Perovskite Multiple Solar Cell with Multilayer System as Interconnecting Layer

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This patent describes a multilayer connecting layer system for perovskite-based multi-junction (tandem or multijunction) solar cells. The invention uses a combination of a self-assembled monolayer (SAM) as a hole-selective contact (layer A) directly conformally deposited onto an oxide or silicon-based layer (layer B), which together enable efficient electrical connectivity between different sub-cells in a multi-junction solar cell, regardless of the surface texture or roughness.

Use CasesContent extracted from patent full text and abstract with AI.

• Manufacture of high-efficiency perovskite-silicon tandem solar cells for large-scale solar panels.
• Integration of perovskite top cells with bottom cells made from different materials (e.g., silicon, CIGSe, another perovskite) in photovoltaic modules.
• Production of solar cells using rough or textured bottom cell surfaces, which is common in industrial silicon wafer technologies.
• Application in advanced optoelectronic devices where efficient, conformal, and scalable charge transport layers are needed.
• Large-area, roll-to-roll processing of photovoltaic modules for industrial-scale solar power production.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables fabrication of multi-junction solar cells with high power conversion efficiency (over 21.6–26.6% demonstrated with this method).
• Fully conformal coverage, allowing use on rough or textured surfaces (such as textured silicon or CIGSe), which traditional methods cannot reliably cover, thereby reducing short circuits and performance loss.
• Reduces materials consumption and optical losses due to the use of ultra-thin, molecular monolayers as selective contact layers.
• Scalable and cost-effective: The SAM-based connecting layer can be applied using simple, solution-processable methods suitable for industrial (e.g., roll-to-roll) production without complex vacuum or polishing steps.
• Improves chemical and electro-energetic compatibility between layers, enhancing device stability and performance.
• Eliminates the need for heavy doping or thick interlayers that can degrade the stability or performance of perovskite sub-cells.

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Inventors & Applicants

Patent Abstract

The invention relates to a multi-layer system M as a connecting layer for perovskite multi-junction solar cells. The multi-layer system comprises at least two layers, layer A and layer B, wherein layer A is applied in a directly conforming manner to layer B, and wherein layer A is formed as a self-assembled monolayer from at least one molecule type according to formula (I), (I), where m = 1 to 2, L is a connecting fragment, A is an anchor group, and HTF is a hole-transporting fragment, and layer B is formed from at least one of the materials of the group of indium oxide, zinc oxide, tin oxide, nickel oxide, copper oxide, tungsten and molybdenum oxide or mixtures thereof; or silicon oxide or silicon, including amorphous, nano- or multi-crystalline, hydrogen-doped and oxidic layers, in particular a-Si:H, nc-Si:H, a-SiOx:H, nc-SiOx:H, µc-Si:H, µc-SiOx:H. The invention also relates to a method for producing a multi-layer system M according to the invention and to a multi-junction solar cell having a perovskite partial solar cell PZ and a multi-layer system M according to the invention as a connecting layer.