TWI478363B - Bi-facial thin film solar cell module - Google Patents

Bi-facial thin film solar cell module Download PDF

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Publication number
TWI478363B
TWI478363B TW101140566A TW101140566A TWI478363B TW I478363 B TWI478363 B TW I478363B TW 101140566 A TW101140566 A TW 101140566A TW 101140566 A TW101140566 A TW 101140566A TW I478363 B TWI478363 B TW I478363B
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TW
Taiwan
Prior art keywords
thin film
solar cell
film solar
conductive layer
double
Prior art date
Application number
TW101140566A
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Chinese (zh)
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TW201419558A (en
Inventor
Chih Hung Hsiao
Chao Chieh Tsai
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Nexpower Technology Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Description

Double-sided thin film solar cell module

The invention relates to a thin film solar cell module, in particular to a double-sided thin film solar cell module capable of absorbing light on both sides and converting into electric power.

At present, international energy prices are gradually rising, and all countries are committed to the research and application of solar cells to obtain cheap and environmentally friendly energy. Thin-film solar cells can be fabricated using a variety of inexpensive materials such as glass, plastic, ceramics, and graphite. The thickness of the film that can be produced is only a few millimeters. Therefore, compared with the silicon wafer solar cell, the thin film solar cell can save a large amount of raw materials under the same light receiving area, and has excellent energy conversion efficiency. In addition to the plane, the thin film solar cell can also have flexibility. Made into a non-planar structure that can be combined with a building or become part of a building.

However, in general, thin-film solar cells can only absorb light on one side and are mostly opaque planes. The light on the back side is completely unusable. When installed in a window of a building, it can not only absorb light of one side but also enhance the solar cell. The power generation efficiency will also completely obstruct the user's line of sight, causing the user to completely obscure any object located on the other side of the thin film solar cell, thus limiting the use of the thin film solar cell on the building. The loss of view of the window of a moving vehicle is an unacceptable limitation, so conventional or thin-film solar cells are not suitable for installation. The window of a movable vehicle.

In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a double-sided solar cell module for absorbing light on both sides and converting it into electric power to improve the disadvantage that a general solar cell can only receive light on one side. Further, the present invention can further cut the inner layer of the double-sided thin film solar cell module by laser light to form a plurality of gratings having equal widths, so that the double-sided thin film solar cell module can be used in addition to the power generation function. This can produce a visual perspective for an object that moves vertically with the grating direction and whose relative velocity is greater than a fixed value of the preset value.

According to an object of the present invention, a double-sided thin film solar cell module comprising a first thin film solar cell, a second thin film solar cell and a glue layer is provided. The first thin film solar cell is used to convert light that is irradiated toward the first thin film solar cell into electric power, and the second thin film solar cell is used to convert light that is irradiated toward the second thin film solar cell into electric power. In addition, the glue layer is an electrically insulating material for bonding and insulating the first thin film solar cell and the second thin film solar cell.

In other words, the first thin film solar cell is composed of a transparent substrate, a first conductive layer, a light absorbing layer and a second conductive layer which are sequentially laminated.

In other words, the second thin film solar cell is composed of a transparent substrate, a first conductive layer, a light absorbing layer and a second conductive layer which are sequentially laminated.

Further, the transparent substrate of the first thin film solar cell and the transparent substrate of the second thin film solar cell are respectively a transparent plastic substrate or a transparent glass substrate.

Further, the materials of the light absorbing layer of the first thin film solar cell and the light absorbing layer of the second thin film solar cell are composite amorphous germanium and microcrystalline germanium, respectively. (amorphous silicon/microcrystalline silicon, a-Si/μ-Si).

Further, the materials of the first conductive layer and the second conductive layer of the first thin film solar cell and the first conductive layer and the second conductive layer of the second thin film solar cell are respectively transparent conductive oxide (TCO).

Further, the material of the glue layer is polyvinyl butyral/ethylene-vinyl acetate copolymer (PVA/EVA), and the thickness of the glue layer is greater than 0.9 mm.

Further, the glue layer is adhered between the second conductive layer of the first thin film solar cell and the second conductive layer of the second thin film solar cell.

According to the object of the present invention, a double-sided thin film solar module further comprises a first thin film solar cell; a second thin film solar cell; an electrically insulating glue layer, the glue layer is glued to the first thin film solar cell And the second thin film solar cell; and the plurality of gratings are disposed on the first thin film solar cell and the second thin film solar cell that have been glued, so that the first thin film solar cell and the second thin film solar cell can be simultaneously converted The light irradiated by the first thin film solar cell or the second thin film solar cell becomes electric power.

