JP4241160B2 - Method for manufacturing solid-state imaging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solid-state imaging device and a manufacturing method thereof, and more particularly to a chip size package (CSP) type solid-state imaging device in which a microlens is integrated on a chip.
[0002]
[Prior art]
Solid-state imaging devices including a CCD (Charge Coupled Device) are increasingly required to be miniaturized due to the necessity of application to mobile phones and digital cameras.
As one of them, a solid-state imaging device in which a microlens is provided in a light receiving area of a semiconductor chip has been proposed. In such a case, for example, by integrally mounting a solid-state imaging device having a microlens in the light-receiving area so as to have an airtight sealing portion between the light-receiving area of the solid-state imaging device and the microlens, There has been proposed a solid-state imaging device that is miniaturized (Japanese Patent Laid-Open No. 7-202152).
[0003]
According to such a configuration, the mounting area can be reduced, and optical components such as a filter, a lens, and a prism can be bonded to the surface of the hermetic sealing portion, and the light collecting ability of the microlens can be improved. It is possible to reduce the mounting size without causing a decrease.
[0004]
[Problems to be solved by the invention]
However, when mounting such a solid-state imaging device, it is necessary to mount the signal on the support substrate on which the solid-state imaging device is mounted and to make electrical connection and sealing by a method such as bonding. There is. As described above, since the number of man-hours is large, there is a problem that a lot of time is required for mounting.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a solid-state imaging device manufacturing method that is easy to manufacture and highly reliable.
It is another object of the present invention to provide a solid-state imaging device that can be easily connected to the main body.
[0005]
[Means for Solving the Problems]
  Therefore, the method of the present invention includes a step of forming a plurality of solid-state imaging elements on the surface of the semiconductor substrate, and a surface on the semiconductor substrate so as to have a gap facing each light receiving region of the solid-state imaging element.Through the spacerCorresponding to the step of joining the translucent member and the solid-state imaging deviceOn the surface of the semiconductor substrateBy the step of forming the external connection terminal and the joining stepThe joined body in which the semiconductor substrate and the translucent member are joined has an external connection terminal.Separating each solid-state image sensor.The spacer is made of a semiconductor material and bonded to the surface of the semiconductor substrate using a thermosetting adhesive or a room temperature curable adhesive that is bonded at an adhesive temperature not exceeding 80 ° C.It is characterized by that.
[0006]
  According to such a configuration, since positioning is performed at the wafer level and integrated by mounting in a lump, and then separated for each solid-state imaging device, a solid-state imaging device that is easy to manufacture and highly reliable can be obtained. It becomes possible to form.
  Further, the bonding step is performed at a temperature not exceeding 80 ° C., so that the occurrence of warping after bonding can be reduced even if the linear expansion coefficients of the respective members are different.
In addition, since the bonding step is a step using a room temperature curable adhesive, bonding can be performed without increasing the bonding temperature, and the occurrence of warpage can be prevented.
[0009]
Preferably, prior to the bonding step, the method includes a step of forming a protrusion by selectively removing the surface of the semiconductor substrate so as to surround the light receiving region, and the light receiving region and the light transmitting property are formed by the protrusion. An air gap is formed between the member and the member.
[0010]
According to such a configuration, it is possible to provide a solid-state imaging device with high workability and high reliability simply by mounting with a protrusion (spacer) formed in advance on the surface of the semiconductor substrate.
[0011]
In the bonding step, a gap is formed between the semiconductor substrate and the translucent member via a spacer disposed so as to surround the light receiving region. .
[0012]
According to such a configuration, it is possible to easily provide a highly reliable solid-state imaging device by simply sandwiching the spacer.
[0013]
Further, in the separating step, the peripheral portion of the translucent member is inward of each peripheral portion of the solid-state image sensor so that the peripheral surface of the semiconductor substrate is exposed from the translucent member. A step of separating the translucent member so as to be positioned.
[0014]
According to such a configuration, the electrode can be easily taken out on the exposed semiconductor substrate surface.
[0022]
Preferably, prior to the dividing step, a step of resin-sealing the periphery of the joint between the translucent member and the semiconductor substrate surface so as to expose the external connection terminal is included.
[0023]
According to this configuration, it is possible to suppress the intrusion of moisture and form a highly reliable solid-state imaging device.
Further, the resin sealing step is performed at a temperature not exceeding 80 ° C.
[0024]
Even with this configuration, bonding is possible without increasing the bonding temperature, and the occurrence of warpage can be reduced.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0026]
(First embodiment)
As shown in the cross-sectional view in FIG. 1A and the enlarged cross-sectional view of the main part in FIG. 1B, the solid-state imaging device has a gap C corresponding to the light receiving region on the surface of the solid-state imaging device substrate 100. The sealing cover glass 200 is formed through the spacer 203S. That is, the surface of the solid-state imaging device substrate 100 including the silicon substrate 101 as the semiconductor substrate on which the solid-state imaging device 102 is formed has a gap C corresponding to the light receiving region of the silicon substrate 101 via the spacer 203S. A glass substrate 201 as a translucent member constituting the sealing cover glass 200 is joined. These are formed on the surface of the silicon substrate 101 at the peripheral edge exposed from the glass substrate 201 after the peripheral edges of the silicon substrate 101 are individually separated by dicing after being bonded at the wafer level so that a plurality of elements are mounted together. Electrical connection with an external circuit (not shown) is achieved through the bonded pad BP. Here, the spacer 203S has a height of 10 to 500 μm, preferably 80 to 120 μm.
[0027]
Here, as shown in FIG. 1B, an enlarged cross-sectional view of the main part of the solid-state image pickup device substrate is a silicon on which a solid-state image pickup device is arranged and an RGB color filter 46 and a microlens 50 are formed. A substrate 101 is used.
[0028]
This solid-state imaging device is formed by forming a channel stopper 28 in a p-well 101b formed on the surface of an n-type silicon substrate 101a, and forming a photodiode 14 and a charge transfer device 33 across the channel stopper. Is. Here, the n-type impurity region 14b is formed in the p + channel region 14a, and the photodiode 14 is formed. In addition, a vertical charge transfer channel 20 made of an n-type impurity region having a depth of about 0.3 μm is formed in the p + channel region 14a, and the gate insulating film 30 made of a silicon oxide film is formed thereon. A vertical charge transfer electrode 32 made of a polycrystalline silicon layer is formed to constitute a charge transfer element 33. A read gate channel 26 formed of a p-type impurity region is formed between the vertical charge transfer channel 20 and the photodiode 14 on the side from which signal charges are read out.
[0029]
The n-type impurity region 14b is exposed along the readout gate channel 26 on the surface of the silicon substrate 101, and the signal charge generated in the photodiode 14 is temporarily accumulated in the n-type impurity region 14b. The data is read out through the read gate channel 26.
[0030]
On the other hand, a channel stopper 28 made of a p + -type impurity region exists between the vertical charge transfer channel 20 and the other photodiodes 14, whereby the photodiodes 14 and the vertical charge transfer channels 20 are electrically separated. In addition, the vertical charge transfer channels 20 are separated from each other so as not to contact each other.
[0031]
Further, the vertical charge transfer electrode 32 is formed so as to cover the readout gate channel 26, expose the n-type impurity region 14b, and expose a part of the channel stopper 28. Signal charges are transferred from the readout gate channel 26 below the electrode to which the readout signal is applied among the vertical charge transfer electrodes 32.
[0032]
The vertical charge transfer electrode 32 and the vertical charge transfer channel 20 constitute a vertical charge transfer device (VCCD) 33 that transfers the signal charge generated at the pn junction of the photodiode 14 in the vertical direction. The surface of the substrate on which the vertical charge transfer electrode 32 is formed is covered with a surface protective film 36, and a light shielding film 38 made of tungsten is formed thereon, and only the light receiving region 40 of the photodiode is opened, and the other regions are shielded from light. Is configured to do.
[0033]
Further, the upper layer of the vertical charge transfer electrode 32 is covered with a planarizing insulating film 43 for planarizing the surface and a translucent resin film 44 formed on the upper layer, and a filter layer 46 is further formed on the upper layer. Yes. In the filter layer 46, a red filter layer 46R, a green filter layer 46G, and a blue filter layer 46B are sequentially arranged so as to form a predetermined pattern corresponding to each photodiode 14.
[0034]
Furthermore, this upper layer is melted after patterning a transparent resin containing a photosensitive resin having a refractive index of 1.3 to 2.0 through the planarization insulating film 48 by an etching method using photolithography, and by surface tension. It is covered with a microlens array made up of microlenses 50 formed by cooling after rolling.
[0035]
Next, the manufacturing process of this solid-state imaging device will be described. As shown in FIGS. 2 (a) to 2 (c) and FIGS. 3 (a) to 3 (c), the manufacturing method is positioned at the wafer level and integrated by mounting in a lump. This is based on the so-called wafer level CSP method in which each solid-state imaging device is separated. This method is characterized by using a sealing glass 200 with a spacer in which a spacer 203S is formed in advance. In addition, although this figure is one unit, the some solid-state image sensor is formed.
[0036]
First, formation of a glass substrate with a spacer will be described.
As shown in FIG. 2A, a silicon substrate 203 serving as a spacer is attached to the surface of a glass substrate 201 via an adhesive layer 202 made of an ultraviolet curable adhesive (cationic polymerizable energy ray curable adhesive). .
[0037]
Then, as shown in FIG. 2B, the silicon substrate 203 is etched by an etching method using photolithography so that a resist pattern is left in a portion to be a spacer, thereby forming a spacer 203S.
[0038]
Thereafter, as shown in FIG. 2 (c), the resist pattern for forming the spacer 203S is left, the resist is filled in the inter-spacer region except for the inter-element region, and the glass substrate is brought to a predetermined depth. By etching, an inter-element groove 204 is formed as shown in FIG. Further, an adhesive layer 207 is formed on the surface of the spacer. Here, since the spacer is formed of a silicon substrate, if etching is performed under such etching conditions that the etching rate of silicon oxide, which is the main component of the glass substrate, is sufficiently larger than the etching rate of silicon, Etching may be performed with the side wall of the spacer exposed in the inter-element region. A dicing blade (grinding stone) may be used when forming the inter-element groove portion 204.
[0039]
Alternatively, photolithography may be performed again to form a resist pattern that includes the entire sidewall of the spacer, and the groove 204 may be formed by etching through the resist pattern. Thus, the sealing cover glass 200 in which the groove portion 204 and the spacer 203S are formed is obtained.
[0040]
Next, a solid-state image sensor substrate is formed. When forming the element substrate, as shown in FIG. 3A, a silicon substrate 101 (in this case, a 6-inch wafer is used) is prepared in advance, and the solid-state imaging element is separated on the surface of the silicon substrate 101. A cutting groove 104 is formed in a region corresponding to the separation line by a method such as etching. Then, using a normal silicon process, a channel stopper layer is formed, a channel region is formed, and element regions such as charge transfer electrodes are formed. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection.
[0041]
Thereafter, as shown in FIG. 3B, alignment is performed by alignment marks formed on the peripheral edge of each substrate, and sealing is performed on the solid-state imaging device substrate 100 in which the element regions are formed as described above. The cover glass 200 is placed and heated, and both are integrated by the adhesive layer 207. This step is preferably performed in a vacuum or in an inert gas atmosphere such as nitrogen gas. In the integration, not only a thermosetting adhesive but also an ultraviolet curable adhesive combined with thermosetting may be used. Further, when the surface of the solid-state imaging device substrate is Si or metal, it can be joined by surface activated room temperature joining without using an adhesive.
[0042]
Thereafter, CMP (chemical mechanical polishing) is performed from the back surface side of the glass substrate, and the back surface side of the glass substrate 201 is removed until the groove portion 204 is reached.
By this step, it becomes possible to separate the glass substrates at the same time as they are thinned.
[0043]
Further, as shown in FIG. 3C, CMP is similarly performed from the back surface side of the silicon substrate 101, and polishing is performed up to the cutting groove 104, thereby separating into individual solid-state imaging devices.
[0044]
In this way, it is easy to manufacture and easy to handle because it is individually separated after being packaged together without performing individual positioning or electrical connection such as wire bonding. .
[0045]
Further, since the groove portion 204 is formed in the glass substrate 201 in advance and is removed from the surface to the depth reaching the groove portion 204 by a method such as CMP after mounting, separation is possible very easily. is there.
