Method of manufacturing semiconductor device and semiconductor device

A method of manufacturing a semiconductor device provided with an interlayer insulating film formed on a semiconductor substrate, and a plurality of wiring layers formed on the interlayer insulating film. The method includes forming of a first wiring layer closest to the semiconductor substrate among the plurality of wiring layers, and forming of an alloy of a titanium layer and a metal layer by heating treatment. The forming of the first wiring layer includes: forming of a titanium layer on an interlayer insulating film; forming of a metal layer containing a metal capable of forming an alloy with titanium in the titanium layer; forming of an orientation layer on the metal layer; and forming of an aluminum layer on the orientation layer.

BACKGROUND

1. Field of the Invention

The present disclosure relates to a method of manufacturing a semiconductor device and the semiconductor device.

2. Description of the Related Art

Various types of metal wiring are disposed on a semiconductor substrate for transferring a signal and controlling operation of a device. The wiring is formed in an interlayer insulating film formed on the semiconductor substrate, and aluminum is widely used as a main material thereof.

Then, in order to improve an electromigration resistance (hereinafter, also referred to as EM) feature in a case where the aluminum is used, there is used the wiring in which titanium, titanium nitride, and aluminum are laminated from lower to upper layers in order.

By the way, in manufacturing of the semiconductor device, hydrogen processing (sintering) is performed, for example, to terminate a dangling bond in a semiconductor layer.

In Japanese Patent Application Laid-Open No. 2010-153884 (hereinafter, referred to as Patent Literature 1), there is disclosed a technique of suppressing titanium from adsorbing hydrogen during the sintering in a structure having the above-described wiring. Specifically, by forming an underlay layer below a layer of titanium in the above-described wiring structure of titanium/titanium nitride/aluminum, transmission of the hydrogen into a titanium film is suppressed, and an amount of the hydrogen being adsorbed on the titanium is decreased.

In the method described in Patent Literature 1, silicon nitride and titanium nitride are used as the underlay layer for preventing the transmission of the hydrogen on the titanium film. Between such films and silicon oxide, which is generally used as an interlayer insulating film, an interface stress is relatively large, whereby there is a possibility that the underlay layer may peel off from the interlayer insulating film in a process of forming the wiring.

SUMMARY

One embodiment of the present disclosure has been devised to solve the above-described problem, and an objective thereof is to enable decreasing an amount of hydrogen being adsorbed on titanium in wiring during sintering as well as to make stress on an interface between wiring and an interlayer insulating film small.

One embodiment of the present disclosure may be summarized as follows: a metal layer capable of forming an alloy with the titanium is formed on the titanium disposed on the interlayer insulating film, and then, the titanium is alloyed.

One aspect of the present disclosure is a method of manufacturing a semiconductor device provided with a first interlayer insulating film disposed on a semiconductor substrate and a plurality of wiring layers formed on the first interlayer insulating film, the method includes: forming of a first wiring layer closest to the semiconductor substrate among the plurality of wiring layers; and forming of an alloy of titanium in a first titanium layer and a first metal in a first metal layer by heating treatment. The forming of the first wiring layer includes forming of the first titanium layer on the first interlayer insulating film, forming, on the first titanium layer, of the first metal layer containing the first metal capable of forming an alloy with the titanium in the first titanium layer, forming of a first orientation layer on the first metal layer, and forming of a first aluminum layer on the first orientation layer.

A second aspect of the present disclosure is a semiconductor device provided with a first interlayer insulating film formed on a semiconductor substrate, and a plurality of wiring layers formed on the first interlayer insulating film. A first wiring layer, which is closest to the semiconductor substrate among the plurality of wiring layers, is provided with: a first titanium alloy layer disposed on the first interlayer insulating film; a first orientation layer disposed on the first titanium alloy layer; and a first aluminum layer disposed on the first orientation layer.

