Source: http://www.google.com/patents/US7838994?dq=5958006
Timestamp: 2016-10-21 23:22:18
Document Index: 119935035

Matched Legal Cases: ['art 20', 'art 20', 'art 20', 'art 20', 'arts 20', 'art 20', 'art 20', 'arts 20', 'art 20', 'art 20', 'arts 20']

Patent US7838994 - Semiconductor device and radiation detector employing it - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA wiring substrate 20, comprising a glass substrate, which is provided with through holes 20 c, each having a tapered part 20 d that becomes large in opening area at the side of an input surface 20 a, and conductive members 21, formed on the inner walls of through holes 20 c, is used. A semiconductor...http://www.google.com/patents/US7838994?utm_source=gb-gplus-sharePatent US7838994 - Semiconductor device and radiation detector employing itAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7838994 B2Publication typeGrantApplication numberUS 10/546,604PCT numberPCT/JP2004/002136Publication dateNov 23, 2010Filing dateFeb 24, 2004Priority dateFeb 24, 2003Fee statusLapsedAlso published asCN1748299A, CN100407388C, EP1603155A1, EP1603155A4, US20060231961, WO2004075282A1Publication number10546604, 546604, PCT/2004/2136, PCT/JP/2004/002136, PCT/JP/2004/02136, PCT/JP/4/002136, PCT/JP/4/02136, PCT/JP2004/002136, PCT/JP2004/02136, PCT/JP2004002136, PCT/JP200402136, PCT/JP4/002136, PCT/JP4/02136, PCT/JP4002136, PCT/JP402136, US 7838994 B2, US 7838994B2, US-B2-7838994, US7838994 B2, US7838994B2InventorsKatsumi Shibayama, Yutaka Kusuyama, Masahiro HayashiOriginal AssigneeHamamatsu Photonics K.K.Export CitationBiBTeX, EndNote, RefManPatent Citations (38), Referenced by (4), Classifications (36), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetSemiconductor device and radiation detector employing it
US 7838994 B2Abstract
A wiring substrate 20, comprising a glass substrate, which is provided with through holes 20 c, each having a tapered part 20 d that becomes large in opening area at the side of an input surface 20 a, and conductive members 21, formed on the inner walls of through holes 20 c, is used. A semiconductor device 5 is arranged by connecting bump electrodes 17, provided on an output surface 15 b of a PD array 15 in correspondence with conductive members 21, to input portions 21 a of conductive members 21 formed on input surface 20 a of wiring substrate 20. A radiation detector is arranged by connecting a scintillator 10 via an optical adhesive agent 11 to a light-incident surface 15 a of PD array 15 and connecting a signal processing element 30 via bump electrodes 31 to output surface 20 b of wiring substrate 20. A semiconductor device, with which the semiconductor elements and the corresponding conductive paths of the wiring substrate are connected satisfactorily, and a radiation detector using this semiconductor device are thus provided.
a wiring substrate, provided with conduction paths, guiding the electrical signal between a signal input surface and a signal output surface, and connected to the semiconductor element at the signal input surface;
the wiring substrate comprising: a glass substrate, provided with through holes, and conductive members, disposed in the through holes and functioning as the conduction paths by providing electrical continuity between the signal input surface and the signal output surface;
the semiconductor element and the conductive members of the wiring substrate being electrically connected via bump electrodes formed on a surface of the semiconductor element connected to the wiring substrate and in correspondence with the conductive members; and
wherein each of the bump electrodes is connected to the corresponding conductive member in a manner such that a portion of the bump electrode enters into the interior of the through hole in which the conductive member is disposed;
each of the through holes in the glass substrate has
a first tapered part at the signal input surface side formed to a tapered shape, with which the opening area decreases gradually from the signal input surface towards the interior of the glass substrate so that the opening area at the signal input surface is larger than the opening area at a predetermined position in the interior of the glass substrate; and
a second tapered part at the signal output surface side formed to a tapered shape, with which the opening area decreases gradually from the signal output surface towards the interior of the glass substrate so that the opening area at the signal output surface is larger than the opening area at a predetermined position in the interior of the glass substrate;
each of the conductive members includes
a conducting portion, which is formed on the inner wall of the interior of the through hole that includes the first tapered part and the second tapered part;
an input portion, which is continuous with the conducting portion, formed on the signal input surface at an outer peripheral portion of the first tapered part, and arranged as an electrode pad to which the bump electrode is connected; and
an output portion, which is continuous with the conducting portion and formed on the signal output surface at an outer peripheral portion of the second tapered part; and
electrode pads, which are respectively electrically connected via wirings to the output portions of the corresponding conductive members, are further formed on the signal output surface, and the electrode pads are formed at a pitch which is smaller than a pitch of the through holes in the glass substrate.
