TWI437719B - Thin film solar cell module and manufacturing method thereof - Google Patents

Description

Thin film solar cell module and manufacturing method thereof

The invention relates to a solar cell module, in particular to a thin film solar cell module and a manufacturing method thereof.

Referring to FIG. 1 and FIG. 2, US 2008/0121264 A1 discloses a thin film solar cell module 1 comprising: a substrate 11 , an insulating layer 12 formed on the substrate 11 , and a plurality of strips formed on the insulating layer 12 and a lower electrode layer 132 spaced apart by the plurality of first trenches 131, and a plurality of semiconductors formed on the lower electrode layers 132 to cover the first trenches 131 and spaced apart by the plurality of second trenches 141, respectively A layer 142, and a plurality of strips are formed on the semiconductor layers 142 to cover the second trenches 141 and are separated by a plurality of third trenches 151. The thin film solar cell module 1 is electrically connected in series with the semiconductor layers 142 by the upper and lower electrode layers 132 and 152, and each pair of upper and lower electrode layers 132 and 152 and their corresponding semiconductors. The sandwich structure formed by layer 142 collectively defines a thin film solar cell 16.

Each of the semiconductor layers 142 has a width and a thickness, and the width of the semiconductor layers 142 is increased from the center of the substrate 11 toward the edge of the substrate 11. Since the thickness of the semiconductor layer 142 of the thin film solar cell module 1 is decreasing from the center of the substrate 11 toward the edge of the substrate 11, it will cause short-circuit current (Isc) of the thin film solar cell 16 adjacent to the edge of the substrate 11. )decline. Therefore, the thin film solar cell module 1 mainly increases the width of the semiconductor layers 142 from the center of the substrate 11 toward the edge of the substrate 11 to thereby improve the problem of a decrease in the short-circuit current.

The design concept of the pattern of the thin film solar cell module 1 is mainly due to the fact that the thickness of the semiconductor layers 142 is decreasing from the center of the substrate 11 toward the edge of the substrate 11, so that the width of the semiconductor layer 142 must be increased in the same direction. However, for a limited module area, if the invention is to be implemented by this design concept, it is not necessary to sacrifice the total number of the thin film solar cells 16, that is, the thin film solar energy located at the center of the substrate 11 must be sacrificed. The area of the battery 16. Therefore, the overall output power of the thin film solar cell module 1 is also lacking in its contribution; on the other hand, the pattern design of the module is complicated.

According to the above description, the uniformity of the short-circuit current of each thin film solar cell of the thin film solar cell module is maintained under the condition of limited module area, so as to increase the maximum output power of the thin film solar cell module and simplify the module pattern. The design is a topic to be solved by this technology.

Accordingly, it is an object of the present invention to provide a thin film solar cell module.

Another object of the present invention is to provide a method of fabricating a thin film solar cell module.

Yet another object of the present invention is to provide another thin film solar cell module.

Thus, the thin film solar cell module of the present invention comprises: a substrate, and a battery unit. The substrate has one of a first side portion and a second side portion disposed oppositely. The battery unit is disposed on the substrate, and has a plurality of first edge thin film solar cells, at least three basic thin film solar cells, and a plurality of base thin film solar cells spaced apart from each other from the first side portion to the second side portion of the substrate A second edge thin film solar cell. The thin film solar cells are substantially parallel to each other, and the average widths of the first and second edge thin film solar cells are W _L1 and W _L2 , respectively, and the widths of the basic thin film solar cells are equal and the average width is W _S , W _L1 >W _S , W _L2 >W _S .

In addition, the manufacturing method of the thin film solar cell module of the present invention comprises the following steps:

(a) forming, on a substrate having a first side portion and a second side portion oppositely disposed, a plurality of first electrode layers arranged from the first side portion to the second side portion;

(b) forming an absorbing layer covering the first electrode layers on the substrate;

(c) cutting the absorbing layer to define a plurality of first edge absorbing layers, at least three basic absorbing layers, and from the first side to the second side adjacent to the substrate on the first electrode layers a plurality of second edge absorbing layers; and

(d) forming, on the absorbing layers, a plurality of second electrode layers arranged in sequence from the first side portion adjacent to the substrate to the second side portion;

Wherein the cutting condition of the step (c) is set such that the average widths of the first and second edge absorbing layers are W _L1 and W _L2 , respectively, and the widths of the basic absorbing layers are equal and the average width is W _S , W _L1 > W _S , W _L2 > W _S .

