Low-bandgap mixed tin–lead iodide perovskite absorbers with long carrier lifetimes for all-perovskite tandem solar cells

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 and Yanfa Yan ()
Additional contact information
Dewei Zhao: The University of Toledo
Yue Yu: The University of Toledo
Changlei Wang: The University of Toledo
Weiqiang Liao: The University of Toledo
Niraj Shrestha: The University of Toledo
Corey R. Grice: The University of Toledo
Alexander J. Cimaroli: The University of Toledo
Lei Guan: The University of Toledo
Randy J. Ellingson: The University of Toledo
Kai Zhu: Chemistry and Nanoscience Center, National Renewable Energy Laboratory
Xingzhong Zhao: Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education, School of Physics and Technology, Wuhan University
Ren-Gen Xiong: Ordered Matter Science Research Center, Southeast University
Yanfa Yan: The University of Toledo

Nature Energy, 2017, vol. 2, issue 4, 1-7

Abstract: Abstract 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, our best all-perovskite 4-terminal tandem solar cell shows a steady-state efficiency of 21.0%.

Date: 2017
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DOI: 10.1038/nenergy.2017.18

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