JP2001168369A - Power generation device using globular semiconductor element and light emitting device using globular semiconductor element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the photoelectric transfer efficiency of a photoelectric transfer type power generation device by increasing a quantity of light received by a semiconductor element array of the device and also increase the light emitting efficiency by reflecting the light generated at the rear side of the device towards the front side. SOLUTION: A solar battery array which is a plurality of serially connected solar battery cells 10, each having a photoelectromotive force generating section, is housed in a translucent case member 2. A reflector 5 is tightly installed on the rear side of the case member 2 and therefore the solar battery array can recieve not only the solar light 25 incident on the front side of the case member 2 but also the light reflected on the globular reflection surface 5a, and thus a quantity of light received by the solar battery array is increased and hence is the photoelectromotive force by the solar battery cells 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation device in which the amount of light received by a plurality of spherical semiconductor elements is increased by reflected light to enhance photoelectric conversion efficiency. The present invention relates to a light emitting device in which light emission efficiency is enhanced by being concentrated only on the side.

[0002]

2. Description of the Related Art Various types of solar cells using semiconductors that convert sunlight energy into electric energy have become widespread. In this type of semiconductor solar cell, semiconductors such as silicon single crystal, silicon polycrystal, and amorphous Si are generally mainly used. However, the photoelectric conversion efficiency is low, and the manufacturing process including wiring and assembly is complicated. Therefore, there is a problem that it is expensive and cannot be downsized.
In addition, in this type of semiconductor solar cell, the semiconductor substrate is planar, and the light receiving surface and the pn junction formed therein are also substantially planar, so that when the incident angle of light increases, reflected light increases. There is a problem that the photoelectric conversion efficiency increases and the photoelectric conversion efficiency decreases.

Accordingly, the inventor of the present application has published International Publication WO98
/ 15983, it can be applied to various uses by using a spherical semiconductor element as a light receiving element (photoelectric conversion element), a light emitting element (electric light conversion element) and a photocatalyst element, making it possible to reduce the size and weight, improve the power generation voltage, and reduce the cost. A new semiconductor device that can be realized is proposed. That is, as a photoelectric conversion type semiconductor device, a solar cell array is basically formed in which solar cells having a diffusion layer and a pn junction and a pair of electrodes formed on the surface of a spherical semiconductor crystal are arranged in a line and connected in series. In addition, a columnar solar cell device in which the solar cell array is housed in a light-transmitting case is proposed, and a panel-shaped solar cell device in which the plurality of solar cell arrays are housed in a light-transmitting case is provided. Proposed.

In any of these solar cell devices, the upper and lower main surfaces of the light-transmitting case have a geometrically symmetric structure, so that sunlight can be received from both front and back directions, and The photovoltaic power is generated by directly irradiating the battery cells. Moreover, a curved surface having a partially cylindrical shape is formed on each of these main surfaces so that light can be received at a wide angle.
The light receiving performance for light whose incident direction fluctuates, such as sunlight, is improved. Furthermore, as a light-to-light conversion type semiconductor device using a light emitting diode basically configured in the same manner as a solar cell, by applying a voltage to a pair of electrodes of the light emitting diode, light is emitted toward both front and back sides. A possible columnar or panel light emitting device was proposed.

[0005]

In a cylindrical or panel-shaped photoelectric conversion type semiconductor device proposed by the inventor of the present application in International Publication WO98 / 15983, a plurality of solar cell arrays are arranged in parallel in a case. Because it contains
Of the surface of the case, the photoelectric conversion ineffective area which does not contribute to the photoelectric conversion at all due to the transmission of sunlight between the partial cylindrical curved surfaces provided with the solar cells is large, so that the photovoltaic conversion efficiency is reduced. There is a problem.

Further, in these photoelectric conversion type semiconductor devices, there is a problem that transmitted light which does not contribute to photoelectric conversion and passes through the case increases, and the photoelectric conversion efficiency due to the transmitted light further decreases. In particular, in many cases, light incident from one side (for example, the front side) of a photoelectric conversion type semiconductor device is received, but the back side of this semiconductor device does not contribute to photoelectric conversion.

