TW201500678A - Solar simulator and spectrum adjusting method - Google Patents

Abstract

A solar simulator includes a light source, a light uniforming member and N light filters. The light source is used for generating a first light. The light uniforming member is disposed on a path of the first light and used for uniforming the first light. The N light filters are disposed on the path of the first light and M of the N light filters are located between the light source and the light uniforming member. The first light passes through at least partial area of each of the M light filters and the light uniforming member, so as to generate a second light. The at least partial area of each of the M light filters, which allows the first light to pass through, is capable of being changed, so as to adjust a ratio of a spectrum of the second light to a spectrum of sunlight.

Description

Solar simulator and spectral adjustment method

The invention relates to a solar simulator and a spectrum adjustment method, in particular to a solar simulator and a spectrum adjustment method capable of effectively shortening the distance between the light source and the illumination plane and adjusting the spectrum of the light emitted by the light source to approximate the spectrum of sunlight. .

With the sharp increase in energy demand, energy-saving solar cell applications have gradually attracted people's attention, which has led to the development of many types of solar cell technology, including silicon based solar cells and germanium films. Silicon thin film solar cell, dye sensitized solar cell, copper indium selenide solar cell (CuInGaSe solar cell), concentrator type III-V compound solar cell (concentrator III-V compound solar) Cell) and so on. To evaluate the characteristics of these solar cells depends on the measurement technology of the trust to provide reliable solar cell conversion efficiency values.

At present, a solar simulator is mainly used to provide a light source that approximates the spectrum of sunlight to measure the characteristics of the solar cell. Since the power output of solar cells is inseparable from the spectrum of sunlight, the advantages and disadvantages of solar simulators will greatly affect the measurement results of solar cells. In addition, according to the application of the solar cell, the spectrum of the sunlight can be used as the measurement standard of AM1.5G or AM1.5D. In the prior art, a number of techniques have been developed for solar simulators, such as U.S. Patent No. 6,590,149, which discloses that the distance between the source and the illumination plane is metric (see the '149 patent specification column 3). Lines 57 to 67). Since the distance between the light source and the illumination plane is too large, the light emitted by the light source is easily diverge after passing through the filter, so that the illuminance is lowered, thereby affecting the measurement result of the solar cell.

The invention provides a solar simulator and a spectrum adjustment method, which can effectively shorten the distance between the light source and the illumination plane, and adjust the spectrum of the light emitted by the light source to approximate the spectrum of the sunlight to solve the above problem.

According to an embodiment, the solar simulator of the present invention comprises a light source, a light homogenizing element, and N filters, wherein N is a positive integer greater than one. The light source is used to generate a first light. The light homogenizing element is disposed on a path of travel of the first light to homogenize the first light. The N filters are disposed on the path of the first light, and the M filters of the N filters are located between the light source and the light homogenizing element, wherein M is a positive integer less than or equal to N. The first light generates a second light through at least a portion of the area of each of the M filters and the light homogenizing element. At least a portion of the area of each M filter that allows the first light to pass may be varied to adjust the ratio of the spectrum of the second light to the spectrum of a sunlight.

In this embodiment, the solar simulator may further include an illumination plane, wherein the distance from the light source to the illumination plane is less than 1 meter. Preferably, the distance from the source to the illumination plane is less than 0.5 meters.

In this embodiment, the solar simulator may further include a reflector disposed between the light source and the illumination plane, and the light homogenizing element and the N filters are disposed in the reflector.

According to another embodiment, the spectral adjustment method of the present invention comprises the steps of: generating a first light by a light source, wherein a light homogenizing element and N filters are disposed on one of the first rays, N filters The M filters in the light sheet are located between the light source and the light homogenizing element, N is a positive integer greater than 1, and M is a positive integer less than or equal to N; the first light passes through each M filter At least a portion of the area of the sheet and the light homogenizing element to produce a second light; and changing at least a portion of the area of each of the M filters that allow the first light to pass to adjust the spectrum of the second light to a spectrum of sunlight proportion.

In this embodiment, the spectral adjustment method further comprises the steps of: making the distance of the light source to an illumination plane less than 1 meter. Preferably, the distance from the source to the illumination plane can be less than 0.5 meters.

In this embodiment, the spectral adjustment method further comprises the following steps: the light source and the illumination are flat A reflector is disposed between the faces, and the light homogenizing element and the N filters are disposed in the reflector.