DESCRIPTION OF THE EMBODIMENTS

First Embodiment

A first embodiment described herein is described by usingFIG. 1.FIG. 1is a semiconductor device in which wiring according to one embodiment of the present disclosure is used. In a description, an image pickup device is used as one example of the semiconductor device.FIG. 1is a view schematically illustrating a section of the image pickup device. Note that a well-known or publicly known technique in the particular art is to be applied to a part not illustrated or described herein. Embodiments described hereinafter are exemplary embodiments of the present disclosure, and embodiments are not to be limited to these. The embodiment below is described by taking an example of a case where an electron is used as a signal carrier. In a case where a hole is used as the signal carrier, all of conductivity types may be reversed for each semiconductor area and an impurity region.

InFIG. 1, an image pickup device is described by taking a CMOS area sensor as an example. The CMOS area sensor is a sensor that forms an image pickup region and a peripheral circuit region in substantially the same process (CMOS process). The CMOS area sensor20is provided with: a photo diode unit (hereinafter, also referred to as a PD unit)200formed on a substrate203formed of an N-type silicon; and a transfer MOS transistor201that transfers an electric signal from the PD unit200. Furthermore, the CMOS area sensor20has wiring for giving bias for driving a MOS transistor such as the transfer MOS transistor201, wiring for transferring a signal generated in photoelectric conversion to a signal processing circuit therearound, and wiring for shielding light. In a case where an amplification function is provided to a pixel, it has an amplifying MOS transistor besides the transfer MOS transistor. Furthermore, it has a resetting MOS transistor, a pixel selecting MOS transistor, and the like as necessary. On the substrate203, a P-type well204is formed. In the P-type well204, an N-type electric carrier accumulation region208is formed, and a surface P-type area209for making the PD an embedded structure is formed thereon. Through a gate electrode207of the transfer MOS transistor, a drain region210of the transfer MOS transistor201is formed on an opposite side of the N-type electric carrier accumulation region208. The drain region210, which is an N-type impurity region, also functions as a floating diffusion region, which converts a transferred electric carrier into voltage.

The PD unit200and the transfer MOS transistor201are covered with an interlayer insulating film211containing silicon oxide, and a first wiring layer213is provided thereon. Wiring not connected with a gate electrode in the first wiring layer213is insulated from the gate electrode207by the interlayer insulating film211. The first wiring layer213includes wiring, which is connected to the drain region210by a contact plug212penetrating the interlayer insulating film211.

Similarly, the first wiring layer213is covered with an interlayer insulating film214, and a second wiring layer216is formed thereon. The second wiring layer216is connected to the first wiring layer213at a predetermined position by a via plug215, which penetrates the interlayer insulating film214. Similarly, the second wiring layer216is covered with an interlayer insulating film217, and a third wiring layer219is formed thereon. The third wiring layer219is connected to the second wiring layer216at a predetermined position by a via plug218, which penetrates the interlayer insulating film217. The contact plug212and the via plugs215and218are configured to contain tungsten.

The third wiring layer219is covered with a passivation film220, which is configured to contain a silicon nitride film. Between the passivation film220and an interlayer insulating film containing a silicon oxide film, it is also possible to form a silicon oxynitride film having an index of refraction between an index of refraction of the passivation film220and that of an interlayer insulating film. By this silicon oxynitride film, reflection of light is suppressed on an interface between the passivation film220and the interlayer insulating film217containing the silicon oxide film. Accordingly, it is possible to suppress color unevenness, which is caused when the reflected light enters the adjacent PD unit200. On an upper layer of the passivation film220, there is formed a color filter layer221and a micro lens layer222for improving sensitivity. In the color filter layer221, three primary colors of red, green, and blue are formed respectively corresponding to each of the PD units200.