2. The semiconductor device according to claim 1, wherein the glass substrate is formed by cutting a bundle-form glass member, formed by bundling fiber-form glass members, each comprising a core glass portion and a coating glass portion, provided at the periphery of the core glass portion, to a desired thickness and has the through holes provided therein by removal of the core glass portions.
3. The semiconductor device according to claim 1, wherein the glass substrate is provided with, as the through holes, at least a first through hole of a predetermined opening area at the signal input surface and a second through hole that differs in opening area at the signal input surface from the first through hole.
4. The semiconductor device according to claim 1, further comprising signal processing means, connected to the signal output surface of the wiring substrate and processing the electrical signal from the semiconductor element.
5. A radiation detector, arranged so as to include the semiconductor device according to claim 4 and comprising:
6. The radiation detector according to claim 5, wherein the glass substrate is formed of a predetermined glass material having a radiation shielding function.
7. The radiation detector according to claim 5, wherein the radiation detecting means comprises: a scintillator, generating scintillation light upon incidence of radiation; and the semiconductor element, detecting the scintillation light from the scintillator.
8. The radiation detector according to claim 5, wherein the radiation detecting means comprises the semiconductor element, detecting incident radiation.
This invention concerns a semiconductor device, provided with a wiring substrate that is provided with a conduction path that guides an electrical signal, and a radiation detector using this semiconductor device.
As a radiation detector for use in a CT sensor, etc., there is a detector of an arrangement wherein a scintillator is disposed on a light-incident surface of a semiconductor photodetecting element, which is a semiconductor element. With such a radiation detector, when an X-ray, γ-ray, charged particle beam or other radiation to be detected is made incident on the scintillator, scintillation light is generated inside the scintillator by the radiation. The semiconductor photodetecting element then detects the scintillation light that is made incident from the scintillator and output an electrical signal that is in accordance with the intensity of the radiation.
With a semiconductor device of an arrangement wherein the wiring substrate is connected to the semiconductor element, in mounting the chip of the semiconductor element by flip-chip bonding onto the wiring substrate, the semiconductor element and the corresponding conduction path of the wiring substrate are electrically connected via a bump electrode provided on the semiconductor element.
In order to achieve this object, this invention provides a semiconductor device comprising: (1) a semiconductor element, outputting an electrical signal; and (2) a wiring substrate, provided with a conduction path, guiding the electrical signal between a signal input surface and a signal output surface, and connected to the semiconductor element at the signal input surface; and wherein (3) the wiring substrate comprises: a glass substrate, provided with a through hole, with which the opening area at the signal input surface is larger than the opening area at a predetermined position in the interior of the glass substrate; and a conductive member, disposed in the through hole and functioning as the conduction path by providing electrical continuity between the signal input surface and the signal output surface; and (4) the semiconductor element and the conductive member of the wiring substrate are electrically connected via a bump electrode formed in correspondence with the conductive member.
With the above-described semiconductor device, a glass substrate, having a conductive member, serving as a conduction path, provided at a through hole that is formed to a predetermined shape and extending from the input surface to the output surface, is used as the wiring substrate that connects the semiconductor photodetecting element or other semiconductor element. The bump electrode of the semiconductor element is made to correspond to the through hole and conductive member to connect the semiconductor element with the corresponding conductive member of the wiring substrate.