In other words, the first thin film solar cell is composed of a transparent substrate, a first conductive layer, a light absorbing layer and a second conductive layer.

In other words, the second thin film solar cell is composed of a transparent substrate, a first conductive layer, a light absorbing layer and a second conductive layer.

Further, the transparent substrate of the first thin film solar cell and the second thin film solar power The material of the transparent substrate of the pool is a transparent plastic substrate or a transparent glass substrate.

Further, the materials of the light absorbing layer of the first thin film solar cell and the light absorbing layer of the second thin film solar cell are composite amorphous germanium and microcrystalline germanium, respectively.

Further, the materials of the first conductive layer and the second conductive layer of the first thin film solar cell and the first conductive layer and the second conductive layer of the second thin film solar cell are respectively transparent conductive oxides.

Further, the material of the glue layer is polyvinyl butyral or ethylene vinyl acetate copolymer, and the thickness of the glue layer is greater than 0.9 mm.

Further, the glue layer is adhered between the second conductive layer of the first thin film solar cell and the second conductive layer of the second thin film solar cell.

Further, the plurality of gratings penetrate the light absorbing layer of the first thin film solar cell and the second conductive layer, the glue layer, the second conductive layer of the second thin film solar cell, and the light absorbing layer, and are located in the first thin film solar cell. Between the first conductive layer and the first conductive layer of the second thin film solar cell, the width of the single grating is greater than 150 μm, and the total width of the plurality of gratings is greater than 5% of the width of the thin film solar cell module.

Further, when the relative velocity between the object of the double-sided thin film solar cell module equipped with the plurality of gratings and the external object is greater than 0.5 km/hr, the double-sided thin film solar cell module has the function of visual perspective. .

As described above, the double-sided thin film solar cell module according to the present invention may have one or more of the following advantages:

(1) The double-sided thin film solar cell module can receive light on both sides, and according to the light The electrical effect produces electricity.

(2) After the plurality of gratings are arranged, the double-sided thin film solar cell module can produce a visual perspective for an object that moves vertically with its grating direction and whose relative velocity is greater than a fixed value.

1‧‧‧First thin film solar cell

2‧‧‧Second thin film solar cell

3‧‧‧ inner layer

10‧‧‧Transparent substrate for the first thin film solar cell

20‧‧‧First conductive layer of the first thin film solar cell

30‧‧‧Light absorbing layer of the first thin film solar cell

40‧‧‧Second conductive layer of the first thin film solar cell

50‧‧‧ glue layer

60‧‧‧Second conductive layer of the second thin film solar cell

70‧‧‧Light absorbing layer of the second thin film solar cell

80‧‧‧The first conductive layer of the second thin film solar cell

90‧‧‧Transparent substrate for second thin film solar cells

100‧‧‧Raster

L1‧‧‧First path

L2‧‧‧ second path

L3‧‧‧ third path

L4‧‧‧ fourth path

L5‧‧‧ fifth path

L6‧‧‧ sixth path

L7‧‧‧ seventh path

L8‧‧‧ eighth path

1 is a schematic cross-sectional view showing a first embodiment of a double-sided thin film solar cell module of the present invention.

2 is a schematic cross-sectional view showing a second embodiment of the double-sided thin film solar cell module of the present invention.

The technical features, contents, and advantages of the present invention, as well as the advantages thereof, can be understood by the present inventors, and the present invention will be described in detail with reference to the accompanying drawings. The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. First described.

Please refer to FIG. 1 , which is a schematic diagram of a first embodiment of a double-sided solar cell module of the present invention for displaying the structure of a double-sided thin film solar cell module. In the first embodiment, the double-sided thin film solar cell module includes a first thin film solar cell 1, a second thin film solar cell 2, and a bonding layer 50. The first thin film solar cell 1 is configured to convert light that is irradiated toward the first thin film solar cell (for example, in a first direction) into electricity, and the second thin film solar cell 2 is used to convert the light toward the second thin film solar cell (for example, in the second direction) The light becomes electricity. In addition, the glue layer 50 is an electrically insulating material for bonding and insulating the first thin film solar cell 1 and the second film too. Solar battery 2.

In other words, the first thin film solar cell 1 is composed of a transparent substrate 10, a first conductive layer 20, a light absorbing layer 30, and a second conductive layer 40.

In other words, the second thin film solar cell 2 is composed of a transparent substrate 90, a first conductive layer 80, a light absorbing layer 70, and a second conductive layer 60.

Further, the materials of the transparent substrate 10 of the first thin film solar cell 1 and the transparent substrate 90 of the second thin film solar cell 2 are respectively a transparent plastic substrate or a transparent glass substrate.

