Multifunctional MOF@COF Nanoparticles Mediated Perovskite Films Management Toward Sustainable Perovskite Solar Cells

• Published in: Nano-micro letters Vol. 16; no. 1; pp. 171 - 14
• Main Authors: Dong, Yayu, Zhang, Jian, Zhang, Hongyu, Wang, Wei, Hu, Boyuan, Xia, Debin, Lin, Kaifeng, Geng, Lin, Yang, Yulin
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.12.2024; Springer Nature B.V; SpringerOpen
• Subjects: Adsorption; Conjugation; Covalence; Covalent bonds; Covalent organic frameworks; Crystal defects; Crystallization; Efficiency; Energy conversion efficiency; Engineering; Lead; Lead content; Lead leakage; Leakage; Metal-organic frameworks; Nanoparticles; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Open circuit voltage; Perovskite Solar Cells; Perovskites; Photovoltaic cells; Resource conservation; Resource Conservation & Recovery Act-US; Solar cells; Stability; Synergistic effect; Covalent organic frameworks; Stability; Metal–organic frameworks; Perovskite solar cells; Lead leakage
• ISSN: 2311-6706; 2150-5551; 2150-5551
• DOI: 10.1007/s40820-024-01390-9

Highlights Covalent organic frameworks (COFs) were in situ homogeneously growing on the surface of metal–organic framework (MOF-808) by a covalent bond to construct a core–shell MOF@COF nanoparticle. MOF@COF optimized the crystallinity of perovskite to achieve 23.61% efficiency with superior open circuit voltage (1.20 V). MOF-assisted COFs to ‘trap’ leaked lead ions by in situ chemical fixation and adsorption. The amount of lead leakage (<5 ppm) satisfied the laboratory assessment. Although covalent organic frameworks (COFs) with high π -conjugation have recently exhibited great prospects in perovskite solar cells (PSCs), their further application in PSCs is still hindered by face-to-face stacking and aggregation issues. Herein, metal–organic framework (MOF-808) is selected as an ideal platform for the in situ homogeneous growth of a COF to construct a core–shell MOF@COF nanoparticle, which could effectively inhibit COF stacking and aggregation. The synergistic intrinsic mechanisms induced by the MOF@COF nanoparticles for reinforcing intrinsic stability and mitigating lead leakage in PSCs have been explored. The complementary utilization of π -conjugated skeletons and nanopores could optimize the crystallization of large-grained perovskite films and eliminate defects. The resulting PSCs achieve an impressive power conversion efficiency of 23.61% with superior open circuit voltage (1.20 V) and maintained approximately 90% of the original power conversion efficiency after 2000 h (30–50% RH and 25–30 °C). Benefiting from the synergistic effects of the in situ chemical fixation and adsorption abilities of the MOF@COF nanoparticles, the amount of lead leakage from unpackaged PSCs soaked in water (< 5 ppm) satisfies the laboratory assessment required for the Resource Conservation and Recovery Act Regulation.