Authors
Dewei Zhao, Yue Yu, Changlei Wang, Weiqiang Liao, Niraj Shrestha, Corey R Grice, Alexander J Cimaroli, Lei Guan, Randy J Ellingson, Kai Zhu, Xingzhong Zhao, Ren-Gen Xiong, Yanfa Yan
Publication date
2017/3/1
Journal
Nature Energy
Volume
2
Issue
4
Pages
1-7
Publisher
Nature Publishing Group
Description
Tandem solar cells using only metal-halide perovskite sub-cells are an attractive choice for next-generation solar cells. However, the progress in developing efficient all-perovskite tandem solar cells has been hindered by the lack of high-performance low-bandgap perovskite solar cells. Here, we report efficient mixed tin–lead iodide low-bandgap (∼ 1.25 eV) perovskite solar cells with open-circuit voltages up to 0.85 V and over 70% external quantum efficiencies in the infrared wavelength range of 700–900 nm, delivering a short-circuit current density of over 29 mA cm− 2 and demonstrating suitability for bottom-cell applications in all-perovskite tandem solar cells. Our low-bandgap perovskite solar cells achieve a maximum power conversion efficiency of 17.6% and a certified efficiency of 17.01% with a negligible current–voltage hysteresis. When mechanically stacked with a∼ 1.58 eV bandgap perovskite top cell …
Total citations
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