Moreover, another thin film solar cell module of the present invention comprises: a substrate, and a battery unit. The substrate has one of a first side portion and a second side portion disposed oppositely. The battery unit is disposed on the substrate, and has 10 or less first edge thin film solar cells and 90 to 180 bases spaced apart from each other from the first side portion to the second side portion of the substrate. Thin film solar cells, and 10 or less second edge thin film solar cells. The thin film solar cells are substantially parallel to each other, and the average widths of the first and second edge thin film solar cells are W _L1 and W _L2 , respectively, and the widths of the basic thin film solar cells are equal and the average width is W _S , W _L1 >W _S , W _L2 >W _S .

The invention has the advantages of maintaining the uniformity of the short-circuit current and the short-circuit current density of each thin film solar cell under the condition of limited module area, thereby improving the maximum output power of the thin film solar cell module and simplifying the module pattern. the design of.

<Detailed Description of the Invention>

The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments,

Referring to FIG. 3 and FIG. 4f, a preferred embodiment of the thin film solar cell module of the present invention comprises: a substrate 2, a battery unit 3, and two contacts 4 for electrically connecting the battery unit 3 in series.

The substrate 2 has a first side portion 21 and a second side portion 22 disposed oppositely. The battery unit 3 is disposed on the substrate 2 and has a plurality of first edge thin film solar energy spaced apart from each other from the first side portion 21 adjacent to the substrate 2 to the second side portion 22 adjacent to the substrate 2 The battery 31, at least three base thin film solar cells 32, and a plurality of second edge thin film solar cells 33. The thin film solar cells 31, 32, 33 are substantially parallel to each other. The average widths of the first and second edge thin film solar cells 31, 33 are W _L1 and W _L2 , respectively, and the widths of the basic thin film solar cells 32 are equal and the average width is W _S , W _L1 > W _S , W _L2 > W _S .

Preferably, 1.03 ≦ W _L1 / W _S ≦ 1.20; 1.03 ≦ W _L2 / W _S ≦ 1.20; more preferably, 1.05 ≦ W _L1 / W _S ≦ 1.08; 1.05 ≦ W _L2 / W _S ≦ 1.08.

Preferably, the width of the first edge thin film solar cells 31 is ≦30 cm, and the width of the second edge thin film solar cells 33 is ≦30 cm; more preferably, the first edge thin film solar cells The width of 31 is ≦10 cm, and the width of the second edge thin film solar cells 33 is ≦10 cm.

Preferably, each of the thin film solar cells 31, 32, 33 has a first electrode layer 311, 321, 331, a second electrode layer 312, 322, 332, and a sandwiching electrode layer 311, 321 Absorbing layers 313, 323, 333 between 331, 312, 322, 332, the first electrode layer 311 respectively adjacent to the first side portion 21 of the substrate 2 and the closest to the substrate 2 The second electrode layer 332 of the second side portion 21 is electrically connected in series, and the thicknesses of the absorption layers 313, 323, and 333 of the thin film solar cells 31, 32, and 33 are normalized to be 0.85 to 1.0. More preferably, the thicknesses of the absorption layers 313, 323, and 333 of the thin film solar cells 31, 32, and 33 are normalized to be between 0.9 and 1.0.

Preferably, the preferred embodiment of the present invention further includes a frame 5 surrounding the first side portion 21 and the second side portion 22 of the substrate 2 and allowing sunlight to pass through the substrate 2 to illuminate the battery. Unit 3.

