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首页> 外文期刊>Advanced energy materials >Interfacial Embedding for High-Efficiency and Stable Methylammonium-Free Perovskite Solar Cells with Fluoroarene Hydrazine
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Interfacial Embedding for High-Efficiency and Stable Methylammonium-Free Perovskite Solar Cells with Fluoroarene Hydrazine

机译：Interfacial Embedding for High-Efficiency and Stable Methylammonium-Free Perovskite Solar Cells with Fluoroarene Hydrazine

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摘要

Perovskite solar cells (PSCs) with state-of-the-art efficiencies containthermally unstable methylammonium (MA). Here, interfacial passivationwith pentafluorophenylhydrazine (5F-PHZ) to fabricate efficient and stableMA/Br-free PSCs is introduced. The 5F-PHZ surface treatment quenchesthe PbI_2 and δ-perovskite phase formed in the pristine film. The surfacepassivation ameliorates the film chemistries at the surface with modulationof interface band alignment as a consequence of halogen bonding withfluoroarene moieties or NH–NH2 terminals. This results in a much longercarrier lifetime with the passivation at the surface and grain boundariestrap centers. As a result, it boosts the power conversion efficiency (PCE)(area ≈ 1 cm~2) from 18.10% to 22.29% (V_(OC) ≈ 1.096–1.178 V) with superioroperational thermal stability. A certified PCE of 21.01% with a large area of≈1.026 cm~2 is also achieved. It is found that the surface passivation forms aninterfacial embedded layer subsequent to attenuation of defect densities andsuppression of ion migration, which is supported by density-function-theorycalculation. Importantly, this approach is effective in enhancing the PCE ofnarrow and wide bandgap perovskite systems. Thus, this work opens up anew technique for interface modulation with fluoroarene functionalderivatives to achieve superior device performance and stability.

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