With such an arrangement, in mounting the semiconductor element onto the wiring substrate, a portion of the bump electrode enters into the interior of a through hole, which is provided with a conductive member, while being guided by the shape of the through hole, which becomes larger in opening area at the side at which the bump electrode is connected. A semiconductor device, with which the semiconductor element and the corresponding conduction path of the wiring substrate are connected satisfactorily via the bump electrode, is thus realized. Here, in regard to the arrangement of the conduction path of the wiring substrate, the conductive member is preferably formed on the inner wall of the through hole provided in the glass substrate.
Also, the glass substrate is preferably arranged by cutting a bundle-form glass member, formed by bundling fiber-form glass members, each comprising a core glass portion and a coating glass portion, provided at the periphery of the core glass portion, to a desired thickness and has the through hole formed therein by removal of the core glass portion. The wiring substrate can thus be arranged by the glass substrate with which the through holes for disposing the conductive members are formed at the desired hole diameter and pitch.
In regard to the specific arrangement of the through holes, it is preferable that the through hole in the glass substrate has a predetermined range thereof at the signal input surface side formed to a tapered shape, with which the opening area decreases gradually from the signal input surface towards the interior of the glass substrate. Or, it is preferable that the through hole in the glass substrate has a predetermined range thereof at the signal input surface side formed to a recessed shape of a predetermined opening area that is greater than the opening area in a range that includes a predetermined position in the interior of the glass substrate.
This invention's radiation detector is a radiation detector arranged so as to include the above-described semiconductor device and comprises: (1) radiation detecting means that includes the semiconductor element and outputs the electrical signal upon detection of incident radiation; (2) signal processing means, processing the electrical signal from the radiation detecting means; and (3) a wiring substrate section, including the wiring substrate and having the signal input surface and the signal output surface being connected to the radiation detecting means and the signal processing means, respectively.
In regard to the arrangement of the radiation detecting means, the radiation detecting means can be arranged with a scintillator, which generates scintillation light upon incidence of radiation, and the semiconductor photodetecting element, which detects the scintillation light from the scintillator. Also, an arrangement having the semiconductor detecting element that detects the incident radiation may be used instead as the radiation detecting means.
FIG. 1 is a sectional side view showing the cross-sectional structure of an embodiment of a semiconductor device and a radiation detector using the same.
Preferred embodiments of this invention's semiconductor device and radiation detector using the same shall now be described in detail along with the drawings. In the description of the drawings, the same elements shall be provided with the same symbols and overlapping description shall be omitted. Also, the dimensional proportions of the drawings do not necessary match those of the description.
Wiring substrate 20 comprises a downstream side portion of semiconductor device 5. This wiring substrate 20 is provided with conduction paths that guide electrical signals between a signal input surface 20 a and a signal output surface 20 b and the above-described PD array 15 is connected to signal input surface 20 a. In the present embodiment, a glass substrate, arranged by forming a bundle-form glass member by bundling fiber-form glass members (glass fibers), each comprising a core glass portion and a coating glass portion, provided at the periphery of the core glass portion, and cutting the bundle-form glass member to a desired thickness in a predetermined direction that intersects the axes of the glass fibers, is used in wiring substrate 20. Here, since semiconductor device 5 is applied to a radiation detector, a lead glass material, which contains lead or other predetermined glass material having a radiation shielding function, is used as the glass material of wiring substrate 20.
In the glass substrate that comprises wiring substrate 20, through holes 20 c are formed so as to extend from signal input surface 20 a toward signal output surface 20 b by removal of the core glass portions at the centers of predetermined glass fibers among the plurality of glass fibers included in the glass substrate. Also, for each through hole 20 c, a conductive member 21, which provides electrical continuity between input surface 20 a and output surface 20 b and functions as a conduction path, is provided. In the present embodiment, 4�4=16 through holes 20 c and conductive members 21 are provided in correspondence with the arrangement of PD array 15. These through holes 20 c and conductive members 21 are formed at the same pitch as bump electrodes 17 on PD array 15.
