Wan-Jian Yin

Abstract Solution processing remains the dominant route to high-performance perovskite/silicon tandems, but it remains challenging to simultaneously achieve industrial scalability and long-term reliability.1-3 Thermal evaporation is more industrially viable, yet it has not been successfully demonstrated for large-area perovskite/Si tandems, largely due to the thermal degradation of formamidinium iodide (FAI) during high-temperature evaporation.

Abstract Hybrid two-step deposition offers a scalable route for fabricating metal halide perovskites in tandem architectures, particularly for achieving excellent conformality on textured substrates. However, using this approach for ultrawide-bandgap perovskites (>1.85 eV) remains a fundamental challenge, due to issues of incomplete conversion and inhomogeneous crystallization.

Perovskite solar cells (PSCs) exhibit large, reversible, and bidirectional light-soaking effects (LSEs); however, these anomalous LSEs are poorly understood, limiting the stability engineering and commercialization. We present a unified defect theory for the LSEs in lead halide perovskites by reconciling their defect photochemistry, ionic migration, and carrier dynamics.