JPH09321330A - Optoelectronic device, manufacture thereof and information recording and/or reproducing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an optoelectronic device compact and thin by providing a wiring layer for connecting optoelectronic elements on a transparent substrate supporting the elements. SOLUTION: A transparent wiring or metal thin film wiring 16 made of e.g. ITO is disposed beneath a transparent substrate 8. Many optoelectronic unit elements 1 are electrically interconnected through the support 16. Electrodes 15a-15b are connected through the wiring 16 to form an element-to-element connection structure. The substrate 8 supports the elements 1 with leaving approximately a fixed space between the substrate and elements. The substrate also serves as a protective cover of photo-detecting windows elements 1. The electrodes 15a, 15b of the elements 1 are disposed at the photodetecting faces 1a of the elements 1 and the substrate 8 supports the elements 1 and also protects light incident windows and elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optoelectronic device (for example, a photoelectric conversion element such as a solar cell which can be used as a power source for a portable computer, a portable radio, etc. and an apparatus incorporating the same) and a manufacturing method thereof. , And an information recording and / or reproducing apparatus.

[0002]

2. Description of the Related Art Various electronic devices utilizing photoelectric conversion elements such as solar cells have been put to practical use in various office supplies such as portable calculators, portable radios, wrist watches and home electric appliances. These devices are provided with a photoelectric conversion function unit including a solar cell, which converts light energy incident from the outside into electric energy and generates electric energy for power supply.

FIG. 21 shows a unit of a general solar cell (hereinafter,
It is called a unit element or element. ) A cross-sectional view of an essential part showing an example of 36. According to the structure, in each unit element, the low resistance N ⁺ type silicon semiconductor layer 2b is formed on the N type silicon semiconductor substrate 2a, and the P ⁺ type silicon semiconductor layer 3 is formed so as to form a PN junction with the semiconductor substrate 2a. Is formed,
The surface is covered with an insulating film 4 made of SiO ₂ ,
As in 22, each electrode 5 is inserted in the contact hole of the insulating film 4.
a and 5b are respectively applied. Then, a large number of such elements are assembled, and the respective elements are electrically connected by the wiring 6 to form a solar cell module.

In this solar cell, as shown in the drawing, incident light L from the outside is incident from the light receiving surface 36a to generate photocarriers inside the element, and the resulting electric current is transmitted to the outside through electrodes and wiring. Can be stored in a secondary battery.

When single crystal silicon is used as a material for a solar cell, its photoelectric conversion efficiency is as high as about 20% (theoretically, it is said to be 29% at maximum), which is suitable for equipment requiring power. Is. In addition, a solar cell using amorphous silicon has a photoelectric conversion efficiency of about 12% when the light receiving surface is small and about 8% when the light receiving surface is large.
It is. There are also solar cells using cadmium-tellurium or gallium-arsenic.

The elements 36 configured as described above have various sizes. For example, a large number of square elements each having a size of several mm are arranged in a matrix on a common substrate. As shown in FIG. 22 and FIG. 24, the electrodes 5a and 5b are connected in series by the wiring 6, and the upper part thereof is covered with a translucent cover 41, and fixed to a casing (neither is shown) by a frame body. It constitutes the battery 35.

FIG. 23 (a) shows an example of a desktop or portable computer 37 using the above-mentioned solar cell 35 as a power source, and a general keyboard unit 39 and a display unit 38 are provided. It is a thing. The solar cell 35 is arranged so that the light receiving surface 36a faces the window 40 provided at the end of the computer 37.

The window 40 is provided with a resin cover 41 made of transparent plastic or the like to protect the solar cell 35 from damage. However, solar cells occupy a large part of the product, and since it is necessary to expose the light receiving surface of the solar cell to the surface that is easily exposed to light, we have struggled with efficient arrangement of solar cells so far. Is the current situation.

Therefore, for example, there has been proposed a method for solving the above-mentioned problems by, for example, forming a pattern of an arbitrary shape in an arbitrary color on the surface of the solar cell to enhance the design value of the solar cell ( JP-A-56-30770
Issue, Dosho 58-63180, Dosho 60-116252
No. 61-161791, Sho-62-19265
No. 5, 62-279681, 63-3387
No. 2, Dohei 6-37343, etc.).

FIG. 23 (b) is an enlarged view of a part of the window 40 of FIG. 23 (a). As shown in the figure, the elements 36 constituting the solar cell 35 are, for example, the element group 36A and the element group 36.
B is divided into different color patterns, for example, group 36
The letter pattern "ETL" by A can be observed from the outside.

In such color patterning, interference of reflected light of incident light occurs by changing the thickness of the insulating film 4 for each group, and the interference color using this can be observed as a pattern. This is a well-known method (which will be described later), but this method allows, for example, a unique pattern or letters, the name of the manufacturer of the device, etc. to be displayed in a color pattern. Can be improved and advertising effect can be realized.