[0046]
In addition, the structure in which the edge of the glass substrate 201 is located on the inner side of the edge of the silicon substrate 101 on which the solid-state imaging device is formed and the surface of the silicon substrate 101 is exposed has a recess formed on the inside of the glass substrate in advance. After bonding, the film can be formed with high accuracy by an extremely simple process of removing to this depth by a method such as etch back or CMP. Further, it can be easily formed with good workability. In addition, with the element formation surface sealed in the gap C by bonding, individual solid-state imaging elements can be formed simply by separating or polishing, so there is little damage to the elements and there is a risk of dust contamination. Therefore, it is possible to provide a solid-state imaging device with high reliability.
[0047]
Further, since the silicon substrate is thinned to a depth of about one-half by CMP, the size and thickness can be reduced. Furthermore, since the thickness is reduced after bonding with the glass substrate, it is possible to prevent a decrease in mechanical strength.
[0048]
In addition, since the bonding pads BP on the silicon substrate constituting the solid-state imaging device substrate 100 are exposed from the sealing portion formed by the spacer 203S and the glass substrate 201, the connection to the outside can be easily formed. is there.
[0049]
As described above, according to the configuration of the present invention, since positioning is performed at the wafer level and integrated by mounting in a lump, and then separated for each solid-state imaging device, manufacturing is easy and reliable. It is possible to form a solid-state imaging device having a high height.
[0050]
In the first embodiment, the wiring layer including the bonding pad is a gold layer. However, the wiring layer is not limited to the gold layer, and may be another metal such as aluminum or another conductor layer such as silicide. Needless to say.
The microlens array can also be formed by forming a transparent resin film on the surface of the substrate and forming a lens layer having a refractive index gradient at a predetermined depth by ion transfer from the surface.
[0051]
In addition to the silicon substrate, 42 alloy, metal, glass, photosensitive polyimide, polycarbonate resin, and the like can be appropriately selected as the spacer.
Furthermore, when the linear expansion coefficients of the solid-state imaging device substrate, the spacer, and the glass substrate are different, warpage may occur after bonding. In order to prevent this warpage and to be within the allowable range even if warpage occurs, the bonding temperature when bonding is set to room temperature or a range of 20 ° C. to 80 ° C. Adhesives used here are epoxy, oxetane, silicon, and acrylic adhesives, UV curable adhesives, and visible light curable adhesives, and can obtain desired adhesive strength. It is desirable that the adhesive layer be thin so that moisture can be prevented from entering and high reliability can be obtained. In the first embodiment, the occurrence of warpage when the bonding temperature was changed was measured. In the experiment, the bonding temperature was changed to 20 ° C., 25 ° C., 50 ° C., 80 ° C., and 100 ° C., and in each case, the occurrence of warpage when bonded using a room temperature curable adhesive and a thermosetting adhesive Was observed. The experiment was conducted on the adhesion between the glass substrate and the spacer and between the spacer and the solid-state imaging device substrate.
From this experimental result, the state of warpage is the same regardless of whether a room temperature curable adhesive or a thermosetting adhesive is used, and when the adhesive temperature is 20 ° C. or 25 ° C., almost no warpage occurs. I did not. Further, when the bonding temperature is 50 ° C., the warpage may occur, but when the bonding temperature is 80 ° C., there is often a warpage within the allowable range. On the other hand, when the temperature is 100 ° C., the warpage becomes large and sometimes exceeds the allowable range.
This experimental result also shows that it is desirable that the bonding temperature does not exceed 80 ° C.
In addition, when a photo-curing adhesive is used, since the bonding temperature does not exceed 50 ° C., it is possible to obtain a good bonding state without warping.
[0052]
(Second Embodiment)
Next, a second embodiment of the present invention will be described.
In the first embodiment, the cutting groove 104 is formed in advance in the silicon substrate 101 constituting the solid-state image pickup device substrate 100, and the solid-state image pickup device substrate is sealed with the spacer made of the same silicon as the solid-state image pickup device substrate. The silicon substrate 101 is separated while being thinned by performing CMP until it joins the stop cover glass and reaching the cutting groove 104 from the back side, but in this embodiment, the silicon substrate 101 is cut into the cutting groove. It is characterized in that it is separated without forming the film, leaving the thickness as it is. Other parts are formed in the same manner as in the first embodiment.
[0053]
That is, this joining and separation process is shown in FIGS. As shown in FIG. 4A, using a silicon substrate 101 as a starting material, a channel stopper layer is formed, a channel region is formed, and an element region 102 such as a charge transfer electrode is formed using a normal silicon process. To do. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection.
[0054]
Thereafter, as shown in FIG. 4B, alignment is performed by alignment marks formed on the peripheral edge of each substrate, and the sealing cover glass 200 is formed on the solid-state imaging device substrate 100 formed as described above. Are integrated by the adhesive layer 207 by heating. At this time, since the cutting groove is not formed in the silicon substrate 101, the mechanical strength is high.
[0055]
Thereafter, as shown in FIG. 4C, as in the first embodiment, CMP (chemical mechanical polishing) is performed from the rear surface side of the glass substrate, and the rear surface side of the glass substrate 201 is moved to the groove portion 204. Remove until you reach.
[0056]
By this step, it becomes possible to separate the glass substrates at the same time as they are thinned.
Further, as shown in FIG. 4D, the glass substrate 201 is cut with a diamond blade (grinding stone) and separated into individual solid-state imaging devices.
[0057]
According to this method, it is possible to form a highly reliable device that is thicker than the solid-state imaging device obtained in the first embodiment.
[0058]
(Third embodiment)
Next, a third embodiment of the present invention will be described.
In the first embodiment, the cutting groove 104 is formed in advance on the silicon substrate 101 constituting the solid-state imaging device substrate 100, and CMP is performed from the back surface side until reaching the cutting groove 104 after bonding. Although the silicon substrate 101 is separated while being thinned, in this embodiment, a dummy plate 301 made of a silicon substrate having a thickness of 50 to 700 μm is attached to the back surface side of the silicon substrate 101 with an adhesive layer 302 interposed therebetween. In this case, a cutting groove 304 having a depth reaching the dummy plate 301 is formed after the attachment.
[0059]
Therefore, in the separation step, the adhesive layer 302 may be softened to eliminate the stickiness, and the dummy plate 301 may be removed.
Other parts are formed in the same manner as in the first embodiment.
That is, this joining and separation process is shown in FIGS. Using the silicon substrate 101 as a starting material, a channel stopper layer is formed, a channel region is formed, and device regions such as charge transfer electrodes are formed using a normal silicon process. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection. Thereafter, as shown in FIG. 5A, a dummy plate 301 made of a silicon substrate is attached to the back side of the silicon substrate 101 with an adhesive layer 302 interposed therebetween.
[0060]
Thereafter, as shown in FIG. 5B, a cutting groove 304 is formed from the element forming surface side of the silicon substrate 101 using a diamond blade (grinding stone).
And as shown in FIG.5 (c), it aligned by the alignment mark (not shown) formed in the peripheral part of the solid-state image sensor substrate 100 and the cover glass 200 for sealing, and formed as mentioned above. The sealing cover glass 200 is placed on the solid-state imaging device substrate 100, and both are integrated by the adhesive layer 207 by heating. Here, the glass substrate is provided with the spacer 203S and the adhesive layer 207 formed in the steps of FIGS. At this time, the cutting groove 304 is formed so as to penetrate the silicon substrate 101, but since it is fixed by the dummy plate 301, the mechanical strength is high.
[0061]
Thereafter, as shown in FIG. 5D, as in the first embodiment, CMP (chemical mechanical polishing) is performed from the back surface side of the glass substrate, and the back surface side of the glass substrate 201 is moved to the groove portion 204. Remove until you reach.
By this step, it becomes possible to separate the glass substrates at the same time as they are thinned.
[0062]
Further, as shown in FIG. 5E, the adhesive layer 302 on the back surface of the silicon substrate 101 is softened, and the dummy plate 301 is removed to separate the individual solid-state imaging devices. Here, it is desirable to select a material having a softening point lower than that of the adhesive layer 202 for bonding the spacer to the glass substrate 201 for the adhesive layer 302.
[0063]
According to this method, since the solid-state image pickup device substrate 100 is diced on the dummy plate 301 prior to bonding, it is applied after bonding as compared with the solid-state imaging device obtained in the first embodiment. Less stress is required and manufacturing yield is improved. In addition, it is possible to improve the reliability of the solid-state imaging device.
[0064]
In the above embodiment, the glass substrate and the spacer may be bonded using an adhesive layer, but anodic bonding or surface activated room temperature bonding is also applicable. According to anodic bonding, it is possible to easily obtain strong bonding.
[0065]
In the first to third embodiments, CMP is used for thinning the glass substrate, but a grinding method, a polishing method, an etching method, or the like is also applicable.
[0066]
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
In the first embodiment, the groove portion 204 is formed in advance in a region corresponding to the inter-element region of the glass substrate 201 constituting the sealing cover glass 200, and the solid-state imaging device substrate and the glass substrate are formed. After bonding, CMP is performed from the back side of the glass substrate 201 to separate the individual elements. However, in this embodiment, a glass substrate that does not form a recess is bonded, and dicing or laser is used at the time of separation. The periphery of the cutting line is evaporated, and the edge of the glass substrate 201 of each solid-state image sensor is adjusted so as to be inside the edge of the silicon substrate 101 constituting the solid-state image sensor substrate 100. is there. Other parts are formed in the same manner as in the first embodiment.
[0067]
That is, in this method, the processing of the glass substrate is finished when the spacer is formed as shown in FIG. 2B, and the glass substrate in which the spacer 203S is bonded to the flat glass substrate 201 is used as a starting material. .
[0068]
Then, as shown in FIG. 6A, a silicon substrate 101 (in this case, a 6-inch wafer is used) is prepared in advance, and the surface of the silicon substrate 101 corresponds to a separation line for separating each solid-state imaging device. A cutting groove 104 is formed in a region to be etched by a method such as etching. Then, by using a normal silicon process, a channel stopper layer is formed, a channel region is formed, and an element region 102 such as a charge transfer electrode is formed. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection.
[0069]
Thereafter, as shown in FIG. 6B, alignment is performed by alignment marks formed on the peripheral edge of each substrate, and the sealing cover glass 200 is formed on the solid-state imaging device substrate 100 formed as described above. Are integrated by the adhesive layer 207 by heating.
[0070]
Thereafter, as shown in FIG. 6C, the periphery of the cutting line is evaporated from the back side of the glass substrate by dicing or laser, and the edge of the glass substrate 201 of each solid-state image sensor constitutes the solid-state image sensor substrate 100. To be separated from the edge of the silicon substrate 101.
[0071]
Further, as shown in FIG. 6D, CMP is similarly performed from the back surface side of the silicon substrate 101, and polishing is performed up to the cutting groove 104 to separate the individual solid-state imaging devices. Further, this step is not limited to CMP, and grinding, polishing, etching, or the like may be used.
[0072]
In this way, since they are separated after being packaged together, they are easy to manufacture and easy to handle.
[0073]
Further, since the edge portion is removed by dicing or laser evaporation without forming the groove portion 204 in advance on the glass substrate 201, separation is possible very easily.
[0074]
As described above, the structure in which the edge of the glass substrate 201 is located inside the edge of the silicon substrate 101 on which the CCD is mounted and the surface of the silicon substrate 101 is exposed is a simple process of evaporating with dicing or laser. It can be formed with high accuracy.
[0075]
In addition, since the glass substrate maintains the same thickness until the separation step, warpage and distortion can be reduced.
[0076]
(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.
In the fourth embodiment, the cutting groove 104 is formed in advance on the silicon substrate 101 constituting the solid-state imaging device substrate 100, and after bonding, CMP is performed until the cutting groove 104 is reached from the back surface side. Although the silicon substrate 101 is separated while being thinned, the present embodiment is characterized in that the silicon substrate 101 is separated without forming a cutting groove and remains as it is. Further, as in the fourth embodiment, the glass substrate 201 is bonded without forming the groove portion 204, and the edge portion is evaporated at the time of separation. Other parts are formed in the same manner as in the first embodiment.
[0077]
That is, this joining and separation process is shown in FIGS. As shown in FIG. 7A, using a silicon substrate 101 as a starting material, a channel stopper layer is formed, a channel region is formed, and an element region 102 such as a charge transfer electrode is formed using a normal silicon process. To do. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection.
