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CN-122003077-A - Preparation method of laminated solar cell and laminated solar cell

CN122003077ACN 122003077 ACN122003077 ACN 122003077ACN-122003077-A

Abstract

The application provides a preparation method of a laminated solar cell and the laminated solar cell, wherein the preparation method of the laminated solar cell comprises the steps of respectively manufacturing a plurality of top cells and a plurality of bottom cells; and stacking and electrically connecting the top cell and the bottom cell with the difference value of the short-circuit current density within a preset range to form a laminated solar cell. The preparation method of the laminated solar cell can enable the current density of the top cell and the current density of the bottom cell to be more matched, the comprehensive electrical performance of the laminated cell is maximized, and the photoelectric conversion efficiency of the laminated cell is greatly improved.

Inventors

  • ZHANG SONG
  • LI TAO
  • YAN TINGTING
  • LU HONGYAN
  • ZHU FAN

Assignees

  • 帝尔激光科技(无锡)有限公司

Dates

Publication Date
20260508
Application Date
20260131

Claims (14)

  1. 1. A method of manufacturing a stacked solar cell, comprising: s100, respectively manufacturing a plurality of top batteries and a plurality of bottom batteries; S200, respectively performing electrical property tests on the top battery and the bottom battery, wherein the electrical property tests at least comprise short-circuit current; and S300, stacking and electrically connecting the top cell and the bottom cell with the difference value of the short-circuit current density within a preset range to form a plurality of stacked solar cells, wherein the short-circuit current density=short-circuit current/area.
  2. 2. The method according to claim 1, wherein in the step S100, the forbidden bandwidth of the top cell is matched to the forbidden bandwidth of the bottom cell.
  3. 3. The method according to claim 2, wherein the top cell is a perovskite cell and the bottom cell is a crystalline silicon cell, and wherein the step S100 comprises: And adjusting the components of the perovskite layer of the perovskite battery to enable the forbidden bandwidth to be 1.6 eV-1.9 eV.
  4. 4. The method of manufacturing a stacked solar cell according to claim 1, wherein the step S200 comprises: When the electrical performance test is carried out on the top battery, the standard solar light intensity under the AM1.5G solar spectrum is adopted, and when the electrical performance test is carried out on the bottom battery, the spectrum wavelength range adopted is (653nm-775 nm) to 1200nm.
  5. 5. The method for manufacturing a stacked solar cell according to claim 1, wherein the predetermined range is 0-0.1 ma/cm 2 .
  6. 6. The method for manufacturing a stacked solar cell according to claim 1, wherein the step 300 comprises: And respectively taking the preset current difference values of the top cells and the bottom cells as step gradients, dividing the top cells and the bottom cells with the same steps into a plurality of steps according to the short-circuit current from high to low, stacking the top cells and the bottom cells with the same steps, and electrically connecting the top cells and the bottom cells, wherein the short-circuit current density difference value between the top cells and the bottom cells in each stacked solar cell is within the preset range.
  7. 7. The method according to claim 1, wherein the electrical property test further comprises photoelectric conversion efficiency, and the step S300 comprises: firstly, respectively taking respective preset current difference values as step gradients for a plurality of top batteries and a plurality of bottom batteries, dividing the top batteries and the bottom batteries into a plurality of steps from high to low according to short-circuit current, and taking the top batteries and the bottom batteries with the same steps as a group of matching units; And respectively taking respective preset efficiency difference values as step gradients for a plurality of top cells and a plurality of bottom cells in the same group of matching units, dividing into a plurality of steps again according to the high-low division of photoelectric conversion efficiency, stacking the top cells and the bottom cells with the same steps, wherein the short-circuit current density difference value between the top cells and the bottom cells in each stacked solar cell is within the preset range.
  8. 8. The method of manufacturing a stacked solar cell according to claim 1, further comprising at least one of EL detection, PL detection, AOI detection between the step S100 and the step S200.
  9. 9. The method for manufacturing a stacked solar cell according to claim 1, wherein the top cell comprises an intermediate transition layer, the intermediate transition layer is used as a bottom layer when the top cell is manufactured, the intermediate transition layer is made of a transparent insulating material and is provided with a plurality of through holes, conductive materials are filled in the through holes, and the top cell and the bottom cell are electrically connected through the conductive materials.
  10. 10. The method according to claim 9, wherein the conductive material comprises a transparent conductive oxide material or a metal material, and the transparent insulating material comprises any one of glass, sapphire, transparent ceramic, PI, POE, PET.
  11. 11. The method of claim 9, wherein the intermediate transition layer has a thickness of 10-500 μm and a light transmittance of >90%.
  12. 12. The method of claim 9, wherein if the top electrode of the bottom cell is a metal electrode, the orthographic projection of the through hole on the bottom cell is at least partially overlapped with the metal electrode region.
  13. 13. The method according to claim 9, wherein if the functional layer material in the top cell that is in contact with the intermediate transition layer is a transparent conductive oxide and the conductive material is also a transparent conductive oxide material, the functional layer is prepared while filling the through-holes.
  14. 14. A laminated solar cell, characterized in that the laminated solar cell is prepared by the preparation method of any one of claims 1-13.