However, in an electronic device using such a solar cell 35, the external pressure P, such as when the user's finger touches the window portion 40 or the entire portion is bent while being carried or used, FIG.
And as shown in FIG. 25 (FIG. 24 is a partial sectional view showing the state, and FIG. 25 is an enlarged view showing a part of FIG. 24).

That is, as shown in FIG. 25, for example, a large number of elements 36 as shown in FIG. 22 are arranged and fixed on a glass substrate 8, and a translucent resin is provided on the side opposite to the fixed surface (light receiving side). The cover 41 is provided to protect the light receiving surface 36a. However, there is only a slight gap C between the cover 41 and the element 36 as clearly shown in FIG. As a result, the cover 41 is bent toward the element 36 as shown by a virtual line.

Such bending easily occurs because the cover 41 is flexible, and by repeating this, the cover 41 deforms like a recess without flatness and contacts the element 36. Sometimes. Therefore, interference with the cover 41 is newly generated, and the color pattern display of, for example, the above-mentioned "ETL" formed on the element 36 may be blurred, faded, or disappear, and the appearance of almost monotonous color tone is exhibited. Not only does it not exist, but the deformed cover 41 may even damage the element 36.

In this case, it may not be possible to enhance the design value of the intended solar cell. In addition, the structure of the solar cell still needs to be improved in order to make it thinner, and further simplification is required in terms of structure and assembly.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and allows the device such as the above-described solar cell to exhibit its original performance and desired design value. It is an object of the present invention to provide an optoelectronic device having a compact structure and a thin structure, a manufacturing method thereof, and an information recording and / or reproducing device.

[0017]

As a result of intensive studies to achieve the above-mentioned object, the present inventor found an effective means for solving the above-mentioned drawbacks of the prior art, Has reached.

That is, according to the present invention, a plurality of optoelectronic elements (for example, solar cell unit elements: hereinafter the same).
And a translucent substrate (for example, a resin substrate: the same applies below) provided on the outer surface side facing these elements and supporting the element on the side opposite to the outer surface side. An optoelectronic device (for example, a solar cell device: hereinafter the same) in which a wiring layer for connecting elements is provided on the translucent substrate, and information recording and / or information of a radio receiver having the optoelectronic device on the outer surface side. It relates to a playback device.

Further, the present invention has a plurality of optoelectronic elements and a translucent substrate provided on the outer surface side facing these elements and supporting the element on the side opposite to the outer surface side. When manufacturing an optoelectronic device in which a wiring layer for connecting the optoelectronic element is provided on the transparent substrate, an electrode of the optoelectronic element is fixed to the wiring layer of the transparent substrate. The present invention relates to a method for manufacturing an optoelectronic device that electrically connects with each other.

The above "optoelectronics"
The concept is not limited to a device such as a solar cell described later, but is a concept including a device product incorporating the device.

According to the present invention, in the above-mentioned optoelectronic device, the translucent substrate supports the element, and the wiring layer also serves as a spacer between the substrate and the element. Even if the optical substrate is deformed toward the element side, the wiring layer can prevent the deformation, and the gap between the two can be maintained.

With the above structure, it is possible to form colors, characters and patterns suitable for a product on the substrate regardless of the shapes of wirings and elements inside the substrate, and to realize an appearance satisfying the customer at a low price. You can In addition, even if the substrate is colored, letters, patterns, etc., light can reach the element or can be emitted from the element.
The device performance has sufficient conversion efficiency to perform its original role.

Conventionally, a solar cell has been used in a wristwatch, and "the beads are arranged so as to contact each other by providing beads on the light-receiving surface side of the solar cell, or the surface of the solar cell is covered so that the solar cell is covered. There is a known technique of making the "invisible", but this is completely different from the object of the present invention. That is, the present invention is characterized in that it has a function of connecting an element such as a solar cell to a light-transmitting substrate, and can realize a thin and robust module.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION In the above optoelectronic device and the manufacturing method thereof according to the present invention, a plurality of photoelectric conversion elements and a plurality of photoelectric conversion elements, which are provided on the outermost surface side which is a light incident side facing the elements, are provided. And a transparent substrate supporting the wiring layer for interconnecting the plurality of photoelectric conversion elements is provided on the transparent substrate, and between the electrodes of the plurality of optoelectronic elements, It is desirable that they are electrically connected to each other via the wiring layer of the substrate.

In this case, the light-transmissive substrate provided on the light-receiving surface side of the optoelectronic element is used for a light incident window, a protective cover, interconnection between a plurality of photoelectric conversion elements, and support thereof. It is desirable that it also serves as a support plate.

Further, the above-mentioned apparatus may be formed by printing so as to exhibit a predetermined pattern in appearance.

In this case, it is desirable that the printing is performed on the light receiving surface side of the transparent substrate and / or the opposite side thereof, and the printing is performed by the transparent material.