Thereafter, as shown in FIG. 7B, alignment is performed with alignment marks formed on the peripheral edge of each substrate, and the sealing cover glass 200 is formed on the solid-state imaging device substrate 100 formed as described above. Are integrated by the adhesive layer 207 by heating. At this time, since neither the cutting groove nor the recess is formed in both the silicon substrate 101 and the glass substrate 201, the mechanical strength is high.
[0078]
Thereafter, as shown in FIG. 7C, as in the fourth embodiment, the periphery of the cutting line is evaporated from the back surface side of the glass substrate by dicing or laser, and the glass substrate 201 of each solid-state imaging device. Are adjusted and separated so that the edge of the substrate is located inside the edge of the silicon substrate 101 constituting the solid-state imaging device substrate 100.
[0079]
And finally, as shown in FIG.7 (d), it cut | disconnects with a diamond blade (grinding stone) from the glass substrate 201 side, and isolate | separates into each solid-state imaging device.
According to this method, it is possible to form a highly reliable device that is thicker than the solid-state imaging device obtained in the first embodiment.
[0080]
(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described.
In the fourth embodiment, the cutting groove 104 is formed in advance in the silicon substrate 101 constituting the solid-state imaging device substrate 100, and separation is performed by performing CMP from the back surface side. Further, in the fifth embodiment, the silicon substrate 101 constituting the solid-state imaging device substrate 100 is formed in advance without forming the cutting groove 104, and after joining, it is cut with a diamond blade (grinding stone), The silicon substrate 101 is separated. In the present embodiment, an adhesive layer 302 is provided on the back side of the silicon substrate 101 so that the silicon substrate 101 does not have to be separated after the sealing cover glass 200 and the solid-state imaging device substrate 100 are bonded together. A dummy plate 301 made of a silicon substrate having a thickness of 50 to 700 μm is pasted, and after the pasting, a cutting groove 304 having a depth reaching the dummy plate 301 is formed. .
[0081]
Therefore, in the separation step, the adhesive layer 302 can be softened and the dummy plate 301 can be removed.
Other parts are formed in the same manner as in the fourth and fifth embodiments.
[0082]
That is, this joining and separation process is shown in FIGS. Using the silicon substrate 101 as a starting material, a channel stopper layer is formed, a channel region is formed, and an element region 102 such as a charge transfer electrode is formed using a normal silicon process. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection. Then, as shown in FIG. 8A, a dummy plate 301 made of a silicon plate having a plate thickness of 50 to 700 μm is attached to the back side of the silicon substrate 101 with an adhesive layer 302 interposed therebetween.
[0083]
Thereafter, as shown in FIG. 8B, a cutting groove 304 is formed from the element forming surface side of the silicon substrate 101 using a diamond blade (grinding stone).
And as shown in FIG.8 (c), it aligned by the alignment mark (not shown) formed in the peripheral part of the solid-state image sensor substrate 100 and the sealing cover glass 200, and formed as mentioned above. The sealing cover glass 200 is placed on the solid-state imaging device substrate 100, and both are integrated by the adhesive layer 207 by heating. Here, the glass substrate 201 as the sealing cover glass 200 is obtained by patterning a silicon substrate formed on the glass substrate 201 in the same manner as in the steps of FIGS. 2A to 2C to form the spacer 203S. Used. The adhesive layer 207 is formed on the end surface of the spacer 203S. At this time, the cutting groove 304 is formed so as to penetrate the silicon substrate 101, but since it is fixed by the dummy plate 301, the mechanical strength is high.
[0084]
Thereafter, as shown in FIG. 8D, as in the fourth embodiment, the periphery of the cutting line is evaporated from the back surface side of the glass substrate by dicing or laser, and the glass substrate of each solid-state imaging device. It is adjusted and separated so that the edge of 201 comes to the inside of the edge of the silicon substrate 101 constituting the solid-state imaging device substrate 100.
[0085]
Further, as shown in FIG. 8E, the adhesive layer 302 on the back surface of the silicon substrate 101 is softened, and the dummy plate 301 is removed to separate the individual solid-state imaging devices. Here, it is desirable to select a material having a softening point lower than that of the adhesive layer 202 for bonding the spacer to the glass substrate 201 for the adhesive layer 302.
[0086]
According to this method, since the solid-state image pickup device substrate 100 is diced on the dummy plate 301 prior to bonding, it is applied after bonding as compared with the solid-state imaging device obtained in the first embodiment. Less stress is required and manufacturing yield is improved. In addition, it is possible to improve the reliability of the solid-state imaging device.
In the fourth to sixth embodiments, the glass substrate may be cut by scribing or etching.
[0087]
(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described.
In the sixth embodiment, a dummy plate 301 made of a silicon substrate having a thickness of 50 to 700 μm is pasted on the back side of the silicon substrate 101 via an adhesive layer 302, and after the pasting, A cutting groove 304 having a depth reaching the dummy plate 301 is formed, and after bonding to the glass substrate 201, the adhesive layer 302 is softened in the step of separating into individual solid-state imaging elements. In this embodiment, the dummy plate 301 is separated from the glass substrate 201 with a thickness of 50 to 700 μm via the adhesive layer 402 on the back side. A dummy plate 401 is attached, and after the attachment, a recess 404 having a depth reaching the dummy plate 401 is formed. Then, in the step of separating into individual solid-state imaging elements after bonding to the glass substrate 201, the adhesive layer 402 is softened and the dummy plate 401 is removed to separate the elements. Other parts are formed in the same manner as in the sixth embodiment.
[0088]
As for the silicon substrate 101 constituting the solid-state imaging device substrate 100, a silicon substrate in which no cutting groove or dummy plate is formed in advance is used in the same manner as in the second and fourth embodiments, and finally a diamond blade (grinding stone) ).
[0089]
That is, this joining and separation process is shown in FIGS.
First, as shown in FIG. 9A, a dummy plate 401 made of a glass substrate having a thickness of 50 to 700 μm is pasted on the back side of the glass substrate 201 via an adhesive layer 402, After the bonding, a silicon substrate 203 is further bonded through the adhesive layer 202, and the silicon substrate 203 is subjected to photolithography in the same manner as in the first embodiment described with reference to FIGS. The spacer 203S is formed by the etching method used.
[0090]
Thereafter, as shown in FIG. 9B, as in the first embodiment, a region corresponding to the space between the solid-state imaging elements is selectively etched again, and the depth of the dummy plate 401 is reached. A recess 404 is formed. Further, it may be formed by half dicing.
Further, using the silicon substrate 101 as a starting material, a channel stopper layer is formed and a channel region is formed by using a normal silicon process, and an element region 102 such as a charge transfer electrode is formed. A wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection. And as shown in FIG.9 (c), it aligns with the solid-state image sensor board | substrate 100 formed in this way, and the alignment mark (not shown) formed in the peripheral part of the sealing cover glass 200, The sealing cover glass 200 with the dummy plate 401 is placed on the solid-state imaging device substrate 100 formed as described above, and both are integrated by the adhesive layer 207 by heating.
[0091]
Thereafter, as shown in FIG. 9D, the glass substrate 201 is separated by heating and softening the adhesive layer 402 to remove the dummy plate 401.
[0092]
Further, as shown in FIG. 9E, the solid-state imaging device substrate formed of the silicon substrate 101 is cut using a diamond blade (grinding stone) and separated into individual solid-state imaging devices.
[0093]
According to this method, the glass substrate 201 constituting the sealing cover glass 200 is separated by dicing or etching in advance on the dummy plate 401 prior to bonding, so the first embodiment. Compared with the glass substrate obtained by the above, less stress is applied after bonding, and the manufacturing yield is improved. In addition, it is possible to improve the reliability of the solid-state imaging device.
[0094]
(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described.
In the seventh embodiment, the silicon substrate 101 constituting the solid-state imaging device substrate 100 is bonded as it is without forming the cutting groove 104 in advance, and finally cut with a diamond blade (grinding stone). In the embodiment, a cutting groove 104 is formed in advance in a silicon substrate 101 constituting the solid-state imaging device substrate 100, and after bonding, CMP is performed from the back surface side until the cutting groove 104 is reached, thereby the silicon substrate 101. It is characterized in that it is separated while thinning. Other parts are formed in the same manner as in the seventh embodiment.
[0095]
That is, this joining and separation process is shown in FIGS. As shown in FIG. 10A, a silicon substrate 101 formed with a cut groove 104 is used as a starting material, and a channel stopper layer is formed and a channel region is formed by using a normal silicon process. The element region 102 is formed. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection.
[0096]
Thereafter, as shown in FIG. 10B, alignment is performed using alignment marks formed on the peripheral edge of each substrate, and the substrate is formed on the solid-state imaging device substrate 100 as in the seventh embodiment. The sealing cover glass 200 with the dummy substrate 401 is placed, and the two are integrated by normal temperature direct bonding. Here, the adhesive layer is formed by direct bonding without using the adhesive layer, but may be bonded by the adhesive layer 207.
[0097]
Thereafter, as shown in FIG. 10C, CMP (chemical mechanical polishing) is performed from the back surface side of the solid-state imaging device substrate 100, and the back surface side of the silicon substrate 101 is removed until it reaches the cutting groove 104.
[0098]
By this step, the solid-state image pickup device substrate can be individually separated simultaneously with the thinning. Here, instead of CMP, grinding, polishing, etching, or the like may be used.
[0099]
Thereafter, as shown in FIG. 10D, heating is performed to soften the adhesive layer 402, and the dummy substrate 401 is removed. By this step, it is easily separated and a solid-state imaging device is formed.
[0100]
(Ninth embodiment)
Next, a ninth embodiment of the present invention will be described.
In the seventh embodiment, the silicon substrate 101 constituting the solid-state imaging device substrate 100 is bonded as it is without forming the cutting groove 104 in advance, and finally cut with a diamond blade (grinding stone). In the embodiment, a dummy plate is formed in advance on both the silicon substrate 101 constituting the solid-state imaging device substrate 100 and the glass substrate 201 constituting the sealing cover glass 200, and the cutting groove 104 and the groove portion 204 are formed in advance prior to bonding. In addition, after bonding, the adhesive layers 402 and 302 are softened and the dummy plates 301 and 401 are removed to separate them. Other parts are formed in the same manner as in the seventh embodiment.
[0101]
That is, this joining and separation process is shown in FIGS. As shown in FIG. 11A, a silicon substrate 101 with a dummy plate 301 attached is used as a starting material, and a channel stopper layer is formed, a channel region is formed using a normal silicon process, and a charge transfer electrode is formed. .. The element region 102 is formed. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection.
[0102]
Thereafter, as shown in FIG. 11B, a cutting groove 304 is formed so as to reach the dummy plate 301.
Further, the sealing cover glass 200 is also attached with the dummy plate 401 in the same manner as in the seventh and eighth embodiments, and the recess 404 is formed by etching or dicing.
Then, as shown in FIG. 11 (c), alignment is performed using alignment marks formed on the peripheral edge of each substrate, and on the solid-state imaging device substrate 100 with the dummy substrate 301, as in the seventh embodiment. The sealing cover glass 200 with the dummy substrate 401 thus formed is placed and heated, and both are integrated by the adhesive layer 207.
[0103]
Thereafter, as shown in FIG. 11D, the adhesive layers 402 and 203 are softened, the dummy plates 301 and 401 are removed, and separation into individual solid-state imaging elements is possible.
Note that these adhesive layers 302 and 402 may have the same softening temperature and may be simultaneously softened.
Alternatively, after softening and removing one, it may be fixed by taping, and the other one may be softened and removed.
According to such a configuration, since no extra stress is applied after joining, damage to the solid-state imaging device can be reduced.
[0104]
(Tenth embodiment)
Next, a tenth embodiment of the present invention will be described.
In the first to ninth embodiments, as shown in FIGS. 2A and 2B, an adhesive is applied to the glass substrate 201 when forming the sealing cover glass 200 on which the spacer 203S is formed. The silicon substrate 203 to be a spacer is attached to the silicon substrate 203, and the silicon substrate 203 is patterned by an etching method using photolithography and the cutting groove 204 is formed. In the present embodiment, FIG. As shown in FIG. 5B, the dummy plate 501 is used to etch the spacer 203S on the dummy plate, and thereafter, the dummy plate 501 is bonded to the glass substrate 201 via the adhesive layer 202. Other portions are formed in the same manner as in the above embodiment.