The light, which has entered from a surface of the CMOS area sensor20, passes through the color filter layer221, is selectively dispersed into a wavelength indicating sensitivity of each color, and reaches the PD unit200through an opening region OP where no wiring layer exists. The light that has reached is absorbed inside the N-type electric carrier accumulation region208or inside the P-type well204of the PD unit200, and generates an electron-hole pair. The electron thereof is accumulated in the N-type electric carrier accumulation region208. The electron accumulated in the N-type electric carrier accumulation region208is sent to the drain region210by an on/off operation of the gate electrode207, and is read through a wiring structure constituted of the contact plug212, the first wiring layer213, and the like. In a case where an amplifying element is provided to the pixel, it is connected to a gate of an amplifying MOS transistor through the first wiring layer213. After being converted into voltage by an input node of the amplifying MOS transistor, it is transferred to the signal processing circuit through desired wiring.

Here, a detailed structure of wiring, which is a characteristic of this embodiment, is described by usingFIG. 2.FIG. 2is an enlarged view illustrating the image pickup device illustrated inFIG. 1centering on a part of the first wiring layer213.

The first wiring layer213is disposed on the interlayer insulating film211. In a state before a titanium alloy is formed in a titanium layer213adescribed below, from lower to upper layers in order, it includes five layers of the titanium layer213a, a metal layer213b, an orientation layer213c, an aluminum layer213d, and a barrier layer213e.

The titanium layer213ahas a small interface stress with the silicon oxide, which is generally used as the interlayer insulating film211, than an interface stress between the silicon oxide and titanium nitride or silicon nitride. Therefore, by the titanium layer213abeing formed on the interlayer insulating film211, it is possible to decrease a possibility of causing film peeling off during film-forming of the titanium layer213a. The titanium layer213ais desirably formed to have a (002) orientation so as to increase a crystal orientation property of the metal layer213bto be laminated thereon. The titanium layer213amay also include another metal element and non-metal element as long as there is not much influence on the interface stress with the interlayer insulating film211.

The metal layer213bis constituted of a metal capable of forming an alloy with the titanium layer213ain a lower layer by heating treatment. As a metal that constitutes the metal layer213b, for example, aluminum may be used. In order to increase an orientation property of the orientation layer213claminated on the metal layer213b, it is preferred that the metal layer213bbe oriented and grown by using crystal orientation of the titanium layer213aas an undercoat. In a case where the aluminum is used in the metal layer213b, by the aluminum being formed so as to have a (111) orientation, it is possible to obtain a good quality crystal film having a small lattice mismatch with titanium having the (002) orientation in the titanium layer213a.

A specific aspect of an alloy of the titanium in the titanium layer213aand a metal in the metal layer213bmay take a variety of aspects such as a eutectic, a solid solution, and an intermetallic compound. It is most preferable that the intermetallic compound be formed from a point of decreasing an amount of adsorption of hydrogen by the titanium.

It is preferred that a film thickness, when the metal layer213bis formed, be set such that all of the titanium in the titanium layer213acan be alloyed when an alloy is formed with the titanium layer213ain a lower layer. For example, in a case where aluminum is used as the metal layer213band an intermetallic compound of titanium and aluminum is formed, it is possible to cause the titanium in the titanium layer213ato sufficiently react by setting the film thickness of the metal layer213bto be three or more times that of a film thickness of the titanium layer213a. This is caused because a chemical theoretical mixture ratio of the intermetallic compound of the titanium and the aluminum is changeable between 1:3 and 3:1. That is, when the film thickness of the metal layer213bis three or more times that of the film thickness of the titanium layer213a, even when all of the intermetallic compounds to be formed are TiAl3, it is possible to alloy all of the titanium in the titanium layer213a. Once a titanium alloy layer is formed, an aluminum layer that is not alloyed may remain on the titanium alloy layer. Other than aluminum, nickel, for example, may be a material capable of forming an alloy with the titanium.

As a condition of the heating treatment, by heating up to 350 degrees or above of a substrate temperature, metal diffusion in the metal layer213bis prompted, whereby it is possible to further facilitate formation of the alloy with the titanium. On the other hand, in order to prevent orientation property in other layers of the wiring layer from being deteriorated due to the heating treatment, it is preferred that the substrate temperature be 500 degrees or below during the heating treatment. That is, it is preferred that the substrate temperature be set within a range of 350 degrees or above and 500 degrees or below during the heating treatment. As for a time of heating treatment, it is preferred that it be set within a range of 30 seconds to 60 minutes according to the film thickness of the titanium layer213a. Another metal element and non-metal element may be included in the metal layer213bas long as it does not excessively obstruct alloying with the titanium layer213a. As a material of the metal layer213b, aluminum to which copper of 0.5 weight % may be added.