It should be noted here that since the thin film solar cell module has a limited amount of light entering the first and second side portions 21 and 22 of the substrate 2 (ie, at the edge of the module), it will cause adjacent to the substrate. The short-circuit current and the short-circuit current density at the first and second side portions 21, 22 of 2 are lowered. However, after considering that photons enter the absorption layers 313, 323, and 333, they are not limited to photons absorbed by the absorption layers 313, 323, and 333, and have specific wavelengths (e.g., far infrared bands). It may also be laterally transferred within the absorption layers 313, 323, 333 to cause superposition of quantum efficiency (QE); in other words, to raise the first and second side portions 21, 22 adjacent to the substrate 2. The widths of the first and second edge thin film solar cells 31, 33 (i.e., the widths of the absorption layers 313, 333) are advantageous for superposition of quantum efficiency and thereby improve their photoelectric conversion efficiency, short circuit current and short circuit current density. In addition, the coating quality (e.g., thickness uniformity) of the absorbing layers 313, 323, and 333 also determines the overall short circuit current density of the thin film solar cell module. Therefore, the present invention mainly utilizes the concepts of W _L1 >W _S , W _L2 >W _S and uniform thickness, so that the short-circuit current and short-circuit current density of each thin film solar cell 31, 32, 33 are uniformized, thereby improving the mode. The overall maximum output power of the group.

Preferably, the total number of base thin film solar cells 32 of the battery unit 3 increases as the width W of the substrate 2 increases; the width W of the substrate 2 is between 110 mm and 1500 mm; The total number of base thin film solar cells 32 of unit 3 is between 3 and 180 strips. When the width of the substrate 2 is 110 mm, the basic thin film solar cells 32 of the battery unit 3 are between 3 and 18; when the width W of the substrate 2 is 1100 mm, the battery unit 3 The base thin film solar cell 32 is between 90 and 180 strips. It should be noted that although the present invention has defined above, the total number of the basic thin film solar cells 32 increases as the width W of the substrate 2 increases, and is between 3 and 180 However, each of the thin film solar cells 31, 32, 33 can be cut by laser cutting to be cut into a plurality of segments (not shown), which is a technical concept known to those skilled in the art related to thin film solar cells; therefore, each The base thin film solar cell 32 is further cut through the laser to be cut into a plurality of segments, and is also within the scope of the present invention.

In one embodiment, the width of the first edge thin film solar cells 31 is increased from the base thin film solar cells 32 toward the first side portion 21 of the substrate 2; the second edge thin film solar cells 33 The width is increased from the base thin film solar cells 32 toward the second side 22 of the substrate 2.

In another embodiment, the first and second edge thin film solar cells 31, 33 have the same width.

It should be noted that, according to the concept of the present invention, the thin film solar cell module of the preferred embodiment is applicable not only to a two-terminal (2T) module but also to a three-terminal (three terminal, 3T) above modules. When the preferred embodiment of the present invention is a module of a 3T structure, it includes two battery cells 3 (not shown) which are symmetrically separated by another contact; the difference between the module and the 2T structure module Only the battery unit 3 closer to the first side portion 21 of the substrate 2 has only the first edge thin film solar cell 31 and the base thin film solar cell 32, and the battery unit 3 closer to the second side portion 22 of the substrate 2 only There is a second edge thin film solar cell 33 and a base thin film solar cell 32, and the battery cells 3 are electrically connected in parallel with each other. The electrical connection relationship of the module structure of 2T or more is not a technical feature of the present invention, and will not be further described herein.

Absorbing layers 313, 323, 333 of the thin film solar cells 31, 32, 33 suitable for use in the present invention are made of a material selected from the group consisting of amorphous Si, microcrystalline Micro-crystalline Si, CuInS ₂ , CuIn _x Ga _1-x S ₂ , CuInS _y Se _2-y , Copper Indium Selenide Gallium (CuIn _x Ga _1-x S _y Se _2-y ), copper indium selenide (CuInSe ₂ ), copper indium gallium selenide (CuIn _x Ga _1-x Se ₂ ), and cadmium telluride (CdTe).

4a-4f, a method for fabricating a thin film solar cell according to the preferred embodiment of the present invention includes the following steps:

(a) forming, on the substrate 2 having the oppositely disposed first side portion 21 and the second side portion 22, a plurality of strips arranged from the first side portion 21 to the first side adjacent to the second side portion 22 Electrode layers 311, 321, 331;

(b) forming an absorbing layer 30 covering the first electrode layers 311, 321, 331 on the substrate 2;

(c) cutting the absorbing layer 30 to define the first edges from the first side portion 21 to the second side portion 22 adjacent to the substrate 2 on the first electrode layers 311, 321, 331 An absorbing layer 313, a base absorbing layer 323 and a second edge absorbing layer 333;

(d) forming, on the absorbing layers 313, 323, 333, the second electrode layers 312, 322, 332 which are sequentially spaced from the first side portion 21 adjacent to the substrate 2 to the second side portion 22, The absorption layers 313, 323, 333 of the step (c) are electrically connected in series;

The cutting condition of the step (c) is set such that the average widths of the first and second edge absorbing layers 313, 333 are W _L1 and W _L2 , respectively, and the widths of the basic absorbing layers 323 are equal and the average width is W _S , W _L1 > W _S , W _L2 > W _S .