[0105]
That is, as shown in FIG. 12A, a silicon substrate 203 serving as a spacer is bonded to a dummy plate 501 made of a silicon substrate via an adhesive layer 502 having a softening temperature of about 50 to 150 ° C. Then, this silicon substrate 203 is patterned by an etching method using photolithography to form a spacer 203S. Then, as shown in FIG.12 (b), the glass substrate 201 is stuck to the spacer 203S side through the adhesive bond layer 202 with a softening temperature of about 100-200 degreeC.
[0106]
After sticking the glass substrate 201 in this way, the adhesive layer 502 is softened by heating to a temperature (about 50 to 150 ° C.) at which the adhesive layer 502 softens without the adhesive layer 202 softening. The dummy plate 501 is removed, and the sealing cover glass 200 with a spacer is formed.
[0107]
According to this method, since it is not necessary to process the spacer on the glass substrate, it is possible to prevent the glass substrate 201 from being scratched and causing clouding. The adhesive layer 502 to which the dummy plate is attached only needs to be able to withstand the baking temperature in the photolithography process. Since the dummy plate 501 needs to be removed, the adhesive layer 202 for attaching the spacer 203S to the glass substrate 201 needs to have a sufficiently higher softening temperature than the adhesive layer 502.
[0108]
Further, when it is necessary to form a recess in the glass plate, the groove 204 may be formed by dicing or etching prior to sticking as shown in FIG. Further, after removing the dummy plate 501, the uneven portion may be formed by dicing or etching.
[0109]
The joining step and the cutting step are the same as those shown in FIGS. 3 to 5 described in the first to third embodiments.
[0110]
(Eleventh embodiment)
Next, an eleventh embodiment of the present invention will be described.
In the first to tenth embodiments, the spacer 203S is formed separately and attached via an adhesive layer, but in this embodiment, the glass substrate 201 is formed by an etching method using photolithography. The spacer 206 is formed by forming the recess 205. Other portions are formed in the same manner as in the above embodiment.
[0111]
That is, as shown in FIG. 14A, a glass substrate 201 is prepared.
And as shown in FIG.14 (b), the glass substrate provided with the spacer 206 is formed by forming the recessed part 205 with the etching method using photolithography.
[0112]
According to such a configuration, since the spacer 206 is integrally formed, the manufacturing is easy and there is no positional deviation, and there is no possibility that distortion occurs at the joint.
[0113]
(Twelfth embodiment)
Next, a twelfth embodiment of the present invention will be described.
In the eleventh embodiment, the method of forming the sealing cover glass 200 in which the spacer 206 is integrally formed has been described. However, as shown in FIGS. 15A to 15C, the groove 204 is also etched. It is also possible to form with.
[0114]
In this embodiment mode, the spacer 206 is formed integrally with the glass substrate 201 by forming the recess 205 by an etching method using photolithography. Then, by forming the groove portion 204, the groove portion 204 of the glass substrate is formed by etching so that the edge of the sealing cover glass 200 comes to the inner side than the edge of the solid-state imaging device substrate 100. Therefore, the generation of distortion is reduced and the separation process is facilitated.
That is, as shown in FIG. 15A, a glass substrate 201 is prepared.
Then, as shown in FIG. 15B, a recess 205 is formed in the glass substrate 201 by an etching method using photolithography.
[0115]
Thereafter, as shown in FIG. 15C, further etching is performed deeper by an etching method using photolithography to form the groove portion 204, and the spacer 206 is integrally formed.
These processing steps require two etchings because of different etching depths. However, a resist pattern to be a mask is formed in a two-layer structure, and after etching the groove 204 for spacer formation, an upper resist layer is formed. Only the pattern may be selectively removed, and etching may be performed using only the resist pattern on the lower layer side as a mask.
[0116]
Further, the joining and separating steps are the same as those shown in FIGS. 3 to 5 described in the first to third embodiments.
[0117]
(Thirteenth embodiment)
Next, a thirteenth embodiment of the present invention will be described.
In the eleventh and twelfth embodiments, the method of forming the sealing cover glass 200 with the spacer 206 integrally formed has been described. However, as shown in FIGS. 16A to 16D, the groove 204 is formed. Alternatively, a spacer silicon substrate 203 may be attached to the glass substrate 201, and the spacer 203S may be formed by selectively removing the silicon substrate 203 by an etching method using photolithography. Other portions are formed in the same manner as the above-described embodiments of 11 and 12.
[0118]
In the present embodiment, the groove 204 is formed on the glass substrate 201 by an etching method using photolithography, the spacer 206 is integrally formed, and the edge of the sealing cover glass 200 is more than the edge of the solid-state imaging device substrate 100. A groove 204 of the glass substrate is formed by etching so as to be on the inside. Therefore, the generation of distortion is reduced and the separation process is facilitated.
[0119]
That is, as shown in FIG. 16A, a glass substrate 201 is prepared.
Then, as shown in FIG. 16B, a groove 204 is formed in the glass substrate 201 by an etching method using a photolithography method.
Thereafter, as shown in FIG. 16C, a silicon substrate 203 as a spacer substrate is bonded via an adhesive layer 202.
Further, as shown in FIG. 16D, a spacer 203S is integrally formed by an etching method using photolithography.
[0120]
Also by this method, it is possible to form the sealing cover glass 200 with a highly accurate and reliable spacer.
The joining and separating steps are the same as the steps shown in FIGS. 3 to 5 described in the first to third embodiments.
[0121]
(Fourteenth embodiment)
Next, a fourteenth embodiment of the present invention will be described.
In the thirteenth embodiment, as shown in FIGS. 16A to 16D, a silicon substrate 203 serving as a spacer is attached to a glass substrate 201 via an adhesive, and etching using photolithography is performed. The silicon substrate 203 is patterned by the method to form the sealing cover glass 200. In this embodiment, as shown in FIGS. 17A and 17B, a dummy plate 501 is used to form a dummy plate. The spacer 203S is patterned above, and thereafter, the spacer 203S is adhered to the glass substrate 201 on which the groove portion 204 is formed via the adhesive layer 202. Other portions are formed in the same manner as in the thirteenth embodiment.
[0122]
That is, the silicon substrate 203 serving as a spacer is attached to the dummy plate 501 made of a silicon substrate via the adhesive layer 502 having a softening temperature of about 50 to 150 ° C. Then, as shown in FIG. 17A, the silicon substrate 203 is patterned by an etching method using photolithography to form a spacer 203.
[0123]
Thereafter, as shown in FIG. 17B, a glass substrate 201 having a groove 204 is attached to the spacer 203S side through an adhesive layer 202 having a softening temperature of about 100 to 200 ° C.
After the glass substrate 201 is attached in this manner, the dummy layer 501 is removed by heating to about 50 to 150 ° C. within a range where the adhesive layer 202 is not softened, and the dummy plate 501 is removed, as shown in FIG. As shown in FIG. 3, a sealing cover glass 200 with a spacer is formed.
[0124]
According to this method, since it is not necessary to process the spacer on the glass substrate, it is possible to prevent the glass substrate 201 from being scratched and causing clouding.
[0125]
The joining and separating steps are the same as those shown in FIGS. 3 to 5 described in the first to third embodiments.
[0126]
(Fifteenth embodiment)
Next, a fifteenth embodiment of the present invention will be described.
In the twelfth to fourteenth embodiments, the manufacturing process of the sealing cover glass 200 with the spacer provided with the groove portion 204 for facilitating the separation process has been described. However, the fifteenth to seventeenth embodiments are described. Then, by sticking to the dummy plate 401 and forming the groove portion 204, the glass substrate itself is separated in advance prior to bonding, and after bonding, the dummy plate is removed by softening the adhesive layer 402. However, it is characterized by being separated into individual solid-state imaging devices. Other portions are formed in the same manner as in the fourteenth embodiment.
[0127]
In this embodiment, in the embodiment shown in FIGS. 15A to 15C, the groove 204 is formed in the glass substrate of the spacer-integrated sealing cover glass so that the glass substrate can be easily separated. However, as shown in FIG. 18, a dummy plate 401 made of a glass substrate is used via an adhesive layer 402 so that the dummy plate can be easily separated by removing the dummy plate.
[0128]
A glass plate is used as a starting material, and after attaching the dummy plate, the groove 204 and the spacer 206 are formed by an etching method using photolithography.
[0129]
According to this configuration, it is only necessary to soften the adhesive layer 402 by heating at the time of division, and the division can be performed very easily.
[0130]
The joining and separating steps are the same as those described in the seventh to ninth embodiments.
[0131]
(Sixteenth embodiment)
Next, a sixteenth embodiment of the present invention will be described.
In the present embodiment, the glass substrate 201 of the type in which the spacer 203S is adhered to the glass plate with the recesses described in the thirteenth embodiment is adhered to the dummy plate 401 and the groove portion 204 is formed. The glass substrate itself is separated prior to bonding, and after bonding, the adhesive layer 402 is softened to remove the dummy plate and separate into individual solid-state imaging elements. Other portions are formed in the same manner as in the thirteenth embodiment.
[0132]
In this embodiment, the spacer-integrated glass substrate of the embodiment shown in FIGS. 16A to 16B is provided with a dummy plate via an adhesive layer 402 as shown in FIGS. 401 is attached to form a groove 204.
A glass plate is used as a starting material. After the dummy plate is pasted, the groove 204 having a depth reaching the dummy plate and the spacer 203S are formed in the same manner as in the thirteenth embodiment.
[0133]
That is, as shown in FIG. 19A, the dummy substrate 401 is attached to the glass substrate 201 via the adhesive layer 402.
[0134]
After that, as shown in FIG. 19B, the glass substrate 201 is etched using photolithography to form a groove that reaches the dummy substrate 401 from the surface of the glass substrate 201.
[0135]
Then, as shown in FIG. 19 (c), a silicon substrate 203 for spacers is stuck through the adhesive layer 202.
[0136]
Then, as shown in FIG. 19D, the silicon substrate 203 is selectively removed by an etching method using photolithography to form a spacer 203S.
[0137]
According to such a configuration, it is only necessary to soften the adhesive layer 402 by heating at the time of dicing after bonding to the solid-state image pickup device substrate 100, and it can be divided very easily.
[0138]
The joining and separating steps are the same as those described in the seventh to ninth embodiments.
[0139]
(Seventeenth embodiment)
Next, a seventeenth embodiment of the present invention will be described.
In the present embodiment, the spacer 203S patterned on the dummy plate 501 is replaced with the glass substrate 201 of the type in which the spacer 203S is adhered to the glass plate with recesses described in the fourteenth embodiment (FIG. 17). By sticking to 401 and forming the groove portion 204, the glass substrate itself is separated in advance prior to joining, and after joining, the adhesive layer 402 is softened to remove the dummy plate and remove individual solids. It is characterized by being separated into an image sensor. Other portions are formed in the same manner as in the fourteenth embodiment.
[0140]
In this embodiment, as shown in FIGS. 20A to 20C, an adhesive layer 402 is provided on the spacer-attached glass substrate of the embodiment shown in FIGS. A dummy plate 401 is attached.
A glass plate is used as a starting material. After the dummy plate is pasted, the groove 204 having a depth reaching the dummy plate and the spacer 203S are formed in the same manner as in the fifteenth embodiment.
That is, after a silicon substrate 203 serving as a spacer is attached to a dummy plate 501 made of a silicon substrate via an adhesive layer 502, photolithography is applied to the silicon substrate 203 as shown in FIG. The spacer 203S is formed by performing patterning by the etching method.
[0141]
Thereafter, as shown in FIG. 20B, a glass substrate 201 having a groove 204 formed so as to reach the dummy plate 401 is attached to the spacer 203S side through the adhesive layer 202.
After sticking the glass substrate 201 in this way, the adhesive layer 502 is softened and the dummy plate 501 is removed to form a sealing cover glass 200 with spacers as shown in FIG. The
According to such a configuration, the dummy plate 401 can be easily removed simply by softening the adhesive layer 402 by heating at the time of division, and can be divided very easily.
[0142]
The joining and separating steps are the same as those described in the seventh to ninth embodiments.
[0143]
(Eighteenth embodiment)
Next, an eighteenth embodiment of the present invention will be described.
In the first to seventeenth embodiments, the example in which the spacer is formed on the translucent substrate has been described. However, in the following eighteenth to twenty-second embodiments, the spacer is formed on the solid-state imaging device substrate side. An example will be described.
In the present embodiment, a spacer 106S is integrally formed on a silicon substrate 101 that constitutes a solid-state imaging device substrate. Other portions are formed in the same manner as in the above embodiment.