In summary, the present invention enables the light emitted by the light source of the solar simulator to pass through at least a portion of the area of the filter between the light source and the light homogenizing element, and by changing at least the filter that allows the light to pass therethrough. Part of the area, in order to adjust the ratio of the spectrum of the light emitted by the light source to the spectrum of the sunlight, and then adjust the spectrum of the light emitted by the light source to approximate the spectrum of sunlight. In other words, by changing at least a portion of the area of the filter that allows light to pass through, the spectrum of the light emitted by the source can be quickly adjusted to approximate the spectrum of sunlight, thereby reducing the time course of detecting the solar cell/module. In addition, the present invention utilizes a light homogenizing element to homogenize the light emitted by the light source, and a reflective cover may be disposed between the light source and the illumination plane such that the distance from the light source to the illumination plane is less than 1 meter (preferably, may be less than 0.5). The meter emits light that does not diverge after passing through the filter and the light homogenizing element, thereby increasing the illumination, thereby ensuring the measurement result of the solar cell/module.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

1, 2, 3, 4, 5‧‧‧Sunlight Simulator

10‧‧‧Light source

12‧‧‧Light homogenizing components

14a, 14b, 14c‧‧‧ filters

16‧‧‧ illumination plane

18‧‧‧reflector

120‧‧ ‧ integral column

122‧‧‧Diffuser

A1, A2‧‧‧ arrows

D‧‧‧Distance

L1‧‧‧First light

L2‧‧‧second light

P‧‧‧Road route

S1‧‧‧ first side

S2‧‧‧ second side

Figure 1 is a schematic illustration of a solar simulator in accordance with an embodiment of the present invention.

2 is a schematic view of a solar simulator according to another embodiment of the present invention.

Figure 3 is a schematic illustration of a solar simulator in accordance with another embodiment of the present invention.

Figure 4 is a schematic illustration of a solar simulator in accordance with another embodiment of the present invention.

Figure 5 is a schematic illustration of a solar simulator in accordance with another embodiment of the present invention.

Figure 6 is a flow chart of a method of spectral adjustment in accordance with an embodiment of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a solar simulator 1 according to an embodiment of the present invention. As shown in Fig. 1, the solar simulator 1 comprises a light source 10, a light homogenizing element 12, N filters 14a, 14b and an illumination plane 16, wherein N is a positive integer greater than one. In this embodiment, the illumination plane 16 can be a solar cell/module. In other words, the present invention is too The Sunlight Simulator 1 is a light source for providing a spectrum of approximate sunlight to measure the characteristics of the solar cell/module. In this embodiment, the light source 10 can be a gas discharge lamp, a xenon lamp, a light emitting diode (LED) lamp, a halogen lamp, an artificial light source, or the like. In this embodiment, the filters 14a, 14b that can filter out short-wavelength or long-wavelength light can be selected according to actual needs.

The light source 10 is used to generate a first light L1. The light homogenizing element 12 is disposed on one of the traveling paths P of the first light L1 for homogenizing the first light L1. The filters 14a, 14b are also disposed on the travel path P of the first light L1, and the M filters of the filters 14a, 14b are located between the light source 10 and the light homogenizing element 12, wherein M is a smaller Or a positive integer equal to N. In this embodiment, N=2 and M=N=2. Further, the filters 14a, 14b are arranged side by side and movably on one of the first sides S1 of the light homogenizing element 12. In this embodiment, the light homogenizing element 12 can include an integrating column 120 and a diffusion sheet 122, wherein the diffusion sheet 122 is disposed between the filters 14a, 14b and the integrating column 120. By combining the integrating column 120 and the diffusion sheet 122, the light homogenizing element 12 can diffuse and mix the first light L1 generated by the light source 10. It should be noted that the light homogenizing element 12 can also be a single integrating column 120, and does not include the diffusing plate 122, depending on the actual application.