Preferably, the manufacturing method of the preferred embodiment of the present invention further comprises a step (e) and a step (f) after the step (d). The step (e) is to electrically connect the contacts 4 with the first electrode layer 311 closest to the first side portion 21 and the second electrode layer 332 closest to the second side portion 22; f) mounting the substrate 2 in the frame 5 such that the frame 5 surrounds the first side portion 21 and the second side portion 22 of the substrate 2, and allows sunlight to penetrate the substrate 21 to illuminate the battery unit 3.

The detailed conditions of the manufacturing method of the preferred embodiment of the present invention have been described above, and the description thereof will not be repeated here.

<Specific Example 1 (E1)>

One specific example 1 (E1) of the thin film solar cell module of the present invention is produced according to the following production flow.

First, a plurality of strips having a first side portion and a second side portion oppositely disposed and having a width of 1100 mm are sequentially arranged from the first side portion to the second side portion. An electrode layer.

Further, a first absorption layer made of amorphous germanium (ie, used as a top cell) and a second absorption layer made of microcrystalline germanium are sequentially formed on the first electrode layers (ie, That is, it is used as a bottom battery).

Then, the absorbing layer is cut by laser scribing to define five first lines on the first electrode layer from the first side to the second side of the glass substrate. An edge absorbing layer, 116 base absorbing layers, and 5 second edge absorbing layers.

Subsequently, a plurality of second electrode layers arranged in sequence from the first side portion adjacent to the substrate to the second side portion are formed on the absorbing layer after the laser cutting, and sequentially connected in series 5 first edge absorbing layers, 116 basic absorbing layers, and 5 second edge absorbing layers, and constituting two first edge thin film solar cells and 58 basic thin film solar cells, respectively, and 58 basic layers A thin film solar cell and a battery cell of five second edge thin film solar cells. After the two battery cells are completed, a first and second contacts are electrically connected in series with the first electrode layer closest to the first side portion and the second electrode layer closest to the second side portion, and the two A third contact is formed between the battery cells to electrically connect the two battery cells in parallel.

Finally, the two battery cells are packaged and the glass substrate on which the two packaged battery cells are formed is mounted in an aluminum frame to complete the thin film solar cell module of the 3T structure of the specific example 1 (E1) of the present invention. .

In the specific example 1 (E1) of the present invention, the laser cutting condition is set such that the width of each of the first edge absorbing layers is 8.73 mm, the width of each of the base absorbing layers is 8.39 mm, and each second The width of the edge absorbing layer is 8.73 mm; that is, the W _L1 and W _L2 of the first and second edge absorbing layers are 8.73 mm, and the W _S of the basic absorbing layers is 8.39 mm, W _L1 /W _S and W _L2 /W _S is equal to 1.04, and the sum of the widths of the first and second edge absorbing layers is 43.65 mm, respectively.

<Specific example 2 (E2)>

The specific example 2 (E2) of the thin film solar cell module of the present invention and the method for fabricating the same is substantially the same as the specific example 1 (E1), and the difference is that the specific example 2 (E2) of the present invention The two battery cells respectively have five first edge thin film solar cells with a width of 8.87 mm and 58 basic thin film solar cells with a width of 8.37 mm, and 58 basic thin film solar cells with a width of 8.37 mm and five strips having a width of 8.87 mm. The second edge thin film solar cell; that is, the W _L1 and W _L2 of the first and second edge thin film solar cells are 8.87 mm, and the W _S of the basic thin film solar cells is 8.37 mm, W _L1 /W _S and W _L2 / W _S is equal to 1.06, and the total width of the first and second edge thin film solar cells is 44.35 mm.

