JP2013235958A - Solar battery cell and solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery cell which inhibits the deterioration of the light utilization efficiency and enables the planarization of a solar battery module, and to provide the solar battery module using the solar battery cell.SOLUTION: A base material 3 has a substantially rectangular cross sectional shape. The base material 3 is formed by a transparent base material. A transparent electrode 5 serving as a first electrode is formed on a lower surface of the base material 3. A side surface electrode 11a establishing electric continuity with the transparent electrode 5 is formed on one side surface of the base material 3. A power generation layer 7 is formed on a lower surface of the transparent electrode 5. A rear surface electrode 9 serving as a second electrode is formed on a lower surface of the power generation layer 7. A side surface electrode 11b establishing electric continuity with the rear surface electrode 9 is formed on one side surface of the base material 3 (a side surface opposite to the side where the side surface electrode 11a is formed).

Description

  The present invention relates to a long solar cell such as a tape shape and a solar cell module using the solar cell.

  Thin-film silicon solar cells, which are currently the mainstream in thin-film solar cells, have a structure in which an amorphous or polycrystalline silicon layer is sandwiched between a transparent electrode such as indium tin oxide (ITO) and an opaque electrode such as Al. Yes. Since these are generally formed on a flat substrate such as metal or glass, their flexibility is poor and their use is limited. In addition, since the transparent electrode has a high electric resistance, loss due to electric resistance is reduced by element isolation or patterning of a low-resistance material such as gold. However, this reduces the area contributing to power generation and reduces the light utilization efficiency.

  On the other hand, long solar cells such as tapes and fibers and solar cell modules based on their arrangement and connection have been developed. For example, a module that uses a first photovoltaic cell that includes an electrode and a second photovoltaic cell that includes an electrode and interconnects the electrode of the first photovoltaic cell and the electrode of the second photovoltaic cell. Yes (Patent Document 1).

JP 2006-12802 A

  However, in Patent Document 1, since the tape-shaped solar cells are connected by various methods such as wires, the solar cells are overlapped, and the light utilization efficiency is reduced. Moreover, since the adjacent photovoltaic cell cannot be arrange | positioned on the same plane, difficulty accompanies the arrangement | sequence in photovoltaic cell module formation.

  The present invention has been made in view of such a problem, and suppresses a decrease in light use efficiency when arranging and connecting long solar cells such as tapes and fibers to form a module. It is an object of the present invention to provide a long-sized solar battery cell and a solar battery module using the same.

  In order to achieve the above-described object, the first invention is a solar cell, which is a substantially rectangular base material, a first electrode formed on at least one surface of the base material, and laminated on the first electrode. And a second electrode formed so as to be laminated on the power generation layer, and in cross section, on one side surface of the base material, the first electrode and The conductive first conductor portion is exposed, and the second side surface of the base material is formed with a second conductive portion that is electrically connected to the second electrode and insulated from the first electrode. This is a characteristic solar battery cell.

  The first electrode is a transparent electrode, the first conductor portion is formed continuously with the transparent electrode, the second conductor portion is formed continuously with the second electrode, On the other side, the transparent electrode, the power generation layer, and the second electrode may be laminated in this order from the base material side.

  The transparent electrode may be formed on the entire circumference of the outer peripheral surface of the base material.

  In the cross section, the upper edge of the solar cell may be chamfered.

  In the cross-section, at the lower end of the one side surface, the side end portions of the power generation layer and the second electrode are formed to be shifted inward in the width direction from the side end surface of the first conductor portion, and the other side surface Preferably, the power generation layer and the side end portions of the second conductor portion are formed so as to be shifted downward from the upper end surface of the solar battery cell.

  The base material and the first electrode may be integrally formed, the whole base material may function as the first electrode, and the second electrode may be a transparent electrode.

  According to the first invention, the first conductor portion that is electrically connected to the first electrode is formed on one side surface of the base material, and the second conductor that is electrically connected to the second electrode is formed on the other side surface. Part is formed. Therefore, if each electrode is provided side by side so that the side surfaces of the base material are in contact with each other, they can be electrically connected to each other. Therefore, unlike the prior art, it is not necessary to connect the electrodes with other members such as wires.