A plurality (for example, 4�4=16) of through holes 20 c are formed and arrayed two-dimensionally in wiring substrate 20. As shown in FIG. 4B, each through hole 20 c is formed to have a circular cross-sectional shape with an axis perpendicular to input surface 20 a and output surface 20 b of wiring substrate 20 as its central axis. A predetermined range of this through hole 20 c at the signal input surface 20 a side is formed as a tapered part 20 d of tapered shape, with which the opening area decreases successively from input surface 20 a towards the interior of the glass substrate. Also, a predetermined range at the signal output surface 20 b side is formed as a tapered part 20 e of tapered shape, with which the opening area decreases successively from output surface 20 b towards the interior.
With these through holes 20 c, conductive members 21, each of which provides electrical continuity between input surface 20 a and output surface 20 b, are provided as members formed on the inner walls of through holes 20 c. Specifically, as shown in FIG. 4A and FIG. 4B, a conducting portion 21 c is formed at the inner wall of the interior of each through hole 20 c that includes tapered parts 20 d and 20 e. Also, an input portion 21 a, which is continuous with conducting portion 21 c, is formed on input surface 20 a at an outer peripheral portion of tapered part 20 d. Furthermore, an output portion 21 b, which is continuous with conducting portion 21 c, is formed on output surface 20 b at an outer peripheral portion of tapered part 20 e. Each conductive member 21, which is to serve as a conduction path of wiring substrate 20, is arranged by conducting portion 21 c, input portion 21 a, and output portion 21 b. As shown in FIG. 3A, input portions 21 a of conductive members 21 are disposed on input surface 20 a of wiring substrate 20 at positions corresponding to bump electrodes 17 on output surface 15 b of PD array 15. Here, bump electrodes 17 of PD array 15 are formed to correspond to through holes 20 c and conductive members 21 of wiring substrate 20 and input portions 21 a are arranged as electrode pads to which bump electrodes 17 are connected.
Each bump electrode 17 is connected to the corresponding conductive member 21 of wiring substrate 20 in a manner such that a portion of bump electrode 17 enters into the interior of through hole 20 c in which conductive member 21 is disposed. Photodiodes 16, which output the detected signals at PD array 15, are thus electrically connected via bump electrodes 17 to conductive members 21, which are the conduction paths of wiring substrate 20 that transmit the detected signals.
With semiconductor device 5, illustrated in FIG. 1 to FIGS. 4A and 4B, a glass substrate, having conductive members 21, serving as conductive paths, provided in through holes 20 c that extend from input surface 20 a to output surface 20 b and are formed to shapes having tapered parts 20 d and 20 e, is used as wiring substrate 20 that connects PD array 15, which is a semiconductor element array. Photodiodes 16 of PD array 15, which are the semiconductor elements, and the corresponding conductive members 21 of wiring substrate 20 are connected upon making bump electrodes 17 of PD array 15 correspond to through holes 20 c and conductive members 21. Bump electrodes 17 and conductive members 21 can thus be connected satisfactorily.
Also with the radiation detector to which semiconductor device 5 is applied, wiring substrate 20, which comprises semiconductor device 5 along with PD array 15 that is included in radiation detecting section 1, is used as wiring substrate section 2 that electrically connects radiation detecting section 1 and signal processing section 3 and transmits the detected signal. With such an arrangement, since photodiodes 16 of PD array 15 and conductive members 21 of wiring substrate 20 are connected satisfactorily, a radiation detector, with which the transmission of the detected signals from radiation detecting section 1 to signal processing section 3 and the processing of the detected signals at signal processing section 3 can be performed securely, is realized.
In applying such a semiconductor device, comprising a semiconductor element and a wiring substrate, to a radiation detector, a substrate, formed of a predetermined glass material having a radiation shielding function, is preferably used as the glass substrate used in wiring substrate 20. The transmission of radiation from radiation detecting section 1, positioned at the upper surface 20 a side of wiring substrate 20, to signal processing section 3, positioned at the lower surface 20 b side, can thereby be restrained.
