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An international team of researchers has built an all-perovskite tandem solar cell based on a superior wide-bandgap perovskite cell with an efficiency of 20.5%. The 1 cm2-scale tandem device achieved the highest efficiency ever recorded to date for all-perovskite solar cells of this size.
An international team of researchers has built an all-perovskite tandem solar cell based on a superior wide-bandgap perovskite cell with an efficiency of 20.5%. The 1 cm2-scale tandem device achieved the highest efficiency ever recorded to date for all-perovskite solar cells of this size.
An international team of researchers led by Chinas Nanjing University has fabricated a 1.05 cm2 all-perovskite tandem solar cell with an efficiency of 28.2%.
“We focused on the performance degradation problem of all-perovskite tandem solar cells during the scaling process from 0.05 cm2 to 1 cm2. Therefore, our challenge is how to fabricate high-performance, large-area perovskite tandem devices. We believe that we need to focus on the interface problems of wide-bandgap perovskite single-junction solar cells first,” Yurui Wang, first author of the research , told pv magazine .
The team noted that the certified efficiency is a record for all-perovskite tandem cells of this size. The research appears in “ Homogenized contact in all-perovskite tandems using tailored 2D perovskite,” published in Nature .
The team addressed interface losses in the buckminster fullerene (C60) electron transport layer (ETL) of the top wide-gap perovskite cell. “We found that C60 deposition can cause deterioration of device uniformity, although we have discovered similar patterns in early published work, these phenomena have not received enough attention,” Wang explained.
The interface homogenization strategy consisted of applying a mixture of 4-fluorophenethylamine (F-PEA) and 4-trifluoromethyl-phenylammonium (CF3-PA) to create a two-dimensional (2D) layer that reduced contact losses and increased homogeneity, with CF3-PA enhancing charge extraction and transport.
The result was a superior cell with an open-circuit voltage of 1.35 V, an efficiency of 20.5%, and an energy bandgap of 1.77 eV at the cm2 scale. The team stacked it with a narrow-bandgap perovskite subcell to create a 1.05 cm2 all-perovskite tandem cell with a certified efficiency of 28.2%. Both results were certified by Japan’s Electrical Safety and Environmental Technology (JET) Laboratories.
The group concluded that the work "demonstrates the importance of treating the perovskite/ETL top contact for scaling up perovskite solar cells."
According to Wang, Renshine Solar, a startup founded by co-author Hairen Tan, is expected to further develop the technology.
“We will continue to pay attention to the scientific aspects of photovoltaic devices, develop the scalable preparation process of all-perovskite tandem solar cells, and continue to strive to promote the commercialization of this technology,” Wang said, referring to the future direction of the group’s work. “Our ultimate goal will be to achieve higher efficiency, larger area, higher stability and lower cost in tandem devices.”
The research group consisted of academics from Nanjing University, Renshine Solar, Jilin University and the Chinese Academy of Sciences, as well as scientists from the University of Cambridge (UK), Victoria University (Canada) and the Australian National University. |