The orientation layer213cis used with an objective of increasing crystal orientation property of the aluminum layer213dlaminated thereon. As a material of the orientation layer213c, for example, titanium nitride may be used. A lattice interval of a titanium nitride layer having the (111) orientation approximates a lattice interval of aluminum having the (111) orientation. Therefore, by using the titanium nitride having the (111) orientation as the orientation layer213c, it is possible to improve the (111) orientation of the aluminum layer213d, which is laminated on the orientation layer. Furthermore, in a case where the aluminum having the (111) orientation is used as the metal layer213b, it is possible to further improve the (111) orientation of the titanium nitride. Therefore, it is possible to further increase the orientation of the orientation layer213c, and further improve the (111) orientation of the aluminum layer213dformed on the orientation layer213c. The orientation layer213cmay contain other metal element and non-metal element as long as it does not excessively deteriorate crystallinity thereof.

In order to increase resistance against EM, it is preferred that the aluminum layer213dhave the (111) orientation. In this embodiment, as a material of the aluminum layer213d, aluminum to which 0.5 wt. % copper is added may be used. The aluminum layer213dmay contain other metal element and non-metal element as long as it does not excessively deteriorate conductivity and the resistance against EM thereof.

The barrier layer213eis formed for suppressing the aluminum in the aluminum layer213d, formed in a lower layer, from being diffused into the interlayer insulating film. As a material of the barrier layer213e, for example, titanium nitride is used. The barrier layer213eis not an essential component of this embodiment, but it is preferred to provide it for reliability and prolonged life of the wiring.

By performing the above-described heating treatment to the wiring layer having laminated films, the titanium in the titanium layer213aand a material in the metal layer213bform an alloy. The titanium in the alloy formed by the heating treatment has a small amount of adsorption of the hydrogen relative to the titanium in the titanium layer213abefore the alloy is formed. Therefore, in sintering performed after the heating treatment, adsorption of the hydrogen on the titanium is suppressed.

Hereinafter, the crystal orientation property of each film of the titanium layer213a, the metal layer213b, the orientation layer213c, and the aluminum layer213dis described more in detail. These layers are manufactured preferably by using a sputtering method in order to improve the orientation property. As described above, in a case where the aluminum is used in the metal layer213band the titanium nitride is used in the orientation layer, it is preferred that the titanium layer213ahave the (002) orientation and the metal layer213b, the orientation layer213c, and the aluminum layer213dhave the (111) orientation. In general, when the substrate temperature is low during the sputtering, movement of an atom is small, whereby it is known that a film-formed coating film has the crystal orientation such that a densest surface thereof becomes parallel to the substrate. Since a (002) surface is the densest in the titanium and a (111) surface is the densest in the titanium nitride, it is preferred that these films be manufactured at a low temperature.

Here, a film-forming condition for each layer is described in detail.

In the titanium layer213a, when the substrate temperature during film forming exceeds 300 degrees, the (002) orientation becomes weak, and the (011) orientation becomes strong. Therefore, it is preferred that the substrate temperature be set to 300 degrees or lower during the film forming. On the other hand, when the substrate temperature becomes lower than 50 degrees, crystallinity of the film is decreased. This is considered to be because sufficient energy is not given to sputtered titanium particles due to a low substrate temperature, whereby the titanium particles do not bond with each other on the substrate. Accordingly, with regard to the titanium layer213a, it is preferred that the substrate temperature be set in a range of 50 degrees or above and 300 degrees or below during the film forming by using the sputtering method. In order to improve the orientation property, it is preferred that the film forming be performed at a film forming rate of 1 nm/s or above and 5 nm/s or below. For the titanium nitride in the orientation layer213cas well, in order to obtain a titanium nitride film having the (111) orientation, it is preferred that the substrate temperature be set to 300 degrees or below during the film forming. Same as the titanium, the film crystallinity decreases when the substrate temperature becomes lower than 50 degrees, whereby it is preferred that the film forming be performed at 50 degrees or above. In order to improve the orientation, it is preferred that the film forming be performed such that the film forming rate become 1 nm/s or above and 5 nm/s or below by using a reactive sputtering method using a titanium target and nitrogen gas.