  Moreover, since the side surfaces are brought into contact with each other, the connecting portions do not overlap as in the conventional case. For this reason, power generation efficiency is not reduced. Furthermore, since there is no overlapping of the connection portions, a flat solar cell module can be formed.

  Further, by laminating the transparent electrode, the power generation layer, and the second electrode in this order on one side surface of the base material, power generation can be performed also on the side surface portion. Furthermore, if the transparent electrode is formed on the entire circumference of the substrate, it is excellent in manufacturing.

  In addition, by forming an R chamfer at the edge on the upper surface side of the solar battery cells, it becomes easy to introduce a conductive member into the gap when the solar battery cells are provided side by side.

  Further, by shifting the power generation layer and the side end portion of the second electrode to the inner side in the width direction from the side end surface of the first conductor portion at the lower end of one side surface, the second electrode and the first conductor A short circuit with the part can be prevented. Similarly, at the upper end of the other side surface, the power generation layer and the side end portion of the second conductor portion are shifted downward from the upper end surface of the solar battery cell, thereby short-circuiting the second electrode and the first conductor portion. Can be prevented.

  A second invention is characterized in that a plurality of solar cells according to the first invention are provided, and the first conductor portion and the second conductor portion of the adjacent solar cells are connected to each other. It is a solar cell module.

  It is desirable that a gap is formed between the solar cells provided side by side, and the first conductor portion and the second conductor portion are made conductive by a conductive member introduced into the gap.

  According to the second invention, a flat solar cell module can be obtained. At this time, by introducing the conductive member into the gap between the solar battery cells, the electrodes on the side surfaces can be reliably conducted.

  ADVANTAGE OF THE INVENTION According to this invention, the solar cell which can suppress the fall of light utilization efficiency and can planarize a solar cell module, and a solar cell module using the same can be provided.

(A) is sectional drawing which shows the photovoltaic cell 1, (b) is the A section enlarged view of (a). (A) is a figure which shows the solar cell module which united and joined the some photovoltaic cell 1, (b) is the D section enlarged view of (a). (A) is sectional drawing which shows the photovoltaic cell 1a, (b) is the G section enlarged view of (a). Sectional drawing which shows the photovoltaic cell 1b. Sectional drawing which shows the photovoltaic cell. Sectional drawing which shows the photovoltaic cell 30. FIG. FIG. 3 is a cross-sectional view showing a solar battery cell 40. The figure which shows the modularization method of the photovoltaic cell 1b. The figure which shows the modularization method of the photovoltaic cell 1c.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a solar battery cell 1, FIG. 1 (a) is a cross-sectional view, and FIG. 1 (b) is an enlarged view of part A of FIG. 1 (a). In addition, the photovoltaic cell 1 is a elongate member, for example, and Fig.1 (a) is a figure which shows a cross section perpendicular | vertical to this longitudinal direction. The solar battery cell 1 includes a base material 3, a transparent electrode 5, a power generation layer 7, a back electrode 9, and the like.

  The base material 3 has a substantially rectangular cross-sectional shape. The base material 3 is made of a transparent base material. For example, glass such as quartz or Tempax (a trade name of a German special glass manufacturer “SCHOTT JENAer GLAS GmbH”) or a resin such as polyethylene terephthalate or polycarbonate may be used. it can. The size of the base material 3 is not particularly specified, but is desirably 50 mm or less in width and 200 μm or less in thickness, and more preferably 30 mm or less in width and 100 μm or less in thickness. By setting it as such thickness, the photovoltaic cell 1 can be given flexibility.

  A transparent electrode 5 as a first electrode is formed on the lower surface of the substrate 3. The transparent electrode 5 is made of, for example, ITO, tin oxide, zinc oxide or the like. The transparent electrode 5 is formed by sputtering, thermal CVD, coating and sintering, for example. The transparent electrode 5 has a thickness of about 100 nm and a surface roughness Ra of about 5 nm.

