Source: http://www.google.com/patents/US20050258350?dq=6008737
Timestamp: 2017-12-11 06:13:14
Document Index: 284675899

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'arts 3', 'arts 3', 'arts 3']

Patent US20050258350 - Optoelectronic semiconductor device and method of manufacturing such a device - Google Patents
The invention relates to a semiconductor device (10) comprising a semiconductor element (1), particularly a solid-state image sensor (1), comprising a semiconductor body (11) of which one surface comprises an optically active part (1A) and an optically inactive part (1B) within which electrical connection...http://www.google.com/patents/US20050258350?utm_source=gb-gplus-sharePatent US20050258350 - Optoelectronic semiconductor device and method of manufacturing such a device
Publication number US20050258350 A1
Application number US 10/526,867
PCT number PCT/IB2003/003645
Also published as CN1682376A, CN100550430C, EP1540740A2, US7351951, WO2004023564A2, WO2004023564A3
Publication number 10526867, 526867, PCT/2003/3645, PCT/IB/2003/003645, PCT/IB/2003/03645, PCT/IB/3/003645, PCT/IB/3/03645, PCT/IB2003/003645, PCT/IB2003/03645, PCT/IB2003003645, PCT/IB200303645, PCT/IB3/003645, PCT/IB3/03645, PCT/IB3003645, PCT/IB303645, US 2005/0258350 A1, US 2005/258350 A1, US 20050258350 A1, US 20050258350A1, US 2005258350 A1, US 2005258350A1, US-A1-20050258350, US-A1-2005258350, US2005/0258350A1, US2005/258350A1, US20050258350 A1, US20050258350A1, US2005258350 A1, US2005258350A1
Inventors Anton Van Arendonk
Patent Citations (12), Referenced by (25), Classifications (28), Legal Events (3)
US 20050258350 A1
The invention relates to a semiconductor device (10) comprising a semiconductor element (1), particularly a solid-state image sensor (1), comprising a semiconductor body (11) of which one surface comprises an optically active part (1A) and an optically inactive part (1B) within which electrical connection regions (2) of the optoelectronic semiconductor element (1) are present, while a body (3) is present above the optically active area (1A) of the surface of the semiconductor body (11) comprising an optical component (3B). According to the invention the body (3) comprises an optically transparent foil (3) which is present on the optically active part (1A) of the surface of the semiconductor body (11) and which is attached thereto with an optically transparent adhesive layer (4) and in which the optical component (3B) is formed. The device (10) is very stable, compact and easy to manufacture, that is to say in batches. For example a component (3B) such as a lens (3B) may easily be formed by pressing a suitably formed die (13) into the foil (3). A method according to the invention for manufacturing the device according to the invention is cost-effective and easy.
1. A semiconductor device comprising an optoelectronic semiconductor element comprising a semiconductor body a surface of which has an optically active part and a non-optically active part in which are located electrical connection areas of the optoelectronic semiconductor element, above which optically active part of the surface of the semiconductor body a body is located comprising an optical component, characterized in that the body comprises an optically transparent foil in which the optical component is formed that is located on the optically active part of the surface of the semiconductor body and is connected to it.
2. A semiconductor device as claimed in claim 1, characterized in that the foil is connected to the surface of the semiconductor body by means of an optically transparent adhesive layer.
3. A semiconductor device as claimed in claim 1, characterized in that a further body is attached to the semiconductor body, which further body comprises a further optical component above the active part of the surface of the semiconductor body which further optical component is separated from the foil by a hollow space.
4. A semiconductor device as claimed in claim 3, characterized in that the further body comprises a cylindrical part of which one end is glued to the foil and of which the other end is provided with the further optical component.
5. A semiconductor device as claimed in claim 1, characterized in that the optoelectronic semiconductor element is fixed to an electrically insulating flexible foil of which one side is provided with a conductor pattern, the electrical connection areas are connected to the conductor pattern by means of wire links and the wire links are enveloped in an insulating sheathing.