[0144]
First, as shown in FIG. 21A, a resist pattern is formed on the surface of the silicon substrate 101 by photolithography, and by using this as a mask, a recess 105 is formed by selective etching, as shown in FIG. A spacer 106S is formed.
[0145]
Thereafter, as shown in FIG. 21C, a channel stopper layer is formed in the element formation region surrounded by the spacer 106S by using a normal silicon process, the channel region is formed, the charge transfer electrode,. The element region 102 is formed. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection.
[0146]
Thereafter, as shown in FIG. 21 (d), a glass substrate 201 having a groove 204 formed thereon is prepared, and as shown in FIG. 21 (e), it is opposed to the element formation surface of the solid-state imaging device substrate 100. And the glass substrate 201 is integrated. At the time of integration, the adhesive layer 107 applied to the spacer surface is heated to firmly integrate.
[0147]
Finally, as shown in FIG. 21 (f), both the glass substrate side and the solid-state imaging device substrate side can be separated into the solid-state imaging device by thinning by CMP. Again, the thinning step is not limited to CMP, and can be performed by grinding, polishing, etching, or the like.
[0148]
Further, when the groove 204 is not formed on the glass substrate, it can be separated with good workability by dicing or cutting with a laser. Furthermore, when the cutting groove 104 is not formed in the silicon substrate, it is possible to separate with good workability by cutting with a diamond blade.
[0149]
According to this method, since the spacer is integrally formed with the solid-state imaging element substrate, a highly reliable solid-state imaging device can be formed without causing distortion at the joint.
[0150]
(Nineteenth embodiment)
Next, a nineteenth embodiment of the present invention will be described.
In the eighteenth embodiment, the example in which the spacer is integrally formed on the solid-state imaging device substrate has been described. However, in this embodiment, the silicon substrate 108 is formed on the solid-state imaging device substrate via the adhesive layer 107. It may be attached and patterned on a solid-state image sensor substrate. Other portions are formed in the same manner as in the eighteenth embodiment.
[0151]
That is, as shown in FIGS. 22A to 22C, in this embodiment, first, a channel stopper layer and a channel region are formed on a silicon substrate 101 by using a normal silicon process. Then, element regions such as charge transfer electrodes are formed. Further, a wiring layer is formed on the surface, and a bonding pad BP made of a gold layer is formed for external connection.
[0152]
Then, as shown in FIG. 22A, a silicon substrate 103 is attached to the solid-state imaging device substrate via an adhesive layer 107.
Thereafter, as shown in FIG. 22B, the silicon substrate 103 is selectively removed on the solid-state imaging device substrate by an etching method using photolithography to form a spacer 103S.
Then, as shown in FIG. 22C, an adhesive layer 109 is applied on the spacer 103S, and a cutting groove 104 is formed.
[0153]
According to this method, since the spacer is formed after the element region is formed on the silicon substrate, the spacer is not obstructed when the element region is formed, and the manufacture is facilitated. Since it is not integral molding, there is also a problem that some distortion cannot be avoided.
[0154]
Note that the bonding and separation steps are the same as those described in the above embodiment.
[0155]
(20th embodiment)
Next, a twentieth embodiment of the present invention will be described.
In the nineteenth embodiment, the spacer 103S is formed by sticking the silicon substrate 108 on the solid-state image pickup device substrate via the adhesive layer 107 and etching it on the solid-state image pickup device substrate. As described above, in this embodiment, the dummy substrate 601 is used to form the spacer 103S on the dummy substrate, and the spacer 103S is attached to the silicon substrate 101 formed with the solid-state image sensor, that is, the solid-state image sensor forming substrate. You may make it wear. Other portions are formed in the same manner as in the nineteenth embodiment.
[0156]
That is, as shown in FIG. 23A, a silicon substrate 103 serving as a spacer is attached to a dummy plate 601 made of a silicon substrate via an adhesive layer 602 having a softening temperature of about 50 to 150 ° C. The silicon substrate 103 is selectively removed by an etching method using photolithography to form a spacer 103S. Thereafter, as shown in FIG. 23B, a silicon substrate 101 on which a solid-state imaging element is formed is attached to the spacer 103S side through an adhesive layer 202 having a softening temperature of about 100 to 200 ° C.
After the silicon substrate 101 on which the solid-state imaging element is formed in this way is adhered, as shown in FIG. 23C, the dummy layer 601 is removed by heating to about 50 to 150 ° C. to soften the adhesive layer 602. Then, as shown in FIG. 23 (d), the cutting groove 104 is formed, and the solid-state imaging device substrate 100 with the spacer is formed in the same manner as shown in FIG. 22 (b).
[0157]
Here, the bonding and separation process of the glass substrate and the solid-state imaging device substrate is the same as the process described in the eighteenth embodiment.
[0158]
According to this method, since it is not necessary to process the spacer on the solid-state image pickup device substrate, it is possible to prevent the solid-state image pickup device substrate from being damaged and causing a decrease in yield.
[0159]
In this embodiment mode, the cutting groove 104 is formed after the formation of the spacer. However, it goes without saying that the cutting groove 104 may be formed before the formation of the spacer.
[0160]
In the above embodiment, the bonding between the glass binder and the bonding between the silicon substrate constituting the solid-state imaging device and the spacer is performed using the adhesive layer, but the surface activation is performed and the room temperature direct bonding is performed. By joining with, it becomes possible to obtain a strong joint.
[0161]
In the first to twentieth embodiments (except for the eleventh, twelfth and fifteenth embodiments), the silicon substrate is used as the spacer. However, the present invention is not limited to this, and the thermal expansion coefficient is a solid-state imaging device substrate. For example, a close 42 alloy can be applied. A material having a thermal expansion coefficient close to that of the light-transmitting substrate may be used. Furthermore, a polyimide resin or the like may be used. In this case, it is flexible and has a strain absorption effect even when strain is generated due to temperature change.
Furthermore, the spacer may be formed by using an adhesive tape. In this case, after being attached to the entire surface, high-precision processing is possible by cutting using laser processing or the like.
[0162]
Furthermore, in the first to twentieth embodiments, when a dummy plate is used, a silicon substrate or a glass substrate is used. However, the present invention is not limited to this, and a metal plate or the like can also be used. Furthermore, a flexible film may be used.
[0163]
As the adhesive layer, a semi-curable resin, a UV curable resin, a UV / thermosetting resin, and a thermosetting resin are also applicable.
In addition, as a method for forming the adhesive layer, a transfer method, a screen printing method, a dispensing method, or the like can be appropriately selected.
In the eighteenth to twentieth embodiments, the cut groove is formed prior to the formation of the spacer, but it goes without saying that the cut groove may be formed after the formation of the spacer.
[0164]
(Twenty-first embodiment)
Next, a solid-state imaging device having a reinforcing plate will be described as a twenty-first embodiment of the present invention.
As shown in FIG. 24, this solid-state imaging device has a silicon oxide film (not shown) on the back surface side of the silicon substrate 101 constituting the solid-state imaging device substrate 100 of the solid-state imaging device of the first embodiment. A reinforcing plate 701 made of a silicon substrate bonded together is attached. Here, a reinforcing plate 701 made of a silicon substrate having a silicon oxide film formed on the surface is bonded onto the solid-state imaging device substrate by direct bonding using surface activated room temperature bonding.
[0165]
The element configuration is the same as that of the solid-state imaging device described in the first embodiment, and the strength is weakened by thinning the silicon substrate from the back surface to about half the thickness by CMP or the like and making it thin. In order to compensate for this, a reinforcing plate 701 is bonded to the back surface.
[0166]
According to this configuration, the solid-state imaging device substrate 100 can be thinned to increase the driving speed, and the strength reduction due to the thinning can be compensated for by the reinforcing plate. In addition, moisture resistance is improved.
[0167]
Next, the manufacturing process of this solid-state imaging device will be described.
The process up to the step of attaching the glass substrate to the solid-state imaging device substrate is basically the same as that of the first embodiment. That is, as shown in FIG. 25A, an element region constituting a solid-state imaging element is formed on a silicon substrate 101 having a cutting groove 104 formed in advance using a normal silicon process, and a wiring layer is formed on the surface. Then, a bonding pad BP made of a gold layer is formed for external connection.
[0168]
Thereafter, as shown in FIG. 25 (b), alignment is performed by alignment marks formed on the peripheral edge of each substrate, and sealing is performed on the solid-state imaging device substrate 100 in which the element regions are formed as described above. The cover glass 200 is placed and heated, and both are integrated by the adhesive layer 202. This step may be surface activated room temperature bonding.
[0169]
Thereafter, as shown in FIG. 25C, the glass substrate is left as it is, and a method such as CMP is similarly performed from the back side of the silicon substrate 101, and polishing is performed up to the portion of the cut groove 104, whereby individual solid-state imaging is performed. Separate into equipment.
[0170]
Further, as shown in FIG. 25 (d), a reinforcing plate 701 made of a silicon substrate having a silicon oxide film (not shown) formed on the surface is provided on the back surface side of the thinned silicon substrate 101. Bonding is performed by direct bonding using normal temperature bonding.
[0171]
Finally, the back side of the glass substrate 201 is removed until it reaches the groove 204, and the glass substrate is thinned and simultaneously separated. Finally, the reinforcing plate is diced using a diamond blade (grinding stone) or the like to form a solid-state imaging device with a reinforcing plate as shown in FIG.
[0172]
In this way, a solid-state imaging device can be formed very easily.
As described above, according to the method of the present invention, since the individual mounting is performed and the individual separation is performed without performing the alignment or the electrical connection such as the wire bonding, the manufacturing is easy and It is easy to handle. Moreover, since the silicon substrate is first thinned and separated and a reinforcing plate is attached, and then the reinforcing plate is diced, the reliability is high.
[0173]
In the present embodiment, the spacer formed on the glass substrate is used. However, the spacer provided on the solid-state image pickup device substrate or a separately provided spacer can be applied.
[0174]
Moreover, in the said embodiment, although the reinforcement board was comprised with the silicon substrate insulated and separated from the solid-state image sensor board | substrate, it was made to have heat insulation, but it utilizes as a heat sink using a board | substrate with favorable thermal conductivity. It is also possible. Moreover, according to the present embodiment, the moisture resistance is also improved. The present embodiment can also be applied when there is no cutting groove 104.
[0175]
(Twenty-second embodiment)
In addition, as a twenty-second embodiment of the present invention, a shield plate 801 can be obtained by attaching a metal substrate such as tungsten or chrome as shown in FIG. 26 instead of the reinforcing plate. . The other parts are configured in exactly the same way.
According to such a configuration, electromagnetic waves can be shielded and unnecessary radiation noise can be reduced.
[0176]
(Twenty-third embodiment)
Next, a twenty-third embodiment of the present invention is described.
In the first to the twenty-second embodiments, the bonding pad formed on the surface of the solid-state image sensor substrate is formed so as to be exposed, and the light-transmitting property is obtained so that electrical connection is possible on the surface of the solid-state image sensor substrate. Although the edge of the substrate (glass substrate) 201 is formed so as to be inward of the edge of the solid-state imaging device substrate, in this embodiment, the solid-state imaging device substrate and the glass substrate are configured to have the same edge. ), The back surface side is taken out through the through-hole H penetrating the solid-state imaging device substrate 100 and the reinforcing plate 701 attached to the back surface. Reference numeral 108 denotes a conductor layer, and 109 denotes a silicon oxide layer as an insulating layer. That is, the surface of the solid-state image pickup device substrate 100 made of the silicon substrate 101 as the semiconductor substrate on which the solid-state image pickup device 102 is formed is transparent through the spacer 203S so as to have a gap C corresponding to the light receiving region of the silicon substrate 101. The glass substrate 201 as the optical member is bonded, and is taken out to the back surface side of the solid-state image pickup device substrate 100 by the through hole H formed in the silicon substrate 101, and an external take-out terminal formed on the back surface of the solid-state image pickup device substrate 100 The pad 113 and the bump 114 are formed, and the peripheral edges are individually separated by dicing, and external connection is made through the bump 114. Here, as shown in FIG. 28D, it is connected to the peripheral circuit substrate 901 through the anisotropic conductive film 115. In addition, diffusion bonding using ultrasonic waves, solder bonding, and eutectic bonding by thermocompression bonding are also effective. Furthermore, the gap may be underfilled with resin. Here, the spacer 203S has a height of 30 to 150 μm, preferably 80 to 120 μm. Other parts are formed in the same manner as in the first embodiment.
[0177]
FIGS. 27A to 27C and FIGS. 28A to 28D show the manufacturing process of the solid-state imaging device.