Further, in an electro-optical conversion type semiconductor device, light generated by a light emitting diode is simultaneously emitted toward the front side and the back side of the semiconductor device. In addition, there is a problem that light emitted to the back side of the semiconductor device is wasted. An object of the present invention is to increase the amount of light received by the semiconductor element array of the photoelectric conversion type power generation device to increase the photoelectric conversion efficiency, and to emit light generated on the back side by the electro-optical conversion type power generation device from the front side. Increasing luminous efficiency, and the like.

[0008]

According to a first aspect of the present invention, there is provided a power generating device using a spherical semiconductor element, wherein a photovoltaic power generation section is formed on a spherical semiconductor crystal and a pair of electrodes are formed at both ends. In a power generating apparatus including a semiconductor element array in which a plurality of semiconductor elements are connected in series, and a light-transmissive case member for accommodating the semiconductor element array, the power supply apparatus is provided in close contact with the back side of the case member, and There is provided a reflecting member capable of reflecting light incident from the side and transmitted through the case member toward the semiconductor element array.

A semiconductor element array in which a plurality of spherical semiconductor elements having a photovoltaic power generation section are connected in series is accommodated in a light-transmissive case member, and a reflection member is provided on the back side of the case member in close contact. Therefore, each spherical semiconductor element not only generates a photovoltaic force by light directly applied to the semiconductor element array via the case member, but also enters from the surface side, passes through the case member, and is reflected by the reflection member. The reflected light is also received to generate photovoltaic power. That is, since the semiconductor element array can receive not only the direct light incident on the case member but also the reflected light, the amount of received light increases, the photoelectromotive force of the spherical semiconductor element increases, and the photoelectric conversion efficiency can be greatly increased. .

According to a second aspect of the present invention, there is provided a power generating apparatus using a spherical semiconductor element, wherein a plurality of spherical semiconductor elements each having a pair of electrodes formed at both ends by forming a photovoltaic generator on a semiconductor spherical crystal. In a power generation apparatus including a semiconductor element module in which a plurality of connected semiconductor element arrays are arranged in parallel and a light-transmissive case member that accommodates the semiconductor element module, the power supply apparatus is provided in close contact with the back side of the case member and There is provided a reflecting member capable of reflecting light incident on the front side of the case member and transmitted through the case member toward the semiconductor element array.

In this case, the semiconductor device module operates in substantially the same manner as in claim 1, but the semiconductor device module in which a plurality of semiconductor device arrays are arranged in parallel is accommodated in a light-transmissive case member. Since not only the direct light incident on the member but also the reflected light reflected by the reflecting member can be received, the amount of received light increases, the photovoltaic power of the spherical semiconductor element can be further increased, and the photoelectric conversion efficiency can be greatly increased. .

Here, when the reflecting member is made of a reflecting film adhered to the back surface of the case member (claim 3 or 3), various reflecting films such as metal films are used. This makes it possible to reduce the size and cost of the reflection member, and to ensure reflection efficiency. In the case where the reflection member is made of a synthetic resin plate-like reflector adhered to the back surface of the case member (claim 4 depending on claim 1 or 2), a plate such as white scattering reflection type polycarbonate is used. By using a shape reflector,
The reflection efficiency can be ensured, and the case member can be reinforced.

According to a fifth aspect of the present invention, there is provided a light emitting device using a spherical semiconductor element, wherein a plurality of spherical semiconductor elements each having an electro-optical converter formed on a semiconductor spherical crystal and a pair of electrodes formed at both ends are connected in series. In a light emitting device including a semiconductor element array and a light transmissive case member for accommodating the semiconductor element array, the light emitting device is provided in close contact with the back side of the case member and is generated in the semiconductor element array and is formed on the back side of the case member. A reflection member capable of reflecting the transmitted light toward the surface of the case member is provided.

