Solar cell light processing device and method

Abstract

The invention provides a solar cell light processing device, and relates to the technical field of solar cells, the solar cell light processing device comprises a light preheating section, the light preheating section is provided with a first light condensation structure, and the first light condensation structure collects light emitted by a heating lamp towards the first light condensation structure; the light injection section is provided with a second light condensation structure, and the second light condensation structure collects light emitted by the light injection lamp towards the second light condensation structure; the auxiliary sintering section comprises a third light condensation structure, the first light condensation structure and the second light condensation structure transmit the collected light to the third light condensation structure through the light transmission structure, and the third light condensation structure focuses the light to the solar cell. The first light gathering structure and the second light gathering structure are used for gathering dissipated light generated by the light preheating section and the light injection section to the auxiliary sintering section, so that enough light intensity is generated in the auxiliary sintering section, and a laser auxiliary sintering device in the prior art is replaced.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a solar cell light processing device and method. Background Art

[0002] In the photovoltaic industry, a light processing device is a device that processes solar cells. For example, a light injection device can passivate the inside of a silicon wafer, which can improve the efficiency of solar cells. For example, a laser-assisted sintering device can improve the ohmic contact of solar cells, thereby improving the conversion efficiency of solar cells.

[0003] However, the light injection device only has the effect of light passivation and cannot improve the ohmic contact of solar cells; the laser-assisted sintering device is expensive and cannot passivate silicon wafers. In order to simultaneously passivate silicon wafers and improve ohmic contact, the two devices need to be used in series, which is expensive and occupies a large area. Summary of the invention

[0004] In a first aspect, the present invention provides a solar cell light processing device, comprising:

[0005] The optical preheating section includes a heating lamp, which preheats the solar cell. The optical preheating section is provided with a first light-concentrating structure, which collects light emitted by the heating lamp toward the first light-concentrating structure.

[0006] A light injection section, comprising a light injection lamp, the light injection lamp injects light into the solar cell, the light injection section is provided with a second light focusing structure, the second light focusing structure collects light emitted by the light injection lamp toward the second light focusing structure;

[0007] Auxiliary sintering section, the auxiliary sintering section includes a circuit module and an optical path module, the circuit module generates high-density carriers on the solar cell, the optical path module includes a third light-focusing structure, the first light-focusing structure and the second light-focusing structure both transmit the collected light to the third light-focusing structure through the light transmission structure, and the third light-focusing structure focuses the light onto the solar cell.

[0008] In an optional embodiment, the optical path module of the auxiliary sintering section further includes a sintering lamp, and the third focusing structure focuses the light of the sintering lamp and the light transmitted by the light transmission structure onto the solar cell.

[0009] In an optional embodiment, the sintering lamp is located above the third light-concentrating structure, and a reflector is further provided above the sintering lamp, and the reflector reflects light emitted upward by the sintering lamp to the third light-concentrating structure.

[0010] In an optional embodiment, the ratio of the light intensity of the light transmitted by the light transmission structure to the third light focusing structure to the light intensity of the light generated by the sintering lamp is 20% to 80%.

[0011] In an optional embodiment, the light intensity at the focus of the third focusing structure is 50,000 to 100,000 W / m 2 , the current generated by the solar cell is 3 to 18A.

[0012] In an optional embodiment, the third light-concentrating structure includes one or at least two groups of light-concentrating lenses, and the third light-concentrating structure focuses the light to form a light ray parallel to the moving direction of the solar cell.

[0013] In an optional embodiment, the heating lamp is located above the solar cell, the first focusing structure is located above the heating lamp, and the first focusing structure collects light emitted upward by the heating lamp; the light injection lamp is located above the solar cell, the second focusing structure is located above the light injection lamp, and the second focusing structure collects light emitted upward by the light injection lamp; the light injection lamp is located above the solar cell, the second focusing structure is located above the light injection lamp, and the second focusing structure collects light emitted upward by the light injection lamp.

[0014] In alternative embodiments, the light transmitting structure comprises an optical fiber or a channel having a smooth inner wall.

[0015] In an optional embodiment, the circuit module includes at least one pair of electrode rollers, and the at least one pair of electrode rollers connects the upper and lower electrodes of the solar cell to form a circuit.

[0016] The solar cell light processing device provided by the present invention utilizes the first focusing structure and the second focusing structure to focus the scattered light generated by the light preheating section and the light injection section to the auxiliary sintering section, thereby generating sufficient light intensity in the auxiliary sintering section, replacing the laser assisted sintering device in the prior art, achieving the auxiliary sintering effect, reducing the footprint of the device, and reducing the cost of the device.