[0178]
That is, in this method, in the fourth embodiment, as in the steps shown in FIGS. 6A to 6B, an element region for forming a solid-state imaging element is formed using a normal silicon process. A reinforcing plate 701 made of a silicon substrate on which a silicon oxide film (not shown) is formed is bonded to the back surface of the solid-state imaging device substrate 100 on which bonding pads BP for external connection are formed by surface active room temperature bonding. (Fig. 27 (a))
[0179]
Thereafter, as shown in FIG. 27B, alignment is performed using alignment marks formed on the peripheral edge of each substrate, and the flat glass substrate 201 is formed on the solid-state imaging device substrate 100 formed as described above. The cover glass 200 to which the spacer 203S is bonded is placed on the substrate, and both are integrated by the adhesive layer 207 by heating.
[0180]
Then, through holes are formed from the back side of the reinforcing plate 701 by an etching method using photolithography. Then, a silicon oxide film 109 is formed in the through hole by the CVD method, and thereafter anisotropic etching such as RIE or ICP dry etching is performed to leave the silicon oxide film 109 only on the side wall of the through hole. ), The bonding pad BP is exposed.
[0181]
Then, as shown in FIG.₆A tungsten film is formed as a conductor layer 108 in contact with the bonding pad in the through hole by a CVD method using the above.
[0182]
Then, as shown in FIG. 28B, bonding pads 113 are formed on the surface of the reinforcing plate 701, and bumps 114 are formed.
In this way, the signal extraction electrode terminal and the energization electrode terminal can be formed on the reinforcing plate 701 side.
[0183]
Then, as shown in FIG. 28C, an anisotropic conductive film 115 (ACP) is applied to the surface of the reinforcing plate 701.
Finally, as shown in FIG. 28D, a circuit board 901 on which a drive circuit is formed is connected via this anisotropic conductive film 115. The circuit board 901 has a contact layer 117 and a bonding pad 118 formed of a conductor layer filled in a through hole formed so as to penetrate the board.
Therefore, connection with a circuit board such as a printed circuit board can be easily achieved through the bonding pad 118. The contact layer 117 is formed by being aligned with the conductor layer 108 formed on the solid-state imaging device substrate.
[0184]
Thereafter, the entire device is diced along the dicing line DC and divided into individual solid-state imaging devices. (Although only one unit is shown in the drawing, a plurality of solid-state imaging devices are continuously formed on one wafer.)
In this way, a solid-state imaging device can be formed very easily with good workability.
[0185]
Since the reinforcing plate 701 is composed of a silicon substrate on which a silicon oxide film is formed, heat insulation or electrical insulation with the solid-state imaging device substrate 100 is possible.
[0186]
In the above embodiment, the conductor layer is formed in the through hole by the CVD method. However, the contact hole having a high aspect ratio can be easily obtained with good workability even by using a plating method, a vacuum screen printing method or a vacuum suction method. The conductor layer can be filled.
[0187]
Furthermore, in the above embodiment, the electrical connection between the front and back surfaces of the circuit board on which the solid-state imaging device substrate and the peripheral circuit are mounted using the through holes is not limited to this. It is also possible to form a contact so that the front and back are electrically connected by impurity diffusion.
In this way, the signal extraction electrode terminal and the energization electrode terminal can be formed on the reinforcing plate 701 side.
[0188]
(24th Embodiment)
Next, a twenty-fourth embodiment of the present invention will be described.
In the twenty-third embodiment, the through hole is formed so as to penetrate the reinforcing plate 701 and the conductor layer 111 is formed. However, in this embodiment, a silicon substrate in which holes (vertical holes) are formed in advance is used. A solid-state image sensor substrate is formed. Thereby, since the formation depth of the vertical hole can be shallow, productivity can be improved and the manufacturing yield can be improved. Other portions are formed in the same manner as in the twenty-third embodiment.
[0189]
That is, as shown in FIG. 29A, prior to forming the solid-state imaging device, first, a resist pattern is formed on the back surface of the silicon substrate by photolithography, and RIE (reactive ion etching) is performed using this resist pattern as a mask. Thus, the vertical hole 118 is formed. In this step, a pad 110 made of aluminum or the like is formed on the surface, and a vertical hole 118 is formed so as to reach this pad.
[0190]
Then, as shown in FIG. 29B, a silicon oxide film 119 is formed on the inner wall of the vertical hole by the CVD method.
Then, as shown in FIG. 29C, an element region for forming a solid-state imaging element was formed using a normal silicon process as in the above embodiments.
And as shown in FIG.29 (d), it aligns with the alignment mark formed in the peripheral part of each board | substrate, On the solid-state image sensor board | substrate 100 formed as mentioned above, on the flat glass substrate 201 The cover glass 200 to which the spacer 203S is bonded is placed and heated, and both are integrated by the adhesive layer 207. Again, the bonding step may use surface activated room temperature bonding.
[0191]
Then, as shown in FIG. 29 (e), a reinforcing plate 701 is bonded to the back surface side of the solid-state image pickup device substrate 100 by surface activation room temperature bonding, and the vertical hole 118 is etched from the back surface side by etching using photolithography. The through hole 108 is formed so as to reach. Again, it is desirable that the inner wall of the through hole be insulated. Moreover, you may make it use the reinforcement board which formed the through hole previously.
[0192]
Thereafter, by performing the steps shown in FIGS. 28A to 28D described in the twenty-third embodiment, a solid-state imaging device having a structure in which even a circuit board on which peripheral circuits are formed is easily formed. Is done.
As described above, according to the present embodiment, the vertical hole can be formed with a shallow depth, so that the productivity can be improved and the manufacturing yield can be improved.
[0193]
(25th embodiment)
Next, a twenty-fifth embodiment of the present invention is described.
In the twenty-fourth embodiment, the contacts are formed so as to penetrate the reinforcing plate 701, the solid-state imaging device substrate, and the circuit board, and the electrodes are taken out from the circuit board side. As shown in (a) and (b), a conductor layer 120 as a wiring layer is formed on the side wall, and electrodes are taken out from the side wall of the solid-state imaging device. Other portions are formed in the same manner as in the twenty-fourth embodiment.
[0194]
The manufacturing process is formed in substantially the same manner as in the twenty-fourth embodiment, but the through holes are formed so as to correspond to the end portions of the respective solid-state imaging devices, and the cutting line DC including the through holes is formed. The solid-state imaging device in which the wiring layer is formed on the side wall can be easily formed by dicing.
[0195]
In addition, if the conductor layer 120 filling the through hole is made of a light-shielding material such as tungsten, the solid-state imaging device is shielded from light even if it is not perfect, so that it is possible to reduce malfunctions. .
Moreover, if this reinforcement board is comprised with a polyimide resin, a ceramic, crystallized glass, the silicon substrate by which the surface and the back surface were oxidized as needed, the role of a heat insulation board | substrate can be given. Further, it may be formed of a moisture-proof sealing material or a light shielding material.
[0196]
(Twenty-sixth embodiment)
Next, a twenty-sixth embodiment of the present invention is described.
In the twenty-third and twenty-fourth embodiments, as shown in FIG. 28, the back surface side of the solid-state image pickup device substrate 100 is laminated on the peripheral circuit board via the reinforcing plate. As shown, the solid-state imaging device substrate 100 is stacked on the peripheral circuit substrate 901, and the reinforcing plates 701 are sequentially stacked on the back surface side of the peripheral circuit substrate. Other parts are formed in the same manner as in the twenty-fourth or twenty-fifth embodiment.
[0197]
This reinforcing plate also serves as a heat sink.
The manufacturing process is formed in substantially the same manner as in the twenty-third and twenty-fourth embodiments, but the connection resistance is reduced and the high-speed operation is achieved because the solid-state image pickup device substrate 100 and the peripheral circuit substrate 901 are arranged close to each other. Drive becomes possible.
[0198]
(Twenty-seventh embodiment)
Next, a twenty-seventh embodiment of the present invention is described.
In this example, in the twenty-sixth embodiment, the through hole is formed inside the substrate and the electrode is taken out on the back side of the peripheral circuit substrate. In this embodiment, as shown in FIG. The conductive layer 120 as a wiring layer is formed on the side wall with an insulating film 121 interposed therebetween. Other portions are formed in the same manner as in the twenty-sixth embodiment.
[0199]
At the time of manufacture, it is formed in substantially the same manner as in the twenty-fifth embodiment, but it is easy to form a solid with sidewall wiring only by allowing the dicing line to be in a position including a contact formed in a through-hole or the like. An imaging device can be formed.
[0200]
In this solid-state imaging device, since the wiring is formed on the side wall, a signal extraction terminal, a current supply terminal, and the like can be formed on the side wall. However, it goes without saying that the connection may be made by forming pads and bumps on the back surface side of the peripheral circuit board 901. Reference numeral 701 denotes a reinforcing plate.
In the twenty-first to twenty-seventh embodiments, the sealing cover glass 200 can be formed in the same manner as the manufacturing methods in the first to twentieth embodiments.
[0201]
(Twenty-eighth embodiment)
Next, a twenty-eighth embodiment of the present invention is described.
In the twenty-third embodiment, the through hole is formed inside the substrate and the electrode is taken out on the back side of the peripheral circuit substrate. In this embodiment, however, as shown in FIG. The conductor layer 209 is formed in the through hole 208 formed in the 201 and the spacer 203S, the pad 210 is formed on the upper surface of the glass substrate, and the signal extraction terminal and the current supply terminal are formed above. It is. Other portions are formed in the same manner as in the twenty-third embodiment shown in FIGS.
[0202]
Next, the manufacturing process of this solid-state imaging device is shown in FIGS. 34 (a1) to (f) and FIGS. 35 (a) to (e).
[0203]
That is, in the twenty-third embodiment, in the step shown in FIG. 27C, a through hole is formed in the solid-state image sensor substrate 100, and a signal extraction terminal and a current supply terminal are provided on the back side of the solid-state image sensor substrate. In contrast to this, in this method, the spacer 203S is attached to the glass substrate 201 constituting the sealing cover glass 200, and in that state, the through hole 208 is formed so as to penetrate the spacer and the glass substrate. A conductor layer is formed thereon, and a signal extraction terminal and a current supply terminal are formed on the surface of the sealing cover glass.
[0204]
First, as shown in FIG. 34 (a1), a silicon substrate 203 having a thickness of 30 to 120 μm for preparing spacers is prepared.
Next, as shown in FIG. 34 (a2), a glass substrate 201 for constituting the sealing cover glass 200 is prepared.
Then, as shown in FIG. 34B, an adhesive layer 202 is applied to the surface of the substrate 203.
[0205]
Thereafter, as shown in FIG. 34C, a silicon substrate 203 coated with an adhesive layer 202 is adhered to the surface of the glass substrate 201.
[0206]
Subsequently, as shown in FIG. 34D, a resist pattern is formed by photolithography, and RIE (reactive ion etching) is performed using the resist pattern as a mask, so that a region corresponding to the photodiode, that is, a light receiving region (FIG. An adhesive is applied in advance so as to remove the concave portion 205 including the region corresponding to 40) in b), or after RIE, removal treatment is performed with oxygen plasma or the like.
[0207]
Subsequently, as shown in FIG. 34 (e), a resist pattern is formed by photolithography, RIE (reactive ion etching) is performed using this resist pattern as a mask, and a through hole is formed so as to penetrate the spacer 203S and the glass substrate 201. 208 is formed.
[0208]
Then, if necessary, a silicon oxide film (not shown) is formed at least on the inner wall of the spacer made of silicon by CVD.
Note that this step is not necessary when the spacer is formed of an insulator such as glass or resin. Further, a light shielding film may be formed on the inner wall or the outer wall of the spacer.
[0209]
Thereafter, as shown in FIG. 35 (a), a conductor layer 209 is formed on the inner wall of the through hole whose inner wall is insulated by vacuum screen printing or metal plating using a conductive paste such as silver paste or copper paste. A through contact region that penetrates the spacer 203S and the glass substrate 201 is formed.
[0210]
Then, as shown in FIG. 35B, gold bonding pads 210 and 211 or bumps 212 are formed on the front and back surfaces of the glass substrate with spacers so as to be connected to the through contact region. Here, when forming the film, a gold thin film is formed on the front surface and the back surface and patterned by an etching method using photolithography, or screen printing, selective plating, or the like can be applied.
[0211]
Further, as shown in FIG. 35C, an anisotropic conductive resin film 213 is applied.