A semiconductor element array in which a plurality of spherical semiconductor elements having an electro-optical converter are connected in series is accommodated in a light-transmissive case member, and a reflecting member is provided in close contact with the back side of the case member. Light generated in the semiconductor element array by applying a voltage to the pair of electrodes is emitted to both the front side and the back side of the case member. At this time, the light transmitted to the back side of the case member is reflected to the front side by the reflecting member. That is, the light generated in the semiconductor element array is emitted to both front and back sides of the case member, but the light on the back side is reflected by the reflection member and emitted to the front side, so that all the light generated in the semiconductor element array is emitted. The light can be efficiently emitted to the surface side of the case member.

According to a sixth aspect of the present invention, there is provided a light emitting device using a spherical semiconductor element, wherein a plurality of spherical semiconductor elements each having an electro-optical conversion section formed on a semiconductor spherical crystal and a pair of electrodes formed at both ends are connected in series. In a light emitting device comprising a semiconductor element module in which a plurality of semiconductor element arrays are arranged in parallel and a light-transmissive case member for accommodating the semiconductor element module, a semiconductor element provided in close contact with the back side of the case member There is provided a reflecting member capable of reflecting light generated in the array and transmitted to the back side of the case member to the front side of the case member.

In this case, the semiconductor device module operates in substantially the same manner as in claim 5, except that a semiconductor device module in which a plurality of semiconductor device arrays are arranged in parallel is accommodated in a light-transmissive case member. The light generated in the above is emitted to both the front and back sides of the case member, but the light on the back side is reflected by the reflection member and emitted to the front side, so that all the light generated in the semiconductor element module is emitted to the front side of the case member. Can be efficiently emitted.

Here, when the reflecting member is formed of a reflecting film adhered to the back surface of the case member (claim 5 or 6 depending on claim 6), various reflecting films such as metal films are used. This makes it possible to reduce the size and cost of the reflection member, and to ensure reflection efficiency. In the case where the reflection member is made of a synthetic resin plate-like reflector adhered to the back surface of the case member (claim 8 depending on claim 5 or 6), a plate such as white scattering reflection type polycarbonate is used. By using a shape reflector,
The reflection efficiency can be ensured, and the case member can be reinforced.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a solar cell array 19 in which a plurality of solar cells 10 are electrically connected in series is provided.
(Semiconductor element array) A panel-shaped solar cell device 1 (using a spherical semiconductor element) using a solar cell module 19A (corresponding to a semiconductor element module) in which a plurality of rows are arranged in parallel in a light-transmissive case member 2. This is an example of a case in which the present invention is applied to a power generation device that has been used.

First, the solar cell array 19 will be described. As shown in FIG. 1 and FIG.
Is a configuration in which a plurality of (for example, five) solar cells 10 are connected in series. In this case, the solar cell array 19
One rectifier diode 20 is additionally connected. The solar cell 10 will be described with reference to FIG.

The spherical solar cell 10 has, for example, a diameter of 1.
A spherical crystal 11 of 5 mm and made of a p-type silicon semiconductor having a resistivity of about 1 Ωcm was manufactured by a semiconductor spherical crystal manufacturing apparatus (not shown). That is, the inventor has published WO
As filed in Japanese Patent Application No. 98/15983, an n-type diffusion layer 12 and a pn junction 13 are formed in the vicinity of the surface of the spherical crystal 11, and a light-transmitting insulation is provided on the surface of the spherical crystal 11 to protect the surface and prevent reflection. A coating 14 is formed. A positive electrode 15 electrically connected to p-type silicon and a negative electrode 16 electrically connected to n-type diffusion layer 12 are formed.

Further, the surface of the positive electrode 15 is covered with an Al paste film 17 having a thickness of about 20 μm, and the surface of the negative electrode 16 is covered with an Ag paste film 18 having a thickness of about 20 μm. To form the solar cell array 19 by connecting the solar cells 10 in series, both electrodes 15 and 16 of the solar cells 10
They are provided at opposite ends. Here, the spherical crystal 1
A photovoltaic power generation unit is constituted by 1, the n-type diffusion layer 12 on the surface, the pn junction 13, and the like.