With the above-described embodiment, a glass substrate, formed integrally from a plurality of glass fibers and provided at predetermined positions thereof with through holes 20 c that are formed by removing the core glass portions, is used as the glass substrate of wiring substrate 20. Wiring substrate 20 can thus be arranged by a glass substrate, wherein through holes 20 c for disposing conductive members 21 are formed to have the desired hole diameter and pitch. For example, with a glass substrate with such an arrangement, through holes 20 c can be formed to have a microscopic hole diameter and pitch. Wiring substrate 20 can also be readily made large in area and thin. As long as through holes of the above-described shape are provided, a glass substrate of another arrangement may be used instead.
As was described in relation to FIG. 1, with the present arrangement example, semiconductor device 5 is arranged using wiring substrate 20, wherein conductive members 21 are disposed in through holes 20 c of the glass substrate formed from glass fibers, and PD array 15, having bump electrodes 17 formed in correspondence with through holes 20 c and conductive members 21.
With the arrangement shown in FIG. 1, FIG. 5A, and FIG. 5B, a predetermined range at the input surface 20 a side of each through hole 20 c provided in wiring substrate 20 is made a tapered part 20 d. With such an arrangement, since the opening area (inner diameter of the circular shape) of each through hole 20 c becomes larger at the input surface 20 a side at which a bump electrode 17 is connected, bump electrode 17 enters into the interior of through hole 20 c while being guided by the shape of through hole 20 c with tapered part 20 d. Bump electrodes 17 can thus be connected securely to conductive members 21.
In general, such a through hole 20 c of wiring substrate 20 is preferably formed so that the opening area at the input surface 20 a will be greater than the opening area at a predetermined position (for example, a position within a range that includes the center position and wherein the opening area is fixed) in the interior of the glass substrate. A portion of bump electrode 17 is thereby made to enter into the interior of through hole 20 c while being guided by the shape of through hole 20 c, which becomes large in opening area at the side at which bump electrode 17 is connected, and a semiconductor device and radiation detector can thus be realized with which photodiodes 16 of PD array 15, which are semiconductor elements, are satisfactorily connected via bump electrodes 17 to the corresponding conductive members 21 of wiring substrate 20.
The above-described arrangement of through hole 20 c, which becomes large in opening area at the input surface 20 a side, is also effective in terms of aspects besides connection with the bump electrode 17. For example, with an arrangement wherein conductive members that are to serve as conduction paths are provided using the through holes formed in the glass substrate, the need to make the through holes microscopic in hole diameter arises in cases where the wirings themselves are to be made narrow in pitch, cases where radiation is to be shielded by the glass material of the wiring substrate in a radiation detector, etc.
In such cases where the through holes are small in hole diameter, it is difficult to form the conductive members on the inner walls of the through holes by vapor deposition, plating, sputtering, or other method. In this regard, if through holes 20 c are formed to have a shape with which the opening area becomes large at input surface 20 a, the forming of conductive members 21 on the inner walls of through holes 20 c is facilitated.
Besides the above-described arrangement wherein each through hole 20 c is made to have a tapered shape within a predetermined range at the input surface 20 a side, various other arrangements may be employed as specific arrangements of through holes 20 c of a shape, with which the opening area at input surface 20 a is larger than the opening area at a predetermined position in the interior of the glass substrate.
Then as shown in FIG. 11C, core glass portions 63 are removed from plate-like glass member 83 (core removal). Here, core glass portions 63 are removed by an etching technique that uses HNO3 or HCl. A plurality of through holes 84, which pass through plate-like glass member 83 in the thickness direction, are thereby formed. By then forming tapered parts or recessed parts, etc., in the through holes, a glass substrate with the through holes of the predetermined shape is formed.
First, the glass substrate, which is formed by cutting the bundle-form glass member made by bundling the plurality of glass fibers as described above and is provided with through holes by the removal of predetermined core glass portions and the forming of tapered parts, etc., is prepared. Wiring substrate 20, used in semiconductor device 5 is then prepared by forming conductive members that are to serve as conduction paths in the through holes and furthermore forming electrical wiring patterns, having the necessary electrodes and wirings, on the respective surfaces that are to become the input surface and the output surface.