6. A semiconductor device as claimed in claim, 1, characterized in that the optoelectronic semiconductor element comprises a solid-state image sensor, the component comprises a lens and the further component comprises a lens and/or a filter opaque to infrared radiation.
7. A method of manufacturing a semiconductor device comprising an optoelectronic semiconductor element with a semiconductor body of which one surface has an optically active part and an optically non-active part within which there are electrical connection areas of the optoelectronic semiconductor element, above which optically active part of the surface of the semiconductor body a body is installed comprising an optical component, characterized in that for the body is chosen an optically transparent foil in which the optical component is formed that is installed on the optically active part of the surface of the semiconductor body.
8. A method as claimed in claim 7, characterized in that the optical component is fixed to the surface of the semiconductor body by means of an optically transparent adhesive layer.
9. A method as claimed in claim 7, characterized in that the optical component is formed in the foil by pressing the foil with a profiled die and preferably while at the same time heating is applied.
10. A method as claimed in claim 7, characterized in that a further body that is provided with a further optical component is fixed to the semiconductor body so that the further optical component is located above the optically transparent foil and is separated from it by a hollow space.
11. A method as claimed in claim 10, characterized in that for the further body a cylindrical part is selected of which one end is glued to the foil and of which the other end is provided with the further optical component.
12. A method as claimed in claim 7, characterized in that the optoelectronic semiconductor element is fixed to an electrically insulating flexible foil of which one side is provided with a conductor pattern, the electrical connection areas are connected to the conductor pattern by means of wire links and the wire links are enveloped in an insulating sheathing.
13. A method as claimed in any one of the claims 7, characterized in that a carrier body comprises a number of strip-like or rectangular optically transparent foils which receive the adhesive layer on the side turned away from the carrier body is moved above a wafer that contains a number of semiconductor elements and, after the carrier body with the foils has been aligned relative to the wafer of semiconductor elements, the foils are glued to the semiconductor elements by pressing the carrier body onto the wafer after which the carrier body is removed.
14. A method as claimed in claim 13, characterized in that once the wafer has received the optically transparent foils and once the optical component has been formed therein, a further body that is provided with a further optical component is attached to each of the semiconductor elements in the wafer so that the further component is located above the active part of the surface of the semiconductor element and is separated from the foil by a hollow space.
15. A method as claimed in claim 14, characterized in that the wafer is fixed with a side facing the surface of the semiconductor elements to a membrane that is located inside a ring and is split up into separate semiconductor elements by sawing after the further optical component has been installed.
16. A method as claimed in claim 15, characterized in that individual semiconductor elements are fixed to a strip-like electrically insulating flexible foil of which one side is provided with a conductor pattern, the electrical connections are linked to the conductor pattern by wire links, the wire links are enveloped in a sheathing after which the strip-like flexible foil is split up into parts each one of which comprising a semiconductor element.
17. A method as claimed in one of the claims 13, characterized in that the foils are made by gluing an optically transparent film onto a UV transparent carrier film by means of a glue that can be detached by UV radiation, forming strip-like or rectangular foils in the optically transparent film by cutting by means of a laser beam, after which the redundant parts of the film can be partly pressed out of it or completely removed.
18. A method as claimed in claim 17, characterized in that the carrier body is formed by the UV transparent carrier film and in that this is removed by exposure to UV light after the redundant parts of the film have been removed and after the foils have been fixed to the wafer.
19. A method as claimed in claim 17, characterized in that the carrier body is formed by a plate-like pair of vacuum tweezers with which the UV transparent carrier film provided with foils is picked up after which the UV transparent carrier film is removed by UV exposure, subsequent to which the redundant parts of the film are torn off the carrier body.
