Immobilizing Lead and Healing Surface Defects via Perfluorinated Tertiary Amine Molecules Enables High-Performance Sustainable Inverted Perovskite Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 40653972.
- Also identified by DOI 10.1002/adma.202508126.
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Abstract
The intrinsic instability and nonradiative recombination induced by surface defects hinder the further development of p-i-n inverted perovskite solar cells (PSCs). Simultaneously, the commercial application of inverted PSCs is limited by environmental unfriendliness resulting from lead leakage. Herein, a universal perfluorination strategy is reported to immobilize lead and passivate surface defects of perovskite films in inverted PSCs. It is demonstrated that perfluorinated perfluorotriethylamine (PFTEA) can form PFTEA·PbI<sub>2</sub> complex with PbI<sub>2</sub> via a strong coordination bond, which is favorable for suppressing lead leakage and promoting defect passivation. Due to much reduced surface nonradiative recombination, the PFTEA-modulated inverted PSCs deliver a fascinating certified stabilized power conversion efficiency (PCE) of 26.65%, a record efficiency value reported for PSCs using the vacuum flash evaporation technique. Moreover, the PFTEA-modulated devices maintain 92% of their initial PCE after 1000 h of continuous maximum power point tracking. This work provides a simple and effective avenue to advance the sustainable development of inverted photovoltaic technology through a perfluorination strategy.