JP2014096439A - Electrode lead-out structure of organic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that it is general to connect a portion to be connected with solder while using a lead wire or an FPC, as a method of connecting an electrode of a photoelectric conversion element and an external electrode, and improvement of a photoelectric conversion efficiency is required especially in the case a small power organic photoelectric conversion element is used.SOLUTION: By sandwiching a lead-out electrode 11 of a photoelectric conversion element 10 composed of organic semiconductor layers laminated between paired facing transparent electrode 10a and negative electrode 10e, with an edge cover 131 composed of an insulating material and a connector 13 provided with a conductive part 132 composed of a conductive material inside of the edge cover to electrically connect the electrode 11 therewith, the electrode lead-out structure of an organic device 1 having a high photoelectric conversion efficiency is achieved.

Description

  In the present invention, an extraction electrode for an organic photoelectric conversion element formed on a transparent substrate is provided at the peripheral end of the transparent substrate, and the electrode is taken out by sandwiching the peripheral end of the transparent substrate with a pair of connectors having conductive portions. The present invention relates to an electrode extraction structure for an organic device.

  In recent years, with the growing interest in solar energy, which is clean energy, the development of photoelectric conversion elements has been remarkable. A photoelectric conversion element is an element that converts light energy into electrical energy, and vice versa.

  As a direct conversion of light energy to electrical energy, solar cells are growing rapidly. In particular, organic solar cells that are inexpensive, lightweight, and flexible are attracting attention as next-generation solar cells. Improvements in organic materials and manufacturing methods are ongoing, and high-efficiency organic solar cells having a photoelectric conversion efficiency of 8% or more have been realized. Moreover, there exists an organic EL (Electro Luminescence) element as what converts an electrical energy into a light energy. Organic EL devices have been supplied to the market as display devices and illumination light sources from the viewpoint of energy saving.

  In Patent Document 1, as shown in FIG. 7, a light emitting portion 57 in which a light emitting layer 54 and a dielectric layer 55 are sandwiched between a transparent electrode 53 and a back electrode 56 is integrally formed on a lower glass substrate 52. The EL 50 is shown in which a pair of upper and lower glass substrates 51 and 52 are welded and joined with a sealing member 59. A through hole 51a is formed in the upper glass substrate, a paste coating / firing film 60 is formed on the inner diameter portion of the through hole, and a laminated vapor deposition film 61 is applied to the upper surface of the upper glass substrate in the vicinity of the through hole. Is flowed into the through-hole 51a to form a solder portion 62 that is electrically connected to the extraction electrode 58 of the light emitting portion 57, and a lead wire (not shown) is attached to the solder portion 62 to be connected to an external electrode. That is, good adhesion between the solder and the glass substrate 51 is realized by the paste application / fired film 60 and the laminated vapor deposition film 61 provided in the through hole.

  In Patent Document 2, as shown in FIG. 8, at least one is a transparent surface material 70, and the other surface material is sandwiched between a laminate 71, which is a display device or a solar cell module, and the transparent surface material and the laminate. An apparatus having a layered portion 72 and a flexible printed circuit board 73 (flexible printed circuit, hereinafter abbreviated as FPC) for transmitting an electrical signal connected to the outer peripheral portion of the laminate is shown.

  In the structure described above, soldering is required when electrically connecting to the external electrode, but the solder is difficult to adhere to a glass substrate or a plastic substrate. When FPC is used for connection to the external electrode, the connection can be made by thermocompression bonding, but the transparent electrode is weak against heat. Therefore, an extraction electrode structure that can reliably connect the external electrode and the organic device is sought as follows.

JP 2000-243559 A JP 2012-158688 A

  The organic devices using the above-described photoelectric conversion elements are not limited to indoor use, but are used in natural environments, such as lighting for road signs, etc., and improvements in photoelectric conversion efficiency and durability have been promoted. It has been.

  However, in a structure in which a lead wire or FPC is used for connection between the electrode of the photoelectric conversion element and the external electrode, the connection part is always a point connection by soldering. Then, since the electrical resistance of the transparent electrode in the photoelectric conversion element surface to a connection site | part is large, a voltage drop arises in connection with it. For general electronic components, the decrease in efficiency due to a voltage drop is negligible, but organic photoelectric conversion elements have extremely low power, so such a voltage drop has a significant effect on photoelectric conversion efficiency. There is a point.