[0017] In a second aspect, the present invention provides a solar cell light processing method, which uses the solar cell light processing device according to any one of the above embodiments to perform light processing on the solar cell, comprising:

[0018] In the optical preheating stage, a heating lamp is used to preheat the solar cell, and a first light-concentrating structure is used to collect light emitted by the heating lamp toward the first light-concentrating structure and transmit it to the light transmission structure;

[0019] In the light injection section, a light injection lamp is used to inject light into the solar cell, and a second light-concentrating structure is used to collect light emitted by the light injection lamp toward the second light-concentrating structure and transmit the light to the light transmission structure;

[0020] In the auxiliary sintering section, a circuit module is used to generate high-density carriers on the solar cell, a light transmission structure is used to transmit light to the third light-concentrating structure, and the third light-concentrating structure is used to focus the light onto the solar cell.

[0021] The solar cell light processing method provided by the present invention utilizes the first focusing structure and the second focusing structure to focus the scattered light generated by the light preheating section and the light injection section to the auxiliary sintering section, thereby generating sufficient light intensity in the auxiliary sintering section, replacing the laser-assisted sintering device in the prior art, achieving the auxiliary sintering effect, reducing the footprint of the device, and reducing the cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a solar cell light processing device provided by an embodiment of the present invention;

[0024] Figure 2 A partial schematic diagram of an auxiliary sintering section in a solar cell light processing device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic structural diagram of a third light-concentrating structure in a solar cell light-processing device provided in an embodiment of the present invention.

[0026] Icons: 100-light preheating section; 110-heating lamp; 120-first focusing structure; 200-light injection section; 210-light injection lamp; 220-second focusing structure; 300-auxiliary sintering section; 310-electrode roller; 321-third focusing structure; 322-sintering lamp; 323-reflector; 330-focusing light; 400-light transmission structure; 500-transmission structure; 600-solar cell. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] The embodiment of the present invention provides a solar cell 600 light processing device, comprising:

[0035] The optical preheating section 100 includes a heating lamp 110, which preheats the solar cell 600. The optical preheating section 100 is provided with a first light-concentrating structure 120, which collects light emitted by the heating lamp 110 toward the first light-concentrating structure 120;

[0036] The light injection section 200 includes a light injection lamp 210, the light injection lamp 210 injects light into the solar cell 600, and the light injection section 200 is provided with a second light focusing structure 220, and the second light focusing structure 220 collects light emitted by the light injection lamp 210 toward the second light focusing structure 220;

[0037] Auxiliary sintering section 300, the auxiliary sintering section 300 includes a circuit module and an optical path module, the circuit module generates high-density carriers on the solar cell 600, the optical path module includes a third light-focusing structure 321, the first light-focusing structure 120 and the second light-focusing structure 220 both transmit the collected light to the third light-focusing structure 321 through the light transmission structure 400, and the third light-focusing structure 321 focuses the light onto the solar cell 600.

[0038] The solar cell 600 light processing device provided in this embodiment utilizes the first focusing structure 120 and the second focusing structure 220 to focus the scattered light generated by the light preheating section 100 and the light injection section 200 to the auxiliary sintering section 300, thereby generating sufficient light intensity in the auxiliary sintering section 300, replacing the laser-assisted sintering device in the prior art, achieving the effect of auxiliary sintering, reducing the footprint of the device, and reducing the cost of the device.

[0039] like Figure 1 As shown, in the solar cell 600 light processing device, the solar cell 600 moves in the solar cell 600 light processing device through the conveying structure 500. Before entering the light preheating section 100, silver paste is printed on the front and back sides of the silicon wafer coated with silicon nitride film, and then dried at a drying temperature of 300-600°C. Only after drying will the solar cell 600 enter the light preheating section 100, at which time the solar cell 600 is in the form of a silicon wafer.

[0040] The light preheating section 100 maintains the temperature at 300-600° C. through the heating lamp 110 to preheat the solar cell 600. The heating lamp 110 may be an infrared lamp.

[0041] After passing through the light preheating section 100, the solar cell 600 enters the light injection section 200. The light injection time of the solar cell in the light injection section 200 can be 10 to 50 seconds. The light injection lamp 210 of the light injection section 200 can use an LED lamp to simulate the solar spectrum. The light intensity generated by the light injection lamp 210 is 5000-20000W / m 2 .