Description

Preparation method of laminated solar cell and laminated solar cell Technical Field The application belongs to the technical field of solar cell processing, and particularly relates to a preparation method of a laminated solar cell and the laminated solar cell. Background Along with the continuous progress of the crystalline silicon solar cell technology, the photoelectric conversion efficiency of the crystalline silicon solar cell gradually approaches to the theoretical limit, and the laminated solar cell has the potential of breaking through the efficiency bottleneck of the single-junction cell, so that the photovoltaic solar cell becomes an important research direction of the photovoltaic industry. Currently, the main current stacked structure mainly adopts a connection mode of Two-terminal (2T) and four-terminal (Four-terminal, 4T) to connect the bottom battery and the top battery in series and parallel, so as to realize electrical integration. In the 2T structure, the top and bottom cells are connected in series, and if the currents of the top and bottom cells are not well matched, the overall output current is limited to a smaller value, and the overall photoelectric conversion efficiency of the stacked cell is remarkably reduced. In contrast, although the working states of the top battery and the bottom battery can be independently regulated and controlled by the 4T structure, current matching limitation is avoided, two groups of independent electrodes are required to be led out from components of the 4T structure, and at least two paths of converging systems are required to respectively process the generated electricity quantity of the top battery and the generated electricity quantity of the bottom battery in the photovoltaic power station system layer, so that the wiring complexity and the operation and maintenance cost of the power station are greatly increased, and the large-scale commercial application is not facilitated. Therefore, development of a preparation method of a laminated solar cell and the laminated solar cell are needed, so that the advantage of serial-parallel compatibility of 2T structure component ends can be maintained, strict dependence of top and bottom cells on current matching can be effectively relieved, and photoelectric conversion efficiency potential of the laminated cell can be fully exerted. Disclosure of Invention In view of the above, the application provides a method for manufacturing a laminated solar cell and a laminated solar cell. The application provides a preparation method of a laminated solar cell, which is characterized by comprising the following steps: s100, respectively manufacturing a plurality of top batteries and a plurality of bottom batteries; S200, respectively performing electrical property tests on the top battery and the bottom battery, wherein the electrical property tests at least comprise short-circuit current; and S300, stacking and electrically connecting the top cell and the bottom cell with the difference value of the short-circuit current density within a preset range to form a plurality of stacked solar cells, wherein the short-circuit current density=short-circuit current/area. As a further example, in the step S100, the forbidden bandwidth of the top cell is matched with the forbidden bandwidth of the bottom cell. As a further example, the top cell is a perovskite cell and the bottom cell is a crystalline silicon cell, and the step S100 includes: And adjusting the components of the perovskite layer of the perovskite battery to enable the forbidden bandwidth to be 1.6 eV-1.9 eV. As a further example, the step S200 includes: When the electrical performance test is carried out on the top battery, the standard solar light intensity under the AM1.5G solar spectrum is adopted, and when the electrical performance test is carried out on the bottom battery, the spectrum wavelength range adopted is (653nm-775 nm) to 1200nm. As a further example, the preset range is 0-0.1 mA/cm 2. As a further example, the step 300 includes: And respectively taking the preset current difference values of the top cells and the bottom cells as step gradients, dividing the top cells and the bottom cells with the same steps into a plurality of steps according to the short-circuit current from high to low, stacking the top cells and the bottom cells with the same steps, and electrically connecting the top cells and the bottom cells, wherein the short-circuit current density difference value between the top cells and the bottom cells in each stacked solar cell is within the preset range. As a further example, the electrical performance test further includes photoelectric conversion efficiency, and the step S300 includes: firstly, respectively taking respective preset current difference values as step gradients for a plurality of top batteries and a plurality of bottom batteries, dividing the top batteries and the bottom batteries into a plurality of steps from high t