  In addition, when solder is used as the adhesive, there is a problem that the solder is difficult to adhere to the transparent electrode on the glass substrate or the plastic substrate. Therefore, an extra step of providing a base layer in advance on the transparent electrode in order to improve the adhesion of solder is required.

  Furthermore, when using solder, the transparent electrode formed on the upper surface of a glass substrate or the like is vulnerable to heat, so the film is deformed by heating at the time of fixing or the electrode of the transparent electrode is easily peeled off. There is also a problem that many defects occur.

  Furthermore, when using FPC, it is necessary to replace the FPC at the time of replacement. However, since FPC is expensive, there is a problem that the merit of using an inexpensive organic photoelectric conversion element is reduced.

  The present invention has been made in view of the above problems, and has an electrode extraction structure for an organic device that can minimize electrical resistance for extraction within the surface of a photoelectric conversion element and can reliably realize electrical connection. It is to provide.

  According to the present invention, a transparent substrate, a transparent electrode serving as an anode provided on the transparent substrate, a cathode disposed opposite to the transparent electrode, and an organic semiconductor layer laminated between the anode and the cathode An extraction device provided at a peripheral edge of the transparent substrate, a sealing substrate for sealing the organic device, an edge cover made of an insulating material, and an inner side of the edge cover A connector having a conductive portion of a pair of conductive materials provided, the extraction electrode disposed on the outer periphery of the transparent substrate is sandwiched by the connector, and the extraction electrode and the conductive portion are pressed to contact each other. It is characterized by taking out.

  According to the invention, a plurality of the extraction electrodes are continuously formed in the peripheral direction of the transparent substrate in the length direction of the transparent substrate.

  Further, according to the present invention, the extraction electrode is routed around the back surface of the transparent substrate.

  Furthermore, according to the present invention, the edge cover is formed of a material having rigidity or strength.

  Furthermore, according to the present invention, the transparent substrate is a glass substrate or a flexible material.

  Furthermore, according to the present invention, a transparent substrate, a transparent electrode serving as an anode provided on the transparent substrate, a cathode disposed opposite to the transparent electrode, and an organic layer laminated between the anode and the cathode An organic device comprising a semiconductor layer, an extraction electrode provided at a peripheral end of the transparent substrate, an insulating member covering a part of the extraction electrode, a sealing substrate for sealing the organic device, An edge cover made of an insulating material and a connector having a conductive portion of a pair of conductive materials provided inside the edge cover, the extraction electrode disposed on the outer periphery of the transparent substrate being sandwiched by the connector The electrode is taken out by press-contacting the extraction electrode and the conductive portion.

  According to the electrode take-out structure of the organic device of the present invention, the following effects can be obtained.

  1stly, the photoelectric conversion element which laminated | stacked the positive hole transport layer and the electric power generation layer between the transparent electrode provided on the transparent substrate and the cathode arrange | positioned facing the said transparent electrode is sealed with a sealing substrate, The said sealing substrate The electrode of the organic device can be taken out by a structure in which the extraction electrode provided on the outer peripheral portion of the transparent substrate is sandwiched and pressed by a pair of conductive portions provided on the inner side of the edge cover of the connector.

  As a result, electrical connection is possible by simply bringing the conductive portion into pressure contact with the extraction electrode, so that soldering is unnecessary. In addition, since the wiring part of the organic device is covered with the edge cover of the connector, it is not visible from the outside, so that the disorder due to the wiring is eliminated and the design is excellent.

  Second, the extraction electrode of the photoelectric conversion element is formed continuously in the length direction of the transparent substrate, and the conductive portion of the connector is formed in the length direction of the edge cover. It can be electrically connected at multiple points simply by sandwiching with and pressing the conductive portion.

  Thereby, a resistance component becomes small. That is, since the same effect as in the case of parallel connection can be obtained, the electrical resistance value of the transparent electrode in the photoelectric conversion element surface can be minimized, and the extraction voltage and current can be increased. Specifically, in the case of organic EL, the light emission electromotive force can be increased, and in the case of an organic solar cell, the conversion efficiency from light energy to electric energy is increased, and the amount of power generation can be increased.

  In addition, since electrical connection can be made at multiple points, reliable electrical connection can be provided at the remaining normal connection sites even if a failure or contact failure occurs due to deterioration of a connection site. As a result, the probability of failure due to the deterioration of the connection site can be greatly reduced.