In this embodiment, the first light L1 generated by the light source 10 generates a second light L2 along the travel path P through at least a portion of the area of each of the filters 14a, 14b and the light homogenizing element 12, and allows the first light At least a portion of the area of each of the filters 14a, 14b through which the light L1 passes may be varied to adjust the ratio of the spectrum of the second light L2 to the spectrum of a sunlight. In this embodiment, the filters 14a, 14b are movable relative to the light homogenizing element 12 in the direction perpendicular to the travel path P of the first light ray L1 (as indicated by the directions of the arrows A1, A2 in FIG. 1) to change At least a portion of the area of each of the filters 14a, 14b through which the first light ray L1 is allowed to pass. Furthermore, the area of each of the filters 14a, 14b may be greater than or equal to the cross-sectional area of the light homogenizing element 12 on the travel path P of the first light L1, depending on the application. For example, when the filters 14a, 14b are moved in the direction of the arrow A1 with respect to the light homogenizing element 12, the area of the filter 14a allowing the passage of the first light L1 is increased, and the first light L1 is allowed to pass. The area of the filter 14b is reduced; when the filter 14a, When the 14b relative light homogenizing element 12 is moved in the direction of the arrow A2, the area of the filter 14a allowing the first light ray L1 to pass is reduced, and the area of the filter 14b allowing the first light ray L1 to pass is increased.

Referring to Table 1 below, Table 1 shows that at least part of the area of each of the filters 14a, 14b that allows the first light ray L1 to pass is at a different percentage, in the wavelength range of 350-670 nm and 670-880 nm. The ratio of the measured spectrum of the second light L2 to the spectrum of the sunlight.

Therefore, by changing at least part of the area of the filters 14a, 14b allowing the first light L1 to pass, the ratio of the spectrum of the second light L2 to the spectrum of the sunlight can be adjusted, thereby adjusting the spectrum of the second light L2 to Approximate the spectrum of sunlight. In other words, as long as the change allows the first light The at least partial area of the filters 14a, 14b through which L1 passes can quickly adjust the spectrum of the second light L2 to approximate the spectrum of sunlight, thereby reducing the time course of detecting the solar cell/module. In addition, the present invention utilizes the light homogenizing element 12 to homogenize the first light L1 emitted by the light source 10, so that the distance D of the light source 10 to the illumination plane 16 can be less than 1 meter (preferably, less than 0.5 meters), The first light L1 emitted by the light source 10 does not diverge after passing through the filters 14a, 14b and the light homogenizing element 12, so that the illuminance is improved, thereby ensuring the measurement result of the solar cell/module. Furthermore, the present invention allows the first light ray L1 to pass completely through the light homogenizing element 12 to enhance illuminance uniformity.

Please refer to FIG. 2, which is a schematic diagram of a solar simulator 2 according to another embodiment of the present invention. The main difference between the solar simulator 2 and the solar simulator 1 described above is that the M filters 14a of the N filters 14a, 14b of the solar simulator 2 are movably arranged for light homogenization. The first side S1 of the component 12, and the other NM filters 14b are disposed on the second side S2 of the light homogenizing element 12, wherein the first side S1 is opposite the second side S2. In this embodiment, N=2 and M=1. In other words, in the solar simulator 2, only the filter 14a located between the light source 10 and the light homogenizing element 12 can move relative to the light homogenizing element 12 in the direction perpendicular to the traveling path P of the first light L1 (eg, 2, the direction of the arrows A1, A2 are shown) to change at least a portion of the area of the filter 14a that allows the first light ray L1 to pass. The first light ray L1 that has not passed through the filter 14a passes directly through the light homogenizing element 12. In addition, the filter 14b may be fixed to the second side S2 of the light homogenizing element 12 or movably disposed on the second side S2 of the light homogenizing element 12 to increase the flexibility of spectral adjustment.

Please refer to Table 2 below. Table 2 shows the measurement of the at least part of the area of the filter 14a that allows the first light L1 to pass through at different percentages in the wavelength range of 350-670 nm and 670-880 nm. The ratio of the spectrum of the two rays L2 to the spectrum of the sunlight.

Therefore, by changing at least part of the area of the filter 14a that allows the first light L1 to pass, the ratio of the spectrum of the second light L2 to the spectrum of the sunlight can be adjusted, thereby adjusting the spectrum of the second light L2 to approximate the sun. The spectrum of light. In other words, as long as at least a part of the area of the filter 14a allowing the first light L1 to pass is changed, the spectrum of the second light L2 can be quickly adjusted to approximate the spectrum of the sunlight, thereby reducing the time history of detecting the solar cell/module. . In addition, the present invention utilizes the light homogenizing element 12 to homogenize the first light L1 emitted by the light source 10, so that the distance D of the light source 10 to the illumination plane 16 can be less than 1 meter (preferably, less than 0.5 meters), The first light L1 emitted by the light source 10 does not diverge after passing through the filter 14a and the light homogenizing element 12, so that the illuminance is improved, thereby ensuring the measurement result of the solar cell/module. Furthermore, the present invention allows the first light ray L1 to pass completely through the light homogenizing element 12 to enhance illuminance uniformity.

