PVTIME – On 14 October 2024, a new breakthrough of 28.2% conversion efficiency on all-perovskite tandem solar cell was announced by a research group at Nanjing University.
The new world record of 28.2% conversion efficiency of its kind was achieved on a 1.05 cm2 full perovskite tandem solar cell under steady state by the research group led by Tan Hairen from the College of Engineering and Applied Sciences of Nanjing University. And the result was certified by an authoritative international third-party certification organisation.
The paper was published in the journal Nature under the title “Homogenized contact in all-perovskite tandems using tailored 2D perovskite” on 14 October 2024, as an abstract of the paper attached below.
The fabrication of scalable all-perovskite tandem solar cells is considered an attractive route to commercialize perovskite photovoltaic modules. However, The certified efficiency of 1-cm2 scale all-perovskite tandem solar cells lags behind their small-area (~0.1 cm2) counterparts. This performance deficit originates from inhomogeneity in wide-bandgap (WBG) perovskite solar cells (PSCs) at a large scale. The inhomogeneity is known to be introduced at the bottom interface and within the perovskite bulk itself. Here we uncover another crucial source for the inhomogeneity – the top interface formed during the deposition of the electron transport layer (ETL, C60). Meanwhile, the poor ETL interface is also a significant limitation of device performance. We address this issue by introducing a mixture of 4-fluorophenethylamine (F-PEA) and 4-trifluoromethyl-phenylammonium (CF3-PA) to create a tailored two-dimensional perovskite layer (TTDL), in which F-PEA forms a two-dimensional perovskite at the surface reducing contact losses and inhomogeneity, CF3-PA enhances charge extraction and transport. As a result, we demonstrate a high open-circuit voltage of 1.35 V and an efficiency of 20.5% in 1.77-eV WBG PSCs at a square centimeter scale. By stacking with a narrow-bandgap perovskite sub-cell, we report 1.05 cm2 all-perovskite tandem cells delivering 28.5% (certified 28.2%) efficiency, the highest among all reported so far. Our work showcases the importance of treating the top perovskite/ETL contact for upscaling perovskite solar cells.
(https://www.nature.com/articles/s41586-024-08158-6)
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