  Third, since the connector is provided with a conductive portion of a pair of conductive materials inside the edge cover made of an insulating material, one is an anode and the other is a cathode. As a result, it is possible to easily realize electrical connection simply by sandwiching the electrode portion of the transparent substrate, and it is not necessary to check the anode and the cathode. That is, no positioning or soldering is required at the time of mounting the connector, and the connector can be easily attached and detached, so that the operation of connecting the connector becomes easy. As a result, the heating step by soldering can be omitted, and there is no possibility of adversely affecting the characteristics of the organic device. Moreover, it leads to the cost reduction of capital investment.

  Further, unlike an expensive FPC, the structure is made by attaching a conductive material such as conductive rubber to an insulating material such as plastic, which leads to cost reduction.

  Fourth, since the peripheral end portion of the organic device is sandwiched by the connector, the transparent substrate can be mechanically supported by the connector.

  Fifth, since the extraction electrode provided at the peripheral end of the transparent substrate of the photoelectric conversion element only needs to be sandwiched by the connector having the conductive portion, it can accommodate various substrate sizes.

It is (A) top view and (B) sectional drawing of the organic device in embodiment of this invention. (A) The top view explaining one Embodiment of the photoelectric conversion element used for this invention, (B) It is sectional drawing of the organic device which sealed the photoelectric conversion element. (A) The top view explaining other embodiment of the photoelectric conversion element used for this invention, (B) It is sectional drawing of the organic device which sealed the photoelectric conversion element. (A) The top view of a long type connector used for this invention, (B) The side view, (C) The top view of a short type connector, (D) The side view. (A) The top view of the organic device which shows the other connection example of the connector of this invention, (B) The top view of the connector. (A)-(F) are sectional drawings explaining the manufacturing process of the organic device of this invention. It is sectional drawing explaining the connection method of the conventional photoelectric conversion apparatus. It is sectional drawing explaining the connection method of the conventional photoelectric conversion apparatus.

  With reference to FIGS. 1 to 5, an embodiment of an electrode extraction structure for an organic device of the present invention will be described.

  1A is a top view of the organic device of the present invention, and FIG. 1B is a cross-sectional view taken along the line aa of FIG. 2A is a top view showing one embodiment of the photoelectric conversion element used in the present invention, and FIG. 2B is a cross-sectional view taken along the line aa of FIG. 2A of the organic device in which the photoelectric conversion element is sealed. FIG. FIG. 3 (A) is a top view showing another embodiment of the photoelectric conversion element used in the present invention, and FIG. 3 (B) is an aa line in FIG. 3 (A) of the organic device sealing it. It is sectional drawing. 4 (A) is a plan view of the long connector shown in FIG. 1 (A), FIG. 4 (B) is a side view thereof, and FIG. 4 (C) is a plan view of the short connector. FIG. 4D is a side view thereof. FIG. 5A is a top view of an organic device showing another connection example of the connector of the present invention, and FIG. 5B is a plan view of the connector.

  As shown in FIG. 1A, the organic device 1 according to this embodiment includes at least a photoelectric conversion element 10, an extraction electrode 11, a sealing substrate 12, and a connector 13.

  The organic device 1 is a device in which an organic photoelectric conversion element 10 is sealed in a sealing substrate 12 and an extraction electrode 11 of the photoelectric conversion element is sandwiched between connectors 13 to be electrically connected. be able to. In this embodiment, as an example, it functions as an organic solar cell or an organic EL element. Specifically, the size of the organic device 1 is 100 mm × 100 mm, and the thickness t1 is 1 to 1.5 mm. The size of the organic device can be arbitrarily selected according to the capability and size of the built-in photoelectric conversion element.

  As shown in FIG. 1B, the photoelectric conversion element 10 is formed on a transparent substrate 10a and has a structure in which organic semiconductor layers 10c and 10d are stacked between a pair of electrodes 10b and 10e, and light energy is converted into electric energy. An element that converts electric energy into light energy, and vice versa. An element that converts light energy into electric energy is an organic solar cell, and an element that converts electric energy into light energy is an organic EL element. In this embodiment, an organic solar cell is used as an example.

  The photoelectric conversion element will be described in detail with reference to FIGS.

