Multilateral Passivation Strategy in Post-Synthetic Flexible Metal-Organic Frameworks for Enhancing Perovskite Solar Cells

Jian Zhang; Liping Hu; Wei Cao; Yayu Dong; Debin Xia; Kaifeng Lin; Yulin Yang

doi:10.1021/acs.inorgchem.3c01618

Multilateral Passivation Strategy in Post-Synthetic Flexible Metal-Organic Frameworks for Enhancing Perovskite Solar Cells

Inorg Chem. 2023 Jul 24;62(29):11690-11700. doi: 10.1021/acs.inorgchem.3c01618. Epub 2023 Jul 12.

Authors

Jian Zhang¹, Liping Hu¹, Wei Cao¹, Yayu Dong¹, Debin Xia¹, Kaifeng Lin¹, Yulin Yang¹

Affiliation

¹ MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.

PMID: 37437255
DOI: 10.1021/acs.inorgchem.3c01618

Abstract

The photovoltaic performance of perovskite solar cells is severely limited by the innate defects of perovskite films. Metal-organic framework (MOF)-based additives with luxuriant skeleton structures and tailored functional groups show a huge potential to solve these problems. Here, a multilateral passivation strategy is performed by introducing two alkyl-sulfonic acid functionalized MOFs, MIL-88B-1,3-SO₃H and MIL-88B-1,4-SO₃H, respectively, obtained from MIL-88B-NH₂ through a post-synthetic process, for coordinating the lead defects and inhibiting non-radiative recombination. The flexible MIL-88B-type frameworks endow both functionalized MOFs with excellent electrical conductivity and preferable carrier transport in the hole-transport materials. Compared with the original MIL-88B-NH₂ and MIL-88B-1,4-SO₃H, MIL-88B-1,3-SO₃H exhibits optimal steric hindrance and multiple passivation groups (-NH₂, -NH-, and -SO₃H), achieving the champion doped device with an enhanced power conversion efficiency (PCE) of 22.44% and excellent stability, which maintains 92.8% of the original PCE under ambient conditions (40% humidity and 25 °C) for 1200 h.