<Specific example 3 (E3)>

The specific example 3 (E3) of the thin film solar cell module of the present invention and the manufacturing method thereof is the same as the specific example 1 (E1), and the difference is that the two batteries of the specific example 3 (E3) of the present invention The unit has five first edge thin film solar cells with a width of 9.03 mm and 58 basic thin film solar cells with a width of 8.36 mm, and 58 basic thin film solar cells with a width of 8.36 mm and five widths of 9.03 mm. Two edge thin film solar cells; that is, the W _L1 and W _L2 of the first and second edge thin film solar cells are 9.03 mm, and the W _S of the base thin film solar cells is 8.36 mm, W _L1 /W _S and W _L2 / W _S is equal to 1.08, and the widths of the first and second edge thin film solar cells are respectively 45.15 mm.

<Specific example 4 (E4)>

The specific example 4 (E4) of the thin film solar cell module of the present invention and the manufacturing method thereof are the same as the specific example 1 (E1), and the difference is that the two batteries of the specific example 4 (E4) of the present invention The unit has five first edge thin film solar cells with a width of 9.19 mm and 58 basic thin film solar cells with a width of 8.35 mm, and 58 basic thin film solar cells with a width of 8.35 mm and five widths of 9.19 mm. Two edge thin film solar cells; that is, the W _L1 and W _L2 of the first and second edge thin film solar cells are 9.19 mm, and the W _S of the base thin film solar cells is 8.35 mm, W _L1 /W _S and W _L2 / W _S is equal to 1.10, and the widths of the first and second edge thin film solar cells are respectively 45.95 mm.

<Specific example 5 (E5)>

The specific example 5 (E5) of the thin film solar cell module of the present invention and the manufacturing method thereof is the same as the specific example 1 (E1), and the difference is that the two batteries of the specific example 5 (E5) of the present invention The unit has five first edge thin film solar cells and 58 basic thin film solar cells with a width of 8.39 mm, and 58 basic thin film solar cells with a width of 8.39 mm and five second edge thin film solar cells. In addition, the widths of the five first and second edge thin film solar cells are respectively increased from one of the base thin film solar cells toward the first and second sides of the substrate, and the five first and second edge thin film solar cells In this direction, there are two strips of 8.64 mm width, two strips of 8.89 mm width and one strip of 9.23 mm, that is, the W _L1 and W _L2 of the first and second edge thin film solar cells are 8.86 mm. The W _S of the base thin film solar cells is 8.39 mm, W _L1 /W _S and W _L2 /W _{S are} equal to 1.056, and the widths of the first and second edge thin film solar cells are respectively 44.29 mm.

<Comparative Example (CE)>

The comparative example (CE) of the thin film solar cell module of the present invention and the manufacturing method thereof is the same as the specific example 1 (E1), and the difference is that the two battery cells of the comparative example (CE) of the present invention The first and second edge thin film solar cells are respectively replaced by five basic thin film solar cells, and each of the battery cells has 63 basic thin film solar cells each having a width of 8.4 mm.

<Analysis data>

The thickness of the absorbent layer of this comparative example (CE) of the present invention is normalized and is shown in Fig. 5. As can be seen from Fig. 5, the thickness of the absorption layer of the comparative example (CE) was uniform, and the thickness thereof was normalized to be between 0.93 and 1.0.

The short-circuit current analysis result of this comparative example (CE) of the present invention is normalized and is shown in Fig. 6. Referring to FIG. 6 again, in the comparative example (CE), under the condition that the thickness of the absorbing layer is uniform, the short-circuit current located at the first and second sides adjacent to the substrate is still caused by the lower amount of light entering the short-circuit current. . Therefore, the comparative example (CE) cannot effectively improve the photoelectric conversion efficiency of the entire module, and thus the short-circuit current, the short-circuit current density, and the maximum output power are both limited by the aforementioned disadvantages and cannot be improved.

A uniform thickness of the absorption layer with good coating quality reflects the uniformity of the short-circuit current density. The short-circuit current density distribution of the first absorption layer (ie, the top cell) and the second absorption layer (ie, the bottom cell) of each specific example of the present invention before laser cutting is a quantum from the absorption layer. The integral of efficiency (QE) is simultaneously normalized to be shown in Figure 7. Referring to Fig. 7, it can be seen that the short-circuit current densities after normalization are all close to 1, which shows that the coating layer of the specific examples of the present invention has good coating quality and uniform thickness, so that the short-circuit current density distribution is uniform.