  The extraction electrode 11 is connected to the anode and the cathode of the photoelectric conversion element 10 and is electrically connected to a conductive portion 132 of the connector 13 described later. The extraction electrode 11 includes an extraction base electrode 11a formed by previously patterning the transparent electrode 10b on the transparent substrate 10a, and an extraction contact electrode that overlaps and contacts the extraction base electrode 11a and extends to the back surface of the transparent substrate 10a. 11b. The extraction base electrode 11a is formed by patterning the transparent electrode 10b at the peripheral edge of the transparent substrate 10a. The extraction contact electrode 11b is formed of a highly conductive metal foil such as copper, and is fixed to each extraction base electrode 11a with an anisotropic conductive adhesive, and with the anisotropic conductive adhesive to the side surface and the back surface of the transparent substrate 10a. It is fixed and extended. Therefore, a pattern similar to the extraction base electrode 11a is also formed on the back surface of the transparent substrate 10a. When an anisotropic conductive adhesive is used, the extraction base electrode 11a and the extraction contact electrode 11b are maintained in electrical conductivity and insulated at other portions.

  Note that the extraction contact electrode 11b may be other than a highly conductive metal foil, and may be made by applying a conductive paste such as a silver paste.

  Since the extraction contact electrode 11b always extends from the front surface to the back surface of the transparent substrate 10a, the anode and the cathode are short-circuited by the pair of conductive portions 132 when sandwiched by the connector 13. In order to prevent a short circuit, all the cathodes on the surface of the transparent substrate 10a are covered with the insulating member 15, and only the anode on the surface of the transparent substrate 10a is in electrical contact with the conductive portion 132 of the connector on the surface side of the transparent substrate 10a. Accordingly, the conductive portion 132 on the front surface side of the transparent substrate 10 a takes out the anode and is routed to the external lead-out electrode 14.

  Further, the anode on the back surface of the transparent substrate 10a is entirely covered with the insulating member 15, and only the cathode on the back surface of the transparent substrate 10a is in electrical contact with the conductive portion 132 of the connector on the back surface side of the transparent substrate 10a. Therefore, the conductive portion 132 on the back surface side of the transparent substrate 10 a takes out the cathode and is routed to the external lead-out electrode 14.

  The sealing substrate 12 functions as a protective substrate for the photoelectric conversion element 10 and is an insulating substrate such as a plastic substrate such as polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyester, polyimide resin, epoxy resin, or fluorine resin, or a glass substrate. Note that a hygroscopic agent may be provided at a position facing the photoelectric conversion element 10 inside the sealing substrate 12. The hygroscopic agent is for preventing deterioration of the element due to moisture or moisture.

  In this embodiment, as an example, sealing is performed using a glass substrate. Specifically, the size of the sealing substrate 12 is 94 mm × 94 mm, and the height h1 is about 400 μm to 700 μm.

  The connector 13 includes an edge cover 131 and a pair of conductive portions 132 that are bonded to the inner side of the edge cover 131 and sandwich the peripheral end portion of the transparent substrate 10a. The conductive portion 132 provided inside the edge cover of the connector is electrically connected by being in pressure contact with the extraction contact electrode 11b of the extraction electrode 11. The selection of the anode or the cathode is selected depending on whether it is covered with the insulating member 15 or exposed.

  The connector 13 also serves as a protective cover for the photoelectric conversion element and the wiring portion. When the edge cover 131 made of a non-transparent material is used, the wiring portion of the organic device 1 can be hidden.

  The connector will be described in detail with reference to FIG.

  The external lead-out electrode 14 is an electrode extending from one end of the conductive portion 132 of the connector 13 and is electrically connected to an external electrode (not shown). The external lead electrode 14 is formed of the same material as that of the conductive portion 132. In the present embodiment, the external lead-out electrode 14 is formed in the lower right portion of the organic device 1 as shown in FIG.

  Next, the photoelectric conversion element of this invention is demonstrated in detail using FIG. 2 and FIG. Here, an organic solar cell is used.

  The photoelectric conversion element 10 used in the present invention includes a transparent substrate 10a, a transparent electrode 10b, a hole transport layer 10c, a power generation layer 10d, and a cathode 10e. The transparent electrode 10b and the cathode 10e constitute a pair of electrodes.

  In the transparent substrate 10a, one main surface is used as a sunlight incident surface, and the opposite main surface is used as a support substrate for the transparent electrode 10b. The transparent substrate is an insulating substrate such as a plastic substrate such as polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyester, polyimide resin, epoxy resin, or fluorine resin, or a glass substrate. A flexible film substrate may be used.

  In this embodiment, a transparent glass substrate is used as an example. Specifically, the transparent glass substrate is 100 mm × 100 mm, and its thickness t2 is about 400 μm to 700 μm.

