Low-Bandgap Mixed Tin-Lead Iodide Perovskite Absorbers with Long Carrier Lifetimes for All-Perovskite Tandem Solar Cells

Kai Zhu, Dewei Zhao, Yue Yu, Changlei Wang, Weiqiang Liao, Niraj Shrestha, Corey Grice, Alexander Cimaroli, Lei Guan, Randy Ellingson, Xingzhong Zhao, Ren-Gen Xiong, Yanfa Yan

Research output: Contribution to journalArticlepeer-review

624 Scopus Citations

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%.

Original languageAmerican English
Article numberArticle No. 17018
Number of pages7
JournalNature Energy
Volume2
Issue number4
DOIs
StatePublished - 13 Mar 2017

Bibliographical note

Publisher Copyright:
© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.

NREL Publication Number

  • NREL/JA-5900-68901

Keywords

  • perovskite solar cells
  • tandom solar cells

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