With regard to the aluminum in the metal layer213band the aluminum layer213das well, it is possible to obtain a film having the (111) orientation by using the sputtering method by setting the substrate temperature to 50 degrees or above and 300 degrees or below. In order to improve the orientation property, it is preferred that the film forming be performed such that the film forming rate is 5 nm/s or above and 20 nm/s or below.

As for a temperature control of the above-described substrate, various methods may be adopted such as heating by a heater provided within a substrate holder and by contacting a heated gas on a back surface of the substrate by using electrostatic adsorption. Furthermore, with regard to the sputtering method, any of DC and RF methods may be used, and a magnetron sputtering method is preferred from a viewpoint of increasing the orientation property.

In the image pickup device, in particular, terminating of a dangling bond of Si on a surface of the substrate203such as an N-type electric carrier accumulation region208, which functions as a part of the PD unit200, and a channel region223, through which a carrier passes, becomes important. A dark current may be effectively suppressed by terminating the dangling bond of the Si on the surface of these regions.

In this embodiment, it becomes possible to suppress the adsorption of hydrogen on the titanium contained in each of the wiring layers when the sintering is performed and to effectively terminate the dangling bond of the Si on the surface of the substrate203. Since the titanium layer is formed on the interlayer insulating film so as to contact the interlayer insulating film during forming of the wiring layer, the interface stress between the interlayer insulating film and the wiring layer during the titanium layer forming is small compared to when forming the titanium nitride and the silicon nitride on the interlayer insulating film. Furthermore, by orientation growing the titanium, the orientation property of the metal layer, the orientation layer, and the aluminum layer formed on the titanium layer is increased, whereby it is possible to increase the resistance against the EM.

Here, the first wiring layer213disposed at a position closest to the substrate203may influence an amount of hydrogen supplied to each point of the substrate203because it is close to the substrate203. Specifically, the amount of hydrogen supplied to each point of the substrate203is influenced by a wiring pattern of the first wiring layer213, and variation may be caused to the amount of hydrogen supplied to each point within a surface of the substrate203. To this, by applying the configuration according to this embodiment to the first wiring layer213disposed to the closest position relative to the substrate203, it is possible to decrease the variation in the amount of hydrogen supplied to each point within the surface of the substrate203due to the above-described wiring pattern. Therefore, the wiring structure according to this embodiment is used at least for the first wiring layer213. With regard to other wiring layers, in particular, a wiring layer that divides an opening region relative to light that enters the PD unit200has a larger area than the other wiring layers when it is viewed from a top face of the substrate203. Therefore, among a plurality of wiring layers, it may be effective to apply this embodiment to the wiring layer that divides the opening region in addition to the wiring layer closest to the substrate203from a viewpoint of decreasing adsorption of the hydrogen by the wiring layer. One example of the wiring layer that divides the opening region is a third wiring layer219.

Note that in this embodiment, the third wiring layer219is covered with a passivation film220formed of silicon nitride. The silicon nitride formed by a plasma excitation CVD (hereinafter, also referred to as PECVD) method contains much hydrogen within a film thereof, whereby sintering is performed by heating the substrate on which the silicon nitride film is formed. By the heating of the substrate, the hydrogen within the silicon nitride film is diffused, whereby terminating of the dangling bond of the Si on the surface of the substrate203is performed.

Next, a method of manufacturing the image pickup device according to this embodiment is described by usingFIGS. 3A to 3G.