[0212]
On the other hand, as shown in FIG. 35 (d), a solid-state image pickup device substrate 100 formed with a reinforcing plate 701 is prepared in the same manner as in the twenty-third embodiment (see FIG. 27 (a)). To do.
[0213]
Then, as shown in FIG. 35 (e), alignment is performed using alignment marks formed on the peripheral edge of each substrate, and a flat glass substrate 201 and spacers are formed on the solid-state imaging device substrate 100 formed as described above. The cover glass 200 to which 203S is bonded is placed and heated, and both are integrated by the anisotropic conductive film 213.
[0214]
Thereafter, the entire device is diced along the dicing line DC and divided into individual solid-state imaging devices.
In this way, a solid-state imaging device in which a contact region such as a bonding pad is formed on the sealing cover glass is formed extremely easily and with good workability.
[0215]
(Twenty-ninth embodiment)
Next, a twenty-ninth embodiment of the present invention is described.
In the twenty-eighth embodiment, the solid-state imaging device has been described in which a through-hole penetrating the glass substrate and the spacer is formed and a contact region such as a bonding pad is formed on the sealing cover glass. In the thirty-third embodiment, this modification will be described.
First, the present embodiment is characterized by the formation of a through hole in a spacer, and a glass substrate 201 is prepared as shown in FIG.
And as shown in FIG.36 (b), a photocurable resin is formed in the surface of this glass substrate 201 by the optical modeling method, and the spacer 213 is formed.
Thereafter, as shown in FIG. 36C, a through hole 208 is formed by an etching method using photolithography.
Thus, it is possible to easily obtain a sealing cover glass having a spacer and a through hole.
After that, as described in the twenty-eighth embodiment, the mounting process shown in FIGS. 35 (a) to 35 (e) is executed, bonded to the solid-state image pickup device substrate, and then diced. Thus, the solid-state imaging device shown in FIG. 35 (e) can be obtained.
According to this method, the spacer is easily formed. In this embodiment, a photo-curing resin is used, but the adhesive itself may be used. Since the glass substrate and the spacer are integrally formed, it is possible to reduce warpage and distortion, and manufacture is also easy.
[0216]
(Thirty Embodiment)
Next, a thirtieth embodiment of the present invention is described.
In the twenty-eighth embodiment, a silicon substrate for spacer formation is attached to the glass substrate and patterned, but in this embodiment, the glass substrate is etched in one etching step. Thus, the recess and the through hole may be formed simultaneously. Other portions are formed in the same manner as in the twenty-eighth embodiment.
[0217]
First, in the present embodiment, a glass substrate 201 is prepared as shown in FIG.
Then, as shown in FIG. 37 (b), a resist pattern R is formed on the front surface and the back surface of the glass substrate 201. The regions where through holes are to be formed have openings on both the front and back surfaces, If necessary, an area where the cutting groove 204) is to be formed has an opening only on the back surface side.
Thereafter, as shown in FIG. 37 (c), the glass substrate is etched from both sides using the front and back resist patterns as masks, thereby forming recesses 205, cutting grooves (not shown), and through holes 208 at the same time.
Thus, it is possible to easily obtain the sealing cover glass in which the spacers are integrally formed and the through holes are formed.
After that, as described in the twenty-eighth embodiment, the mounting process shown in FIGS. 35 (a) to 35 (e) is executed, bonded to the solid-state image pickup device substrate, and then diced. Thus, the solid-state imaging device shown in FIG. 35 (e) can be obtained.
Since the glass substrate and the spacer are integrally formed, it is possible to reduce warpage and distortion, and manufacture is also easy.
[0218]
(Thirty-first embodiment)
Next, a thirty-first embodiment of the present invention is described.
In the twenty-eighth embodiment, the silicon substrate for spacer formation is attached to the glass substrate and patterned, but in this embodiment, the spacer already patterned on the glass substrate 201 is used. 203S is pasted, and finally a through hole is formed by an etching process. Other portions are formed in the same manner as in the twenty-eighth embodiment.
[0219]
First, in the present embodiment, a glass substrate 201 is prepared as shown in FIG.
On the other hand, as shown in FIG. 38 (a2), a silicon substrate 203 for spacer formation is prepared.
Then, as shown in FIG. 38B, the silicon substrate 203 is processed by an etching method using photolithography to obtain a spacer 203S.
[0220]
Thereafter, as shown in FIG. 38C, an adhesive 202 is applied to the patterned spacer surface.
Then, as shown in FIG. 38 (d), the spacer 203 </ b> S is adhered while being aligned with the glass substrate 201.
Thereafter, as shown in FIG. 38E, a through hole 208 is formed by an etching method using photolithography.
[0221]
In this way, it is possible to easily obtain a sealing cover glass in which a spacer is attached and a through hole is formed.
[0222]
Then, if necessary, a silicon oxide film (not shown) is formed at least on the inner wall of the spacer made of silicon by CVD.
Note that this step is not necessary when the spacer is formed of an insulator such as glass or resin. Further, a light shielding film may be formed on the inner wall or the outer wall of the spacer.
[0223]
After that, as described in the twenty-eighth embodiment, the mounting process shown in FIGS. 35 (a) to 35 (e) is executed, bonded to the solid-state image pickup device substrate, and then diced. Thus, the solid-state imaging device shown in FIG. 35 (e) can be obtained.
[0224]
Note that the glass substrate and the spacer may be bonded to each other by applying an ultraviolet curable resin, a thermosetting resin, a combination thereof, or semi-cured adhesive application. In forming this adhesive, it is possible to appropriately select supply with a dispenser, screen printing, stamp transfer, and the like.
[0225]
In addition, as shown in FIG. 38C, the light shielding film 215 may be formed by a method such as sputtering a tungsten film on the inner side wall of the concave portion of the spacer.
This makes it possible to obtain good imaging characteristics without providing a separate light shielding film.
[0226]
(Thirty-second embodiment)
Next, a thirty-second embodiment of the present invention is described.
In the twenty-eighth embodiment, an example has been described in which a silicon substrate for spacer formation is attached to a glass substrate, this is patterned, and finally a through-hole penetrating the glass substrate and the spacer is formed by etching. In this embodiment, as shown in FIGS. 39 (a1) to (f), the shape of the silicon substrate is processed by etching to form the through hole 208a shown in FIG. 39 (e1). The glass substrate 201 on which the through-hole 208b shown in (b2) is formed is aligned using an alignment mark at the wafer level and bonded using the adhesive layer 202. Other portions are formed in the same manner as in the twenty-eighth embodiment.
[0227]
In this case, it is also possible to form the light shielding film (215) on the inner wall where the concave portion of the spacer is desired.
According to such a method, since the through holes are individually formed and bonded, alignment is necessary, but since the aspect ratio may be about half, the formation of the through holes becomes easy.
[0228]
After that, as described in the twenty-eighth embodiment, the mounting process shown in FIGS. 35 (a) to 35 (e) is executed, bonded to the solid-state image pickup device substrate, and then diced. Thus, the solid-state imaging device shown in FIG. 35 (e) can be obtained.
[0229]
(Thirty-third embodiment)
Next, a thirty-third embodiment of the present invention is described.
In the twenty-eighth embodiment, a silicon substrate for spacer formation is attached to a glass substrate, a conductor layer 209 is formed in a through-hole that penetrates the glass substrate and the spacer, and then the solid-state imaging device substrate 100 is formed. In this embodiment, as shown in FIGS. 40A to 40D, the above-described operations Nos. 28 to 32 are performed on the solid-state imaging device substrate 100 in which the reinforcing plate 701 is attached to the back surface. The glass substrate 200 with a spacer formed with the through-hole 208 formed in the form is aligned and bonded at the wafer level, and then the conductor layer 209 is formed in the through-hole 208. It is what. A bonding pad 210 is formed so as to be connected to the conductor layer 209. Other portions are formed in the same manner as in the twenty-eighth embodiment.
Again, when the conductor layer 209 is embedded, it can be easily formed by vacuum screen printing using a conductive paste such as copper paste or metal plating.
[0230]
(Thirty-fourth embodiment)
Next, a thirty-fourth embodiment of the present invention is described.
In the first to thirty-third embodiments, a sealing cover glass made of a plate-like body is used as the translucent member. However, the sealing cover glass itself has an imaging function, and an optical member is used. By configuring, the size can be further reduced.
[0231]
As shown in FIG. 41, this solid-state imaging device is characterized in that a sealing cover glass 220 with a lens array is used instead of the sealing cover glass 200 in the 28th to 33rd embodiments. Is.
The sealing cover glass 220 is formed by a molding method or an etching method.
[0232]
The other portions are formed in substantially the same manner as in the twenty-eighth embodiment.
In the twenty-eighth embodiment, as shown in FIG. 33, the conductor layer 209 is formed in the through hole 208 formed in the glass substrate 201 and the spacer 203S, and the pad 210 is formed on the upper surface of the glass substrate. In this embodiment, the bonding pad BP is connected to the external connection terminal in a part of the region (not shown), and the signal extraction terminal and the current supply terminal are connected to each other. It is characterized by comprising. Other portions are formed in the same manner as in the twenty-eighth embodiment shown in FIGS.
[0233]
Next, the manufacturing process of the solid-state imaging device is shown in FIGS. 42 (a1) to (d) and FIGS. 43 (a) to 43 (c).
[0234]
That is, the manufacturing process is also largely different in that a sealing cover glass 220 with a lens array is used in place of the sealing cover glass 200 in the 28th to 33rd embodiments.
[0235]
In the thirty-third embodiment, the spacer 203S is attached to the glass substrate 201 constituting the sealing cover glass 200, and in that state, the through hole 208 is formed so as to penetrate the spacer and the glass substrate. The conductor layer is formed on this, and the signal extraction terminal and the current supply terminal are formed on the surface side of the sealing cover glass.
[0236]
The adhesive layer 207 is formed on the surface of the spacer 203S of the sealing glass with lens array 220 formed in the steps shown in FIGS. 42A1 to 42D (shown in FIG. 43A).
[0237]
On the other hand, as shown in FIG. 43 (b), a solid-state imaging device substrate 100 formed with a reinforcing plate 701 is prepared in the same manner as used in the twenty-eighth embodiment.
[0238]
Then, as shown in FIG. 43 (c), the alignment is performed by the alignment mark formed on the peripheral portion of each substrate, and the lens array in which the spacer 223S is bonded onto the solid-state imaging device substrate 100 formed as described above. The cover glass 220 is placed and heated, and both are integrated by the adhesive layer 207 by heating.
[0239]
Modification examples of the manufacturing process of the sealing cover glass with lens array 220 will be described in the thirty-fifth to thirty-eighth embodiments.
[0240]
(Thirty-fifth embodiment)
Next, a thirty-fifth embodiment of the present invention is described.
In this embodiment, as shown in FIGS. 44 (a) and 44 (b), a sealing cover glass 220 with a lens array is prepared, and a recess 225 is formed by etching on the back surface side to integrally form a spacer 223S. It is characterized by. Other portions are formed in the same manner as in the above embodiment.
[0241]
According to such a configuration, the sealing cover glass 220 with a lens array that can be easily formed with good workability and is highly integrated and has no distortion can be obtained.
[0242]
(Thirty-sixth embodiment)
Next, a thirty-sixth embodiment of the present invention is described.
First, in the present embodiment, a glass substrate 220 with a lens array is prepared as shown in FIG.
And as shown in FIG.45 (b), photocurable resin is formed in the surface of this glass substrate 220 with a lens array by the optical modeling method, and the spacer 223S is formed.
Thus, it is possible to easily obtain a sealing cover glass having a spacer and a through hole.
After that, as described in the thirty-fourth embodiment, the mounting process shown in FIGS. 43 (a) to 43 (c) is executed, bonded to the solid-state image pickup device substrate, and then diced. As a result, the solid-state imaging device shown in FIG. 43C can be obtained.
[0243]
(Thirty-seventh embodiment)
Next, a thirty-seventh embodiment of the present invention is described.
In the thirty-fourth embodiment, a silicon substrate is attached to the sealing cover glass 220 with a lens array and patterned, but as shown in FIGS. 46 (a1) to (d), a lens is used. A spacer 203S formed by an etching method may be attached to the sealing cover glass 220 with an array. Here again, in the mounting step, a solid-state imaging device can be obtained by bonding to a solid-state imaging element substrate and dicing, as in the thirty-sixth embodiment.
[0244]
(Thirty-eighth embodiment)
Next, a thirty-eighth embodiment of the present invention is described.