Please refer to FIG. 3, which is a schematic diagram of a solar simulator 3 according to another embodiment of the present invention. The main difference between the solar simulator 3 and the solar simulator 1 described above is that the solar simulator 3 comprises three filters 14a, 14b, 14c, wherein the two filters 14a, 14b are side by side and movable. Is disposed on the first side S1 of the light homogenizing element 12, and a filter 14c is disposed on the second side S2 of the light homogenizing element 12, wherein the filter 14c can be fixed to the light homogenizing element The second side S2 of 12 is either movably disposed on the second side S2 of the light homogenizing element 12 to increase the flexibility of spectral adjustment. Furthermore, the area of each of the filters 14a, 14b, 14c may be greater than or equal to the cross-sectional area of the light homogenizing element 12 on the path P of the first light L1, depending on the application. The principle of operation of the movable filters 14a, 14b is as described above and will not be described herein. In other words, the present invention can utilize three or more filters to adjust the spectrum of the second light ray L2 to approximate the spectrum of sunlight. It should be noted that the components of the same reference numerals as those shown in FIG. 1 are substantially the same, and will not be described again.

Please refer to FIG. 4, which is a schematic diagram of a solar simulator 4 according to another embodiment of the present invention. The main difference between the solar simulator 4 and the solar simulator 3 described above is that the two movable filters 14a, 14b of the solar simulator 4 are staggered up and down. The principle of operation of the movable filters 14a, 14b is as described above and will not be described herein. In other words, the movable filters 14a, 14b of the present invention can be aligned side by side or up and down to adjust the spectrum of the second light L2 to approximate the spectrum of sunlight. It should be noted that the components of the same reference numerals as those shown in FIG. 4 have substantially the same operation principle, and are not described herein again.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of a solar simulator 5 according to another embodiment of the present invention. The main difference between the solar simulator 5 and the solar simulator 1 described above is that the solar simulator 5 further includes a reflector 18. The reflector 18 is disposed between the light source 10 and the illumination plane 16, and the light source 10 and the filters 14a, 14b are disposed in the reflector 18. The present invention can utilize the reflector 18 to confine the light between the source 10 and the illumination plane 16 such that the first light L1 emitted by the source 10 and the second light L2 generated by the filters 14a, 14b and the light homogenizing element 12 It will not diverge and the illumination will be increased, thus ensuring the measurement results of the solar cells/modules.

Please refer to FIG. 6. FIG. 6 is a flow chart of a method for adjusting a spectrum according to an embodiment of the present invention. The spectral adjustment method in Fig. 6 can be realized by the solar simulators 1, 2, 3, 4, 5 in Figs. 1 to 5. First, step S10 is performed to generate the first light ray L1 with the light source 10. Next, in step S12, the first light L1 passes through at least a portion of the area of the filter 14a or 14a, 14b and the light homogenizing element 12 to generate the second light L2. Finally, step S14 is performed to change the permission. At least a portion of the area of the filter 14a or 14a, 14b through which the first light L1 passes adjusts the ratio of the spectrum of the second light L2 to the spectrum of the sunlight. It should be noted that the detailed working principle and operation steps are as described above, and are not described herein again.

In a multi-junction solar cell, the top layer and the bottom layer are electrically connected in series, and the sensitivity of the top layer and the bottom layer are different. The top layer is more sensitive to short wavelengths, and the bottom layer is more sensitive to long wavelengths. When the long wavelength of the spectrum is stronger, the bottom layer generates more charge. Because the top layer and the bottom layer are electrically connected in series, the top and bottom layers will be subjected to the top layer. The impact of power generation. Therefore, the multi-junction solar cell has a characteristic that changes in the amount of power generation of the spectrum. The present invention can adjust the intensity of the long wavelength and the short wavelength in the spectrum by changing at least part of the area of the filter that allows light to pass, thereby aligning the power generation of the top layer and the bottom layer of the multi-junction solar cell. Thereby, the present invention can accurately measure multi-junction solar cells, especially three-five-group multi-junction solar cells.