Further, the materials of the light absorbing layer 30 of the first thin film solar cell 1 and the light absorbing layer 70 of the second thin film solar cell are composite amorphous germanium and microcrystalline germanium, respectively.

Further, the materials of the first conductive layer 20 and the second conductive layer 40 of the first thin film solar cell 1 and the first conductive layer 60 and the second conductive layer 80 of the second thin film solar cell 2 are respectively transparent conductive oxides.

Further, the material of the glue layer 50 is polyvinyl butyral or ethylene vinyl acetate copolymer, and the thickness of the glue layer 50 is greater than 0.9 mm.

Further, the glue layer 50 is adhered between the second conductive layer 40 of the first thin film solar cell 1 and the second conductive layer 60 of the second thin film solar cell 2.

It is well known that light can be refracted and reflected when passing through an interface between dissimilar media, and the condition of refraction or reflection is determined by the incident angle of the ray and the relative refractive index between the two dielectric values.

When the light is incident from the first path L1, the light penetrates through the transparent substrate 90 of the second thin film solar cell 2 and the first conductive layer 80, and then in the second thin film solar cell 2 The first conductive layer 80 and the absorbing layer 70 form a primary refraction between the first conductive layer 80 and the absorbing layer 70, and then enter the inner layer 3 of the double-sided thin film solar cell module, and finally absorbed by the light absorbing layer 30 of the first thin film solar cell 1.

When the light is incident from the second path L2, the light penetrates the transparent substrate 90 of the second thin film solar cell 2 and the first conductive layer 80, and then the first conductive layer 80 and the absorption layer of the second thin film solar cell 2. A primary refraction is formed between 70, and then a reflection is formed between the absorption layer 70 and the second conductive layer 80 of the second thin film solar cell 2, and then in the first conductive layer 80 and the absorption layer 70 of the second thin film solar cell 2. A reflection is formed between them and finally absorbed by the absorption layer 70 of the second thin film solar cell 2.

When the light is incident from the third path L3, the light penetrates the transparent substrate 10 of the first thin film solar cell 1 and the first conductive layer 20, and the absorption layer 30 and the second conductive layer 40 of the first thin film solar cell 1 A reflection is formed between them and finally absorbed by the absorbing layer 30.

When the light is incident from the third path L3, the light penetrates the transparent substrate 10 of the first thin film solar cell 1 and the first conductive layer 20, and the absorption layer 30 and the second conductive layer 40 of the first thin film solar cell 1 A first refraction is formed between the second conductive layer 40 and the bonding layer 50 of the first thin film solar cell 1 , and then a reflection is formed between the bonding layer 50 and the second thin film solar cell, and finally the first thin film solar cell Absorbed by the absorption layer 30 of 1. It can be seen that the double-sided solar cell module of the present invention can effectively absorb and utilize the light irradiated on both sides thereof.

Please refer to FIG. 2, which is a schematic diagram of a second embodiment of a double-sided solar cell module of the present invention for displaying the structure of a double-sided thin film solar cell module having a plurality of gratings.

A double-sided thin film solar cell module according to a second embodiment of the present invention is suitable for absorbing light on both sides and converting into electric power, comprising: a first thin film solar cell; a second thin film solar cell; and an electrical insulating a glue layer, a glue layer is glued to the first thin film solar cell and the second thin film solar cell; and a plurality of gratings are disposed on the glued first thin film solar cell and the second thin film solar cell to make the first thin film solar cell and the second The thin film solar cell can simultaneously convert light that is directed toward the first thin film solar cell or the second thin film solar cell into electricity. The second embodiment of the present invention differs from the first embodiment only in that the double-sided thin film solar cell module of the second embodiment further has a grating 100 for allowing light to pass through.

Continuing, wherein the plurality of gratings penetrate the light absorbing layer of the first thin film solar cell and the second conductive layer, the glue layer, the second conductive layer of the second thin film solar cell, and the light absorbing layer, and are located in the first thin film solar energy Between the first conductive layer of the battery and the first conductive layer of the second thin film solar cell. When the light is irradiated on either side of the double-sided thin film solar cell module, the light can pass through the transparent substrate of the thin film solar module and the first conductive layer enters the grating, and then the grating enters the first of the other thin film solar module. After the conductive layer and the transparent substrate are exposed, the effect of double-sided light transmission is achieved. The width of a single grating is greater than 150 μm, and the total width of the plurality of gratings is greater than 5% of the width of the double-sided thin film solar cell module.

