ｂの基板１１の外縁部に対応する領域を覆うように配置されている。これにより、上記領域への光の入射が抑制され、迷光の発生を防ぐことができる。   In the present embodiment, the resin 20 is disposed so as to cover a region corresponding to the outer edge portion of the substrate 11 in the second region 11b. Thereby, the incidence of light on the region is suppressed, and the generation of stray light can be prevented.

本実施形態においては、樹脂２０は、各受光素子１の側面を覆うように配置されている。これにより、迷光が受光素子１の側面から入射することが抑制できる。この結果、光検出装置ＰＤ１における測定光の検出精度をより一層高めることができる。特に、本実施形態では、樹脂２０は、受光素子１の上端（信号処理素子１０に対向する主面１ａに対向する主面の端）まで覆っており、迷光の入射をより一層確実に防ぐことができる。   In the present embodiment, the resin 20 is disposed so as to cover the side surface of each light receiving element 1. Thereby, stray light can be prevented from entering from the side surface of the light receiving element 1. As a result, the detection accuracy of the measurement light in the light detection device PD1 can be further increased. In particular, in the present embodiment, the resin 20 covers up to the upper end of the light receiving element 1 (the end of the main surface facing the main surface 1a facing the signal processing element 10), thereby preventing the stray light from entering more reliably. Can do.

各受光素子１と信号処理素子１０との間の空隙に遮光性を有さない樹脂３０がアンダーフィル材として充填されている場合には、図２に示されるように、受光素子１及び信号処理素子１０から露出する表面から光Ｌが入射すると、当該表面で散乱すると共に樹脂２０を透過して信号処理素子１０における受光素子１に対向する面で反射する。そして、これらの散乱光及び反射光（図中、破線で示す）が迷光となって、受光素子１における信号処理素子１０に対向する主面又は側面から入射する懼れがある。さらに、信号処理部１０から放射された赤外線Ｉ（図中、一点鎖線で示す）が、受光素子１の裏面又は側面から入射する懼れもある。これに対して、本実施形態では、上述したように、これらの迷光が発生することはなく、受光素子１に信号処理部１０から放射された赤外線Ｉが入射することもない。   When the gap between each light receiving element 1 and the signal processing element 10 is filled with a resin 30 having no light shielding property as an underfill material, as shown in FIG. 2, the light receiving element 1 and the signal processing When the light L enters from the surface exposed from the element 10, the light L is scattered on the surface and transmitted through the resin 20 and reflected by the surface of the signal processing element 10 facing the light receiving element 1. These scattered light and reflected light (indicated by broken lines in the figure) become stray light and may be incident from the main surface or side surface of the light receiving element 1 facing the signal processing element 10. Furthermore, the infrared rays I (indicated by the alternate long and short dash line in the figure) radiated from the signal processing unit 10 may be incident from the back surface or the side surface of the light receiving element 1. On the other hand, in this embodiment, as described above, these stray lights are not generated, and the infrared rays I emitted from the signal processing unit 10 are not incident on the light receiving element 1.

本実施形態では、導電性バンプ１５のアスペクト比が１以上に設定されている。このように、アスペクト比が１以上と設定されることにより、受光素子１と信号処理素子１０との間隔は比較的広くなる。これにより、受光素子１と信号処理素子１０との間の空隙への樹脂の充填を迅速かつ容易に行うことができる。また、樹脂２０に含有されるフィラーのサイズが大きい場合でも、フィラーが含有された樹脂の上記空隙への充填が可能となる。   In the present embodiment, the aspect ratio of the conductive bump 15 is set to 1 or more. Thus, when the aspect ratio is set to 1 or more, the distance between the light receiving element 1 and the signal processing element 10 becomes relatively wide. Thereby, filling of the resin into the gap between the light receiving element 1 and the signal processing element 10 can be performed quickly and easily. In addition, even when the size of the filler contained in the resin 20 is large, the resin containing the filler can be filled into the voids.

ところで、本実施形態及び変形例に係る光検出装置ＰＤ１は、例えば、ガス分析の非分散赤外分析計（ＮＤＩＲ）に適用することができる。回折格子など分散型グレーティングを利用したミニ分光器の受光素子には、ホトダイオードアレイやイメージセンサ等の受光素子が用いられている。連続スペクトルを観察するには、１チップからなるホトダイオードアレイやイメージセンサが必要となるが、用途によっては、複数の固定波長が検出できればよい場合もある。例えば、上述した非分散赤外分析計では、必要とするサンプル波長とリファレンス波長は決まっており、画素が連続した長尺の高価なホトダイオードアレイやイメージセンサは不要である。したがって、必要な波長を検出し得る画素数の小さな受光素子を複数配置することで、受光素子にかかる費用を低減することができる。回折格子から出射された連続スペクトル上に複数の受光素子を配置させた時に、受光素子間で反射する光等が迷光として作用し問題となる。しかしながら、本実施形態及び変形例に係る光検出装置ＰＤ１では上述したように迷光の発生が抑制されるため、非分散赤外分析計等にも適用することができる。   By the way, the photodetector PD1 according to the present embodiment and the modification can be applied to, for example, a non-dispersive infrared analyzer (NDIR) for gas analysis. A light receiving element such as a photodiode array or an image sensor is used as a light receiving element of a mini-spectrometer using a dispersion type grating such as a diffraction grating. To observe a continuous spectrum, a photodiode array or image sensor consisting of one chip is required. However, depending on the application, it may be sufficient to detect a plurality of fixed wavelengths. For example, in the non-dispersive infrared analyzer described above, the required sample wavelength and reference wavelength are determined, and a long and expensive photodiode array or image sensor with continuous pixels is unnecessary. Therefore, by arranging a plurality of light receiving elements with a small number of pixels that can detect a necessary wavelength, the cost of the light receiving elements can be reduced. When a plurality of light receiving elements are arranged on the continuous spectrum emitted from the diffraction grating, the light reflected between the light receiving elements acts as stray light and becomes a problem. However, since the generation of stray light is suppressed in the photodetector PD1 according to the present embodiment and the modification as described above, it can be applied to a non-dispersive infrared analyzer or the like.

