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 language | American English |
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Article number | Article No. 17018 |
Number of pages | 7 |
Journal | Nature Energy |
Volume | 2 |
Issue number | 4 |
DOIs | |
State | Published - 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