Solution-Processed All-Perovskite Multi-junction Solar Cells
Solution-Processed All-Perovskite Multi-junction Solar Cells
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DOI：
10.1016/j.joule.2019.01.007
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发表时间：
2019-02-20
期刊：
影响因子：
39.8
通讯作者：
Snaith, Henry J.
中科院分区：
文献类型：
--
作者：
McMeekin, David P.;Mahesh, Suhas;Snaith, Henry J.
多结器件结构可以提高光伏电池的功率转换效率(PCE)，超过单结热力学限制。然而，以溶液为基础的方法生产这些器件是具有挑战性的，因为底层的溶解是有问题的。通过使用高挥发性乙腈(CH3CN)/甲胺(CH3NH2)(ACN/MA)溶剂型钙钛矿溶液，我们展示了用于单片式全钙钛矿串联和三结太阳电池的完全溶液处理的吸收层、传输层和复合层。通过将Fa(0.83)Cs(0.17)Pb(Br0.7I0.3)(3)(1.94 eV)和MAPbI(3)(1.57 eV)结相结合，我们得到了大于15%(稳态)的两端串联PCE。结果表明，利用ACN/MA溶剂型体系可以制备出MAPB(0.75)Sn(0.25)I(3)(1.34 eV)窄禁带钙钛矿结构的三结型太阳能电池，这是第一个概念验证的单片式全钙钛矿型三结型太阳电池，开路电压达到2.83V。通过光学和电学模拟，我们估计最先进的三结型结构的PCE为26.7%。我们的工作为大规模、低成本、可打印的钙钛矿型多结太阳能电池开辟了新的可能性。
Multi-junction device architectures can increase the power conversion efficiency (PCE) of photovoltaic (PV) cells beyond the single-junction thermodynamic limit. However, these devices are challenging to produce by solution-based methods, where dissolution of underlying layers is problematic. By employing a highly volatile acetonitrile(CH3CN)/methylamine(CH3NH2) (ACN/MA) solvent-based perovskite solution, we demonstrate fully solution-processed absorber, transport, and recombination layers for monolithic all-perovskite tandem and triple-junction solar cells. By combining FA(0.83)Cs(0.17)Pb(Br0.7I0.3)(3) (1.94 eV) and MAPbI(3) (1.57 eV) junctions, we reach two-terminal tandem PCEs of more than 15% (steady state). We show that a MAPb(0.75)Sn(0.25)I(3) (1.34 eV) narrow band-gap perovskite can be processed via the ACN/MA solvent-based system, demonstrating the first proof-of-concept, monolithic all-perovskite triple-junction solar cell with an open-circuit voltage reaching 2.83 V. Through optical and electronic modeling, we estimate the achievable PCE of a state-of-the-art triple-junction device architecture to be 26.7%. Our work opens new possibilities for large-scale, low-cost, printable perovskite multi-junction solar cells.