Further, in the above apparatus, it is desirable that the light transmissive substrate has a light diffusing agent.

Further, in the above device, a light diffusion structure may be formed on the transparent substrate.

Further, in the above apparatus, a spacer may be arranged between the transparent substrate and the optoelectronic element, in which case the spacer is formed of a material having a lower hardness than that of the optoelectronic element, It is desirable that the optical substrate and the spacer are integrally formed of resin.

Further, in the above device, the transparent substrate may be made of an inorganic material.

Further, when the spacers are provided, it is desirable that a large number of spacers are formed by unevenness.

Further, it is preferable that the above-mentioned device is formed so that a predetermined element among the plurality of optoelectronic elements externally exhibits a pattern due to interference of light through the transparent substrate.

Further, in the above device, it is desirable that a plurality of optoelectronic elements are connected to each other by a protective resin on the side opposite to the transparent substrate.

By providing the optoelectronic device configured as described above on the outer surface side, an information recording and / or reproducing device, for example, a thin radio receiver or IC.
Cards can be constructed.

[0036]

EXAMPLES Examples of the present invention will be described below, but it goes without saying that the present invention is not limited to the following examples.

1 to 4 are partial sectional views of solar cells 46, 47, 48 and 49 according to first to fourth embodiments of the present invention.
FIG. 5 is an enlarged cross-sectional view showing a part thereof (of which FIG. 2 is an example).

The basic structure of each embodiment is, as shown in FIGS. 1 to 5, a transparent substrate made of polystyrene (hereinafter, referred to as
It may be referred to as a substrate. ) 8 for example under I
A group of a large number of unit elements 1 electrically connected to each other through transparent wiring made of TO (Indium Tin Oxide) or wiring 16 made of a metal thin film is arranged.
The lower part of this group is molded with a resin film 9 for protection and support (the same applies to each of the following examples).

Each of these elements 1 has a square shape of, for example, 4 mm square, is supported by the substrate 8 and is connected in series or in parallel, and is housed together with the resin film 9 in a casing (not shown). It consists of 46, 47, 48 and 49.

Therefore, as compared with a general solar cell in which an element group is provided on another substrate and a cover is provided thereon, a separate substrate is not provided, and the ordinary cover also serves as the substrate, so that it is made compact and thin. be able to. Further, the solar cell can be easily assembled.

As shown in FIG. 5, each of these elements 1 is formed by forming a P-type silicon semiconductor substrate 3 made of single crystal silicon and an N ⁺ -type silicon semiconductor layer 2 forming a light-receiving surface 1a in a PN junction. The light receiving surface 1a is covered with an insulating film 4 made of SiO ₂ . Then, on the light-receiving surface 1a side, an electrode is formed through a conductive adhesive 7 such as silver paste.
By connecting 15a and 15b to the wiring 16, the respective elements 1-1 are connected in series with each other.

In this way, the electrodes 15a-15 are connected through the wiring 16.
The translucent substrate 8 supports the element 1 due to the connection structure between the elements 1-1 for connecting b, and while keeping the distance between the translucent substrate 8 and the element 1 substantially constant, the translucent substrate 8 is It also serves as a light receiving window and a protective cover for the element 1. In this case, the light-transmissive substrate 8 does not necessarily have to be transparent, and may be semi-transparent as long as the base can be seen, and may be clouded or colored. Any material may be used as long as it has optical properties, and for example, polyethylene, polyethylene terephthalate, fluororesin, glass or the like can be used in addition to polystyrene.

As described above, in the above embodiment,
The electrodes 15a and 15b of the element 1 are provided on the light receiving surface 1a side of the element 1, and the translucent substrate 8 has a supporting function of supporting the element 1, and also serves as a light incident window and a protective cover of the element 1. The main feature is that

As a result, for example, as described above with reference to FIGS. 24 and 25, even if the external pressure P is applied to the transparent substrate 8 of the solar cell 10, the transparent substrate 8 is connected to the electrodes 15a-15b or the structure will be described later. Since the convex spacers prevent deformation, the gap between the element 1 and the transparent substrate 8 is always kept constant.

Therefore, in order to prevent the translucent substrate 8 deformed between the connection structure portions from coming into contact with the element 1, it is necessary that the distance between the connection structures of the adjacent electrodes 15a-15b is not too large. Therefore, it is necessary that the size of the element 1 also be adjusted to match the size.

As described above, under the common basic structure of the device, in FIGS. 1 and 2, printing 13 is performed on the back surface of the transparent substrate 8 at the same position as the device 1 to display a predetermined pattern. It is a thing. However, this printing may be provided on the front surface side of the substrate 8 or may be performed on the front surface of the element 1.

First, FIG. 1 shows a first embodiment, and in the case of this embodiment, all the elements 1 are formed to the same standard and a predetermined pattern is printed 13.