The average short-circuit currents of the specific examples (E1 to E5) and the comparative example (CE) of the present invention are normalized and are shown in Fig. 8. Referring to FIG. 8, the specific examples (E1 to E5) of the present invention are based on the improvement of the width of the first and second edge thin film solar cells, thereby facilitating the lateral direction of photons in the absorption layers of the first and second edge thin film solar cells. Ground transfer causes a superposition of quantum efficiencies and thereby increases its average short circuit current.

The average maximum output power of the specific examples (E1 to E5) and the comparative example (CE) of the present invention is normalized to be shown in Fig. 9. Referring to FIG. 9, the specific examples (E1 to E5) of the present invention increase the average short-circuit current due to the increase in the width of the first and second edge thin film solar cells, thereby increasing the average maximum output power. .

The average series resistance (Rs) of the specific examples (E1 to E5) and the comparative example (CE) of the present invention are normalized and shown in Fig. 10. Referring to FIG. 10, the specific examples (E1 to E5) of the present invention are based on the increase in the width of the first and second edge thin film solar cells, and the normalized average series resistance is also decreased, which is advantageous for increasing the maximum output power. In addition, under the conditions of these specific examples (E3, E5), the normalized average series resistance exhibits an exponential decrease, which is more conducive to increasing the maximum output power of the overall module.

The average shunt resistance (Rsh) of the specific examples (E1 to E5) and the comparative example (CE) of the present invention is normalized and is shown in Fig. 11. Referring to FIG. 11 , in the specific examples (E1 to E5) of the present invention, the average parallel resistance corresponding to each of the first and second edge thin film solar cells is higher than that of the comparative example (CE). Therefore, the leakage current is small and contributes to the maximum output power of the module.

The detailed conditions of the thin film solar cells of the specific examples (E1 to E5) and the comparative example (CE) of the present invention, and the corresponding normalized electrical analysis results thereof, are simply summarized in the following table 1. in.

It can be seen from the numerical values in Table 1. The specific examples of the present invention are not only due to the improvement of the width of the first and second edge thin film solar cells and the thickness of the absorption layer thereof. And so on, it can be improved in the short circuit current, short circuit current density and maximum output power equivalent energy of the whole module; in addition, the open circuit voltage (Voc) and fill factor (FF) of the specific examples of the present invention It also approaches 1 and shows that its electrical characteristics are very stable. Furthermore, according to the design concept of the module pattern of the present invention, not only the width of the basic thin film solar cells is equal, but also the pattern design of the module is simplified; in addition, it does not significantly increase the module area under a limited module area. Sacrifice the total number of thin film solar cells, so the maximum output power of the overall module can still be maintained.

In summary, the thin film solar cell module of the present invention and the manufacturing method thereof can maintain the uniformity of the short circuit current and the short circuit current density of each thin film solar cell to increase the maximum output power of the thin film solar cell module; The width of the base film solar cell makes the limited module area not sacrifice the total number of thin film solar cells, and the pattern design of the overall module is simplified, so that the object of the present invention can be achieved.

The above is only the preferred embodiment and the specific examples of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent change according to the scope of the invention and the description of the invention. And modifications are still within the scope of the invention patent.

2. . . Substrate

twenty one. . . First side

twenty two. . . Second side

3. . . Battery unit

31. . . First edge thin film solar cell

311. . . First electrode layer

312. . . Second electrode layer

313. . . (first edge) absorption layer

32. . . Basic thin film solar cell

321. . . First electrode layer

322. . . Second electrode layer

323. . . (basic) absorption layer

33. . . Second edge thin film solar cell

331. . . First electrode layer

332. . . Second electrode layer

333. . . (second edge) absorption layer

4. . . contact

5. . . frame

W _L1 . . . First edge thin film solar cell width

W _L2 . . . Width of the second edge thin film solar cell

W _S . . . Basic thin film solar cell width

W. . . Width of the substrate

1 is a front elevational view showing a thin film solar cell module disclosed in US 2008/0121264 A1;