[0042] like Figure 1 and 2 As shown, the circuit module includes a pair of electrode rollers 310, which connect the upper and lower electrodes of the solar cell 600 to form a loop, so that high-density carriers are generated locally in the solar cell 600 to achieve the effect of auxiliary sintering.

[0043] In an optional embodiment, the circuit module may further include multiple pairs of electrode rollers 310. When there are multiple groups or multiple pieces of mutually insulated solar cells 600 at the same time, a pair of electrode rollers 310 connects the upper and lower electrodes of a group or a piece of solar cell 600 to form a loop, so that high-density carriers are locally generated in the solar cell 600, thereby achieving the effect of auxiliary sintering.

[0044] The heating lamps 110 of the optical preheating section 100 and the light injection lamps 210 of the light injection section 200 can both generate surpluses during application, and the utilization rates of the heating lamps 110 and the light injection lamps 210 are relatively low, while the auxiliary sintering section 300 has high requirements on light intensity. The first focusing structure 120 is used to collect the light emitted by the heating lamps 110 toward the part other than the solar cell 600, and the second focusing structure 220 is used to collect the light emitted by the light injection lamps 210 toward the part other than the solar cell 600. The collected light is transmitted to the third focusing structure 321 through the light transmission structure 400. This can not only improve the utilization rates of the heating lamps 110 of the optical preheating section 100 and the light injection lamps 210 of the light injection section 200, but also improve the light intensity of the auxiliary sintering section 300, so that the auxiliary sintering section 300 can abandon the laser-assisted sintering device, thereby reducing the footprint of the device and the cost of the device.

[0045] Embodiment 2 of the present invention provides a method for light processing of a solar cell 600, which uses a light processing device for a solar cell 600 according to any one of the above embodiments to perform light processing on the solar cell 600, comprising:

[0046] In the optical preheating section 100 , the solar cell 600 is preheated by the heating lamp 110 , and the light emitted by the heating lamp 110 toward the first focusing structure 120 is collected by the first focusing structure 120 and transmitted to the optical transmission structure 400 ;

[0047] In the light injection section 200 , the light injection lamp 210 is used to inject light into the solar cell 600 , and the second light focusing structure 220 is used to collect the light emitted by the light injection lamp 210 toward the second light focusing structure 220 and transmit the light transmission structure 400 ;

[0048] In the auxiliary sintering section 300 , a circuit module is used to generate high-density carriers on the solar cell 600 , the light transmission structure 400 is used to transmit light to the third light-concentrating structure 321 , and the third light-concentrating structure 321 is used to focus the light onto the solar cell 600 .

[0049] The light processing method for the solar cell 600 provided by the present invention utilizes the first focusing structure 120 and the second focusing structure 220 to focus the scattered light generated by the light preheating section 100 and the light injection section 200 to the auxiliary sintering section 300, thereby generating sufficient light intensity in the auxiliary sintering section 300, replacing the laser-assisted sintering device in the prior art, achieving the effect of auxiliary sintering, reducing the footprint of the device, and reducing the cost of the device.

[0050] In an optional embodiment, the optical path module of the auxiliary sintering section 300 further includes a sintering lamp 322 , and the third focusing structure 321 focuses the light of the sintering lamp 322 and the light transmitted by the light transmission structure 400 onto the solar cell 600 .

[0051] The sintering lamp 322 can provide more and more direct illumination, so that the third light-concentrating structure 321 can obtain more light, thereby further enhancing the light intensity generated by the third light-concentrating structure 321. In addition, the light generated by the sintering lamp 322 will not be lost through the light transmission structure 400, so the utilization rate is higher and it is easier to generate higher intensity light.

[0052] In an optional embodiment, the sintering lamp 322 is located above the third light-concentrating structure 321 , and a reflector 323 is further provided above the sintering lamp 322 , and the reflector 323 reflects the light emitted upward by the sintering lamp 322 to the third light-concentrating structure 321 .

[0053] The reflector 323 can further improve the utilization rate of the light generated by the sintering lamp 322 and avoid light dissipation in the auxiliary sintering section 300. Improving the utilization rate of the light generated by the sintering lamp 322 can further improve the light intensity that the auxiliary sintering section 300 can generate, and can achieve a better auxiliary sintering effect.