Therefore, the principle of the interference color, which will be described later, may be observed for the incident light L on the portion where the printing 13 is not applied.
In the portion where the printing 13 is applied, the incident light L to this portion is reflected at the interface between the substrate 8 and the printing 13.

Therefore, in the portion where the printing 13 is applied, since the reflected light of a specific color is obtained with respect to the portion where the printing 13 is not applied, the pattern color can be observed from the outside, and the objective The design value can be increased. Therefore, in this case, even if the color of the element 1 on the inner side of the substrate 8 cannot be seen, there is no problem and the construction of the design is facilitated.

In this case, although the interference color of the element 1 may be generated, since the reflection at the interface between the substrate 8 and the printing 13 occurs at a position close to the outer surface, only this reflection is observed from the outside. , The difference from the interference color in the non-printed part is remarkable.

FIG. 2 shows the second embodiment, in which the element 1A in the portion where the printing 13 is not applied is formed by thinning the insulating film to thin the entire element.

That is, as shown in FIG. 2 and FIG. 5, in this embodiment, for example, the thickness t ₂ of the insulating film 4 of the specific element 1A is made thinner than the other elements t ₁ and the element 1
A desired pattern is formed by the group A, and the color pattern can be displayed by utilizing the interference color of the light as described later.

That is, as shown in FIGS. 6 (a) and 6 (b), the light L passing through the transparent substrate 8 is absorbed by the light receiving surface 1a of the element 1 to generate a photocurrent. On the transparent substrate 8 side, the reflected light of the incident light L reflected by the light receiving surface 1a and the insulating film 4 can be observed in a pattern due to the interference between L ₁ and L ₂ .

Therefore, in the case of this example, the same phenomenon as in the case of the first embodiment is exhibited, but the interference color of the element in the portion where the printing 13 is not applied is slightly different from that of the first embodiment. Be observed.

Such an interference color is caused by changing the thickness t ₂ of the insulating film 4 of the element 1A on the light receiving surface 1a of each element 1 constituting the solar cell 47, as shown in FIG. This occurs because the insulating film is formed to be thinner than the thickness t ₁ of the insulating film (such an interference color can be created by changing the material of the insulating film 4).
Since the gap between the translucent substrate 8 and the element 1 is kept constant without being deformed, the pattern of the interference color can be always observed, and the design value is the same as that of the first embodiment. Can be increased.

Moreover, the light-transmissive substrate 8 allows the incident light L of the element to be effectively transmitted and sufficiently incident on the element 1, and can be sufficiently exerted without impairing its original performance. Moreover, the substrate 8 has transparency and weather resistance, and can effectively protect the element 1.

That is, the design value of the solar cell can be sufficiently realized, the commercial value of the product can be remarkably increased, and at the same time, the solar cell, which occupies a large proportion of the product, can be easily exposed to light. The problem of exposing the light receiving surface can be solved at once.

FIG. 3 shows a third embodiment, and FIG. 4 shows a fourth embodiment, but as shown in the drawing, the print 13 shown in FIGS. 1 and 2 is not provided, and a part of the substrate 8 (see FIG. 3 is an inner surface side, and FIG. 4 is an outer surface side.
White or colored powder) is mixed in so that the internal element 1 cannot be seen from the outside.

As a result, the light L that has passed through the substrate 8 and is incident is diffused by the diffusing agent 18, and the pattern color due to this diffusing agent is observed from the outside.

Also in this example, if the same printing 13 as in the case of FIGS. 1 and 2 is provided, this printing color is added to the color of the diffusion pattern, and a pattern color different from those of FIGS. 1 and 2 is obtained. I can observe.

FIG. 7 shows an example of the display pattern in the above-mentioned first and second embodiments. The cells in this figure show the element groups of the solar cells in the first and second embodiments. Is consistent with the arrangement.

Therefore, if printing is performed using a mask in which the element group 1B portion is cut out, this pattern can be printed on the surface of the substrate 8 above the elements of the element group 1B.

FIG. 8 is a schematic view showing a method of manufacturing the pattern display by the above printing.

First, as shown in FIG. 8A, a mask 19 having an opening 19a in which the pattern as shown in FIG. 7 is cut out is used. Then, as shown in FIG. For example, a translucent polystyrene resin is screen-printed. Next, if the mask 19 is removed, the print 13 is formed.

FIG. 9 is a partial cross-sectional view of a solar cell according to the fifth embodiment, in which a desired design is made by using, for example, polystyrene resin containing a translucent dye or pigment.
It is formed by screen printing on the surface of.

The print 13 is also printed using the mask having the pattern as shown in FIG. 7, for example. In the print 13, however, interference colors having different tastes can be observed.

Further, as shown in FIG. 10, in the state where the boundary between the patterned and non-patterned elements 1 is overlapped,
For example, the corrugated unevenness 50 is formed by spraying or printing.