First, there is prepared the N-type silicon substrate203on which the P-type well204, the drain region210, the N type electric carrier accumulation region208, the surface P-type area209, a field oxide film205, an unillustrated gate insulating film, and the gate electrode207are disposed (FIG. 3A).

Next, silicon oxide is deposited in the PECVD method so as to cover the substrate203, and the interlayer insulating film211is formed by performing planarization by a CMP method. Subsequently, a trench is formed by using a photolithography method, and the contact plug212is formed by filling a metal in the trench. The contact plug212may be configured to contain a barrier metal. An excessive metal film is removed by the CMP method. Then, layers213ato213edescribed inFIG. 2are laminated by the magnetron sputtering method to form a laminated film213S (FIG. 3B). The titanium layer213ais film formed by using the titanium target under a condition of a target voltage of 3 kW, a substrate temperature of 250 degrees, and a film forming rate of 2 nm/s. Both of the metal layer213band the aluminum layer213dare film formed by using an AlCu target under a condition of a target voltage of 22 kW, a substrate temperature of 300 degrees, and a film forming rate of 15 nm/s. The orientation layer213cis formed by using the titanium target by the reactive sputtering method in which nitrogen gas is flowed into a discharge space during sputtering. The orientation layer213cis film formed under a condition of a target voltage of 13 kW, a substrate temperature of 250 degrees, and a film forming rate of 2 nm/s. As one example of a detailed structure of the laminated film213S is, from lower to upper layers in order, the titanium layer is 100 Å, AlCu containing 0.5 wt. % of copper is 300 Å, TiN is 200 Å, AlCu containing 0.5 wt. % of copper is 3000 Å, and TiN is 300 Å.

Subsequently, the heating treatment is performed after the laminated film213S is patterned by using the photolithography method, whereby the first wiring layer213is formed. By performing the heating treatment, the titanium in the wiring layer and the metal layer form an alloy. The heating treatment is performed, for example, for 30 minutes at 400 degrees. Subsequently, the interlayer insulating film214is formed on the interlayer insulating film211and the wiring layer213. (FIG. 3C).

Next, a trench is formed in the interlayer insulating film214, and the via plug215is formed in the same way as the contact plug212, and an excessive metal film is removed. Then, a laminated film216S having a structure described inFIG. 2is formed on the interlayer insulating film214(FIG. 3D).

Subsequently, the heating treatment is performed after the laminated film216S is patterned to form a second wiring layer216. Then, the interlayer insulating film217, the via plug218, and a laminated film219S according to this embodiment are formed (FIG. 3E). The via plug218may be configured to contain a barrier metal.

Then, the heating treatment is performed after the laminated film219S is patterned to form the wiring layer219. Subsequently, on the interlayer insulating film217and the third wiring layer219, the passivation film220is formed by the PECVD method, and sintering is performed (FIG. 3F). In a case of this embodiment, by using the PECVD method using silane (SiH4) and oxygen when film forming the interlayer insulating films211,214, and217, the interlayer insulating films that have been formed contain hydrogen therein. Also, by using the PECVD method using the SiH4and ammonia (NH3) when forming the passivation film, the passivation film220that has been formed contains hydrogen therein. By performing the heating treatment for 30 minutes at 400 degrees, for example, on the substrate on which a film containing the hydrogen is formed, the hydrogen within the film is diffused, whereby it is possible to perform the terminating of the dangling bond on the surface of the substrate203.

Next, the color filter layer221and the micro lens layer222are formed on the passivation film220, whereby an image pickup device20can be obtained.

It is preferred that the heating treatment for alloying the titanium in a titanium layer in each of the laminated films213S,216S, and219S with the metal in the metal layer be performed after each of the laminated films is formed and before each of the interlayer insulating films is formed in each of the patterned laminated films. In addition to alloying of the titanium in the titanium layer with the metal in the metal layer, a lattice defect and the lattice mismatch within the aluminum layer are improved by performing the heating treatment after the laminated films are formed, whereby it is possible to decease a damage caused to the aluminum layer when the interlayer insulating film and the like are formed subsequently. By performing the heating treatment in a state where each of the laminated films is positioned in an uppermost surface of the substrate before the interlayer insulating film is formed, each of the laminated films is sufficiently heated and the alloying of the titanium is facilitated.