When the light is incident from the fifth path L5, the light penetrates the transparent substrate 90 of the second thin film solar cell 2 and the first conductive layer 80, and then the first conductive layer 80 and the absorption layer of the second thin film solar cell 2. A refraction is formed between 70 and finally absorbed by the absorption layer 70 of the second thin film solar cell 2.

When the light is incident from the sixth path L6, the light penetrates the transparent substrate 90 of the second thin film solar cell 2 and the first conductive layer 80, and then passes through the grating 100 to enter the first thin The absorbing layer 30 of the film solar cell 1 is absorbed.

When the light is incident from the seventh path L7, the light penetrates through the transparent substrate 10 of the first thin film solar cell 1 and the first conductive layer 20, and the absorption layer 30 and the second conductive layer 40 of the first thin film solar cell 1 A reflection is formed between them and finally absorbed by the absorbing layer 30.

When the light is incident from the eighth path L8, the light penetrates the transparent substrate 10 of the first thin film solar cell 1 and the first conductive layer 20, and then enters the grating 100, and then the grating 100 and the second thin film solar cell 2 The interface forms a reflection and is finally absorbed by the absorbing layer 70.

In general, the human eye will temporarily hold the image seen on the retina for 1/24 of a second. The illusion of "still exists" for the image that just disappeared. Using this principle, the film captures the ever-changing light and shadow, shoots the images on the film, and then quickly projects them onto the screen, playing 24 frames per second, giving the viewer a visual effect before the previous image has disappeared. , immediately connected to the next image, thus producing the effect of continuous activities, this is the so-called "visual persistence" principle.

In view of the principle of persistence of vision, when a double-sided thin film solar cell module having a plurality of gratings 100 is assembled on an object, a plurality of gratings 100 are related to the moving direction of the object or to observe the movement of the external object. The direction can be vertical. At this time, if the relative velocity value between the object having the double-sided thin film solar cell module having the plurality of gratings 100 and the external object or environment is greater than 0.5 km/hr, the double-sided thin film solar energy having the plurality of gratings 100 The battery module will produce an approximately transparent effect that allows the user to view the external object or environment through the grating 100.

Further, when a plurality of gratings 100 are mounted on the double-sided thin film solar cell module The double-sided thin film solar cell module has a function of visual see-through when the relative velocity between the object and the external object is greater than 0.5 km/hr.

In summary, the double-sided thin film solar cell module of the present invention mainly redesigns and combines the design of the conventional single-sided thin film solar cell, so that the double-sided thin film solar cell module can receive light on both sides and generate electricity. Furthermore, the double-sided thin film solar cell module of the present invention can use a laser to cut off a portion of the inner layer to form a plurality of gratings, so that the object can be visually moved perpendicularly to the grating direction and the relative velocity is greater than a fixed value. The role of perspective.

The embodiments described above are merely illustrative of the technical spirit and the features of the present invention, and the objects of the present invention can be understood by those skilled in the art, and the scope of the present invention cannot be limited thereto. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention.

1‧‧‧First thin film solar cell

2‧‧‧Second thin film solar cell

3‧‧‧ inner layer

10‧‧‧Transparent substrate for the first thin film solar cell

20‧‧‧First conductive layer of the first thin film solar cell

30‧‧‧Light absorbing layer of the first thin film solar cell

40‧‧‧Second conductive layer of the first thin film solar cell

50‧‧‧ glue layer

60‧‧‧Second conductive layer of the second thin film solar cell

70‧‧‧Light absorbing layer of the second thin film solar cell

80‧‧‧The first conductive layer of the second thin film solar cell

90‧‧‧Transparent substrate for second thin film solar cells

100‧‧‧Raster

L5‧‧‧ fifth path

L6‧‧‧ sixth path

L7‧‧‧ seventh path

L8‧‧‧ eighth path

Claims (17)