As a result, diffuse reflection of incident light on the surface of the unevenness 50 and refraction of light emitted from the surface of the unevenness 50 of the interference color on the reflecting surface 1a of the internally provided element 1 can be added to further change the taste. .

In this embodiment, since the predetermined pattern is displayed by printing on the upper surface of the substrate 8, in order to utilize the interference color as in the above-mentioned example, the insulating film as shown in FIG. Although it is necessary to change the thickness of 4 and the like, but it is not necessary to cause light interference, all the elements 1 can be manufactured in the same manner, which is advantageous for cost reduction. Also,
Such printing may be performed on the surface of the element 1.

In this case, the polystyrene resin may contain a light-transmitting dye or pigment, and the pattern design can be made effective by appropriately selecting a desired color. Further, it is possible to similarly color a portion other than the pattern with a different color, and by applying the background color of the pattern, the pattern can be more effectively expressed.

FIG. 11 is a partial cross-sectional view of a solar cell according to the sixth embodiment. The difference from each of the above-mentioned embodiments is that
That is, no printing or diffusion agent is mixed.

However, as shown in FIG. 5 described above, for example, the element 1A in which the insulating film 4 is thinned to thin the entire element
Is provided to form a predetermined pattern as shown in FIG. 7, for example. Therefore, interference colors different from those of the ordinary element 1 other than this are observed, and the designability can be improved.

FIG. 12 is a partial sectional view of a solar cell according to the seventh embodiment of the present invention, and FIG. 13 is an enlarged sectional view showing a part of FIG.

The solar cell 45 of this embodiment, as shown in the figure,
In addition to the configuration of the sixth embodiment described above, the convex portion 12 is also provided as a spacer, and it is further effective to maintain the gap between the transparent substrate 8 and the element 1 and prevent deformation of the transparent substrate 8. This is what I did.

The convex portion 12 may be formed integrally with the substrate 8 by the same material as the translucent substrate 8, or may be made of a material different from the substrate 8, but the convex portion 12 interferes with light reception. It is important to use a material that is transparent and has a hardness lower than that of the element 1 so that there is no light.

As described above, in the photoelectric conversion element module according to each of the above-described embodiments, since the gap between the element 1 and the substrate 8 is always kept constant, pressure is applied to the light receiving surface while being carried or used. Also, the substrate 8 is not deformed, so that the desired color tone initially set can be maintained.

On the other hand, for comparison, a module in which electrodes and wirings are provided on the opposite side of the light receiving surface of the element (the opposite side of the embodiment) and no measures are taken to keep the gap between the substrate 8 and the element constant. Prepared.

When the respective modules of the present example and the comparative example were arranged side by side and the color tone of the photoelectric conversion element module was examined by applying external pressure, the color tone of the photoelectric conversion module of the present example constructed according to the present invention was examined. about,
The initial clear condition was maintained. On the other hand, in the case of the comparative example, the color tone was almost monotonic as compared with the initial color tone.

Next, an example of the method of manufacturing the solar cell module according to this embodiment will be briefly described.

FIG. 14 shows an example of the manufacturing method.
As shown in FIG. 14A, ITO is deposited on the surface of the transparent substrate 8 by vacuum vapor deposition or nickel, copper, tin or the like is deposited to form the wiring 16. Next, as shown in FIG. 14 (b), silver paste 7 is applied to both ends of the wiring 16 and positioned so that the electrodes 15a and 15b of the separately manufactured elements 1 and 1 are connected in series.

Then, as shown in FIG.
By joining from the state of 14 (b), the electrodes 15a and 15b are adhered to the wiring 7 by the silver paste 7, and the element 1-
1 are connected in series. Then, as shown in FIG.
Each element 1 has a resin 9 (for example, epoxy resin) on the non-electrode side.
It is firmly bonded by molding with.

Further, the solar cell module according to this embodiment can be manufactured by a manufacturing process reverse to that of the manufacturing method shown in FIG. FIG. 15 shows the manufacturing method.

That is, as shown in FIG. 15 (a), first, a group of separately manufactured elements 1 is arranged on the molded resin 9 in a predetermined pattern, and these group of elements 1 are pressed against the resin 9. By doing so, the state shown in FIG. The wiring 16 of the translucent substrate 8 manufactured in the same manner as in the case of FIG. 14 described above is positioned on such an element group 1 as shown in FIG. 15C, and the two are bonded to each other. The shape as shown in (d) can be finished, and the manufacturing can be performed efficiently and easily.

The solar cell module of this embodiment can also be manufactured with a structure as shown in FIG.

That is, the element 1C group to be arranged is provided only on the element 1C on both ends, the electrode 15a 'is provided on one side and the electrode 15a' on the other side.
15b 'is provided, and the elements 1C in the middle are connected by the wiring 11.