2 is a graph of film thickness versus cell position, illustrating the film thickness distribution of the absorber layer of the thin film solar cell module of FIG. 1;

Figure 3 is a bottom plan view showing a preferred embodiment of the thin film solar cell module of the present invention;

4a to 4f are flow diagrams of a component fabrication, illustrating a method of fabricating the preferred embodiment of the present invention;

Figure 5 is a thickness distribution diagram after normalization, illustrating the thickness distribution of the absorption layer of a comparative example (CE) of the thin film solar cell module of the present invention;

Figure 6 is a short-circuit current (Isc) profile after normalization, illustrating the short-circuit current (Isc) distribution of the comparative example (CE);

7 is a short-circuit current density (Jsc) distribution diagram after normalization, illustrating a short-circuit current density distribution of each specific example of the present invention;

Figure 8 is a normalized short-circuit current (Isc) trend diagram illustrating the short-circuit current (Isc) of the specific examples (E1 to E5) and the comparative example (CE) of the present invention;

9 is a normalized maximum output power trend graph after normalization, illustrating the average maximum output power of the specific examples (E1 to E5) and the comparative example (CE) of the present invention;

Figure 10 is a trend diagram of average series resistance (Rs) after normalization, illustrating the average series resistance (Rs) of the specific examples (E1 to E5) and the comparative example (CE) of the present invention;

Figure 11 is a graph of the average parallel resistance (Rsh) trend after normalization, illustrating the average parallel resistance (Rsh) of the specific examples (E1 to E5) and the comparative example (CE) of the present invention.

2. . . Substrate

twenty one. . . First side

twenty two. . . Second side

3. . . Battery unit

31. . . First edge thin film solar cell

32. . . Basic thin film solar cell

33. . . Second edge thin film solar cell

4. . . contact

5. . . frame

W _L1 . . . First edge thin film solar cell width

W _L2 . . . Width of the second edge thin film solar cell

W _S . . . Basic thin film solar cell width

W. . . Width of the substrate

Claims (25)

