Enhanced optical path and electron diffusion length enable high-efficiency perovskite tandems

Bin Chen, Se-Woong Baek, Yi Hou, Erkan Aydin, Michele De Bastiani, Benjamin Scheffel, Andrew Proppe, Ziru Huang, Mingyang Wei, Ya-Kun Wang, Eui-Hyuk Jung, Thomas G. Allen, Emmanuel Van Kerschaver, F. Pelayo García de Arquer, Makhsud I. Saidaminov, Sjoerd Hoogland, Stefaan De Wolf and Edward H. Sargent ()
Additional contact information
Bin Chen: University of Toronto
Se-Woong Baek: University of Toronto
Yi Hou: University of Toronto
Erkan Aydin: King Abdullah University of Science and Technology (KAUST)
Michele De Bastiani: King Abdullah University of Science and Technology (KAUST)
Benjamin Scheffel: University of Toronto
Andrew Proppe: University of Toronto
Ziru Huang: University of Toronto
Mingyang Wei: University of Toronto
Ya-Kun Wang: University of Toronto
Eui-Hyuk Jung: University of Toronto
Thomas G. Allen: King Abdullah University of Science and Technology (KAUST)
Emmanuel Van Kerschaver: King Abdullah University of Science and Technology (KAUST)
F. Pelayo García de Arquer: University of Toronto
Makhsud I. Saidaminov: University of Toronto
Sjoerd Hoogland: University of Toronto
Stefaan De Wolf: King Abdullah University of Science and Technology (KAUST)
Edward H. Sargent: University of Toronto

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Tandem solar cells involving metal-halide perovskite subcells offer routes to power conversion efficiencies (PCEs) that exceed the single-junction limit; however, reported PCE values for tandems have so far lain below their potential due to inefficient photon harvesting. Here we increase the optical path length in perovskite films by preserving smooth morphology while increasing thickness using a method we term boosted solvent extraction. Carrier collection in these films – as made – is limited by an insufficient electron diffusion length; however, we further find that adding a Lewis base reduces the trap density and enhances the electron-diffusion length to 2.3 µm, enabling a 19% PCE for 1.63 eV semi-transparent perovskite cells having an average near-infrared transmittance of 85%. The perovskite top cell combined with solution-processed colloidal quantum dot:organic hybrid bottom cell leads to a PCE of 24%; while coupling the perovskite cell with a silicon bottom cell yields a PCE of 28.2%.

Date: 2020
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DOI: 10.1038/s41467-020-15077-3

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