As a method of sintering, in this embodiment, a film containing hydrogen is formed on the semiconductor substrate, and the hydrogen is supplied to the surface of the substrate by heating the film. Various other methods may be adopted such as a method of exposing the substrate to a hydrogen atmosphere, a method of exposing the substrate to hydrogen plasma, and a method of performing heating together with these methods.

Second Embodiment

Next, one example of an image pickup system using an image pickup device is illustrated inFIG. 4. An image pickup system90, as illustrated inFIG. 4, is provided mainly with an optical system, the image pickup device20described in the first embodiment, and a signal processing unit. The optical system is mainly provided with a shutter91, a lens92, and a diaphragm93. The signal processing unit is mainly provided with a picked-up signal processing circuit95, an A/D converter96, an imaging signal processing unit97, a memory unit87, an external I/F unit89, a timing generation unit98, an overall control/calculation unit99, a recording medium88, and a recording medium control I/F unit94. Note that the signal processing unit may not be provided with the recording medium88. The shutter91is provided before the lens92on an optical path and controls exposure. The lens92refracts light that has entered and forms an image of a subject on an image pickup surface of a PD unit of the image pickup device20. The diaphragm93is provided between the lens92and the PD unit on the optical path, and adjusts an amount of light to be led to the PD unit after passing through the lens92. The PD unit of the image pickup device20converts the image of the subject formed on the image pickup surface into an imaging signal. The image pickup device20reads the imaging signal from the PD unit and outputs it. The picked-up signal processing circuit95is connected to the image pickup device20and processes the imaging signal that has been output from the image pickup device20. The A/D converter96is connected to the picked-up signal processing circuit and converts the processed imaging signal (analog signal) that has been output from the picked-up signal processing circuit95into an imaging signal (digital signal). The imaging signal processing unit97is connected to the A/D converter96. It performs various arithmetic processing such as correction on the imaging signal (digital signal) that has been output from the A/D converter96, and generates image data. This image data is supplied to the memory unit87, the external I/F unit89, the overall control/calculation unit99, the recording medium control I/F unit94, and the like. The memory unit87is connected to the imaging signal processing unit97and stores the image data that has been output from the imaging signal processing unit97. The external I/F unit89is connected to the imaging signal processing unit97. Accordingly, the image data that has been output from the imaging signal processing unit97is transferred to an external device (e.g. PC) through the external I/F unit89. The timing generation unit98is connected to the image pickup device20, the picked-up signal processing circuit95, the A/D converter96, and the imaging signal processing unit97. Accordingly, a timing signal is supplied to the image pickup device20, the picked-up signal processing circuit95, the A/D converter96, and the imaging signal processing unit97. Then, the image pickup device20, the picked-up signal processing circuit95, the A/D converter96, and the imaging signal processing unit97operate in synchronization with the timing signal. The overall control/calculation unit99is connected to the timing generation unit98, the imaging signal processing unit97, and the recording medium control I/F unit94, and it performs overall control of the timing generation unit98, the imaging signal processing unit97, and the recording medium control I/F unit94. The recording medium88is detachably connected to the recording medium control I/F unit94. Accordingly, the image data that has been output from the imaging signal processing unit97is recorded in the recording medium88through the recording medium control I/F unit94.

Note that the above-described image pickup device has been used as an example of a semiconductor device using wiring according to the present invention; however, the wiring according to the present invention is also applicable to various sensors using photoelectric conversion such as a photometry sensor and a ranging sensor as well as another semiconductor device.

This application claims the benefit of Japanese Patent Application No. 2013-176253, filed Aug. 28, 2013, which is hereby incorporated by reference herein in its entirety.