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Highly Efficient and Stable Perovskite Solar Modules Based on FcPF6 Engineered Spiro-OMeTAD Hole Transporting Layer
Qing Chang1,2, Yikai Yun3, Kexin Cao2,4
1Pen-Tung Sah Institute of Micro-Nano Science and Technology, Engineering Research Center of Micro-Nano Optoelectronic Materials and Devices, Ministry of Education, Fujian Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen, 361005, China.
Ferrocenium hexafluorophosphate (FcPF6) addition stabilizes perovskite solar cells by preventing lithium ion migration and improving hole extraction. This breakthrough enhances device efficiency and operational stability for scalable photovoltaic modules.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Spiro-OMeTAD doped with Li-TFSI is a key hole transport layer (HTL) in perovskite solar cells (PSCs), enabling high efficiencies.
- Uncontrolled lithium ion (Li+) migration in HTLs hinders the stability and scalability of PSCs.
Purpose of the Study:
- To address Li+ migration issues in spiro-OMeTAD HTLs for improved PSC stability and performance.
- To enhance hole extraction and interface stability in PSCs using a novel additive strategy.
Main Methods:
- Incorporation of ferrocenium hexafluorophosphate (FcPF6) as an additive in the spiro-OMeTAD HTL.
- Investigating the Fc-Li interaction to restrict Li+ movement.
- Utilizing the hexafluorophosphate anion to stabilize perovskite interfaces.
Main Results:
- Achieved power conversion efficiencies (PCEs) of 22.13% in 36 cm2 and 20.27% in 100 cm2 perovskite solar modules (PSMs).
- Demonstrated exceptional operational stability exceeding 1000 hours under ISOS-L-1 conditions.
- FcPF6 effectively enhanced hole extraction and suppressed Li+ migration, leading to stable interfaces.
Conclusions:
- FcPF6 serves as an effective additive for spiro-OMeTAD, enhancing hole extraction and crucially inhibiting Li+ migration.
- This strategy significantly improves the operational stability and efficiency of large-area perovskite solar modules.
- The FcPF6-based approach is vital for the industrialization of high-performance, stable perovskite solar cells.
