JPH0362577A - Manufacture of solar battery apparatus - Google Patents

Abstract

PURPOSE:To make a light receiving apparatus surely capture the reflected light of an incident light, by forming an irregular reflection surface on the rear of a substrate, which surface irregularly reflects irradiation light when the light is projected on the rear of the substrate of a solar battery apparatus. CONSTITUTION:A roof tile main body 10 made of optically transparent and insulative material is used as a substrate, and a plurality of solar batteries 11 are formed parallel with the rear of the substrate. When the light which has penetrated the main body 10 enters the batteries 11, generated electrons and positive holes are collected and superposed by each transparent electrode and rear surface electrode, and further by the transparent electrodes and the rear surface electrodes of the adjacent batteries 11. Thus electrically added electric power are led out. When the above batteries 11 are formed by laser patterning, a lot of recesses and protrusions are formed on the whole rear surface of the main body 10, and the said surface is formed as an irregular reflection surface 10a of light. Thereby the light from a light emitting apparatus 1 is subjected to irregular reflection by the rear surface of the main body 10, and at least a part of the reflected light is surely captured by a light receiving apparatus 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an improvement in a method for manufacturing a solar cell device in which a solar cell is formed on the back surface of a substrate.

(b) Conventional technology The development of solar cells for converting light energy into electrical energy is progressing, but if these solar cells are to be used to provide household electricity, it is necessary to install solar cells over a wide area. There is an attempt to use roof tiles as a way to do this. That is, the roof tile body is formed using a material with translucency and insulation properties, and the solar cells are formed on the back side of the roof tile body. However, when forming this solar cell by laser patterning, the back side of the roof tile body is It is necessary to move the laser beam while keeping it focused. However, the main body of the roof tile is curved to protect against rainwater, and the processing accuracy of the roof tile main body is relatively low, so the focus cannot be processed within the shallow depth of focus of the laser generator. Methods that program control according to the position are prone to machining defects.

As a countermeasure for this, a displacement measuring device is used that projects light from a laser beam generator onto the surface of the roof tile body and captures this reflected light with a receiver. A promising method is to detect the change in the horizontal position using a sensor in the light receiver, and to adjust the roof tile position so that this distance always matches the focal length of the laser generator.

However, when adopting this method, the back surface of the conventional roof tile body is formed to be smooth in order to reduce reflection loss, so the light projected from the light emitting device of the displacement measurement device onto the roof tile body is , there was a problem in that the curved portion could not be captured by the light receiver.

Figures 7 (a), (b), and (c) are schematic diagrams showing the optical system of the displacement measurement unit that captures the reflected light from the back surface of the roof tile body and measures its displacement, and 1 in the figure shows the displacement. A light emitting device is located at the bottom of the measuring section, 2 is a light receiver, and 3 is the back side of the roof tile body. The light emitted from the light emitter 1 is now incident on the roof tile body, and part of it is transmitted, but the rest is reflected, as shown in Figure 7 (
As shown in b), if the vertical line at the point of incidence on the roof tile body matches the bisector of the optical axis of emitter 1 and receiver 2, it will be captured by receiver 2, but if it does not match, is the seventh
As shown in Figures (b) and (c), the reflected light did not reach the light receiver 2, making it impossible to accurately adjust the distance, and the distance could be misjudged, which could impair reliability.

(c) Problems to be Solved by the Invention The present invention has been developed in view of the above problems, and its purpose is to use the surface of the roof tile body on which solar cells are to be formed as a surface for diffusely reflecting light. To form a light diffused reflection surface on the back surface of a roof tile so that a receiver can accurately capture the reflected light from the roof tile body, automatically adjust the focus, and improve processing accuracy. It is.

(d) Means for solving the problem In forming a plurality of solar cell elements in a separate arrangement on the back side of a curved substrate having translucent and insulating properties in parallel to a direction orthogonal to the curved direction. , a solar cell that irradiates the back surface of the substrate with irradiation light to measure the displacement of the back surface of the substrate, and irradiates the thick FJ% cell element with an energy beam based on the measured value to separate the element. The method for manufacturing the device is characterized in that a diffusely reflecting surface on which the irradiated light is diffusely reflected is formed on the back surface of the substrate.