  On one side surface (right side in the figure) of the substrate 3, a side electrode 11 a that is electrically connected to the transparent electrode 5 is formed. That is, the transparent electrode 5 and the side electrode 11a are formed in a substantially L-shaped cross section continuously from the lower surface of the base material 3 and one side surface side. In addition, the side electrode 11a which is a 1st conductor part may be comprised with a different conductor from the transparent electrode 5, and may be integrally formed with the transparent electrode 5 and the same material. Hereinafter, description will be made assuming that the side electrode 11 a is a part of the transparent electrode 5.

  A power generation layer 7 is formed on the lower surface of the transparent electrode 5 so as to be laminated on the transparent electrode 5. The power generation layer 7 is a photoactive layer that performs photoelectric conversion. As a material of the power generation layer 7, for example, a silicon system, an alloy system, an organic system, or the like can be used. The power generation layer 7 is formed by, for example, plasma CVD, thermal CVD, coating sintering, or the like. The power generation layer 7 is continuously formed up to the side surface (the left side in the figure) opposite to the side on which the side electrode 11a is formed. That is, the power generation layer 7 is formed in a substantially L-shaped cross section that is continuous with the lower surface of the base material 3 (transparent electrode 5) and one side surface and is opposite to the transparent electrode 5.

  On the lower surface of the power generation layer 7, a back electrode 9 as a second electrode is formed so as to be stacked on the power generation layer 7. As a material of the back electrode 9, for example, conductors such as aluminum, copper, gold, and alloys thereof can be used. The back electrode 9 can be formed by, for example, vacuum deposition, sputtering, plasma CVD, thermal spraying, thermal CVD, coating sintering, plating, or the like.

  On one side surface of the substrate 3 (on the side opposite to the side on which the side electrode 11a is formed and on the left side in the figure), a side electrode 11b that is electrically connected to the back electrode 9 is formed. That is, the back electrode 9 and the side electrode 11 b are formed in a substantially L-shaped cross section in the same direction as the power generation layer 7 continuously to the lower surface and one side surface of the base material 3. Therefore, the back electrode 9 and the side electrode 11 b are formed so as to cover the power generation layer 7.

  Note that the side electrode 11b as the second conductor portion may be formed of a conductor different from the back electrode 9, or may be formed of the same material integrally with the back electrode 9. Hereinafter, description will be made assuming that the side electrode 11b is a part of the back electrode 9.

  As shown in FIG.1 (b), the electric power generation layer 7 and the back surface electrode 9 are each formed in the step shape in the lower end (end part of the transparent electrode 5) of the side electrode 11a. That is, the side end portion of the power generation layer 7 is formed to be shifted from the end surface on the side electrode 11a side by a distance B on the inner side in the width direction (left side in the figure). Similarly, the side end portion of the back electrode 9 is formed to be shifted from the side end surface of the power generation layer 7 by a distance C on the inner side in the width direction (left side in the figure).

  By doing in this way, when forming the transparent electrode 5 (side electrode 11a), the electric power generation layer 7, and the back surface electrode 9, it can prevent mutually short-circuiting. Moreover, when the photovoltaic cells mentioned later are provided side by side, it can prevent that the electrodes which are not intended short-circuit.

  In addition, the photovoltaic cell 1 can be manufactured as follows. First, the transparent electrode 5 is formed on a predetermined surface of the substrate 3. In addition, when the side electrode 11a is a different member from the transparent electrode 5, it is formed separately. In order to form the transparent electrode 5 on the lower surface and one side surface of the base material 3, for example, the other surface may be masked and formed by a vapor phase method, or the base material 3 may be disposed obliquely. Then, a thin film may be applied on the two surfaces simultaneously.

  Next, the power generation layer 7 is formed on the lower surface of the transparent electrode 5 and the side surface of the substrate 3. Further, a back electrode 9 is formed on the outer surface of the power generation layer 7. The method for forming the power generation layer 7 and the back electrode 9 on two predetermined surfaces may be the same as the method for forming the transparent electrode 5.