  The transparent electrode 10b is a transparent electrode film formed on almost the entire upper surface of the transparent substrate 10a. As the transparent electrode, indium tin oxide (ITO), indium zinc oxide (IZO), or the like on which indium oxide or the like is deposited is used.

  In the present embodiment, as an example, an ITO film is used, and the peripheral end portion of the transparent substrate 10a is patterned and formed on substantially the entire surface. Specifically, the anode of the photoelectric conversion element is formed in a rectangular shape in a portion excluding the peripheral end portion of the transparent substrate, and the extraction base electrode 11a is formed in the peripheral end portion of the transparent substrate. The film thickness of the ITO film can be arbitrarily determined depending on the current capacity of the organic device.

The hole transport layer 10c is an organic layer that transports holes to the power generation layer, and is formed in a desired shape on the upper surface of the anode of the photoelectric conversion element. Polyethylene geoside thiophene (PEDOT), molybdenum trioxide (MoO ₃ ), or the like is used for the hole transport layer. When PEDOT is used, the film is formed by spin coating. When MoO ₃ is used, the film is formed by vacuum evaporation.

  In the present embodiment, as an example, PEDOT is formed. Specifically, the transparent electrode 10b is formed in a rectangular shape on the upper surface of the anode of the photoelectric conversion element, and the thickness of the hole transport layer is 40 nm.

The power generation layer 10d is a layer that absorbs sunlight to generate power, that is, a photoelectric conversion layer, and is formed on almost the entire upper surface of the hole transport layer 10c. For the photoelectric layer, poly (3-hexylthiophene) (hereinafter abbreviated as P3HT), which is a kind of conductive polymer material, or squarylium derivatives, [60] PCBM ([6,6]- A mixture of phenyl C ₆₁ butyric acid methyl ester) or [70] PCBM ([6,6] -phenyl C ₇₁ butyric acid methyl ester) is used. When a mixture of P3HT and [60] PCBM is used, a solution dissolved in orthodichlorobenzene is applied by spin coating or by vacuum deposition. When a mixture of squarylium derivative and [70] PCMB is used, a solution dissolved in chloroform is formed by coating using a die coater or capillary coater, or by vacuum deposition.

  In the present embodiment, as an example, a mixture of P3HT and [60] PCBM is used. Specifically, it is formed on almost the entire upper surface of the hole transport layer 10c, and the thickness of the power generation layer is 60 nm.

  The cathode 10e is an electrode for collecting holes generated in the power generation layer, and is formed on the upper surface of the power generation layer 10d. Ca, Al, or the like is used for the cathode, and it is formed by vapor deposition, sputtering, coating, or the like. At this time, a transparent solar cell element can be formed by controlling the material used and the film thickness.

  In the present embodiment, as an example, Al is used and formed by vacuum deposition. Specifically, it is formed on the upper surface of the power generation layer 10d, and the thickness of the cathode is 100 nm.

  The cell pattern of the organic solar battery can be variously adapted according to the application object. Here, as an example, a case where eight 10 mm × 85 mm organic solar cells are arranged (FIG. 2) and a case where one 80 mm × 80 mm organic solar cell is arranged in the center (FIG. 3) will be described. To do.

  FIG. 2A shows a photoelectric conversion element 10 in which eight cells of an organic solar battery of 10 mm × 85 mm are arranged. Specifically, the transparent substrate 10a uses a 100 mm × 100 mm transparent glass substrate, and the thickness t2 thereof is 400 μm. The transparent electrode 10b is patterned in advance, and the anode portion of the organic solar battery of each cell is formed in a rectangular shape of 10 mm × 85 mm, and anode and cathode extraction base electrodes 11a are formed at both ends. The hole transport layer 10c and the power generation layer 10d are each formed in a rectangular shape of 10 mm × 85 mm. The cathode 10e is formed in a 10 mm × 85 mm rectangular shape, and is electrically connected to the cathode of the extraction base electrode 11a. The thickness t1 of the organic device 1 is 1 mm.

  Further, as shown in FIG. 2B, the anode and cathode of the extraction base electrode 11a are routed to the back surface of the transparent substrate 10a by the extraction contact electrode 11b.