For this purpose, a device of the type mentioned in the opening paragraph is characterized according to the invention in that the body comprises an optically transparent foil in which the component is formed that is located on the optically active part of the surface of the semiconductor body and is connected to it. The invention is first and foremost based on the recognition that the fading of the image occurring at lower temperatures is caused by condensation of moist that permeates in the space between the element and the optical component. Condensation of moist—or other vapors caused by output gases—on the active part of the surface of the sensor is avoided by covering this with a foil. Since an optically transparent material is chosen for the foil, the sensitivity to radiation from the optoelectronic semiconductor element such as an image sensor is not affected detrimentally by this. Moisture drops present in the space above the foil and either condensing on the foil or not or also dust particles present there do not substantially have any influence on the optical quality of the image because they are not located in the focus. Since condensation and/or precipitation of moist or impurities on the surface of the sensor is avoided, also the lifetime of the sensor may be extended. Further an important advantage of a device according to the invention is that this device can have an up to 10% larger radiosensitivity because the number of surfaces on which reflection losses may occur is reduced.
The semiconductor element is preferably mounted on an electrically insulating flexible foil one side of which has a conductor pattern, the electrical connection areas are connected to the conductor pattern by means of wire links and the wire links are enveloped in an insulating sheathing. The sheathing-just like the further body—is preferably opaque. This means that, for example, visible light either reflects from it or is absorbed by it.
According to the invention the body 3 comprises an optically transparent foil 3 which is located on the optically active part 1A of the surface of the semiconductor body 11 and is connected thereto by means of a adhesive layer 4 and in which the component 3B is formed. In this example the optical foil 3 comprises polyethene and is 100 μm thick. It can be delivered by for instance 3M company. The foil 3 may also be made of different materials such as polyesters and suitable thicknesses lie between for example 20 and 200 μm. The lateral dimensions are adapted to the dimensions of the optically active part 1A of the element 1 and are in this example 2 mm×1.5 mm. The active part 1A is here about 1.6 mm×1.2 mm, while the whole element measures 1.4 mm×4 mm. The adhesive layer 4 here comprises a so-called PSA (pressure Sensitive Adhesive) also obtainable from 3M by the name of 3M Optical Clear Adhesives, however other suitable adhesives may be used as well. The lens 3B has lateral dimensions that substantially correspond to the dimensions of the active area 1A. The opening of the lens 3B and the focal distance are found for example between 1 and 3 mm.
FIGS. 3 to 9 show the device 10 as shown in FIG. 1 in consecutive stages of manufacturing in a cross-sectional view corresponding to that of FIG. 2 by means of an embodiment of a method according to the invention. A wafer 111 is started from (FIG. 3) which comprises a large number of semiconductor elements 1,1′ as they are manufactured in customary manner and of which only two 1,1′ are represented for simplicity and which comprise optically active areas 1A. A carrier body 14 is moved above it, here a pair of plate-like vacuum tweezers 14 which are connected to a vacuum arrangement—not shown in the drawing—via channels 14A. Against this vacuum arrangement there are the optically transparent foils 3 which are provided with the adhesive layer 4. The foils are aligned relative to the active areas 1A of the wafer 111. The alignment features present on the wafer 111 can then be made use of.
The optical foils 3 are now (see FIG. 4) aligned by the tweezers 14 and pressed onto the wafer 111 and glued to it by the adhesive effect. The vacuum of the tweezers 14 is turned off after which the tweezers 14 are removed. Then (see FIG. 5), with the aid of a—preferably heated—die 13 the lenses 3B are formed in the foil 3 by pressing on the foils 3 with the die 13. This may be effected simultaneously by utilizing a larger number of dies 13 or by translating a single die 13—as in this example—or a small matrix of dies 13 above the surface of the wafer 111.
Then (see FIG. 6) the wafer 111 is installed on a membrane 15 which is located inside a ring 16. This may be effected by placing the wafer 111 upside down on an auxiliary ring—not shown in the drawing—after which the ring 16 is placed around the wafer 111. The membrane 15 is then bonded by a roller to the back of the wafer 111 and the back of the ring 16. Subsequently the further bodies 5 (see FIG. 7) with the lattice 6 are fixed to the foils by bonding with the adhesive layer 19. This step too can be carried out completely or partly sequentially or in parallel.