  The long solar battery cell 1 formed as described above is sealed as necessary. Examples of the sealing method include lamination and resin coating. Moreover, you may implement suitably the heat processing for characteristic improvement, such as photoelectric conversion efficiency, as needed.

  Next, a solar battery module using the solar battery cell 1 will be described. Fig.2 (a) is the elements on larger scale of a solar cell module, FIG.2 (b) is the D section enlarged view of Fig.2 (a). The solar cell module is configured by arranging a plurality of solar cells 1 of the present invention. At this time, the side electrodes 11a and 11b of the adjacent solar cells 1 are electrically connected. In other words, the transparent electrodes 5 and the back electrodes 9 of the adjacent solar cells 1 are electrically connected. Therefore, a plurality of solar cells 1 can be connected in series to constitute a solar cell module.

  In addition, as shown in FIG.2 (b), in order to conduct | electrically_connect the adjacent side surface electrodes 11a and 11b more reliably, you may arrange | position the electroconductive member 13 in the clearance gap between the side surface electrodes 11a and 11b. The conductive member 13 is a conductive ink containing, for example, metal nanoparticles. By doing in this way, it can prevent that a contact failure etc. arise by the slight unevenness | corrugation etc. of the side surface electrodes 11a and 11b.

  In addition, the electroconductive member 13 is introduce | transduced from the upper part of the photovoltaic cell 1 (arrow E direction in the figure). At this time, in order to facilitate the introduction of the conductive member 13 into the gap between the side electrodes 11a and 11b, it is desirable to perform R chamfering on the upper edge portion of the solar battery cell 1. For example, by forming R of about 20 μm, it becomes easy to introduce the conductive member 13. In addition, in order to prevent a short circuit between the same type of electrodes in adjacent cells, it is desirable to form the insulating portion 6 at a location that does not contribute to the connection between the cells as shown in the figure. The forming method is not particularly limited, but it is preferable to apply and form a thermosetting or photocurable resin.

  As mentioned above, according to this Embodiment, the photovoltaic cell 1 can be electrically connected by contact of side surfaces, without using members, such as a wire. For this reason, it is not necessary to overlap the photovoltaic cells 1 at the ends. Therefore, the power generation efficiency is high. Moreover, since the solar battery cell 1 should just be attached, the joining operation | work of electrodes is also unnecessary.

  Moreover, since the mutual wrap part is not formed when connecting the photovoltaic cells 1, the photovoltaic cells 1 can be provided side by side. Therefore, the solar cell module can be thinned.

  Moreover, since the step is formed at the portion where the transparent electrode 5, the power generation layer 7, and the back electrode 9 are stacked and exposed, the transparent electrode 5 and the back electrode 9 are not inadvertently connected.

  Moreover, since the electroconductive member 13 is formed in the clearance gap between the photovoltaic cells 1, the photovoltaic cells 1 can be reliably conducted. Moreover, since the upper edge part of the photovoltaic cell 1 is R-chamfered, the conductive member 13 can be easily introduced into the gap between the photovoltaic cells 1.

  Next, a second embodiment will be described. In addition, in the following description, about the structure which show | plays the same function as the photovoltaic cell 1, the code | symbol same as FIG. 1 is attached | subjected and the overlapping description is abbreviate | omitted. 3A and 3B are diagrams showing the solar cell 1a, in which FIG. 3A is a cross-sectional view, and FIG. 3B is an enlarged view of a portion G in FIG.

  Although the photovoltaic cell 1a is the structure similar to the photovoltaic cell 1, the aspects of the transparent electrode 5 differ. In the solar battery cell 1a, the transparent electrode 5 is formed on three surfaces of the base material 3 when combined with the side electrode 11a. That is, it is formed on the lower surface and both side surfaces of the substrate 3. The power generation layer 7 is formed on the outer surface of the transparent electrode 5 excluding the side electrode 11a.