A thin film solar cell module comprising: a substrate having a first side portion and a second side portion disposed oppositely; and a battery unit disposed on the substrate and from the first side of the substrate to the first The two side portions sequentially have a plurality of first edge thin film solar cells, at least three base thin film solar cells, and a plurality of second edge thin film solar cells spaced apart from each other, wherein the thin film solar cells are substantially parallel to each other, and the like The average widths of the first and second edge thin film solar cells are W _L1 and W _L2 , respectively, and the widths of the basic thin film solar cells are equal and the average width is W _S , W _L1 > W _S , W _L2 > W _S . The thin film solar cell module according to claim 1, wherein 1.03 ≦W _L1 /W _S ≦1.20; 1.03 ≦W _L2 /W _S ≦1.20. The thin film solar cell module according to claim 1, wherein the first edge thin film solar cells have a total width of cm30 cm, and the width of the second edge thin film solar cells is ≦30 cm. The thin film solar cell module of claim 1, wherein the width of the first edge thin film solar cells is increased from the base thin film solar cells toward the first side of the substrate; The width of the second edge thin film solar cell is increased from the direction of the base thin film solar cells toward the second side of the substrate. The thin film solar cell module according to claim 1, wherein the first and second edge thin film solar cells have the same width. The thin film solar cell module according to claim 1, wherein each of the thin film solar cells has an absorption layer, and the thickness of the absorption layer of the thin film solar cells is normalized to be 0.85 to 1.0. between. The thin film solar cell module according to claim 6, wherein the absorption layer of the thin film solar cell is made of a material selected from the group consisting of amorphous germanium and microcrystalline germanium. , copper indium sulfide, copper indium gallium sulfide, copper indium sulphide, copper indium gallium sulphide, copper indium selenide, copper indium gallium selenide and cadmium telluride. The thin film solar cell module according to claim 1, further comprising a frame surrounding the first side portion and the second side portion of the substrate and allowing sunlight to penetrate the substrate to illuminate the battery unit. The thin film solar cell module according to claim 1, wherein the total number of base thin film solar cells of the battery cell increases as the width of the substrate increases; the basic thin film solar cell of the battery cell The total number is between 3 and 180. A method for fabricating a thin film solar cell module, comprising the steps of: (a) forming a plurality of strips from the first side portion sequentially on a substrate having a first side portion and a second side portion disposed oppositely; Arranging to the first electrode layer adjacent to the second side portion; (b) forming an absorbing layer covering the first electrode layers on the substrate; (c) cutting the absorbing layer on the first electrode layers Forming a plurality of first edge absorbing layers, at least three base absorbing layers, and a plurality of second edge absorbing layers from adjacent first to second sides of the substrate; and (d) absorbing the absorption Forming, on the layer, a plurality of second electrode layers arranged from the first side portion adjacent to the substrate to the second side portion; wherein the cutting condition of the step (c) is set to, the first and second The average width of the edge absorbing layer is W _L1 and W _L2 , respectively, and the widths of the basic absorbing layers are equal and the average width is W _S , W _L1 > W _S , W _L2 > W _S . The method for fabricating a thin film solar cell module according to claim 10, wherein 1.03 ≦W _L1 /W _S ≦1.20; 1.03 ≦W _L2 /W _S ≦1.20. The method for fabricating a thin film solar cell module according to claim 10, wherein the width of the first edge absorbing layer is ≦30 cm; the width of the second edge absorbing layer is ≦30 cm. . The method for fabricating a thin film solar cell module according to claim 10, wherein the width of the first edge absorbing layer is increased from the base absorbing layer toward the first side of the substrate; The width of the second edge absorbing layer is increased from the base absorbing layer toward the second side of the substrate. The method for fabricating a thin film solar cell module according to claim 10, wherein the first and second edge absorbing layers have the same width. The method for fabricating a thin film solar cell module according to claim 10, wherein the thickness of the absorption layers in the step (c) is between 0.85 and 1.0 after being uniformized. The method for fabricating a thin film solar cell module according to claim 10, wherein the absorption layer is made of a material selected from the group consisting of amorphous germanium, microcrystalline germanium, Copper indium sulfide, copper indium gallium sulfide, copper indium sulfide selenide, copper indium gallium selenide, copper indium selenide, copper indium gallium selenide and cadmium telluride. The method for fabricating a thin film solar cell module according to claim 10, wherein the total number of the basic absorption layers increases as the width of the substrate increases; the total number of the basic absorption layers is Between 3 and 180. A thin film solar cell module comprising: a substrate having a first side portion and a second side portion disposed oppositely; and a battery unit disposed on the substrate and from the first side of the substrate to the first The two side portions sequentially have 10 or less first edge thin film solar cells, 90 to 180 basic thin film solar cells, and 10 or less second edge thin film solar cells, which are spaced apart from each other, and the thin film solar cells The first and second edge thin film solar cells have substantially the same widths W _L1 and W _L2 , respectively, and the basic thin film solar cells have the same width and an average width W _S , W _L1 > W _S , W _L2 > W _S . The thin film solar cell module according to claim 18, wherein 1.93 ≦W _L1 /W _S ≦1.20; 1.03 ≦W _L2 /W _S ≦1.20. The thin film solar cell module according to claim 18, wherein the width of the first edge thin film solar cells is ≦30 cm, and the width of the second edge thin film solar cells is ≦30 cm. The thin film solar cell module of claim 18, wherein the width of the first edge thin film solar cells is increased from the base thin film solar cells toward the first side of the substrate; The width of the second edge thin film solar cell is increased from the direction of the base thin film solar cells toward the second side of the substrate. The thin film solar cell module according to claim 18, wherein the first and second edge thin film solar cells have the same width. The thin film solar cell module according to claim 18, wherein each of the thin film solar cells has an absorption layer, and the thickness of the absorption layer of the thin film solar cells is normalized to be 0.85 to 1.0. between. The thin film solar cell module according to claim 23, wherein the absorption layer of the thin film solar cell is made of a material selected from the group consisting of amorphous germanium and microcrystalline germanium. , copper indium sulfide, copper indium gallium sulfide, copper indium sulphide, copper indium gallium sulphide, copper indium selenide, copper indium gallium selenide and cadmium telluride. The thin film solar cell module according to claim 18, further comprising a frame surrounding the first side portion and the second side portion of the substrate and allowing sunlight to penetrate the substrate to illuminate the battery unit.