Lanthanide 3D Supramolecular Framework Boosts Stable Perovskite Solar Cells with High UV Utilization

In this work, the ligand-to-metal charge transition and Forster resonance energy transfer process is exploited to derive lanthanide-organic framework (Tb-cpon) modified perovskite solar cells (PSCs) with enhanced performance under UV irradiation. Tb-cpon-modified PSCs exhibit rapid response and reduced degradation due to energy downconversion facilitated by effective coupling of UV-sensitive chromophores to lanthanide luminescent centers, enhancing the spectral response range of the composite films. Furthermore, the characteristic changes of precursor particle sizes suggest formation of Tb-cpon adducts as intermediate products, leading to enhanced crystallinity and reduced defect concentrations in the Tb-cpon-perovskite hybrid film. Accordingly, the Tb-cpon-modified PSC devices obtain a champion efficiency up to 23.72% as well as a sensitive photovoltaic conversion even under pure UV irradiation. Moreover, the unencapsulated devices maintain more than 80% of the initial efficiency after continuous irradiation under a 310 nm UV lamp for 24 h (from the Au electrode side), compared to 21% for the control devices. The antenna effect-mediated lanthanide-organic frameworks Tb-cpon greatly broaden the full-spectrum utilization and UV light sensitivity of the perovskite solar cells (PSCs) through the Forster resonance energy transfer process and energy downconversion effect. Structurally transformed 3D supramolecular skeletons as growth templates in perovskite crystallization maintain high efficiency and UV stability of PSCs under operating conditions by eliminating grain-boundary defects.image

Automated summary

Lanthanide-organic framework modified perovskite solar cells show enhanced performance under UV irradiation due to ligand-to-metal charge transition and Forster resonance energy transfer process. Energy downconversion facilitated by effective coupling of UV-sensitive chromophores improves spectral response and reduces degradation. The modified devices achieve a champion efficiency of 23.72% and maintain high efficiency after continuous UV irradiation.