As shown in FIGS. 1 and 2, the front surface (front surface) and the rear surface (rear surface) of a rectangular plate-shaped case member 2 made of a light-transmitting synthetic resin (for example, polycarbonate resin). ), The solar cell module 1 in which the curved surface 2a having a partially cylindrical surface bulging outward is formed in four rows, and the solar cell array 19 with the rectifier diode 20 is arranged in four rows.
9A is buried and accommodated inside the case member 2 corresponding to the two curved surfaces 2a. The rectifier diode 20 has a difference in the photovoltaic power between the solar cell arrays 19 when the plurality of solar cell arrays 19 are connected in parallel to increase the output, and the rectifier diode 20 has a lower photovoltaic power from the higher solar cell array 19. A reverse current flows through one of the solar cell arrays 19 and the solar cell array 1
This is to prevent 9 from heating.

Here, the rectifier diode 20 will be briefly described. As shown in FIG. 4, a p-type diffusion layer 22 in which a p-type impurity is diffused and a pn junction are formed in a spherical crystal 21 made of an n-type silicon semiconductor. 23 are formed, and the same Ti
O ₂ of the insulating coating 14 and the negative electrode 15a, the positive electrode 16a, paste film 17, 18 are formed. The positive electrode lead pin 3 is connected to the Al paste film 17 of the solar cell 10 on the front side, the negative electrode lead pin 4 is connected to the Ag paste film 18 of the rectifier diode 20, and these lead pins 3 and 4 are connected to an external circuit. It is connected to the.

On the back side of the case member 2 (the back side in FIG. 2),
A reflecting plate 5 (corresponding to a reflecting member) made of a scatter reflection type synthetic resin (for example, white scatter reflection type polycarbonate) is adhered in close contact. That is, since the reflection plate 5 is opaque and reflective, the curved surface 2 of the case member 2 of the reflection plate 5 is used.
The contact surface that contacts the lower side of “a” acts as a hemispherical reflecting surface 5a, and a plurality of hemispherical reflecting surfaces 5a provided corresponding to the respective solar cells 10 are continuously formed. Therefore, the sunlight 25 incident from the front side of the case member 2 and transmitted through the case member 2 is surely reflected toward the solar cell array 19 by any of the hemispherical reflecting surfaces 5a.

Next, the reflection of sunlight 25 by the reflector 5 will be described with reference to FIG. When the solar cell device 1 is irradiated with the solar light 25, the solar light 25 directly applied to the solar cell 10 via the curved surface 2a causes p
The n-junction 13 separates photo-excited carriers (electrons and holes) to generate photovoltaic power.

The sunlight 25 applied to the case member 2 between the curved surfaces 2a from various directions is transmitted through the case member 2 without being incident on the solar battery cell 10, but on the upper side of the reflection plate 5. Since the light is reflected by the hemispherical reflecting surface 5a and is forcibly changed in direction toward the solar cell 10, a larger current is generated in the pn junction 13 by the reflected sunlight 25. Here, the solar cell 10 can generate a maximum of about 0.6 V by the received sunlight 25. Incidentally, four rows of cylindrical accommodation holes may be formed inside the case member 2 corresponding to the two curved surfaces 2a, and the solar cell array 19 may be accommodated in these accommodation holes.

Here, as shown in FIG. 6, a solar cell device 1A in which the solar cell device 1 is partially modified may be configured. That is, the hemispherical reflecting surfaces 5a where the reflecting plate 5A and the case member 2A are in contact with each other are formed in minute unevenness (jagged shape). In this case, even if the sunlight 25 irradiated to the case member 5A between the curved surfaces 2a is incident from any irradiation direction, the sunlight 25 does not pass through the case member 5A,
Since the light is irregularly reflected by the uneven hemispherical reflecting surface 5a and forcibly changed its direction toward the solar cell 10, the power generation efficiency of the solar cell 10 can be further improved.