  Since the extraction contact electrode 11b always extends from the front surface to the back surface of the transparent substrate 10a, the anode and the cathode are short-circuited by the pair of conductive portions 132 when sandwiched by the connector 13. In order to prevent a short circuit, all the cathodes on the surface of the transparent substrate 10a are covered with the insulating member 15, and only the anode on the surface of the transparent substrate 10a is in electrical contact with the conductive portion 132 of the connector 13 on the surface side of the transparent substrate 10a. Therefore, the conductive portion 132 on the surface side of the transparent substrate 10a takes out the anode and is routed to the external lead-out electrode.

  Further, the anode on the back surface of the transparent substrate 10a is covered with the insulating member 15, and only the cathode on the back surface of the transparent substrate 10a is in electrical contact with the conductive portion 132 of the connector 13 on the back surface side of the transparent substrate 10a. Therefore, the conductive portion 132 on the back surface side of the transparent substrate 10a takes out the cathode and is routed to the external lead-out electrode.

  As shown in FIG. 2A, eight 10 mm × 85 mm organic solar battery cells are arranged side by side, so that a plurality of anodes and cathodes of the extraction contact electrode 11b are alternately provided. In the drawing, the portion where the extraction contact electrode 11b is exposed (shaded portion) is the anode, and the portion where the insulating member 15 is exposed (blackened portion) is the cathode. Thus, by providing a plurality of electrodes, when electrically connected by the connector 13, the same effect as in the case of parallel connection can be obtained. That is, the electrical resistance value of the transparent electrode 10b in the photoelectric conversion element surface can be minimized, and the extraction voltage and current can be increased. Therefore, since the photoelectric conversion amount increases, an increase in the luminance factor can be realized in the case of a low-power organic solar cell.

  In addition, since the connection is multi-point, even if a certain connection part is deteriorated and a failure or contact failure occurs, reliable electrical connection can be realized at the remaining normal connection parts. As a result, the probability of failure due to deterioration of the connection site is greatly reduced.

  FIG. 3A shows a photoelectric conversion element in which a cell of an 80 mm × 80 mm organic solar battery is arranged in the center. Specifically, a transparent glass substrate of 100 mm × 100 mm is used as the transparent substrate 10a, and the plate thickness t2 is 700 μm. The transparent electrode 10b is patterned in advance, the anode portion of the organic solar cell is formed in a rectangular shape of 80 mm × 80 mm, and the anode and cathode extraction base electrodes 11a are formed on both ends, respectively. The hole transport layer 10c and the power generation layer 10d are each formed in a rectangular shape of 80 mm × 80 mm. The cathode 10e is formed in a rectangular shape of 80 mm × 80 mm, and is electrically connected to the cathode of the extraction base electrode 11a. The thickness t1 of the organic device is 1.5 mm.

  Further, as shown in FIG. 3B, the anode and the cathode of the extraction contact electrode 11b are routed around the back surface of the transparent substrate 10a by the extraction contact electrode 11b.

  Since the extraction contact electrode 11b always extends from the front surface to the back surface of the transparent substrate 10a, the anode and the cathode are short-circuited by the pair of conductive portions 132 when sandwiched by the connector 13. In order to prevent a short circuit, all the cathodes on the surface of the transparent substrate 10a are covered with the insulating member 15, and only the anode on the surface of the transparent substrate 10a is in electrical contact with the conductive portion 132 of the connector on the surface side of the transparent substrate 10a. Therefore, the conductive portion 132 on the surface side of the transparent substrate 10a takes out the anode and is routed to the external lead-out electrode.

  Further, all the anodes on the back surface of the transparent substrate 10a are covered with the insulating member 15, and only the cathode on the back surface of the transparent substrate 10a is in electrical contact with the conductive portion 132 of the connector on the back surface side of the transparent substrate 10a. Therefore, the conductive portion 132 on the back surface side of the transparent substrate 10a takes out the cathode and is routed to the external lead-out electrode.

  In addition, the number of anodes and cathodes of the extraction electrode 11 can be selected as appropriate. Further, the extraction electrode 11 is not limited to being formed on the two sides of the transparent substrate 10a, but may be formed on the four sides of the transparent substrate 10a.

  Next, the connector of this invention is demonstrated using FIG.

  As shown in FIGS. 4A to 4D, the connector 13 is bonded to an edge cover 131 made of a non-conductive material such as plastic and a surface that sandwiches the photoelectric conversion element inside the edge cover. And a pair of conductive portions 132 provided.

  The edge cover 131 is a cover that sandwiches the transparent substrate 10a of the photoelectric conversion element, and is also a cover that covers the wiring portion. It also serves as a cover that protects the photoelectric conversion element from external damage. Accordingly, it is sufficient that the transparent substrate 10a or the extraction electrode 11 of the photoelectric conversion element is sandwiched and fixed, and it is preferable to use a plastic material.