Then (see FIG. 8) individual semiconductor bodies 11 can be formed with elements 1,1′ from the wafer 111 by sawing through the latter in two mutually perpendicular directions with a sawing machine not shown in the drawing. Finally (see FIG. 9), individual semiconductor elements are picked up from the membrane 15 for example by a tubular pair of vacuum tweezers not shown in the drawing and fixed to an insulating flexible foil 17 having a conductor pattern 8 by means of an adhesive layer 18 which here comprises a glue customary per se—either conductive or not—such as an epotek (like) glue. Wire links 9 and an insulating sheathing 12 are subsequently installed and the foil 17 is cut into pieces which each contain an element 1, resulting in the device 10 shown in FIGS. 1 and 2, which device is ready for use.
FIGS. 10 to 14 show the manufacturing of the foils used during the method of FIGS. 3 to 9 in consecutive stages of this manufacturing and—with the exception of FIG. 12 which shows a plan view—in a cross-sectional view perpendicular to the thickness direction. A carrier film that is transparent to UV radiation and has a thickness of about 100 μm is started from (see FIG. 10). On top of it there is an optically transparent film 33 of the material that is used for the foils 3. The film 33 is stuck to the carrier film by an adhesive layer 21 comprising a glue that can be made soluble by means of UV radiation. The film 33 is cut through by means of a laser beam 22, during which operation the foils 3 are formed and separated from the rest 3A of the film 33 by grooves 34. The wavelength of the laser beam 22 is selected such that it is absorbed in the film 33 indeed, but hardly or not at all in the carrier film 20 or the adhesive layer 21. Cutting through the film 33 is represented in FIG. 12 in plan view and in FIG. 11 in a cross-sectional view along the line XI-XI in FIG. 12.2 which corresponds to a plan view. FIG. 12 shows in a dotted line for clarity the (future) position of the semiconductor wafer 111. The redundant parts 3A of the film 33 can now be torn off the film 20. The film 20 can function as a carrier body 14 in FIG. 3 for providing the foils 3 on the wafer 111 after the foils 3—as is shown in FIG. 3—have been provided with an adhesive layer 4. After the foils 3 have been deposited on the wafer 111, the film 20 is removed after a UV radiation of the adhesive layer 21 through the film 20.
FIG. 15 illustrates a variant of the manufacturing of FIGS. 10 to 14. In a plan view—just like FIG. 12—the Figure shows a variant of the distribution of the film 33 in the foils 3 and the redundant parts 3A. The groove 34 corresponds to the path followed by the laser beam 22. The laser beam 22 can then follow an uninterrupted path. The redundant parts 3A can easily be removed because they are executed coherently. The strips then have a length that substantially corresponds to the diameter of the wafer 111, so that a strip 3 extends over a large number of elements 1 in the wafer 111. The strip 3 is placed in its longitudinal direction corresponding to the longitudinal direction of the strip-like foil 17 in FIG. 1 onto the elements 1. This variant is pre-eminently suitable if the element 1 has only two rows of electrical connection areas 2 facing each other. Both the wafer 111 and the elements 1 therein are shown by dotted lines in this Figure for clarity's sake. During the sawing of the wafer 111, as is shown in FIG. 8, the strip-like foil 3 is then sawn through in the plane of the drawing.
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U.S. Classification 250/239, 257/432, 250/208.1, 257/431, 257/434, 257/E31.127, 257/E31.117, 257/98
International Classification H01L29/22, H01L27/14, H01L27/146, H01L33/00, H01J3/14, H04N5/335, H01J5/02, H04N5/225, H01L31/0232, H01L31/0203
Cooperative Classification H01L31/02325, H01L2924/181, H01L2224/05554, H01L2224/73265, H01L2224/49175, H04N5/2257, H01L31/0203
European Classification H04N5/225M, H01L31/0203, H01L31/0232
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VAN ARENDONK, ANTON PETRUS MARIA;REEL/FRAME:016819/0588