Further, the solar cell device 1B may be configured as shown in FIG. That is, the case member 2B is formed in a tube shape from a synthetic resin such as light-transmitting polycarbonate, and a set of the rectifying diode 20 and the solar cell array 19 are accommodated inside the case member 2B. With the two members 2B adjacent to each other, the lower half of each of the case members 2B is buried and fixed to the reflector 5B. Also in this case, the sunlight 25 transmitted through the case member 2B without being incident on the solar cell 10
Are reliably reflected by the hemispherical reflecting surface 5a and
Therefore, the power generation efficiency of the solar cell 10 can be further improved.

The above-mentioned panel-shaped solar cell device 1 is arranged on a substrate in a matrix as shown in FIG. 8, and the lead pins 3 and 4 of each solar cell device 1 are connected to an external circuit via a terminal 26. The large panel-shaped solar cell device 1C which is directly connected and / or connected in parallel may be configured. In this case, by increasing the light receiving area of the sunlight 25, it is possible to increase the voltage and / or the current of the solar cell.
For example, by connecting a plurality of solar cell devices 1 provided for each stage in parallel to form a solar cell device group, for example, 3V is generated from each of the solar cell device groups. 6V and 9V are generated by connecting two or three stages of solar cell device sets in series.

As shown in FIG. 9, a large number (for example,
(50 to 100) solar cells 10 are connected in series to form a solar cell array 19, and a panel-shaped solar cell device 1 </ b> D in which many of these solar cell arrays 19 are connected in parallel to an external circuit via a terminal 26 is formed. May be. In this case, similarly, by increasing the light receiving area of the sunlight 25, it is possible to increase the voltage and / or the current of the solar cell. That is, the generated voltage can be changed according to the number of the solar cells 10 provided in the solar cell array 19, and the generated current can be changed according to the number of the solar cell arrays 19 connected in parallel.

Further, as shown in FIG. 10, the panel-shaped solar cell devices 1 are arranged in a matrix on the entire surface of the hemispherical dome-shaped core material 28, and the lead pins of each solar cell device 1 are connected to terminals ( Hemispherical solar cell device 1E directly connected to an external circuit and / or connected in parallel via an unillustrated)
May be configured. In this case, not only can the light receiving area be enlarged, but even when the irradiation direction of the sunlight 25 changes, the sunlight 25 can always be received under the same light receiving conditions, and a higher voltage and / or a higher current as a solar cell can be obtained. Becomes possible.

Second Embodiment (FIGS. 11 and 12) The columnar solar cell device 30 is provided inside a case member 31 formed of a tube made of synthetic resin such as light-transmitting polycarbonate. The solar cell array 19 is housed in a buried state, and a reflection plate 34 made of a synthetic resin such as white scattering reflection type polycarbonate is adhered to the back side of this case member 31 (the back side in FIG. 11) in an intimate manner. is there. However, the rectifier diode 20 is unnecessary and has been removed. Also in this case, as shown in FIG. 12, similarly to the above-described embodiment, the pn junction 13 causes the photoexcited carriers (electrons and electrons) by the sunlight 25 directly incident on the solar cell 10 via the case member 31. Holes) to generate photovoltaics.

Further, any sunlight 25 irradiated on the case member 31 without being incident on the solar cell 10 is surely reflected on the hemispherical reflecting surface 34a of the reflector 34 and irradiated on the solar cell 10. Therefore, the power generation efficiency of the solar cell 10 can be improved. Here, similarly to the above-described embodiment, a cylindrical housing hole may be formed inside the case member 31, and the solar cell array 19 may be housed in the housing hole.

As shown in FIG. 13, a plurality of (for example, seven) cylindrical solar cell arrays 19 containing the solar cell array 19 shown in FIG. The solar cell module 19B is configured, and a solar cell module 40 is formed by filling a central portion of the solar cell module 19B with a synthetic resin reflecting member 41 made of white scattering reflection type polycarbonate or the like in close contact with the solar cell module. You may.

