Research Highlights: Guanidinium Doping Enabled Low-temperature Fabrication of High-efficiency All-inorganic CsPbI2Br Perovskite Solar Cells

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All-inorganic perovskites, such as CsPbI2Br, have attracted increasing attention because of its potentially better thermal stability. However, a high-quality CsPbI2Br perovskite film usually requires a high fabrication temperature (> 200 ºC) and suffers from unwanted phase transition from a photo-active cubic phase to a photo-inactive orthorhombic phase.
In this work, we present a brand-new means to simultaneously stabilize the photo-active cubic phase and lower the fabrication temperature of perovskite solar cells with guanidinium cations (GA) doping.… Read More

Research Highlights: Manipulating the Mixed-Perovskite Crystallization Pathway Unveiled by In Situ GIWAXS

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Mixed perovskites have achieved substantial successes in boosting solar cell efficiency, but the complicated perovskite crystal formation pathway remains mysterious. Here, we report for the first time the detailed crystallization process of mixed perovskites (FA0.83MA0.17Pb(I0.83Br0.17)3) during spin-coating by in situ GIWAXS measurements, and three phase formation stages have been identified: I.… Read More

Research Highlights: Ag-Doped Halide Perovskite Nanocrystals for Tunable Band Structure and Efficient Charge Transport

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Heterovalent doping of halide perovskite nanocrystals (NCs), offering potential tunability in optical and electrical properties, remains a grand challenge. Here, we report for the first time a controlled doping of monovalent Ag+ into CsPbBr3 NCs via a facile room temperature synthesis method. Our results suggest that Ag+ ions act as substitutional dopants to replace Pb2+ ions in the perovskite NCs, shifting the Fermi level down-towards the valence band and in turn inducing a heavy p-type character.… Read More