  Also in the photovoltaic cell 1a, the power generation layer 7 and the back electrode 9 are each formed in a step shape at the lower end of the side electrode 11a (the end of the transparent electrode 5). That is, the F portion in FIG. 3A is formed in the same manner as in FIG.

  Moreover, as shown in FIG.3 (b), in the photovoltaic cell 1a, in the upper end of the side surface opposite to the side in which the side surface electrode 11a is formed, the electric power generation layer 7 and the side surface electrode 11b (back surface electrode 9) are respectively It is formed in a step shape. That is, the upper end portion of the power generation layer 7 is formed to be shifted downward from the upper end surface of the transparent electrode 5 by the distance H. Further, the upper end portion of the back electrode 9 is formed to be shifted by a distance I below the upper end surface of the power generation layer 7. By doing in this way, when forming the transparent electrode 5, the electric power generation layer 7, and the side surface electrode 11b (back surface electrode 9), it can prevent mutually short-circuiting.

  According to the solar battery cell 1a according to the second embodiment, the same effect as that of the solar battery cell 1 can be obtained. Moreover, in the photovoltaic cell 1a, since the transparent electrode 5, the power generation layer 7, and the side electrode 11b (back electrode 9) are laminated also on the side surface, this part can also contribute to power generation.

  Next, a third embodiment will be described. FIG. 4 is a diagram showing the solar battery cell 1b. Although the photovoltaic cell 1b is the structure similar to the photovoltaic cell 1a, the aspects of the transparent electrode 5 differ. In the solar battery cell 1b, the transparent electrode 5 is formed on the entire circumference of the substrate 3 when combined with the side electrode 11a.

  In addition, also in the photovoltaic cell 1b, the power generation layer 7 and the back electrode 9 are each formed in a step shape at the lower end of the side electrode 11a (the end of the transparent electrode 5). In addition, the power generation layer 7 and the side electrode 11a (back electrode 9) are each formed in a step shape at the upper end of the side opposite to the side on which the side electrode 11a is formed.

  According to the solar battery cell 1b according to the third implementation, the same effect as that of the solar battery cell 1a can be obtained. Further, when the transparent electrode 5 is formed on the surface of the base material 3, it is only necessary to form a film on the entire surface of the base material 3, so that masking or the like is unnecessary.

  Next, a fourth embodiment will be described. FIG. 5 is a diagram showing the solar battery cell 20. Unlike the photovoltaic cell 1 etc., the photovoltaic cell 20 has the power generation layer 7 formed on the upper surface side. The solar cell 20 includes an electrode 21, a power generation layer 7, a transparent electrode 25, and the like.

  The electrode 21 is formed on the upper surface of the substrate 3 and one side surface (left side in the figure). A side electrode 23a is formed on the other side surface (right side in the figure) of the substrate 3. The electrode 21 as the first electrode and the side electrode 23a as the first conductor portion are provided so as to be conductive. The side electrode 23a may be made of a conductor different from the electrode 21, or may be formed of the same material integrally with the electrode 21.

  The electrode 21 can have the same configuration as the back electrode 9 described above. Moreover, you may comprise the base material 3 and the electrode 21 integrally. In this case, the base material 3 and the electrode 21 (side electrode 23a) may be integrally formed of a metal such as copper, aluminum, or stainless steel. That is, in this case, all parts of the base material 3 are configured by the electrodes 21.

  The power generation layer 7 is formed on the upper surface and one side surface of the electrode 21 (the side surface opposite to the side surface electrode 23a and on the left side in the figure). A transparent electrode 25 as a second electrode is formed on the upper surface of the power generation layer 7. The transparent electrode 25 has the same configuration as the transparent electrode 5.

  On one side surface of the substrate 3 (on the side opposite to the side on which the side electrode 23a is formed and on the left side in the figure), a side electrode 23b that is electrically connected to the transparent electrode 25 is formed. That is, the transparent electrode 25 and the side electrode 23 b are formed in a substantially L-shaped cross section in the same direction as the power generation layer 7 continuously from the upper surface and one side surface of the base material 3. Note that the side electrode 23b as the second conductor portion may be formed of a conductor different from the transparent electrode 25, or may be formed of the same material integrally with the transparent electrode 25. The side electrodes 23a and 23b can have the same configuration as the side electrodes 11a and 11b.