(E) Function During laser patterning of a solar cell device, when light is incident on the back surface of the substrate of the solar cell device, it is diffusely reflected by the uneven surface formed on the back surface, and as a result, the light emitter of the displacement measuring device When light enters the sensor, a portion of the light is diffusely reflected and is always accurately captured by the receiver.

(F) Embodiment FIG. 1 is a schematic diagram of the back side of the solar cell device according to the present invention, in which 10 is a roof tile body made of a translucent, insulating material such as glass, and 11 is a roof tile body. A solar cell formed on the back surface of the tile main body 10 as a substrate is shown. Although not shown in detail, each solar cell 11 has a groove bottom formed by laminating a transparent electrode, an amorphous silicon layer, and a back electrode in this order, so that the light transmitted through the roof tile body 10 is connected to the solar cell 11. Electrons and holes generated by entering the amorphous silicon layer are collected by each transparent electrode, the back electrode, and even between the transparent electrodes and back electrodes of other adjacent solar cells 11, and are superimposed and electrically coupled. The added power is extracted.

By the way, when the solar cell 11 as described above is formed by laser patterning, the roof tile main body 10 has fine concave shapes on the entire back surface (or the negative part), as shown in FIG.
A large number of convex shapes are formed in parallel in a direction perpendicular to the curved direction of the roof tile body 10, and the back surface of the roof tile body 10 on which the solar cells 11 are to be formed is formed into a light diffused reflection surface 10a consisting of a smooth uneven curved surface. It is.

The formation pitch of the above concave and convex shapes is several tens to 100 μm
The shape is a combination of a sine curve and other circular arcs, and the light from the light emitter 1 in the displacement measuring device is diffusely reflected on the back surface of the roof tile body 10 as shown in FIG. At least part of the light is transmitted to the receiver 2
It is now possible to reliably capture the For example, if the light emitter 1 and the light receiver 2 of the displacement measuring device are arranged at symmetrical angles with respect to the perpendicular to the IO surface of the roof tile main body, the concave and convex shapes at least partly overlap the horizontal plane 10c. All you have to do is set it so that it has it. Of course, the formation pitch and shape of the concave and convex shapes are not particularly limited to those described above, and the light projected from the light emitter 1 of the roof tile body 10 is reflected by the roof tile body 10 and at least one of the shapes is not limited to the above-mentioned ones. Any mode may be used as long as the portion is always captured by the light receiver 2. However, so that sunlight entering the roof tile body 10 enters the solar cell 11 with as low a reflectance as possible,
It is desirable that the concave and convex back surfaces be as smooth as possible.

When light is incident on the back surface of the roof tile main body 10, which has been bottomed in this way, as shown in FIG. 4, it is diffusely reflected by the uneven surface formed on the back surface, as shown in FIG. 5. When light is incident from the light emitter 1 of the displacement measuring device, a portion of the light is diffusely reflected and is always accurately captured by the light receiver 2.

FIG. 6 is a schematic diagram showing a mode in which laser patterning is performed in the process of forming a solar cell on the back surface of the roof tile main body 10 according to the present invention, where 21 is in the X-axis direction;
22 is a table that moves in the X-axis direction, that is, the left and right directions; 23 is a table that moves in the Y-axis direction, that is, in the front-back direction; 24 is a laser generator; 25
indicates a displacement measuring device.

The roof tile main body 10 is placed on a movable table 21 with the back surface facing upward in order to divide and form the amorphous silicon layer formed on the transparent electrode on the back surface into parts constituting each unit thick FJ% battery. It is placed. On this moving table 21, a displacement measuring device 25 is disposed opposite to the roof tile main body 10, and a laser generating device 24 is oriented vertically downward above the center between the emitter 1 and the light receiver 2 of the displacement measuring device 25. It is arranged with its focal point aligned with the surface of the amorphous silicon layer on the roof tile body 10. Reference numeral 26 denotes an X-axis direction drive control unit, and 27 denotes an X- and Y-axis direction drive control unit, and the trajectory of the laser beam on the back surface of the roof tile body 10 for patterning the amorphous silicon layer is set in advance. Based on the laser patterning start signal, the tables 22 and 23 are moved, and the laser beam is moved over the amorphous silicon layer of the roof tile body 10, so that it is applied to the back side of the substrate parallel to the direction orthogonal to the curved direction. An amorphous silicon layer is formed in sections.

