Self-cleaning Spiro-OMeTAD via multimetal doping for perovskite photovoltaics.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40325000.
- Also identified by DOI 10.1038/s41467-025-59350-9 and PMC identifier 12053690.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Record power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) are usually achieved using organic spiro-OMeTAD. However, conventional doping with hygroscopic dopants (LiTFSI and tBP) leads to compromised device stability. We introduce a synergistic mixed doping strategy that utilizes a combination of metal-TFSI dopants-LiTFSI, KTFSI, NaTFSI, Ca(TFSI)<sub>2</sub>, and Mg(TFSI)<sub>2</sub>-to enhance doping efficiency while effectively removing hygroscopic contaminants from the Spiro-OMeTAD solution. This approach achieves PCEs exceeding 25% and significantly improves stability under harsh environmental conditions. Notably, Ca(TFSI)<sub>2</sub> and Mg(TFSI)<sub>2</sub> facilitate enhanced oxidative doping, while NaTFSI promotes interstitial doping in the bulk perovskite. Additionally, KTFSI serves as a catalytic agent, lowering the reaction energy barrier for the other dopants, thereby accelerating spiro-OMeTAD ion radical production. These findings underscore the potential of synergistic doping in optimizing the performance and longevity of photovoltaic devices.