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Carrier control in Sn–Pb perovskites via 2D cation engineering for all-perovskite tandem solar cells with improved efficiency and stability
Nature Energy ( IF 56.7 ) Pub Date : 2022-06-13 , DOI: 10.1038/s41560-022-01046-1
Jinhui Tong, Qi Jiang, Andrew J. Ferguson, Axel F. Palmstrom, Xiaoming Wang, Ji Hao, Sean P. Dunfield, Amy E. Louks, Steven P. Harvey, Chongwen Li, Haipeng Lu, Ryan M. France, Samuel A. Johnson, Fei Zhang, Mengjin Yang, John F. Geisz, Michael D. McGehee, Matthew C. Beard, Yanfa Yan, Darius Kuciauskas, Joseph J. Berry, Kai Zhu

All-perovskite tandem solar cells are promising for achieving photovoltaics with power conversion efficiencies above the detailed balance limit of single-junction cells, while retaining the low cost, light weight and other advantages associated with metal halide perovskite photovoltaics. However, the efficiency and stability of all-perovskite tandem cells are limited by the Sn–Pb-based narrow-bandgap perovskite cells. Here we show that the formation of quasi-two-dimensional (quasi-2D) structure (PEA)2GAPb2I7 from additives based on mixed bulky organic cations phenethylammonium (PEA+) and guanidinium (GA+) provides critical defect control to substantially improve the structural and optoelectronic properties of the narrow-bandgap (1.25 eV) Sn–Pb perovskite thin films. This 2D additive engineering results in Sn–Pb-based absorbers with low dark carrier density (~1.3 × 1014 cm−3), long bulk carrier lifetime (~9.2 μs) and low surface recombination velocity (~1.4 cm s−1), leading to 22.1%-efficient single-junction Sn–Pb perovskite cells and 25.5%-efficient all-perovskite two-terminal tandems with high photovoltage and long operational stability.



中文翻译:

通过二维阳离子工程对 Sn-Pb 钙钛矿中的载流子进行控制,用于提高效率和稳定性的全钙钛矿串联太阳能电池

全钙钛矿串联太阳能电池有望实现光伏发电,其功率转换效率高于单结电池的详细平衡极限,同时保留了与金属卤化物钙钛矿光伏相关的低成本、重量轻和其他优势。然而,全钙钛矿串联电池的效率和稳定性受到基于 Sn-Pb 的窄带隙钙钛矿电池的限制。在这里我们展示了准二维(quasi-2D)结构(PEA)2 GAPb 2 I 7由基于混合大体积有机阳离子苯乙基铵(PEA +)和胍鎓(GA +) 提供关键的缺陷控制,以显着改善窄带隙 (1.25 eV) Sn-Pb 钙钛矿薄膜的结构和光电性能。这种二维增材工程产生了具有低暗载流子密度(~1.3 × 10 14  cm -3)、长体载流子寿命(~9.2 μs)和低表面复合速度(~1.4 cm s -1)的Sn-Pb基吸收体,导致效率为 22.1% 的单结 Sn-Pb 钙钛矿电池和效率为 25.5% 的全钙钛矿两端串联,具有高光电压和长运行稳定性。

更新日期:2022-06-14
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