In summary, the present invention enables the light emitted by the light source of the solar simulator to pass through at least a portion of the area of the filter between the light source and the light homogenizing element, and by changing at least the filter that allows the light to pass therethrough. Part of the area, in order to adjust the ratio of the spectrum of the light emitted by the light source to the spectrum of the sunlight, and then adjust the spectrum of the light emitted by the light source to approximate the spectrum of sunlight. In other words, by changing at least a portion of the area of the filter that allows light to pass through, the spectrum of the light emitted by the source can be quickly adjusted to approximate the spectrum of sunlight, thereby reducing the time course of detecting the solar cell/module. In addition, the present invention utilizes a light homogenizing element to homogenize the light emitted by the light source, and a reflective cover may be disposed between the light source and the illumination plane such that the distance from the light source to the illumination plane is less than 1 meter (preferably, may be less than 0.5). The meter emits light that does not diverge after passing through the filter and the light homogenizing element, thereby increasing the illumination, thereby ensuring the measurement result of the solar cell/module.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

1‧‧‧Sunlight Simulator

10‧‧‧Light source

12‧‧‧Light homogenizing components

14a, 14b‧‧‧ Filters

16‧‧‧ illumination plane

120‧‧ ‧ integral column

122‧‧‧Diffuser

A1, A2‧‧‧ arrows

D‧‧‧Distance

L1‧‧‧First light

L2‧‧‧second light

P‧‧‧Road route

S1‧‧‧ first side

Claims (14)

A solar simulator includes: a light source for generating a first light; a light homogenizing element disposed on a path of the first light to homogenize the first light; and N filters a light sheet disposed on the traveling path of the first light, wherein the M filters of the N filters are located between the light source and the light homogenizing element, and N is a positive integer greater than 1, M a positive integer less than or equal to N; wherein the first light passes through at least a portion of each of the M filters and the light homogenizing element to generate a second light, allowing each of the first rays to pass At least a portion of the area of the M filters can be varied to adjust the ratio of the spectrum of the second light to the spectrum of a sunlight. The solar simulator of claim 1, wherein the M filters are movable relative to the light homogenizing element in a direction perpendicular to the travel path of the first light to change each of the first rays allowed to pass At least a portion of the area of the M filters. The solar simulator of claim 1, wherein the M filters are side by side. The solar simulator of claim 1, wherein the M filters are staggered up and down. The solar simulator of claim 1, wherein the M filters are movably disposed on a first side of the light homogenizing element, and the other NM filters are disposed in one of the light homogenizing elements The second side is opposite the second side. The solar simulator of claim 1, wherein the light homogenizing element comprises an integrating column. The solar simulator of claim 6, wherein the light homogenizing element further comprises a diffusion sheet disposed between the M filters and the integrating column. A method for spectral adjustment, comprising: generating a first light by a light source, wherein a light homogenizing element and N filter settings On one of the first light paths, M of the N filters are located between the light source and the light homogenizing element, N is a positive integer greater than 1, and M is one less than or equal to a positive integer of N; the first light generates a second light through at least a portion of the area of each of the M filters and the light homogenizing element; and changes each of the M filters that allow the first light to pass At least a portion of the area of the light sheet to adjust the ratio of the spectrum of the second light to the spectrum of a sunlight. The spectral adjustment method of claim 8, further comprising: moving the M filters relative to the light homogenizing element in a direction perpendicular to the traveling path of the first light to change each of the first rays allowed to pass At least a portion of the area of the M filters. The spectral adjustment method of claim 8, wherein the M filters are side by side. The spectral adjustment method of claim 8, wherein the M filters are staggered up and down. The spectral adjustment method of claim 8, wherein the M filters are movably disposed on a first side of the light homogenizing element, and the other NM filters are disposed in one of the light homogenizing elements. On both sides, the first side is opposite to the second side. The spectral adjustment method of claim 8, wherein the light homogenizing element comprises an integrating column. The spectral adjustment method of claim 13, wherein the light homogenizing element further comprises a diffusion sheet disposed between the M filters and the integrating column.