With the arrangement shown in FIG. 1, for the wiring substrate of semiconductor device 5, conductive members 21, each comprising conducting portion 21 c, input portion 21 a, and output portion 21 b, are formed in through holes 20 c, each having tapered parts 20 d and 20 e and are provided in the glass substrate. Furthermore, electrode pads 22 and 24 and wirings 23 are formed on output surface 20 b. Wiring substrate 20 is thus prepared.
As has been described in detail above, this invention's semiconductor device and radiation detector using the same can be used as a semiconductor device and radiation detector using the same, wherein the semiconductor element and the corresponding conduction path of the wiring substrate are connected satisfactorily. That is, with an arrangement, wherein a glass substrate, with which conductive members that are to serve as conduction paths are provided in through holes of shapes that become large in opening area at the input surface, is used as the wiring substrate for connecting semiconductor photodetecting elements and other semiconductor elements and the semiconductor elements and the corresponding conductive members on the wiring substrate are connected upon making the bump electrodes of the semiconductor elements correspond to the through holes and the conductive members, a portion of each bump electrode enters into the interior of a through hole at which a conductive member is provided while being guided by the shape of the through hole that becomes large in opening area at the side at which the bump electrode is connected in the process of mounting the semiconductor elements onto the wiring substrate. A semiconductor device, with which the semiconductor elements and the corresponding conduction paths of the wiring substrate are connected satisfactorily via the bump electrodes, is thereby realized.
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JenningsElectrodeposition of metals in high-aspect ratio cavities using modulated reverse electric fieldsJP2001318155A Title not availableJP2001351509A Title not availableJP2003264280A Title not availableJP2004128225A Title not availableJP2004265883A Title not availableJP2004265884A Title not availableJP2004265948A Title not availableJPH0351477A Title not availableJPH0945805A Title not availableJPH1056040A Title not availableJPH02164045A Title not availableJPH03116627A Title not availableJPH03203341A Title not availableJPH05243330A Title not availableJPH11121648A Title not availableJPH11337646A Title not availableJPS6326592A Title not availableJPS6352432A Title not availableJPS57186067A Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS9285489Aug 29, 2013Mar 15, 2016General Electric CompanyOrganic x-ray detector assembly and method of manufacturing sameUS9322938 *Mar 14, 2011Apr 26, 2016Siemens AktiengesellschaftDetector module for a radiation detector and radiation detectorUS20110226951 *Sep 22, 2011Siemens AktiengesellschaftDetector Module For A Radiation Detector And Radiation DetectorUS20150228569 *Feb 3, 2015Aug 13, 2015Marvell World Trade Ltd.Method and apparatus for improving the reliability of a connection to a via in a substrate* Cited by examinerClassifications U.S. Classification257/774, 257/E21.578International ClassificationH05K1/03, H05K3/34, H01L31/09, H01L23/29, H01L21/60, H01L23/13Cooperative ClassificationY02P70/613, H01L2224/1403, H01L2224/16235, H01L2924/3025, H01L2924/01079, H01L2924/04941, H01L2924/01046, H01L27/14618, H01L2924/12044, H01L2924/15312, H05K3/3436, H01L2924/01078, H05K2203/0455, H01L23/13, H05K1/0306, G01T1/2018, H01L2924/15165, H01L27/14634, H01L2224/16237, H01L27/14663, H05K2201/09827, H01L2924/15153European ClassificationH01L27/146A16, H01L23/13, H01L27/146A6, H01L27/146F5I, H05K3/34C4B, G01T1/20PLegal EventsDateCodeEventDescriptionMay 31, 2006ASAssignmentOwner name: HAMAMATSU PHOTONICS K.K., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHIBAYAMA, KATSUMI;KUSUYAMA, YUTAKA;HAYASHI, MASAHIRO;REEL/FRAME:018092/0069;SIGNING DATES FROM 20050825 TO 20050830Jul 3, 2014REMIMaintenance fee reminder mailedNov 23, 2014LAPSLapse for failure to pay maintenance feesJan 13, 2015FPExpired due to failure to pay maintenance feeEffective date: 20141123RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services