Then, the element 1C group formed as described above is arranged on the mold resin 9 as shown in FIG.
As shown in (b), each of the element 1C groups is bonded by being pressed against the resin 9. Then, as shown in FIG. 16 (c),
A light-transmissive substrate 8 having wirings 16 'formed only on both ends is separately prepared, and is placed on the element 1C group prepared as described above, and the electrodes 15a', 15b 'and the wirings 16' are made of silver. Bonding is performed via paste 7.

As a result, the electrodes 15a ', 15 of the device 1C are
b ′ need only be provided on the element 1C on the outermost surface side, and for the element 1C located in the middle, the electrodes 15a ′, 15b ′ need not be installed and a simple wiring 11 is sufficient, thus realizing rationalization of manufacturing. . Note that in FIG. 16C, reference numeral 43 indicates a connection terminal connected to the outside.

FIG. 17 is a schematic view showing a process of integrally molding the convex portion 12 of the transparent substrate 8 according to this embodiment with the substrate 8 by pressing.

That is, FIG. 17A shows the state in which the molding material 8A is placed or poured onto the lower mold 14B having the recess 14a and the upper mold 14A is positioned above the molding material 8A, for example, immediately before press molding. There is. The material 8A pressed by operating the upper mold 14A in the direction of the arrow is integrally formed with the convex portion 12 as shown in FIG. Such a cover can be produced by a mold such as injection molding other than press molding.

FIG. 18 is a cross sectional view schematically showing the step of forming the projection 12 on the substrate 8 by spraying.

That is, FIG. 18 (a) shows an opening for the material 8A.
A situation is shown in which a mask 17 having 17a is hung and a material of the same material as the material 8A is sprayed as shown by the arrow. By this spraying, the convex portion 12 can be formed as shown in FIG. 18 (b).

19 and 20 show a concrete application example of the module of this embodiment described above. FIG. 19 shows an example of a card type portable radio, and FIG. 20 shows an example of an IC card, which are manufactured by the same process as the solar cell according to the present embodiment described above.

First, the card type portable radio 29 shown in FIG. 19 is a case having a switch 22, a tuning adjustment knob 23, a volume adjustment knob 24, and an earphone 26 provided at the tip of the lead wire 25 (details such as speakers are shown. A light receiving window 27 is provided in (omitted), and a solar cell 28 including the module of the above-described element 1 is provided inside the light receiving window 27 as a power source, which may be called a solar radio.

In this case, the solar cell 28 is composed of a group of a large number of elements 21 arranged in a matrix, and this group of elements 21 is an element group 21B and an element group 21A showing a different color from the element group 21B. The characters "50" are represented in color by the above-mentioned printing or the like. For this purpose, for example, as described above, this element group 21A
The substrate 8 may be printed, or the thickness of the insulating film may be thinner than the thickness of the insulating film of the element group 21B (or may be thicker than the thickness).

As a result, the character "50" is represented by the interference color in the light receiving window 27, and the design of the light receiving window 27 can be improved. However, the pattern is not limited to characters, but can be numbers or figures. Good. And, as mentioned above,
Since the gap between the substrate 8 and the light receiving surface of the element 1 is kept constant, the interference color does not change and the expression content is constant.

In the case of the IC card 33 shown in FIG. 20 (details not shown), a light receiving window 31 is provided on the surface of the card 33, and a solar cell 32 composed of a module of the above-mentioned element for power supply is provided inside this. Is provided. Also in this case, the element group 30B and the element group 30A are divided into
For example, a mosaic pattern design is formed by colors such as printing. Since the entire IC card 33 is flexible, the structure of this embodiment is effective.

Therefore, if this IC card is applied to an employee ID card, for example, it becomes possible to record a large amount of information about an individual who has the solar cell 32 as a power source and is built in the IC card 33.

Then, the card type portable radio 29 and the IC card 33 according to the present embodiment and the above-mentioned comparative sample were arranged side by side, and an external pressure was applied to examine the color tone of the photoelectric conversion element module. In the case of the photoelectric conversion element module constructed according to the example, the initial clear color tone could be maintained. Contrary to this, in the case of the comparative sample, compared to the original color tone, it becomes a state that is almost monotonous, and the effect of the convex portion 10 on the back surface of the cover molded based on this example is remarkable. It was appearing.

Although the embodiments of the present invention have been described above, the above-described embodiments can be modified in various ways based on the technical idea of the present invention.

For example, the configuration, shape, and material of each part of the solar cell described above may be other than those in the above-described embodiments. Specifically, in the above-described embodiment, the wiring 16 and the electrodes 15a and 15b or the convex portion 12 are used together to support the element 1, but the concave portion is provided in the substrate 8 to form the wiring 16 and the electrode 15a,
15b may be housed in the recess. In this case, it is possible to adopt a structure in which the substrate 8 and the element 1 are always in contact with each other.

