Buried Interface Regulation with TbCl₃ for Highly-Efficient All-Inorganic Perovskite/Silicon Tandem Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• All-inorganic perovskite materials offer thermal stability and potential for tandem solar cells.
• Current applications of these materials are in early developmental stages.
• CsPbI3 perovskite solar cells (PSCs) are suitable for perovskite/silicon tandem integration.

Purpose of the Study:

• To enhance the performance and stability of inverted CsPbI3 PSCs using a metal halide doping strategy.
• To improve the interface between the [4-(3,6-Dimethyl-9H-carbazol-9-yl) butyl] phosphonic acid (Me-4PACz) layer and the CsPbI3 perovskite layer.
• To develop efficient and stable perovskite/silicon tandem solar cells.

Main Methods:

• A metal halide doping strategy was implemented using terbium chloride (TbCl3).
• The doping improved the buried interface and CsPbI3 film crystallinity.
• Non-radiative recombination defects were passivated.

Main Results:

• Inverted CsPbI3 PSCs achieved a power conversion efficiency of 18.68%.
• The PSCs demonstrated excellent stability against water and oxygen.
• Perovskite/silicon tandem solar cells reached efficiencies of 29.40% (4T) and 25.44% (2T).

Conclusions:

• The study presents a novel approach for fabricating highly efficient and stable inverted all-inorganic PSCs.
• The developed PSCs are ideal for integration into perovskite/silicon tandem solar cells.
• This work contributes to advancing all-inorganic perovskite-based tandem solar cell technology.