On the other hand, from the light emitter 1 of the displacement measuring device @25, the roof tile body 1
Light is projected onto the amorphous silicon layer surface on the back side of 0,
The light that is diffusely reflected from the back surface is captured by the light receiver 2, and a signal corresponding to the change in the light receiving position is output to the one-dimensional sensor of the light receiver 2, which is amplified by the amplifier 28 and expressed as the amount of change in the roof tile body 10. It is input to the axial drive control section 26.

The X-axis direction drive control unit 26 outputs a control signal to the moving table 21 in order to resolve the upward and downward changes in the roof tile main body 1o, and moves the moving table 21 in the vertical direction to the roof tile main body 10. The laser beam incident point is always made to coincide with the lens focal position of the laser generator 24.

Although the above embodiments have been described with respect to a configuration in which laser patterning is performed, it goes without saying that the present invention can also be applied to a case where a high-energy beam such as an electron beam or an ion beam is used instead of a laser.

It can also be applied to measuring the surface dimensions and properties of the main body.

FIG. 8 is a schematic cross-sectional view showing another embodiment of the present invention. In this roof tile main body 10', the tangent line in the curved part is horizontal, that is, the peak part 10 of the curved part.
d′ and the part excluding the valley bottom 10e′ is a diffused reflection surface 10a′.
It is formed. This does not create an uneven surface,
The reflected light from this portion can be captured within the field of view of the objective lens of the displacement measuring device 25, which also improves the transmittance of the roof tile body 10' and has the effect of reducing reflection loss of light.

In addition, in the above-mentioned embodiment, a tank bottom in which a diffused reflection surface is not formed at the peak and valley bottom portions of the roof tile main body 10' has been described, but the area in which this diffused reflection surface is not formed is not limited to the above-mentioned portions, and may be caused by displacement. Depending on the relative position of the light emitter 1 and the light receiver 2 of the measuring device 25, the light from the light emitting rjr1 is reliably transmitted to the light receiver 2.
In areas where it can be detected, the unevenness is small or not formed.
! ! Of course, there are good things to be said for the company.

(G) Effects of the Invention According to the present invention, when a plurality of solar cells are separately arranged and formed on the back side of a curved substrate having light-transmitting and insulating properties in parallel to a direction orthogonal to the curved direction, A light diffused reflection surface is formed on the back surface of the substrate. By doing so, the receiver can reliably capture the reflected light of the incident light from the light emitter, and the displacement of the surface position of the roof tile body can be recognized, and the processing beam focus can be accurately positioned on the surface of the roof tile body. The present invention has excellent effects, such as making it possible to easily process the roof tile body even if the curved surface and forming tolerance are large, and making it easy to manufacture the roof tile body, thereby reducing the cost of the product. It is something.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a solar cell used in the present invention, Fig. 2 is a schematic sectional view of a roof tile body used in the present invention, and Fig. 3 is a partially enlarged view of the roof tile body in Fig. 2; FIG. 4 is a further enlarged partial view, FIG. 5 is a relationship diagram between the roof tile main body and the displacement measuring device in the present invention, FIG. 6 is a schematic diagram showing an aspect of laser patterning, and FIGS. (b) and (c) are relationship diagrams between a conventional roof tile main body and the amount of displacement detected on its back surface, and FIG. 8 is a schematic cross-sectional view showing another embodiment of the present invention. 1... Emitter, 2... Light receiver, 10.10゛...
・Roof tile body, 11...Solar cell, 21.22.23
...Moving table, 24...Laser generator, 25
...Displacement measuring device.

Claims (1)

[Claims] (1) When forming a plurality of solar cell elements on the back side of a curved substrate having translucent and insulating properties in a separate arrangement parallel to the direction perpendicular to the curved direction, irradiation light is applied to the back side of the substrate. In the method of manufacturing a solar cell device, the energy beam is irradiated to the solar cell element to separate the element based on the measured value while measuring the displacement of the back surface of the substrate by irradiating the energy beam to the substrate. A method for manufacturing a solar cell device, characterized in that a diffusely reflecting surface that diffusely reflects light is formed on the back surface of the substrate.