In this case, since the solar cell device 40 can receive the sunlight 25 from various directions, the light receiving direction of the sunlight 25 is not restricted, and the solar cell device 40 can efficiently receive the sunlight 25 from any direction. An electromotive force can be generated.
Further, as shown in FIG. 14, a plurality of solar cell arrays 19 shown in FIG.
Six flat solar cell panels housed in a flat case member 51 made of polycarbonate are formed in a hexagonal shape in plan view, and a reflective film 52 is formed on the inner side surface of each solar cell panel.
May be provided to configure the solar cell device 50.

In this case, since the solar cell device 50 can reflect the sunlight 25 incident from various directions by the reflection film 52 and receive it, the light receiving direction of the sunlight 25 is not restricted, and the solar light device 50 can be received from any direction. , And the photovoltaic power can be generated efficiently. Furthermore, since the inside of the cavity 53 of the solar cell device 50 can be ventilated, a rise in temperature due to the power generation action of the solar cell device 50 can be prevented.

By the way, instead of the above-described solar battery cell 10, a light emitting device using various light-to-light conversion type light-emitting diodes having a light-to-light conversion part and an electrode is constituted, and this light-emitting device is provided with various reflection members. The luminous efficiency may be increased. Here, as a spherical light emitting diode used in this light emitting device, for example, International Publication WO99 filed by the inventor
The spherical blue light emitting diode 60 described in U.S. Pat. No. 10,935 will be briefly described with reference to FIG.

This spherical blue light emitting diode 60 is made of a core material 6 having a diameter of about 1.5 mm and made of true spherical single crystal sapphire.
GaN buffer layer (about 30 nm thick) 62, n
-Type GaN layer (thickness of about _{3000nm) 63, In 0.4 Ga 0.6} N active layer (thickness of about 3 nm) 64, p-type Al _{0. 2} Ga _0.8 N layer (thickness: about 400 nm)
65, a p-type GaN layer (thickness: about 500 nm) 66 is formed in order, a window 67 having a diameter of about 600 μm reaching the n-type GaN layer 63 is opened, and a cathode 68 is provided. In addition, an anode 69 that contacts the surface of the p-type GaN layer 66 is formed. When a voltage is externally applied from the anode 69 to the cathode 68 and a forward current flows, the light emitting diode 60 emits blue light.

That is, in the panel-shaped solar cell device 1 shown in FIG. 1, the rectifier diode 20 is omitted, and instead of the solar cell module 19A, a plurality of light emitting diode arrays in which a plurality of light emitting diodes 60 are connected in series are arranged in parallel. A panel-shaped light emitting device is configured by applying light emitting diode modules arranged in parallel. In this case, the light generated by the light emitting diode module is emitted to both the front and back surfaces of the case member 5, but the light on the rear surface is also reflected by the reflector 5 to the front surface. The light can be efficiently emitted to the front surface side of the case member 5, and the luminous efficiency can be significantly increased. Furthermore,
Similarly, with respect to the various solar cell devices 1A to 1E described above, the rectifier diode 20 may be omitted and a light emitting diode module may be used instead of the solar cell module 19 to configure various light emitting devices.

Further, a columnar light emitting device is constructed by applying a light emitting diode array in which a plurality of light emitting diodes 60 are connected in series, instead of the solar cell array 19 of the cylindrical solar cell device 30 shown in FIG. In this case, the light generated by the light emitting diode array is emitted to both the front and back sides of the case member 31, but the light on the back side is reflected to the front side, so that all the light generated by the light emitting diode array is reflected by the reflector 34. The light can be efficiently reflected on the front surface side of the case member 31, and the luminous efficiency can be increased. Furthermore, similarly to the above-described various solar cell devices 40 and 50, a light-emitting diode module may be applied instead of the solar cell module, and various light-emitting devices may be configured.

A modification of the above embodiment will be described. 1] The aforementioned solar cell devices 1, 1A to 1E, 30, 40
For each of the above, a reflection film may be provided instead of the reflection plate. 2] The reflectors 5, 5A, 5B, 34 may be made of various synthetic resin materials that are opaque, have heat resistance, and can reflect light, in addition to the white scattering reflection type polycarbonate. 3] The reflecting surfaces of the reflecting plates 5, 5A, 5B and 34, which are the contact surfaces with the case member, may be formed in a fine wave shape, or the period and height of the waves may be changed irregularly.

