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KR-20260066501-A - AN ASSEMBLY FOR SOLAR CELL AND A PEROVSKITE SOLAR CELL COMPRISING THE SAME

KR20260066501AKR 20260066501 AKR20260066501 AKR 20260066501AKR-20260066501-A

Abstract

The present invention relates to an assembly for a solar cell and a perovskite solar cell including the same. Specifically, by including a compound having a specific structure in the buffer layer, the invention solves the problem of parasitic absorption caused by the formation of a thick electron transport layer due to H₂O, a reactant, in the formation of an inorganic SnO₂ buffer layer, and improves power conversion efficiency and safety.

Inventors

  • 안세진
  • 신동협
  • 송수민
  • 이상민
  • 이아름
  • 황인찬
  • 변준섭
  • 홍성준
  • 정인영
  • 곽지혜
  • 조아라
  • 안승규
  • 박주형
  • 김기환

Assignees

  • 한국에너지기술연구원

Dates

Publication Date
20260512
Application Date
20241104

Claims (9)

  1. electron transport layer; and An assembly for a solar cell comprising a buffer layer provided on the electron transport layer and containing the following chemical formula 1: [Chemical Formula 1] Each of the above R1 , R2 , R5 , and R6 is a substituted or unsubstituted methylene group or a substituted or unsubstituted straight-chain or branched-chain alkylene group having 2 to 10 carbon atoms, and Each of the above R3 , R4 , R7 , and R8 is a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, or a substituted or unsubstituted straight-chain or branched-chain alkyl group having 3 to 10 carbon atoms, and The above n is an integer between 1 and 10.
  2. In claim 1, An assembly for a solar cell having a molecular weight of Chemical Formula 1 of the above formula of 400 g/mol or more and 800 g/mol or less.
  3. In claim 1, A compound for a buffer layer of a solar cell in which the above chemical formula 1 is the following chemical formula 2 or chemical formula 3: [Chemical Formula 2] [Chemical Formula 3]
  4. In claim 1, An assembly for a solar cell in which the electron transport layer comprises a compound having 30 to 80 carbon atoms.
  5. Comprising an assembly for a solar cell according to any one of claims 1 to 4, A perovskite solar cell having a first transparent electrode layer; the buffer layer; the electron transport layer; the perovskite-based light absorption layer; the hole transport layer; and a second transparent electrode layer sequentially provided.
  6. In claim 5, A perovskite solar cell wherein each of the first transparent electrode layer and the second transparent electrode layer comprises a material selected from the group consisting of instrinsic-ZnO (intrinsic zinc oxide, i-ZnO), indium tin oxide (ITO), indium zinc oxide (IZO), zinc tin oxide (ZTO), aluminum-doped zinc oxide (Al-doped ZnO: AZO), boron-doped zinc oxide (B-doped ZnO: BZO), fluorine-doped tin oxide (F-doped SnO: FTO), and combinations thereof.
  7. In claim 5, A perovskite solar cell in which the above perovskite-based light absorption layer comprises an organic-inorganic complex halide perovskite compound of the following chemical formula 4: [Chemical Formula 4] ABX 3 The above A is one selected from the group consisting of CH₃NH₃ , HC( NH₂ ) ₂ , Cs, Rb , and combinations thereof, and The above B is one selected from the group consisting of Pb, Sn, and combinations thereof, and The above X is one selected from the group consisting of Cl, Br, I and combinations thereof.
  8. In claim 7, In the above chemical formula 4, The above A is represented by the following chemical formula 5, and The above B is represented by the following chemical formula 6, and The above X3 is a perovskite solar cell represented by the following chemical formula 7: [Chemical Formula 5] [CH 3 NH 3 ] 1-abc [HC(NH 2 ) 2 ] a Cs b Rb c [Chemical Formula 6] Pb 1-p Sn p [Chemical Formula 7] Cl 3-lm B l I m The above a is 0≤a≤1, the above b is 0≤b≤1, and the above c is 0≤c≤1, and The above p is 0≤a≤1, and The above l is 0≤l≤3 and the above m is 0≤m≤3.
  9. In claim 5, The hole transport layer above is NiOx (0<x≤3), Me-4PACz ([4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid), MeO-2PACz ([2-(3,6-Dimethoxy-9H-carbazol-9-yl)ethyl]phosphonic acid), MEO-4PACZ ([4-(3,6-Dimethoxy-9H-carbazol-9-yl)butyl]phosphonic acid), 2PACz ([2-(9H-Carbazol-9-yl)ethyl]phosphonic acid), Br2-EPT, poly-[bis(4-phenyl)(2,4,6-trimethylphenyl)amine](PTAA), polyaniline, polypyrrole, poly-3,4-ethylenedioxythiophene-polystyrenesulfonate (PEDOT:PSS), spiro-myotadi (Spiro-MeOTAD), A perovskite solar cell comprising a material selected from the group consisting of polyaniline-camphosulfonic acid (PANI-CSA) and combinations thereof.