[0054] In an optional embodiment, the ratio of the light intensity of the light transmitted by the light transmission structure 400 to the third light focusing structure 321 to the light intensity of the light generated by the sintering lamp 322 is 20% to 80%.

[0055] The optical preheating section 100 and the optical injection section 200 have a larger space than the auxiliary sintering section 300. Accordingly, the number of lamp tubes of the preheating lamp and the optical injection lamp 210 is also more than the number of sintering lamps 322 of the auxiliary sintering section 300. In some cases, the number of lamp tubes of the preheating lamp and the optical injection lamp 210 can reach 3-10 times the number of sintering lamps 322. At this time, even if the first focusing mechanism and the second focusing mechanism can only collect a part of the light generated by the preheating lamp and the optical injection lamp 210, and the optical transmission mechanism will also have a certain loss, the ratio of the light finally transmitted to the third focusing structure 321 via the optical transmission structure 400 to the light generated by the sintering lamp 322 can still reach 20% to 80%, which can achieve the effect of greatly improving the light intensity that the auxiliary sintering section 300 can generate, thereby achieving a better auxiliary sintering effect.

[0056] In an optional embodiment, the light intensity at the focus of the third light-focusing structure 321 is 50,000 to 100,000 W / m 2 , the current generated by the solar cell 600 is 3 to 18 A. The sintering lamp 322 can be an infrared lamp tube or an LED lamp tube.

[0057] The third light-concentrating structure 321 focuses light onto the solar cell 600. When the light intensity at the focus is 50,000 to 100,000 W / m 2 When combined with the circuit module, the current generated in the solar cell 600 can reach 3 to 18 A, that is, a better auxiliary sintering effect can be achieved.

[0058] In an optional embodiment, the third light-concentrating structure 321 includes one or at least two groups of light-concentrating lenses, and the third light-concentrating structure 321 focuses the light to form a light line moving parallel to the solar cell 600 .

[0059] like Figure 2 and 3 As shown, in the solar cell 600 light processing device, the solar cell 600 is moved in the solar cell 600 light processing device through the conveying structure 500, and the third focusing structure 321 focuses the light to form a light ray parallel to the moving direction of the solar cell 600, so that the solar cell 600 can complete auxiliary sintering during the movement process.

[0060] In an optional embodiment, the width of the focused light 330 may be adjusted by adjusting the distance between the solar cell 600 and the third light focusing structure 321, or by adjusting the focus of the third light focusing structure 321. The narrower the width of the focused light 330, the higher the energy density generated.

[0061] In an optional embodiment, the heating lamp 110 is located above the solar cell 600 , and the first light-concentrating structure 120 is located above the heating lamp 110 . The first light-concentrating structure 120 collects light emitted upward by the heating lamp 110 .

[0062] like Figure 1 As shown, in the solar cell 600 light processing device, the solar cell 600 is moved in the solar cell 600 light processing device through the conveying structure 500, the heating lamp 110 is located above the solar cell 600, and the first focusing structure 120 collects the light emitted upward by the heating lamp 110. The first focusing structure 120 is reasonably arranged and conforms to the conventional structural arrangement of the existing solar energy light processing device. The device structure is highly versatile and more convenient to use.

[0063] In an optional embodiment, the light injection lamp 210 is located above the solar cell 600 , and the second light focusing structure 220 is located above the light injection lamp 210 . The second light focusing structure 220 collects light emitted upward by the light injection lamp 210 .

[0064] like Figure 1 As shown, in the solar cell 600 light processing device, the solar cell 600 is moved in the solar cell 600 light processing device through the transmission structure 500, the light injection lamp 210 is located above the solar cell 600, and the second focusing structure 220 collects the light emitted upward by the light injection lamp 210. The second focusing structure 220 is reasonably set and conforms to the conventional structural setting of the existing solar energy light processing device. The device structure is highly universal and more convenient to use.

[0065] In an optional embodiment, the first light-focusing structure 120 and the second light-focusing structure 220 each include one or at least two groups of lenses.

[0066] For example, the lens can be a quartz lens, the cross section of the lens is a convex lens, and has a certain length, so as to collect the light emitted by the heating lamp 110 and the light injection lamp 210 to the first light-concentrating structure 120 and the second light-concentrating structure 220, and further transmit it to the light transmission structure 400. The material and shape of the lens here are only examples and have no limiting effect. Other structures that can concentrate light can achieve the effects of the first light-concentrating structure 120 and the second light-concentrating structure 220 in the present invention.