When the convex portion 12 is provided, the shape of the convex portion 12 may be corrugated instead of the point-shaped convex portion as in the above-mentioned embodiment, and the convex portion is always in contact with the element. It does not have to be provided, and it is sufficient if interference is constant. Further, in the above-described embodiment, the convex portion 12 is formed integrally with the substrate 8, but such a convex portion may be provided on the insulating film 4 side, and the substrate 8 is doubled to reinforce the deformation of the substrate 8. It may be a structure.

Further, the material of the insulating film may be a material other than SiO ₂ , for example, Si ₃ N ₄ , and this changes the reflection efficiency and the refractive index, so that it can be expressed in a color different from that of SiO _2. Become. The material of the substrate 8 may be various as described above, and the element 1 may be made of the material described above other than single crystal silicon.

Furthermore, the present invention is not limited to solar cells, but CC
The present invention can also be applied to other photoelectric conversion elements such as D (charge coupled device), photodetector, and photodiode, and LED (light emitting diode) that emits light. In particular, various card-type ICs that are required to be thin The present invention can also be applied to a card, a pager, and a card type information recording / reproducing device that records / reproduces audio or video information.

In particular, various products that can be used while being carried or carried: portable AV equipment such as radio, walkman (headphone stereo), radio cassette, handycam (camera integrated video recorder), etc. Expansion of application is expected.

[0105]

As described above, the present invention provides a plurality of optoelectronic elements and a light-transmitting element which is provided on the outer surface side facing these elements and which supports the elements on the side opposite to the outer surface side. Since the wiring layer having a substrate and for connecting the optoelectronic element is provided on the transparent substrate, the transparent substrate has a supporting function for supporting the element, and the connection and protection of the element. Since it also has the function of a cover, the structure is compact and thin, and the incident light (or emitted light) of the element is effectively transmitted through the translucent substrate, and it is fully demonstrated without impairing the original performance. You can make a child. Moreover, the intended design value can be increased by printing on the translucent substrate.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a part of a solar cell module according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a part of a solar cell module according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a part of a solar cell module according to a third embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a part of a solar cell module according to a fourth embodiment of the present invention.

FIG. 5 is an enlarged view of a portion of FIG.

FIG. 6 is a diagram showing a principle of generating an interference color of light, (a)
Is a schematic sectional view, and (b) is an enlarged view of a part of (a).

FIG. 7 is a diagram showing an example of a pattern displayed on the solar cell.

FIG. 8 is a schematic cross-sectional view of a main part showing the manufacturing process of the solar cell.

FIG. 9 is a schematic sectional view showing a part of a solar cell module according to a fifth embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view of a main part showing a modified example of the solar cell.

FIG. 11 is a schematic sectional view showing a part of a solar cell module according to a sixth embodiment of the present invention.

FIG. 12 is a schematic sectional view showing a part of a solar cell module according to a seventh embodiment of the present invention.

FIG. 13 is an enlarged view of a part of FIG. 12.

FIG. 14 is a schematic cross-sectional view of a main part showing the manufacturing process of the solar cell.

FIG. 15 is a schematic cross-sectional view of a main part showing another manufacturing process.

FIG. 16 is a schematic cross-sectional view of an essential part showing another manufacturing method and the manufacturing process thereof.

FIG. 17 is a schematic cross-sectional view of a main part showing the manufacturing process of the solar cell.

FIG. 18 is a schematic cross-sectional view of a main part showing another manufacturing step of the solar cell.

FIG. 19 is a perspective view of a card-type portable radio to which the solar cell is applied.

FIG. 20 is a front view of an IC card to which the solar cell is applied.

FIG. 21 is a schematic cross-sectional view showing a main part of a solar cell according to a conventional example.

FIG. 22 is a partial cross-sectional view of the solar cell.

FIG. 23 shows a calculator using the same solar cell, (a) is a plan view, and (b) is a partially enlarged view of (a).

FIG. 24 is a schematic cross-sectional view showing a part of the solar cell module.

25 is an enlarged view of a portion of FIG. 24.

[Explanation of symbols]

1, 1C, 21, 30 ... Solar cell element, 2 ... N-type silicon semiconductor, 3 ... P-type silicon semiconductor, 4 ... SiO ₂ insulating film,
7 ... Silver paste, 8 ... Transparent substrate, 9 ... Resin film, 10, 2
0, 28, 32, 45, 46, 47, 48, 49 ... Solar cells, 11, 16 ...
Wiring, 12 ... Convex part, 13 ... Printing, 14 ... Press type, 14a ... Recessed part, 15 ... Electrode, 17, 19 ... Mask, 17a, 19a ... Opening, 18
… Diffusing agent, 27, 31… Light receiving window, 29… Card type portable radio,
33 ... IC card, 43 ... Terminal, 50 ... Uneven surface, L ... Incident light,
L ₁ , L ₂ ... Reflected light, C ... Gap, t ₁ , t ₂ ... Thickness