As shown in FIG. 47, the sealing cover glass with lens array 220, the spacer 203S, and the solid-state imaging device substrate 100 with the reinforcing plate 701 may be fixed together.
[0245]
(Thirty-ninth embodiment)
Next, a thirty-ninth embodiment of the present invention is described.
Further, as shown in FIGS. 48A to 48D, the peripheral circuit substrate 901 shown in FIGS. 28A to 28D in the twenty-third embodiment is provided with an anisotropic conductive film 115 interposed therebetween. It is also possible to apply the sealing cover glass 220 with a lens array to a solid-state imaging device that is stacked in layers. Other portions are formed in the same manner as in the above embodiment.
In addition, for the connection of the peripheral circuit board 901, diffusion bonding using ultrasonic waves, solder bonding, and eutectic bonding by thermocompression bonding are also effective. Furthermore, you may make it underfill with resin.
Instead of the sealing cover glass 200 made of a plate-shaped body, a sealing cover glass 220 with a lens array may be used.
[0246]
(40th embodiment)
Next, a fortieth embodiment of the present invention is described.
As shown in FIG. 49, the solid-state image pickup device substrate 100, the peripheral circuit substrate 901, and the reinforcing plate 701 may be laminated in this order as in the twenty-sixth embodiment as shown in FIG. Other portions are formed in the same manner as in the above embodiment.
[0247]
(Forty-first embodiment)
Next, a forty-first embodiment of the present invention is described.
As shown in FIG. 50, it is also effective to form a wiring 221 on the side wall of the spacer.
In manufacturing, as in the twenty-seventh embodiment, a through hole is formed in a spacer, a conductor layer is formed in the through hole, and a solid-state image pickup device substrate and a sealing cover glass 220 with a lens are bonded together. Side wall wiring can be easily performed by dividing the substrate by dicing lines including through holes. Other portions are formed in the same manner as in the above embodiment.
[0248]
In the above-described embodiment, the method for bonding the glass substrate constituting the sealing cover glass and the spacer and the bonding of the solid-state imaging device substrate and the sealing cover glass using the adhesive layer has been described. However, in all the embodiments, when the spacer and the surface of the solid-state imaging device substrate are made of Si, metal, or inorganic compound, they can be appropriately joined by surface activated room temperature bonding without using an adhesive. When the cover glass is Pyrex and the spacer is Si, anodic bonding is also possible. When an adhesive layer is used, not only a UV adhesive but also a thermosetting adhesive or a thermosetting combined UV curable adhesive may be used as the adhesive layer.
When using a semi-curing adhesive, it is possible to make corrections at the time of alignment by applying it in a liquid state and semi-curing and aligning it. It becomes possible to form.
[0249]
Further, as described in the first embodiment, in all the embodiments, as a spacer, in addition to a silicon substrate, 42 alloy, metal, glass, photosensitive polyimide, polycarbonate resin, and the like can be appropriately selected.
[0250]
In addition, when the solid-state imaging device substrate and the sealing cover glass are joined using the adhesive layer, it is preferable to prevent the molten adhesive layer from flowing out by forming a liquid reservoir. The same applies to the joint portion between the spacer and the solid-state imaging device substrate or the sealing cover glass. As shown in FIGS. 51A to 51F, examples of the shape of the joint end portion of the spacer are recessed in the joint portion. Alternatively, the melted adhesive layer may be prevented from flowing out by forming a convex portion and forming a liquid reservoir.
[0251]
Furthermore, in order to strengthen the bonding between the solid-state imaging device substrate and the sealing cover glass and prevent deterioration of the solid-state imaging device, a glass substrate including a sealing cover glass 201 with a sealing resin as shown in FIG. 200 and the spacer 203S, and the joint between the spacer and the solid-state imaging device substrate 100 may be sealed with a sealing resin M. As a result, it is possible to prevent intrusion of moisture or the like and obtain high reliability.
As the sealing resin, epoxy, oxetane, silicon, acrylic, etc. are suitable, can form a desired sealing region, prevent intrusion of moisture, etc., and can obtain high reliability. Any resin may be used.
[0252]
At the time of formation, a jig is used to supply a sealing resin to a region excluding the bonding pad BP (electrode pad) with a dispenser, and after curing, the jig is removed to cover the resin without covering the bonding pad. Can be stopped. Here, it is desirable that the sealing resin be curable at 80 ° C. or lower as in the case of the adhesive described above. As the resin, it is desirable to use a photocurable resin or a room temperature curable resin. When using a photocurable resin, it is desirable that the jig is composed of a light transmissive member.
[0253]
In the above-described embodiment, the element formed with the cut groove is separated into individual elements by CMP up to the position of the cut groove. However, grinding, polishing, whole surface etching, or the like can also be used.
[0254]
Moreover, in the said embodiment, when using a reinforcement board (701), as a material, if it comprises a polyimide resin, a ceramic, crystallized glass, the silicon substrate etc. which oxidized the surface and the back surface as needed, heat insulation will be carried out. It can have the role of a substrate. Moreover, you may make it form with a light shielding material.
[0255]
Moreover, in the said embodiment, when bonding of a glass substrate and a spacer is required, you may be made to perform by ultraviolet curing resin, thermosetting resin, these combination, or semi-hardened adhesive application | coating. In forming this adhesive, it is possible to appropriately select supply with a dispenser, screen printing, stamp transfer, and the like.
[0256]
In addition, the examples described in the embodiments can be mutually modified within a range applicable to all forms.
[0257]
【The invention's effect】
As described above, according to the manufacturing method of the solid-state imaging device of the present invention, positioning at the wafer level, including the formation of the electrode terminal for external extraction, integrated by mounting in a lump, Since the imaging elements are separated, it is possible to form a solid-state imaging device that is easy to manufacture and highly reliable.
[Brief description of the drawings]
FIGS. 1A and 1B are a cross-sectional view and a main part enlarged cross-sectional view showing a solid-state imaging device formed by a method according to a first embodiment of the present invention.
FIGS. 2A to 2C are diagrams illustrating manufacturing steps of the solid-state imaging device according to the first embodiment of the present invention. FIGS.
FIGS. 3A to 3C are diagrams showing manufacturing steps of the solid-state imaging device according to the first embodiment of the present invention. FIGS.
FIGS. 4A to 4D are diagrams showing manufacturing steps of the solid-state imaging device according to the second embodiment of the present invention. FIGS.
FIGS. 5A to 5E are diagrams showing manufacturing steps of the solid-state imaging device according to the third embodiment of the present invention.
FIGS. 6A to 6D are diagrams showing manufacturing steps of the solid-state imaging device according to the fourth embodiment of the present invention. FIGS.
FIGS. 7A to 7D are diagrams illustrating manufacturing steps of the solid-state imaging device according to the fifth embodiment of the present invention. FIGS.
FIGS. 8A to 8D are diagrams illustrating manufacturing steps of the solid-state imaging device according to the sixth embodiment of the present invention. FIGS.
FIG. 9 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the seventh embodiment of the present invention.
FIG. 10 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the eighth embodiment of the present invention.
FIG. 11 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the ninth embodiment of the present invention.
FIG. 12 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the tenth embodiment of the present invention.
FIG. 13 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the tenth embodiment of the present invention.
FIG. 14 is a diagram showing manufacturing steps of the solid-state imaging device according to the eleventh embodiment of the present invention.
FIG. 15 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twelfth embodiment of the present invention;
FIG. 16 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the thirteenth embodiment of the present invention;
FIG. 17 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the fourteenth embodiment of the present invention;
FIG. 18 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the fifteenth embodiment of the present invention;
FIG. 19 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the sixteenth embodiment of the present invention;
FIG. 20 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the seventeenth embodiment of the present invention.
FIG. 21 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the eighteenth embodiment of the present invention;
FIG. 22 is a diagram showing manufacturing steps of the solid-state imaging device according to the nineteenth embodiment of the present invention.
FIG. 23 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twentieth embodiment of the present invention;
FIG. 24 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-first embodiment of the present invention;
FIG. 25 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-first embodiment of the present invention;
FIG. 26 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-second embodiment of the present invention;
FIG. 27 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-third embodiment of the present invention;
FIG. 28 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-third embodiment of the present invention;
FIG. 29 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-fourth embodiment of the present invention.
FIG. 30 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-fifth embodiment of the present invention.
FIG. 31 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-sixth embodiment of the present invention;
FIG. 32 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-seventh embodiment of the present invention;
FIG. 33 shows a solid-state imaging device according to a twenty-eighth embodiment of the present invention.
FIG. 34 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the twenty-eighth embodiment of the present invention;
FIG. 35 is a diagram showing manufacturing steps of the solid-state imaging device according to the 28th embodiment of the present invention;
FIG. 36 is a diagram showing manufacturing steps of the solid-state imaging device according to the 29th embodiment of the present invention;
FIG. 37 is a diagram showing manufacturing steps of the solid-state imaging device according to the thirtieth embodiment of the present invention.
FIG. 38 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the thirty-first embodiment of the present invention;
FIG. 39 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the thirty-second embodiment of the invention;
FIG. 40 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the thirty-third embodiment of the present invention;
FIG. 41 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the thirty-fourth embodiment of the present invention;
FIG. 42 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the thirty-fourth embodiment of the present invention;
FIG. 43 is a diagram showing manufacturing steps of the solid-state imaging device according to the thirty-fourth embodiment of the present invention.
FIG. 44 is a diagram showing manufacturing steps of the solid-state imaging device according to the 35th embodiment of the present invention;
FIG. 45 is a diagram illustrating manufacturing steps of the solid-state imaging device according to the thirty-sixth embodiment of the present invention;
FIG. 46 is a diagram showing manufacturing steps of the solid-state imaging device according to the thirty-seventh embodiment of the present invention.
FIG. 47 is a diagram showing manufacturing steps of the solid-state imaging device according to the thirty-eighth embodiment of the present invention.
FIG. 48 is a diagram showing manufacturing steps of the solid-state imaging device according to the thirty-ninth embodiment of the present invention.
FIG. 49 is a diagram showing a manufacturing process of the solid-state imaging device according to the 40th embodiment of the present invention;
FIG. 50 is a diagram showing manufacturing steps of the solid-state imaging device according to the forty-first embodiment of the present invention.
FIG. 51 is a diagram showing the shape of a liquid reservoir in an embodiment of the present invention.
FIG. 52 is a diagram showing a modification of the solid-state imaging device according to the embodiment of the present invention.
[Explanation of symbols]
100 Solid-state image sensor substrate
101 Silicon substrate
102 Solid-state image sensor
200 Cover glass for sealing
201 glass substrate
203S spacer

Claims (6)

Forming a plurality of solid-state imaging elements on a semiconductor substrate surface;
Bonding a translucent member to the surface of the semiconductor substrate via a spacer so as to have a gap facing each light receiving region of the solid-state imaging device;
Forming an external connection terminal on the surface of the semiconductor substrate corresponding to the solid-state imaging device;
The assembly and the semiconductor substrate and the light transmissive member is bonded by the bonding step, see containing and separating each solid-state imaging device having an external connection terminal,
Solid-state imaging characterized in that the spacer is made of a semiconductor material and bonded to the surface of the semiconductor substrate using a thermosetting adhesive or a room temperature curable adhesive that is bonded at an adhesive temperature not exceeding 80 ° C. Device manufacturing method.   Prior to the bonding step, including a step of forming a protrusion by selectively removing the surface of the semiconductor substrate so as to surround the light receiving region, and the protrusion allows the light receiving region and the translucent member to be formed. The method for manufacturing a solid-state imaging device according to claim 1, wherein a gap is formed between them.   2. The method of manufacturing a solid-state imaging device according to claim 1, wherein in the bonding step, the spacer is disposed so as to surround the light receiving region. The separating step is such that the peripheral edge of the translucent member is inward of each peripheral edge of each solid-state image sensor so that the peripheral surface of the solid-state image sensor is exposed from the translucent member. method for manufacturing a solid-state imaging device according to claim 1 to 3, characterized in that it comprises the step of separating the light-transmitting member so as to be located. Method for manufacturing a solid-state imaging device according to any one of claims 1 to 4 comprising the step of resin-sealing the periphery of the joint between the external connecting said terminal and said translucent member so allowed to expose the semiconductor substrate surface . The method of manufacturing a solid-state imaging device according to claim 5 , wherein the resin sealing step is performed at a temperature not exceeding 80 ° C. 6.

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