  1. A double-sided thin film solar cell module suitable for absorbing light on both sides and converting into electric power, comprising: a first thin film solar cell for converting light irradiated toward the first thin film solar cell into electric power; and a second film a solar cell for converting light irradiated toward the second thin film solar cell into electricity; and an electrically insulating glue layer for gluing the first thin film solar cell and the second thin film solar cell; wherein The material of the glue layer is polyvinyl butyral or ethylene vinyl acetate copolymer, and the thickness of the glue layer is greater than 0.9 mm.
  2. The double-sided thin film solar cell module according to claim 1, wherein the first thin film solar cell comprises a transparent substrate, a first conductive layer, a light absorbing layer and a second Conductive layer.
  3. The double-sided thin film solar cell module according to claim 2, wherein the second thin film solar cell comprises a transparent substrate, a first conductive layer, a light absorbing layer and a second Conductive layer.
  4. The double-sided thin film solar cell module according to claim 3, wherein the transparent substrate of the first thin film solar cell and the transparent substrate of the second thin film solar cell are respectively a transparent plastic substrate. Or a transparent glass substrate.
  5. The double-sided thin film solar cell module according to claim 3, wherein the light absorbing layer of the first thin film solar cell and the second thin film solar cell The materials of the light absorbing layer are composite amorphous germanium and microcrystalline germanium.
  6. The double-sided thin film solar cell module according to claim 3, wherein the first conductive layer of the first thin film solar cell and the second conductive layer and the first conductive layer of the second thin film solar cell And the material of the second conductive layer is a transparent conductive oxide.
  7. The double-sided thin film solar cell module of claim 6, wherein the glue layer is adhered to the second conductive layer of the first thin film solar cell and the second conductive layer of the second thin film solar cell between.
  8. A double-sided thin film solar cell module suitable for double-sided absorption of light and converted into electric power, comprising: a first thin film solar cell; a second thin film solar cell; an electrically insulating glue layer, the glue layer is glued The first thin film solar cell and the second thin film solar cell; and a plurality of gratings on the first thin film solar cell and the second thin film solar cell that have been glued to make the first thin film solar cell and the second thin film The solar cell can simultaneously convert the light that is irradiated toward the first thin film solar cell or the second thin film solar cell into electricity; wherein the glue layer is made of polyvinyl butyral or ethylene vinyl acetate copolymer, and the glue layer is The thickness is greater than 0.9 mm.
  9. The double-sided thin film solar cell module according to claim 8, wherein the first thin film solar cell comprises a transparent substrate, a first conductive layer, a light absorbing layer and a second Conductive layer.
  10. The double-sided thin film solar cell module according to claim 9, wherein the second thin film solar cell sequentially overlaps a transparent substrate, a first conductive layer, and a light a line absorbing layer and a second conductive layer.
  11. The double-sided thin film solar cell module according to claim 10, wherein the transparent substrate of the first thin film solar cell and the transparent substrate of the second thin film solar cell are respectively a transparent plastic substrate. Or a transparent glass substrate.
  12. The double-sided thin film solar cell module according to claim 10, wherein the light absorbing layer of the first thin film solar cell and the light absorbing layer of the second thin film solar cell are respectively composite amorphous矽 and microcrystalline 矽.
  13. The double-sided thin film solar cell module according to claim 10, wherein the first conductive layer of the first thin film solar cell and the second conductive layer and the first conductive layer of the second thin film solar cell And the material of the second conductive layer is a transparent conductive oxide.
  14. The double-sided thin film solar cell module of claim 13, wherein the glue layer is adhered to the second conductive layer of the first thin film solar cell and the second conductive layer of the second thin film solar cell between.
  15. The double-sided thin film solar cell module of claim 14, wherein the plurality of gratings penetrate the light absorbing layer of the first thin film solar cell and the second conductive layer, the glue layer, the first The second conductive layer of the thin film solar cell and the light absorbing layer are located between the first conductive layer of the first thin film solar cell and the first conductive layer of the second thin film solar cell.
  16. The double-sided thin film solar cell module according to claim 15, wherein a width of each of the plurality of gratings is greater than 150 μm, and a total width of the plurality of gratings is wider than a width of the double-sided thin film solar cell module The system is greater than 5%.
  17. The double-sided thin film solar cell module of claim 16, wherein the relative velocity between the object of the double-sided thin film solar cell module and the external object is greater than The double-sided thin film solar energy at 0.5km/hr The battery module has the function of visual perspective.
TW101140566A 2012-11-01 2012-11-01 Bi-facial thin film solar cell module TWI478363B (en)

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TWI478363B true TWI478363B (en) 2015-03-21

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070181176A1 (en) * 2005-06-20 2007-08-09 Solyndra, Inc. Bifacial elongated solar cell devices
TW201030994A (en) * 2009-02-12 2010-08-16 Nexpower Technology Corp Two sided light absorbing type solar cell
US7804023B2 (en) * 2007-04-19 2010-09-28 Industrial Technology Research Institute Bifacial thin film solar cell and method for making the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070181176A1 (en) * 2005-06-20 2007-08-09 Solyndra, Inc. Bifacial elongated solar cell devices
US7804023B2 (en) * 2007-04-19 2010-09-28 Industrial Technology Research Institute Bifacial thin film solar cell and method for making the same
TW201030994A (en) * 2009-02-12 2010-08-16 Nexpower Technology Corp Two sided light absorbing type solar cell

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