Claims (32)

[Claims] 1. A plurality of optoelectronic elements,
A light-transmitting substrate provided on the outer surface side facing these elements and supporting the element on the side opposite to the outer surface side, and a wiring layer for connecting the optoelectronic element is provided with the light-transmitting substrate. Optoelectronic device provided on a flexible substrate. 2. A plurality of photoelectric conversion elements, and a translucent substrate provided on the outermost surface side which is a light incident side facing the elements and supporting the elements, the plurality of photoelectric conversion elements. The optoelectronic device according to claim 1, wherein a wiring layer for interconnecting elements is provided on the translucent substrate. 3. The optoelectronic device according to claim 1, wherein the electrodes of the plurality of optoelectronic elements are electrically connected to each other through a wiring layer of the transparent substrate. 4. A light-transmitting substrate provided on the light-receiving surface side of an optoelectronic element, a light incident window, a protective cover, and a support plate for interconnecting a plurality of photoelectric conversion elements and supporting them. The optoelectronic device according to claim 1, which also functions as a device. 5. The optoelectronic device according to claim 1, wherein a predetermined pattern is externally presented by printing. 6. The optoelectronic device according to claim 5, wherein the printing is performed on the light receiving surface side of the translucent substrate and / or the opposite side. 7. The optoelectronic device according to claim 5, wherein the printing is made of a translucent material. 8. The optoelectronic device according to claim 1, wherein a light diffusing agent is held on the transparent substrate. 9. The optoelectronic device according to claim 1, wherein a light diffusion structure is formed on the translucent substrate. 10. The optoelectronic device according to claim 1, wherein a spacer is arranged between the transparent substrate and the optoelectronic element. 11. The optoelectronic device according to claim 10, wherein the spacer is formed of a material having a hardness lower than that of the optoelectronic element. 12. The optoelectronic device according to claim 11, wherein the translucent substrate and the spacer are integrally formed of resin. 13. The optoelectronic device according to claim 1, wherein the translucent substrate is made of an inorganic material. 14. The optoelectronic device according to claim 10, wherein the plurality of spacers are formed by unevenness. 15. The optoelectronic device according to claim 1, wherein a predetermined element of the plurality of optoelectronic elements externally presents a pattern due to interference of light through the transparent substrate. 16. The optoelectronic device according to claim 1, wherein the plurality of optoelectronic elements are coupled to each other by a protective resin on the side opposite to the transparent substrate. 17. A plurality of optoelectronic elements,
A light-transmitting substrate provided on the outer surface side facing these elements and supporting the element on the side opposite to the outer surface side, and a wiring layer for connecting the optoelectronic element is provided with the light-transmitting substrate. A method for manufacturing an optoelectronic device, comprising: fixing an electrode of the optoelectronic element to the wiring layer of the translucent substrate and electrically connecting the electrodes when manufacturing the optoelectronic device provided on the transparent substrate. 18. A light-transmitting substrate provided on a light-receiving surface side of a plurality of photoelectric conversion elements, a light incident window, a protective cover, interconnection between the plurality of photoelectric conversion elements, and a support for supporting them. 18. The manufacturing method according to claim 17, wherein the manufacturing method also functions as a plate. 19. The manufacturing method according to claim 17, wherein a predetermined pattern is visually exhibited by printing. 20. The manufacturing method according to claim 19, wherein printing is performed on the light-receiving surface side of the translucent substrate and / or the opposite side. 21. The manufacturing method according to claim 19, wherein printing is performed using a translucent material. 22. A light diffusing agent is held on a transparent substrate,
The manufacturing method according to claim 17. 23. The manufacturing method according to claim 17, wherein a light diffusion structure is formed on the translucent substrate. 24. The manufacturing method according to claim 17, wherein a spacer is arranged between the transparent substrate and the optoelectronic element. 25. The manufacturing method according to claim 24, wherein the spacer is formed of a material having a hardness lower than that of the optoelectronic element. 26. The manufacturing method according to claim 25, wherein the translucent substrate and the spacer are integrally formed of resin. 27. The transparent substrate is formed of an inorganic material.
The manufacturing method described in 17. 28. The manufacturing method according to claim 24, wherein the plurality of spacers are formed by unevenness. 29. The manufacturing method according to claim 17, wherein a predetermined element among the plurality of optoelectronic elements is caused to visually exhibit a pattern due to light interference through the transparent substrate. 30. The manufacturing method according to claim 17, wherein a plurality of optoelectronic elements are bonded to each other by a protective resin on the side opposite to the transparent substrate. 31. An information recording and / or reproducing apparatus having the optoelectronic device according to claim 1 on an outer surface side. 32. The information recording and / or reproducing apparatus according to claim 31, which is a thin radio receiver or an IC card.