4) The present invention is not limited to the above-described embodiment, and various modifications are added without departing from the spirit of the present invention, and a power generating device or a light emitting device using various spherical semiconductor elements. It is possible to apply to.

[0043]

According to the first aspect of the present invention, the case member includes the semiconductor element array and the light-transmissive case member, is provided in close contact with the back surface of the case member, and enters from the front surface side of the case member. Is provided with a reflecting member that can reflect light transmitted through the semiconductor element array toward the semiconductor element array, so that the semiconductor element array can receive not only direct light incident on the case member but also reflected light reflected by the reflecting member. , The photovoltaic power of the spherical semiconductor element is increased, and the photoelectric conversion efficiency can be significantly increased.

According to the second aspect of the present invention, there is provided a semiconductor element module in which a plurality of semiconductor element arrays in which a plurality of spherical semiconductor elements are connected in series are arranged in parallel in a plurality of rows, and a light-transmissive case member. The semiconductor element module is provided with a reflecting member which is provided in close contact with the surface of the case member and can reflect light incident on the surface side of the case member and transmitted through the case member toward the semiconductor element array. In addition, since the light reflected by the reflecting member can be received, the amount of received light increases, the photovoltaic power generated by the spherical semiconductor element can be further increased, and the photoelectric conversion efficiency can be significantly increased.

According to the third aspect of the present invention, since the reflection member is formed of a reflection film adhered to the back surface of the case member, the reflection member can be made small and inexpensive by using various reflection films such as a metal film. And the reflection efficiency can be secured. The other effects are the same as those of the first or second aspect. According to the invention of claim 4, since the reflecting member is made of a synthetic resin plate-like reflector adhered to the back surface of the case member, by using a plate-like reflector such as white scattering reflection type polycarbonate, The reflection efficiency can be ensured, and the case member can be reinforced. The other effects are the same as those of the first or second aspect.

According to the fifth aspect of the present invention, there is provided a semiconductor element array in which a plurality of spherical semiconductor elements are connected in series and a light-transmissive case member. Since a reflecting member capable of reflecting the light generated in the above and transmitted on the back side of the case member to the front side of the case member is provided, the light generated in the semiconductor element array is emitted to both the front and back surfaces of the case member. Since the light on the side is reflected by the reflecting member and emitted to the front side, all the light generated in the semiconductor element array can be efficiently reflected to the front side of the case member, and the luminous efficiency can be increased.

According to the sixth aspect of the present invention, there is provided a semiconductor element module in which a plurality of semiconductor element arrays in which a plurality of spherical semiconductor elements are connected in series are arranged in parallel in a plurality of rows, and a light-transmissive case member, and a back side of the case member. Since a reflecting member is provided which is capable of reflecting light generated at the semiconductor element array and transmitted on the back side of the case member to the front side of the case member, light generated at the semiconductor element module is provided on the case member. Although the light is emitted to both the front and back surfaces, the light on the back surface is reflected by the reflection member and emitted to the front surface, so that all the light generated in the semiconductor element module can be efficiently emitted to the front surface of the case member. As a result, the luminous efficiency can be significantly improved.

According to the seventh aspect of the present invention, since the reflection member is made of the reflection film adhered to the back surface of the case member, the same effect as in the third aspect can be obtained. Other claim 5
Or, the same effect as 6 can be obtained. According to the invention of claim 8, since the reflecting member is made of a synthetic resin plate-shaped reflector closely attached to the back surface of the case member, the same effect as in claim 4 is obtained. Other effects similar to those of the fifth or sixth aspect are exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view of a solar cell device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a solar cell device.

FIG. 3 is a sectional view of a solar battery cell.

FIG. 4 is a sectional view of a rectifier diode.

FIG. 5 is a vertical sectional front view taken along line EE of FIG. 2;

FIG. 6 is a partially enlarged longitudinal sectional front view of FIG. 5 according to a modified embodiment.

