Professor Li Jing and Associate Professor Yin Jun's team at our institute have made progress in the field of high-efficiency and stable perovskite solar modules.
Recently, the team led by Professor Li Jing and Associate Professor Yin Jun from the Sa Ben Dong Micro-Nano Science and Technology Research Institute at Xiamen University has achieved significant advancements in the field of perovskite solar cells (PSCs). Their work, titled "Highly Efficient and Stable Perovskite Solar Modules Based on FcPF6 Engineered Spiro-OMeTAD Hole Transporting Layer," has been published in the top-tier journal "Advanced Materials" in the field of materials and chemistry (IF = 27.4).
The main challenge for the commercialization of perovskite photovoltaics lies in the stable output of high-efficiency power under various environmental and operational conditions, which is particularly severe for perovskite photovoltaic devices based on the spiro-OMeTAD hole transporting layer (HTL): the well-established and familiar Li+ salt doping method in spiro-OMeTAD HTL materials is widely used in the preparation of high-efficiency n-i-p type PSC devices currently. However, the migration of Li+ under light or bias can accelerate the degradation of perovskites. In addition, the migration of other ions, including iodide and metal ions, at HTL-related interfaces also poses significant challenges to the practical application of perovskite solar modules (PSMs).
To address these issues, the research team introduced a multifunctional FcPF6 additive to regulate the performance of spiro-OMeTAD, thereby achieving high-efficiency and stable PSMs; the introduced Fc+ cation in FcPF6 can rapidly oxidize spiro-OMeTAD, and the reduced Fc byproduct strongly binds with Li+ in the HTL, inhibiting the migration of Li+; meanwhile, the PF6- anion can effectively stabilize the perovskite surface and prevent the upward migration of iodide ions through a coordination effect. Based on this strategy, the team achieved a power conversion efficiency (PCE) of over 25% for conventional PSC devices (0.12 cm2) and over 20% for 100 cm2 modules (with an effective area of 56 cm2); at the same time, the stability of the modules has also been significantly improved, maintaining an output efficiency of T87 even after 1000 hours of long-term aging tests under operational conditions. This work was jointly completed by the team of Academician Zheng Nanfeng, Professor Li Jing, and Associate Professor Yin Jun from Xiamen University, in collaboration with Researcher Zhao Zhiguo from the China Huaneng Group Clean Energy Research Institute, among others. Chang Qing, a 2021-level doctoral student at the Sa Ben Dong Micro-Nano Science and Technology Research Institute, is the first author of the first unit. The work was supported and funded by the China Huaneng Group Clean Energy Research Institute's science and technology project and the Jia Geng Innovation Laboratory's science and technology project.
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