以上、本発明の好適な実施形態について説明してきたが、本発明は必ずしも上述した実施形態に限定されるものではなく、その要旨を逸脱しない範囲で様々な変更が可能である。例えば、受光素子１の数及び配列、ｐ型領域７の数及び配列は、図示されたものに限られない。また、受光素子１は、ｐ型半導体基板に光感応領域としてｎ型領域を配列したものであっても良い。   The preferred embodiments of the present invention have been described above. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the number and arrangement of the light receiving elements 1 and the number and arrangement of the p-type regions 7 are not limited to those illustrated. The light receiving element 1 may be an n-type region arranged as a photosensitive region on a p-type semiconductor substrate.

また、樹脂２０は、必ずしも各受光素子１の側面を覆う必要はない。しかしながら、上述したように迷光及び赤外線が受光素子１の側面から入射することを抑制するためには、樹脂２０は受光素子１の側面を覆っている必要がある。   Further, the resin 20 does not necessarily need to cover the side surface of each light receiving element 1. However, as described above, the resin 20 needs to cover the side surface of the light receiving element 1 in order to prevent stray light and infrared rays from entering from the side surface of the light receiving element 1.

本実施形態に係る光検出装置の断面構成を示す模式図である。It is a schematic diagram which shows the cross-sectional structure of the photon detection apparatus which concerns on this embodiment. 迷光等が受光素子に入射する状態を説明するための模式図である。It is a schematic diagram for demonstrating the state in which a stray light etc. inject into a light receiving element.

符号の説明Explanation of symbols

１…受光素子、１０…信号処理素子、１１ａ…第１の領域、１１ｂ…第２の領域、１５…導電性バンプ、２０…樹脂、３０…アンダーフィル材、ＰＤ１…光検出装置。   DESCRIPTION OF SYMBOLS 1 ... Light receiving element, 10 ... Signal processing element, 11a ... 1st area | region, 11b ... 2nd area | region, 15 ... Conductive bump, 20 ... Resin, 30 ... Underfill material, PD1 ... Photodetection apparatus.

Claims (2)

入射した光の光量に応じた電気信号をそれぞれ出力する複数の受光素子と、
前記複数の受光素子に対向して配置されていると共に、導電性バンプを介して接続されており、前記複数の受光素子から出力された電気信号が入力される信号処理素子と、
電気絶縁性及び遮光性を有し、少なくとも前記複数の受光素子と前記信号処理素子との間の空隙に充填されている樹脂と、を備え、
前記複数の受光素子は、互いに所定の間隔を有して配置されていると共に、前記信号処理素子に対向する主面側に１次元又は２次元配列された複数の光感応領域を有し、
前記樹脂は、前記信号処理素子における前記受光素子間に対応する領域、及び、前記複数の受光素子の側面を覆うように配置されていると共に、遮光性を有するフィラーが含有され且つ入射光を吸収することにより遮光性を有しており、
前記導電性バンプは、柱状であり、そのアスペクト比が１以上に設定されていることを特徴とする光検出装置。 A plurality of light receiving elements that each output an electrical signal corresponding to the amount of incident light;
A signal processing element that is disposed so as to face the plurality of light receiving elements and is connected via a conductive bump, to which an electrical signal output from the plurality of light receiving elements is input,
A resin having electrical insulating properties and light shielding properties, and at least filling a gap between the plurality of light receiving elements and the signal processing elements ,
The plurality of light receiving elements are arranged at a predetermined interval from each other, and have a plurality of photosensitive regions arranged one-dimensionally or two-dimensionally on the main surface side facing the signal processing elements,
The resin is disposed so as to cover a region corresponding to the space between the light receiving elements in the signal processing element and the side surfaces of the plurality of light receiving elements, and contains a light-shielding filler and absorbs incident light. Has a light-shielding property,
The photo-detecting device, wherein the conductive bumps are columnar and have an aspect ratio of 1 or more . 前記信号処理素子は、前記複数の受光素子が対向する第１の領域と、前記第１の領域の外周側に位置する第２の領域と、を含み、
前記樹脂は、前記第２の領域を覆うように配置されていることを特徴とする請求項１に記載の光検出装置。 The signal processing element includes a first region where the plurality of light receiving elements face each other, and a second region located on the outer peripheral side of the first region,
The resin A light detecting device according to claim 1, characterized in that it is arranged to cover the second region.
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