Search

KR-102964118-B1 - SOLAR CELL AND METHOD OF FORMING THE SAME

KR102964118B1KR 102964118 B1KR102964118 B1KR 102964118B1KR-102964118-B1

Abstract

A solar cell and a method for forming the same are provided. The solar cell comprises a substrate; and a plurality of unit cells each comprising a first electrode, an active layer, and a second electrode, wherein the unit cells are spaced apart from each other so that the substrate is exposed. The solar cell and the method for forming the same according to the present invention have the effect of minimizing leakage current and increasing the power generation efficiency of the photovoltaic device by having an insulating structure or non-generation region in which the unit cells are spaced apart from each other so that the substrate is exposed.

Inventors

  • 이동현
  • 류국현

Assignees

  • 주식회사 동진쎄미켐

Dates

Publication Date
20260513
Application Date
20211230

Claims (17)

  1. Substrate; A plurality of unit cells including a first electrode, an active layer, and a second electrode; It includes connecting electrodes connecting each unit cell, and The plurality of unit cells have an insulating structure in which they are spaced apart from each other at a distance of 0.1 mm to 2 mm so that the substrate is exposed, and The above connecting electrode is, It is not disposed within the above insulating structure, but extends from the second electrode and is connected to the first electrode of an adjacent unit cell, and The second electrode and the connecting electrode are formed as an integrated structure, A solar cell having a fill factor of 60% or more for low light applications of 100 to 10,000 lux.
  2. delete
  3. In paragraph 1, A solar cell in which at least one of the first electrode and the second electrode is a transparent electrode.
  4. delete
  5. delete
  6. delete
  7. In paragraph 1, A solar cell in which the second electrode and the connecting electrode are made of the same material.
  8. delete
  9. In paragraph 1, A solar cell wherein the first electrode and the second electrode are independently one or more of indium tin oxide (ITO), fluorine tin oxide (FTO), antimony tin oxide (ATO), zinc oxide, tin oxide, ZnoGa₂O₃ , ZnO- Al₂O₃ , platinum, ruthenium, palladium , iridium, rhodium (Rh), osmium (Os), carbon (C), WO₃ , TiO₂ , Au, Cu, Ag, In, Ru, Pd, Ir, graphene, and a conductive polymer.
  10. In paragraph 1, A solar cell in which the above connecting electrode is one or more of indium tin oxide (ITO), fluorine tin oxide (FTO), antimony tin oxide (ATO), zinc oxide, tin oxide, ZnoGa₂O₃ , ZnO- Al₂O₃ , platinum, ruthenium, palladium, iridium, rhodium (Rh), osmium (Os), carbon (C), WO₃ , TiO₂ , Au, Cu, Ag, In, Ru, Pd, Ir, graphene, and a conductive polymer.
  11. In paragraph 1, The above active layer comprises at least one of an active layer, an electron transport layer, and a hole transport layer, in a solar cell.
  12. In Paragraph 11, A solar cell in which the active layer comprises a perovskite light absorption layer.
  13. In paragraph 1, A solar cell having batteries individually placed in the above-mentioned spaced portions.
  14. In a method for manufacturing a solar cell according to any one of claims 1, 3, 7 and 9 through 13, Step of providing a substrate; The method includes the step of providing a plurality of unit cells spaced apart from each other so that the substrate is exposed; A method for manufacturing a solar cell, wherein the above unit cell comprises a first electrode, an active layer, and a second electrode.
  15. In Paragraph 14, A method for manufacturing a solar cell, wherein the step of providing the above unit cell is to perform a single scribing process.
  16. In Paragraph 14, A method for manufacturing a solar cell, further comprising the step of forming a connecting electrode that connects a plurality of unit cells.
  17. In Paragraph 14, The step of providing the above unit cell is A step of forming the first electrode on the substrate; A step of forming an active layer on the first electrode; and A method for manufacturing a solar cell comprising the step of forming the second electrode on the active layer.

Description

Solar cell and method of forming the same The present invention relates to a solar cell and a method for forming the same, and more specifically, to a solar cell having an insulating structure or non-generation region in which unit cells are spaced apart from each other and a substrate is exposed, and a method for forming the same. A solar cell is a device capable of directly converting solar energy into electrical energy by applying the photovoltaic effect. Solar cells can be classified into inorganic solar cells and organic solar cells depending on the material constituting the thin film. In organic/inorganic solar cells, the electrode structure that captures electrons and holes becomes more important in module structures where multiple cells are connected than in single unit cells. In particular, for various solar cell modules (e.g., OPV, CIGS, PSC, etc.) that adopt a monolithic process, each cell constituting the module is formed using multiple scribing steps (e.g., LASER scribing, etc.). Figure 1 is a schematic diagram illustrating a plurality of cell electrode structures of a conventional solar cell. As shown in Fig. 1, in a conventional solar cell, the respective layers constituting the electrode layer and the active layer are connected in a stepped manner. In the conventional structure, a scribing process is required for each layer due to the stepped structure, and a series connecting electrode (150) connecting the lower first electrode (120) and the upper second electrode (140) is placed between the cells. The problem arises because the connecting electrodes placed between cells increase the dead space. The stepped structure of conventional solar cells not only increases the non-generation area but also negatively affects device characteristics due to increased leakage current between cells. Figure 1 is a schematic diagram illustrating a plurality of cell electrode structures of a conventional solar cell. FIG. 2 is a schematic diagram of a solar cell according to one embodiment of the present invention. FIG. 3 is a perspective view showing a solar cell including a connecting electrode according to one embodiment of the present invention. Figure 4 is a diagram showing the measurement results of the solar cell of the present invention in a low-light environment. Figure 5 is a diagram showing the 1 sun (outdoor orientation) measurement results of the solar cell of the present invention. Figure 6 is a diagram showing a flowchart of a method for forming a solar cell of the present invention. FIG. 7 is a diagram showing the first process of the method for forming a unit cell of a solar cell of the present invention in more detail. FIG. 8 is a diagram showing the second process of the method for forming a unit cell of a solar cell of the present invention in more detail. FIG. 9 is a diagram showing the third process of the method for forming a unit cell of a solar cell of the present invention in more detail. Preferred embodiments of the present invention will be described below with reference to the attached drawings. Embodiments of the present invention may be modified in various different forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the present invention are provided to more fully explain the present invention to those with average knowledge in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation, and elements indicated by the same reference numerals in the drawings are the same elements. In the present invention, the term "solar cell" refers, in a narrow sense, to a module structure in which multiple unit cells are connected, but in a broad sense, to a device including a module structure and other components such as a battery. That is, the solar cell of the present invention may refer to a photovoltaic power generation system and may include a part that receives light and converts it into electricity (a solar cell in the narrow sense) and a component such as a battery that can convert the produced electricity into a specific form or store the produced electricity (a solar cell in the broad sense). In the present invention, the insulating structure or non-generation region refers to a structure or region in which the substrate is exposed between unit cells. Unlike conventional solar cells in which connecting electrodes are placed between unit cells, the solar cell of the present invention has a structure that minimizes leakage current and minimizes the area of the non-generation region by placing an insulating structure in which the substrate is exposed. As one embodiment, the solar cell of the present invention may be a monolithic solar cell. A monolithic device refers to a device in which various devices are integrated and stacked on a single substrate. FIG. 2 is a schematic diagram of a solar cell according to one embodiment of the present invention. Figure 2 is illustrated