Diamine chelates for increased stability in mixed Sn–Pb and all-perovskite tandem solar cells

IF 14.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Chongwen Li, Lei Chen, Fangyuan Jiang, Zhaoning Song, Xiaoming Wang, Adam Balvanz, Esma Ugur, Yuan Liu, Cheng Liu, Aidan Maxwell, Hao Chen, Yanjiang Liu, Zaiwei Wang, Pan Xia, You Li, Sheng Fu, Nannan Sun, Corey R. Grice, Xuefei Wu, Zachary Fink, Qin Hu, Lewei Zeng, Euidae Jung, Junke Wang, So Min Park, Deying Luo, Cailing Chen, Jie Shen, Yu Han, Carlo Andrea Riccardo Perini, Juan-Pablo Correa-Baena, Zheng-Hong Lu, Thomas P. Russell, Stefaan De Wolf, Mercouri G. Kanatzidis, David S. Ginger, Bin Chen, Yanfa Yan, Edward H. Sargent
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Abstract

Perovskite tandem solar cells show promising performance, but non-radiative recombination and its progressive worsening with time, especially in the mixed Sn–Pb low-bandgap layer, limit performance and stability. Here we find that mixed Sn–Pb perovskite thin films exhibit a compositional gradient, with an excess of Sn on the surface—and we show this gradient exacerbates oxidation and increases the recombination rate. We find that diamines preferentially chelate Sn atoms, removing them from the film surface and achieving a more balanced Sn:Pb stoichiometry, making the surface of the film resistive to the oxidation of Sn. The process forms an electrically resistive low-dimensional barrier layer, passivating defects and reducing interface recombination. Further improving the homogeneity of the barrier layer using 1,2-diaminopropane results in more uniform distribution and passivation. Tandems achieve a power conversion efficiency of 28.8%. Encapsulated tandems retain 90% of initial efficiency following 1,000 h of operating at the maximum power point under simulated one-sun illumination in air without cooling.

Abstract Image

二胺螯合物提高锡铅混合和全长晶串联太阳能电池的稳定性
过氧化物串联太阳能电池显示出良好的性能,但非辐射性重组及其随时间的逐渐恶化,尤其是在锡铅混合低带隙层中,限制了性能和稳定性。在这里,我们发现锡铅混合包晶体薄膜呈现出一种成分梯度,表面的锡过量--我们发现这种梯度加剧了氧化并增加了重组率。我们发现,二胺会优先螯合锡原子,将它们从薄膜表面移除,实现更平衡的锡:铅化学计量,从而使薄膜表面对锡的氧化具有抵抗力。这一过程形成了电阻性低维阻挡层,钝化了缺陷,减少了界面重组。使用 1,2-二氨基丙烷进一步提高阻挡层的均匀性,使其分布和钝化更加均匀。串联系统的功率转换效率达到 28.8%。在空气中模拟单太阳光照、无冷却的情况下,封装串联系统在最大功率点运行 1000 小时后,仍能保持 90% 的初始效率。
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来源期刊
CiteScore
24.40
自引率
6.00%
发文量
2398
审稿时长
1.6 months
期刊介绍: The flagship journal of the American Chemical Society, known as the Journal of the American Chemical Society (JACS), has been a prestigious publication since its establishment in 1879. It holds a preeminent position in the field of chemistry and related interdisciplinary sciences. JACS is committed to disseminating cutting-edge research papers, covering a wide range of topics, and encompasses approximately 19,000 pages of Articles, Communications, and Perspectives annually. With a weekly publication frequency, JACS plays a vital role in advancing the field of chemistry by providing essential research.
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