[0067] In an alternative embodiment, the light transmission structure 400 includes an optical fiber or a channel with a smooth inner wall.

[0068] The cross-sectional shape of the optical fiber and the channel can be rectangular or circular. The channel with a smooth inner wall can reduce the light transmission loss like the optical fiber and ensure the light intensity of the auxiliary sintering section.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solar cell light processing device, characterized in that: include: The optical preheating section (100) comprises a heating lamp (110), wherein the heating lamp (110) preheats the solar cell (600), and the optical preheating section (100) is provided with a first light-concentrating structure (120), wherein the first light-concentrating structure (120) collects light emitted by the heating lamp (110) toward the first light-concentrating structure (120); A light injection section (200) comprising a light injection lamp (210), wherein the light injection lamp (210) injects light into a solar cell (600), wherein the light injection section (200) is provided with a second light focusing structure (220), and wherein the second light focusing structure (220) collects light emitted by the light injection lamp (210) toward the second light focusing structure (220); An auxiliary sintering section (300), the auxiliary sintering section (300) comprising a circuit module and an optical path module, the circuit module generates high-density carriers on the solar cell (600), the optical path module comprises a third light-concentrating structure (321), the first light-concentrating structure (120) and the second light-concentrating structure (220) both transmit the collected light to the third light-concentrating structure (321) through the light transmission structure (400), and the third light-concentrating structure (321) focuses the light onto the solar cell (600).

2. The solar cell light processing device according to claim 1, characterized in that: The optical path module of the auxiliary sintering section (300) further comprises a sintering lamp (322), and the third light focusing structure (321) focuses the light of the sintering lamp (322) and the light transmitted by the light transmission structure (400) onto the solar cell (600).

3. The solar cell light processing device according to claim 2, characterized in that: The sintering lamp (322) is located above the third light-concentrating structure (321), and a reflector (323) is also provided above the sintering lamp (322). The reflector (323) reflects light emitted upward by the sintering lamp (322) to the third light-concentrating structure (321).

4. The solar cell light processing device according to claim 2, characterized in that: The ratio of the light intensity of the light transmitted by the light transmission structure (400) to the third light focusing structure (321) to the light intensity of the light generated by the sintering lamp (322) is 20% to 80%.

5. The solar cell light processing device according to claim 1, characterized in that: The light intensity at the focus of the third light-focusing structure (321) is 50,000 to 100,000 W / m 2 , the current generated by the solar cell (600) is 3 to 18A.

6. The solar cell light processing device according to claim 1, characterized in that: The third light-concentrating structure (321) comprises one or at least two groups of light-concentrating lenses, and the third light-concentrating structure (321) focuses light to form a light beam parallel to the moving direction of the solar cell (600).

7. The solar cell light processing device according to claim 1, characterized in that: The heating lamp (110) is located above the solar cell (600), and the first light-concentrating structure (120) is located above the heating lamp (110), and the first light-concentrating structure (120) collects light emitted upward by the heating lamp (110); the light injection lamp (210) is located above the solar cell (600), and the second light-concentrating structure (220) is located above the light injection lamp (210), and the second light-concentrating structure (220) collects light emitted upward by the light injection lamp (210).

8. The solar cell light processing device according to claim 1, characterized in that: The optical transmission structure (400) comprises an optical fiber or a channel with a smooth inner wall.

9. The solar cell light processing device according to claim 1, characterized in that: The circuit module comprises at least one pair of electrode rollers (310), and the at least one pair of electrode rollers (310) connects the upper and lower electrodes of the solar cell (600) to form a circuit.

10. A method for light processing of a solar cell (600), characterized in that: The solar cell (600) is subjected to light treatment using the solar cell (600) light treatment device according to any one of claims 1 to 9, comprising: In the optical preheating section (100), a heating lamp (110) is used to preheat the solar cell (600), and a first light-concentrating structure (120) is used to collect light emitted by the heating lamp (110) toward the first light-concentrating structure (120) and transmit the light to the light transmission structure (400); In the light injection section (200), a light injection lamp (210) is used to inject light into the solar cell (600), and a second light focusing structure (220) is used to collect light emitted by the light injection lamp (210) toward the second light focusing structure (220) and transmit the light to the light transmission structure (400); In the auxiliary sintering section (300), a circuit module is used to generate high-density carriers on the solar cell (600), a light transmission structure (400) is used to transmit light to the third light-concentrating structure (321), and the third light-concentrating structure (321) is used to focus the light onto the solar cell (600).

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