  In the solar cell 20, the power generation layer 7 and the transparent electrode 25 are each formed in a step shape at the upper end of the side electrode 23 a (the end of the electrode 21). That is, the side end portion of the power generation layer 7 is formed so as to be shifted from the end surface on the side electrode 11a side inward in the width direction (left side in the figure). Similarly, the side end portion of the transparent electrode 25 is formed so as to be shifted inward in the width direction (left side in the drawing) from the side end surface of the power generation layer 7.

  The power generation layer 7 and the side electrode 23b (back electrode 9) are each formed in a step shape at the lower end of the side opposite to the side on which the side electrode 23a is formed. That is, the upper end portion of the power generation layer 7 is formed to be shifted upward from the lower end surface of the electrode 21. Further, the lower end portion of the transparent electrode 25 is formed to be shifted upward from the lower end surface of the power generation layer 7. By doing in this way, when forming the side electrode 23b (electrode 21), the electric power generation layer 7, and the side electrode 23b (transparent electrode 25), it can prevent mutually short-circuiting.

  Even when the solar battery cell 20 according to the fourth embodiment is used, the same effect as that of the solar battery cell 1 or the like can be obtained.

  Next, a fifth embodiment will be described. FIG. 6 is a diagram illustrating the solar battery cell 30. The solar battery cell 30 has substantially the same configuration as the solar battery cell 1b, but differs in that the power generation layers 7a and 7b are formed. In the solar battery cell 30, the power generation layers 7 a and 7 b are stacked in place of the power generation layer 7.

  The power generation layers 7a and 7b are power generation layers that generate power by absorbing light having different wavelengths, for example. Therefore, for example, it is possible to generate power in the power generation layer 7b by using light that has not been absorbed by the power generation layer 7a and has not contributed to power generation, with respect to light from above.

  Even when the solar battery cell 30 according to the fifth embodiment is used, the same effect as that of the solar battery cell 1 or the like can be obtained.

  Next, a sixth embodiment will be described. FIG. 7 is a diagram showing the solar battery cell 40. The solar battery cell 40 is formed by stacking solar battery cells 1b in a plurality of stages. That is, on the upper side of the solar battery cell 40, the transparent electrode 5a (including the side electrode 11a) is disposed on the outer periphery of the base material 3a. The power generation layer 7a is provided on the lower surface of the transparent electrode 5a and the side surface opposite to the side electrode 11a.

  Moreover, the transparent electrode 5b is arrange | positioned at the outer periphery of the base material 3b in the lower stage side of the photovoltaic cell 40. FIG. The transparent electrode 5b is further formed on the outer surface of the power generation layer 7a. The power generation layer 7a is provided on the lower surface of the transparent electrode 5a and the side surface opposite to the side electrode 11a. In addition, the power generation layer 7b is provided on the lower surface of the transparent electrode 5b and the side surface opposite to the side electrode 11a.

  Further, a back electrode 9 is formed on the lower surface of the power generation layer 7b. A side electrode 11b that is electrically connected to the back electrode 9 is formed so as to cover the entire side surface opposite to the side electrode 11a. An insulating layer 41 is formed between the transparent electrode 5b and the side electrode 11b (back electrode 9) so as not to conduct.

  With this configuration, the power generated by the power generation layers 7a and 7b can be extracted from the side electrodes 11a and 11b. In addition, the point which comprises a level | step difference in each structure is the same as that of the above-mentioned embodiment.

  Even when the solar battery cell 30 according to the sixth embodiment is used, the same effect as that of the solar battery cell 1 or the like can be obtained.

  Next, a seventh embodiment will be described. FIG. 8 is a diagram showing modularization of solar cells. For example, a plurality of solar cells 1b shown in FIG. 8A are provided on the base sheet 45 and connected as shown in FIG. 8B. Then, the protective sheet 43 is affixed from the upper surface of the photovoltaic cell 1b provided side by side. Note that the base sheet 45 and the protective sheet 43 have flexibility. The protective sheet 43 is, for example, a transparent resin sheet.