  Further, the shape of the edge cover is formed in a rectangle having a long side in the length direction of the transparent substrate 10a as shown in the plan views of FIGS. Further, as can be seen from the side views shown in FIGS. 4B and 4D, the tip is slightly narrowed, and the cross section is formed in a substantially U-shape of Katakana. In addition, a sharp portion may be removed and rounded so as to withstand external pressure, and for example, the cross section may be formed in a substantially C shape (not shown) of English letters.

  The conductive portion 132 is formed of conductive rubber obtained by mixing carbon in resin, and is fixed to the back side of the edge cover 131 with an adhesive or the like. An arbitrary length is appropriately selected as the length of the conductive portion. Electrical connection can be made by press-contacting the extraction electrode 11 of the photoelectric conversion element and the conductive portion 132. A major feature of the connector of the present invention is that a pair of conductive portions 132 are provided on the holding surface of the connector, so that one becomes an anode and the other becomes a cathode, so that an electrical connection can be easily made only by holding the extraction electrode 11. It is possible to eliminate the need for soldering.

  In addition, since a rubber material is used for the portion in contact with the photoelectric conversion element, there is no risk of damaging the transparent substrate 10a and the extraction electrode 11 due to the clamping pressure, and the cushioning property prevents the displacement.

  According to the connector of the present invention, there are various ways of attaching the connector. As an example, the attachment method shown in FIG. 1 (A) and the attachment method shown in FIG. 5 (A) will be described.

  In the case of attaching the connector 13 shown in FIG. 1 (A), two long connectors 13a shown in FIG. 4 (A) and two short connectors 13b shown in FIG. 4 (C) are used. Adjacent long connector 13a and short connector 13b are brought into conduction by overlapping the respective conductive portions 132.

  As illustrated, the short connector 13 b is provided with the conductive portion 132 longer than the length of the edge cover 131, and the long connector 13 a is provided with the conductive portion 132 shorter than the length of the edge cover 131. After sandwiching a pair of sides of the transparent substrate 10a with the short connector 13b, the adjacent sides are sandwiched with the long connector 13a, so that the conductive portions of the connectors overlap and are electrically connected. Accordingly, the conductive portion 132 on the front surface side of the transparent substrate 10a takes out the anode, and the conductive portion 132 on the back surface side of the transparent substrate 10a takes out the cathode and is routed to the external lead-out electrode 14. The external lead-out electrode 14 is provided at one end of the conductive portion 132 of one long connector 13a.

  In the case of attaching the connector 13 shown in FIG. 5A, four connectors 13c having the same shape shown in FIG. 5B are used. By projecting the conductive portion 132 only at one end side of the edge cover 131, the conductive portions of adjacent connectors are overlapped and electrically connected. Accordingly, the conductive portion 132 on the front surface side of the transparent substrate 10a takes out the anode, and the conductive portion 132 on the back surface side of the transparent substrate 10a takes out the cathode and is routed to the external lead-out electrode 14. As shown in the figure, the external lead-out electrode 14 is provided on one connector 13c.

  A feature of the present invention is that the extraction electrode 11 of the photoelectric conversion element and the conductive portion 132 of the connector 13 are brought into multipoint contact over a wide range. This is fundamentally different from a so-called point contact connection structure in which a conventional photoelectric conversion element electrode and extraction electrode are electrically connected by solder using a lead wire or FPC.

  That is, since the connection between the extraction electrode of the photoelectric conversion element and the connector is “multi-point contact”, the same effect as in the case of parallel connection can be obtained, and the electric resistance value in the surface of the photoelectric conversion element can be surely minimized. And the effect which enlarges the voltage or electric current concerning a photoelectric conversion element is acquired. As a result, it is possible to increase the photoelectric conversion efficiency of the organic photoelectric conversion element with low power.

  Moreover, the probability of a failure due to partial deterioration of the connection site can be reduced by using multipoint contact.

  Furthermore, since it is only necessary to press-contact the connector 13 to which the conductive portion 132 is adhered and the extraction electrode 11, it is possible to provide a simple organic device connection at low cost.

  Next, the manufacturing process of the organic device of this invention is demonstrated using FIG. In addition, an organic device seals the organic solar cell of FIG. 2 (A).

  6A to 6F are cross-sectional views for explaining the first to sixth steps.

