Sr/Pb Alloying Stabilizes Wide‐Bandgap Perovskites for Durable Fully‐Textured Perovskite/Silicon Tandem Solar Cells

Engineering notes

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Chinese explanation / 中文解读

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Original abstract

ABSTRACT Double‐sided fully‐textured (3–5 µm) perovskite/silicon tandem solar cells (PS‐TSCs) emerge as a promising pathway for tandem photovoltaics due to their excellent optical management and low manufacturing costs. However, their commercialization is hindered by operational instability, largely attributable to ion migration within the wide‐bandgap perovskite top cell. Here, we report a B‐site cation alloying strategy employing strontium (Sr 2+ ) to enhance the stability of wide‐bandgap perovskites through local lattice engineering. Owing to its lower electronegativity and polarizability relative to lead (Pb 2+ ), Sr 2+ incorporation strengthens the metal‐halide bonding network, thereby forming a more rigid and ordered octahedral framework with weakened electron‐phonon coupling. The Sr/Pb alloyed perovskite films exhibit significantly enhanced stability under illumination and/or thermal stress. Fully‐textured PS‐TSCs incorporating this strategy achieve a power conversion efficiency of 31.66%. Importantly, encapsulated devices show less than 7% performance loss after more than 1391 h at maximum power point tracking, corresponding to a projected T 80 lifetime of approximately 6785 h under continuous 1‐sun illumination. Under thermal aging at 65°C, devices further demonstrate a T 90 lifetime exceeding 1100 h.

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