  In addition, what is necessary is just to peel and connect a part of protective sheet 43 for wiring out to the exterior. Alternatively, a wiring pattern may be formed in advance on the protective sheet 43. By doing in this way, a photovoltaic cell can be protected reliably. In addition, in FIG. 8, it cannot be overemphasized that the other photovoltaic cell mentioned above can be used. In addition, in order to prevent a short circuit between the same type of electrodes in adjacent cells, it is desirable to form the insulating portion 6 at a location that does not contribute to the connection between the cells as shown in the figure. The forming method is not particularly limited, but it is preferable to apply and form a thermosetting or photocurable resin.

  Moreover, the photovoltaic cell 1c as shown to Fig.9 (a) can also be used. The solar cell 1c is substantially the same as the solar cell 1b, but a part of the transparent electrode is cut in the longitudinal direction. One side surface of the transparent electrode 5 that is cut off is a side electrode 11a. Further, the other side surface is connected to the back surface electrode 9 at the lower portion to become a side surface electrode 11b. By setting it as such a structure, the protective layer 47 can be formed in the step before the installation of the photovoltaic cell 1c. The protective layer 47 is made of, for example, an ultraviolet curable resin or a resin film laminate.

  A plurality of solar cells 1c configured as described above are provided side by side on the base sheet 45 and connected, whereby the solar cells can be modularized. In addition, since the site | part which conducts with each of the side surface electrodes 11a and 11b is formed in the upper surface, wiring outside is easy.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 20, 30, 40 ......... Solar cell 3, 3a, 3b ......... Base material 5, 5a, 5b, 25 ......... Transparent electrode 6 ......... Insulating part 7, 7a, 7b ......... Power generation layer 9 ......... Back electrodes 11a, 11b, 23a, 23b ......... Side electrode 13 ......... Conductive member 21 ......... Electrode 41 ......... Insulating layer 43 ......... Protective sheet 45 ... ... Base sheet 47 ... Protective layer

Claims (8)

A solar cell,
A substantially rectangular base material;
A first electrode formed on at least one surface of the substrate;
A power generation layer formed so as to be laminated on the first electrode;
A second electrode formed to be laminated on the power generation layer;
Comprising
In cross section
On one side surface of the base material, a first conductor portion that is electrically connected to the first electrode is exposed,
A solar cell, wherein the second side surface of the base material is formed with a second conductor portion that is electrically connected to the second electrode and insulated from the first electrode. The first electrode is a transparent electrode,
The first conductor portion is formed continuously with the transparent electrode, the second conductor portion is formed continuously with the second electrode, and the transparent electrode from the base material side is formed on the other side surface. The solar cell according to claim 1, wherein the power generation layer and the second electrode are stacked in this order.   The solar cell according to claim 2, wherein the transparent electrode is formed on the entire circumference of the outer peripheral surface of the base material.   The solar cell according to any one of claims 1 to 3, wherein an upper edge portion of the solar cell is rounded in a cross section. In the cross section, at the lower end of the one side surface, the side end portions of the power generation layer and the second electrode are formed to be shifted inward in the width direction from the side end surface of the first conductor portion,
The upper end of the other side surface is formed such that the side end portions of the power generation layer and the second conductor portion are shifted downward from the upper end surface of the solar battery cell. The solar battery cell according to any one of 4. The base material and the first electrode are integrally configured, and the whole base material functions as the first electrode,
The solar cell according to claim 1, wherein the second electrode is a transparent electrode.   A plurality of solar cells according to any one of claims 1 to 6, wherein the first conductor portion and the second conductor portion of the adjacent solar cells are electrically connected to each other. A featured solar cell module. A gap is formed between the solar cells provided side by side, and the first conductor portion and the second conductor portion are made conductive by a conductive member introduced into the gap. Item 8. The solar cell module according to Item 7.

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