Chemically-Modified 2D Covalent Organic Framework as an HTL Dopant for High-Performance, Stable, and Sustainable Perovskite Solar Cells and Modules

Fuqiang Li, Xiaofeng Huang*, Ying Li, Xiangrui Du, Eunhye Yang, Yoomi Ahn, Bo Ram Lee, Binghui Wu, Sung Heum Park*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Despite significant advances in perovskite solar cells (PeSCs), the operational instability and susceptibility to Pb leakage of PeSCs severely limit their widespread application. To address these issues, this study investigates the effect of doping the Spiro-OMeTAD hole-transporting layer (HTL) with a chemically-modified 2D conjugated covalent organic framework (Tp-Azo-COF) on the photovoltaic performance and stability of PeSCs. Enriched with abundant carbonyl (C═O) groups and azo (N═N) nodes, Tp-Azo-COF has excellent chelation and adsorption capabilities, and experimental results confirm that Tp-Azo-COF effectively decreases Pb leakage and Li-ion migration, improving the environmental safety and operational stability of PeSCs. The optimized PeSCs (0.12 cm2) exhibit an efficiency of 24.25%, a new benchmark for COF-modified devices, and maintain robust performance in large-area modules (18 cm2) with an efficiency of 21.96%. Under accelerated aging tests, including continuous light irradiation at maximum power point tracking for 980 h, the module demonstrated exceptional durability, with near-100% efficiency retention. The COF doping strategy developed in this study significantly enhances operational stability and minimizes Pb leakage in PeSCs, paving the way for the sustainable, large-scale deployment of perovskite photovoltaics.

Original languageEnglish
Article number2409811
JournalAdvanced Functional Materials
Volume34
Issue number51
DOIs
Publication statusPublished - 16 Dec 2024
Externally publishedYes

Keywords

  • Pb leakage
  • covalent organic framework
  • ion migration
  • operational stability
  • perovskite solar cells

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Li, F., Huang, X., Li, Y., Du, X., Yang, E., Ahn, Y., Lee, B. R., Wu, B., & Park, S. H. (2024). Chemically-Modified 2D Covalent Organic Framework as an HTL Dopant for High-Performance, Stable, and Sustainable Perovskite Solar Cells and Modules. Advanced Functional Materials, 34(51), Article 2409811. https://doi.org/10.1002/adfm.202409811