Description

An assembly for a solar cell and a perovskite solar cell comprising the same The present invention relates to an assembly for a solar cell and a perovskite solar cell including the same. Specifically, by including a compound having a specific structure in the buffer layer, the invention solves the problem of parasitic absorption caused by the formation of a thick electron transport layer due to H₂O, a reactant, in the formation of an inorganic SnO₂ buffer layer, and improves power conversion efficiency and safety. With the launch of the new climate regime through the Paris Agreement, the Korean government aims to reduce greenhouse gas emissions by 37% compared to the 2030 Business As Usual (BAU) forecast of 850 million tons. Consequently, solar cell technology is expected to generate economic value based on the Paris Agreement and the national strategy for green growth. The solar power market has continued to experience remarkable growth over the past few years due to factors such as the severity of climate change, increasing concern over environmental pollution, and rising energy demand. Silicon solar cells, which currently account for a large share of the market, possess high photovoltaic conversion efficiency but have drawbacks, including a relatively low light absorption coefficient, expensive wafer costs, complex manufacturing processes, and the need for high-temperature heat treatment. To address these issues, thin-film solar cells are garnering attention for their high light absorption coefficients, which allow them to absorb and utilize sufficient light with only a small amount of material. Perovskite solar cells have the advantage of being able to be used as single-junction opaque solar cells, as well as as semi-transparent (BIPV) or top cells in tandem, by having the band gap (Eg) of the perovskite light-absorbing layer tunability. To be used as part of a semi-transparent (BIPV) or tandem solar cell, the metal back electrode must be changed to a transparent electrode structure. Although a sputtering process is performed to form such a transparent electrode, there is a problem where the electron transport layer is damaged by the shock caused by sputtering. To prevent this, a buffer layer was formed using SnO2 via the Atomic Layer Deposition (ALD) method; however, forming a buffer layer with SnO2 complicates the process and increases manufacturing costs due to the need for equipment and a separate layer, and there is a fundamental problem of SnO2 growth on the electron transport layer, so an organic buffer layer was added for interface control. However, the above organic buffer layer is structured to be added separately between the inorganic buffer layer and the electron transport layer, which makes the structure more complex than before, reduces permeability, and consequently causes a problem of reduced current density. FIG. 1 is a schematic diagram of an assembly for a solar cell according to one embodiment of the present invention. FIG. 2 is a schematic diagram of a perovskite solar cell according to one embodiment of the present invention. Figure 3 is a graph showing the short-circuit current according to the open-circuit voltage of Example 1, Comparative Example 1, and Comparative Example 2. Figure 4 is a graph showing the short-circuit current according to the open-circuit voltage of Example 2, Comparative Example 3, and Comparative Example 4. Figure 5 is a graph showing the short-circuit current according to the open-circuit voltage after 24 hours, 72 hours, and 1536 hours of Example 2 under dark conditions. Figure 6 is a graph showing the short-circuit current according to the open-circuit voltage after 0 hours, 24 hours, and 144 hours have elapsed under the dark conditions of Comparative Example 3. Figure 7 is a graph showing the power conversion efficiency over time under dark conditions of Example 2 and Comparative Example 3. Figure 8 is a graph showing the power conversion efficiency according to the buffer layer solution concentration of Example 2 and Comparative Example 4. In this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. In this specification, "A and/or B" means "A and B, or A or B". In the present specification, when a component is said to be located "on" another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components. In the present specification, "sequentially provided" may be stacked in order, and may not exclude other layers being provided between the stacked layers. The drawings attached to this specification illustrate preferred embodiments of the invention and explain the principles of the invention together with the description of the invention, but the scope of the invention is not limited thereto. Me