As shown in FIG. 6A, the first step is a step of preparing a glass substrate 10a on which the transparent electrode 10b is patterned. The glass substrate is cleaned and the surface is modified. Specifically, UV / O ₃ treatment is performed on the surface of the glass substrate.

  In the second step, as shown in FIG. 6B, a hole transport layer 10c is formed on the upper surface of the transparent electrode 10b. Specifically, PEDOT is formed by coating to a thickness of 40 nm by spin coating.

  In the third step, as shown in FIG. 6C, a power generation layer 10d is formed on the upper surface of the hole transport layer 10c. Specifically, a solution in which a mixture of P3HT and [60] PCBM is dissolved in orthodichlorobenzene is applied by spin coating to a thickness of 60 nm, or formed by vacuum deposition.

  In the fourth step, as shown in FIG. 6D, the cathode layer 10e is formed on the upper surface of the power generation layer 10d. Specifically, Al is formed by vacuum deposition. Specifically, the film is formed to a thickness of 100 nm. In addition, it can replace with Al and it can be set as a transparent solar cell element by using Ag or controlling a film thickness.

  In addition, when drawing out the anode and cathode of the extraction contact electrode 11b on the back surface of the transparent substrate 10a, it is performed after this step. Moreover, the process of forming the insulating member 15 in the cathode or anode of the extraction contact electrode 11b is performed.

  In the fifth step, as shown in FIG. 6E, a hygroscopic agent is attached to the back surface of the sealing glass substrate 12 at a position facing the photoelectric conversion element 10, and the photoelectric conversion element is sealed with the sealing glass substrate 12. To do. Note that a hygroscopic agent may be formed at a desired position on the sealing glass substrate.

  In the sixth step, as shown in FIG. 6F, the connector 13 holds the four sides of the photoelectric conversion element 10 and electrically connects the conductive portion 132 of the connector and the extraction electrode 11 of the photoelectric conversion element. .

  The organic device 1 of the present embodiment can be used alone as illumination, or attached to a window, a wall, or the like as a retrofit illumination or organic solar cell.

DESCRIPTION OF SYMBOLS 1 Organic device 10 Photoelectric conversion element 10a Transparent substrate 10b Transparent electrode 10c Hole transport layer 10d Power generation layer 10e Cathode 11 Extraction electrode 11a Extraction base electrode 11b Extraction contact electrode 12 Sealing substrate 13 Connector 131 Edge cover 132 Conductive part 14 External lead-out electrode 15 Insulating material

Claims (6)

A transparent substrate;
A transparent electrode serving as an anode provided on the transparent substrate;
A cathode disposed opposite to the transparent electrode;
An organic device comprising an organic semiconductor layer laminated between the anode and the cathode,
An extraction electrode provided at a peripheral end of the transparent substrate;
A sealing substrate for sealing the organic device;
An edge cover made of an insulating material, and a connector having a conductive portion of a pair of conductive materials provided inside the edge cover;
An electrode extraction structure for an organic device, wherein the extraction electrode disposed on the outer periphery of the transparent substrate is sandwiched by the connector, and the extraction electrode and the conductive portion are brought into pressure contact to extract the electrode.   2. The organic device electrode extraction structure according to claim 1, wherein a plurality of the extraction electrodes are continuously formed at a peripheral end portion of the transparent substrate in a length direction of the transparent substrate.   The electrode extraction structure for an organic device according to claim 1, wherein the extraction electrode is routed around the back surface of the transparent substrate.   2. The organic device electrode lead-out structure according to claim 1, wherein the edge cover is formed of a material having rigidity or strength.   2. The organic device electrode extraction structure according to claim 1, wherein the transparent substrate is a glass substrate or a flexible material. A transparent substrate;
A transparent electrode serving as an anode provided on the transparent substrate;
A cathode disposed opposite to the transparent electrode;
An organic device comprising an organic semiconductor layer laminated between the anode and the cathode,
An extraction electrode provided at a peripheral end of the transparent substrate;
An insulating member covering a part of the extraction electrode;
A sealing substrate for sealing the organic device;
An edge cover made of an insulating material, and a connector having a conductive portion of a pair of conductive materials provided inside the edge cover;
An electrode extraction structure for an organic device, wherein the extraction electrode disposed on the outer periphery of the transparent substrate is sandwiched by the connector, and the extraction electrode and the conductive portion are brought into pressure contact to extract the electrode.

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