FIG. 7 is a diagram corresponding to FIG. 5 according to a modified embodiment.

FIG. 8 is a plan view of a solar cell device including a plurality of panels.

FIG. 9 is a plan view of a solar cell device in which a number of solar cell arrays are arranged in parallel.

FIG. 10 is a perspective view of a hemispherical solar cell device.

FIG. 11 is a sectional view of a solar cell device according to a second embodiment.

12 is a vertical sectional front view taken along line LL of FIG. 11;

FIG. 13 is a perspective view of a solar cell device including a plurality of columnar solar cell modules.

FIG. 14 is a perspective view of a solar cell device in which a plurality of solar cell panels are combined.

FIG. 15 is a sectional view of a spherical blue light emitting diode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel-shaped solar cell device 1A-1E Solar cell device 2 Case member 5 Reflector 5A, 5B Reflector 5a Hemispherical reflective surface 10 Solar cell 15 Positive electrode 16 Negative electrode 19 Solar cell array 19A Solar cell module 19B Solar cell module Reference Signs List 25 solar light 30 cylindrical solar cell device 34 reflector 40 solar cell device 50 solar cell device 60 spherical blue light emitting diode

Claims (8)

[Claims] A semiconductor element array in which a plurality of spherical semiconductor elements each having a photovoltaic power generation section formed on a semiconductor spherical crystal and a pair of electrodes formed at both ends are connected in series;
In a power generating apparatus including a light-transmissive case member for accommodating the semiconductor element array, a semiconductor device is provided in close contact with the back surface side of the case member, and transmits light incident from the front surface side of the case member and transmitted through the case member to a semiconductor. A power generating apparatus using a spherical semiconductor element, comprising a reflecting member capable of reflecting light toward an element array. 2. A plurality of semiconductor element arrays in which a plurality of spherical semiconductor elements each having a photovoltaic power generation section formed on a semiconductor spherical crystal and a pair of electrodes formed at both ends are connected in series are arranged in parallel. In a power generating apparatus including a semiconductor element module and a light-transmissive case member for housing the semiconductor element module, the case member is provided in close contact with the back side of the case member, and enters the case member from the front side of the case member. A power generating apparatus using a spherical semiconductor element, comprising a reflecting member capable of reflecting transmitted light toward a semiconductor element array. 3. The power generation device using a spherical semiconductor element according to claim 1, wherein the reflection member is formed of a reflection film adhered to a back surface of a case member. 4. The power generator according to claim 1, wherein the reflection member is made of a synthetic resin plate-shaped reflector that is in close contact with the back surface of the case member. 5. A semiconductor element array in which a plurality of spherical semiconductor elements formed by forming an electro-optical converter on a semiconductor spherical crystal and forming a pair of electrodes at both ends are connected in series, and the semiconductor element array is accommodated. A light-transmitting case member provided with a light-transmissive case member, wherein light generated in the semiconductor element array and transmitted through the back surface side of the case member is reflected to the front surface side of the case member. A light emitting device using a spherical semiconductor element, wherein a light reflecting member is provided. 6. A semiconductor element in which a plurality of semiconductor element arrays in which a plurality of spherical semiconductor elements each having an electro-optical conversion portion formed on a semiconductor spherical crystal and a pair of electrodes formed at both ends are connected in series are arranged in parallel. A light emitting device comprising a module and a light-transmissive case member for accommodating the semiconductor element module, wherein the light-emitting device is provided in close contact with the back side of the case member and is generated in the semiconductor element array and transmitted to the back side of the case member. A light emitting device using a spherical semiconductor element, wherein a reflecting member capable of reflecting the generated light to the surface side of the case member is provided. 7. The light emitting device using a spherical semiconductor element according to claim 5, wherein the reflection member is made of a reflection film adhered to a back surface of a case member. 8. The light emitting device using a spherical semiconductor element according to claim 5, wherein the reflection member is made of a synthetic resin plate-like reflector that is adhered to the back surface of the case member.