TY - JOUR
T1 - Enhanced optical path and electron diffusion length enable high-efficiency perovskite tandems
AU - Chen, Bin
AU - Baek, Se Woong
AU - Hou, Yi
AU - Aydin, Erkan
AU - De Bastiani, Michele
AU - Scheffel, Benjamin
AU - Proppe, Andrew
AU - Huang, Ziru
AU - Wei, Mingyang
AU - Wang, Ya Kun
AU - Jung, Eui Hyuk
AU - Allen, Thomas G.
AU - Van Kerschaver, Emmanuel
AU - García de Arquer, F. Pelayo
AU - Saidaminov, Makhsud I.
AU - Hoogland, Sjoerd
AU - De Wolf, Stefaan
AU - Sargent, Edward H.
N1 - Funding Information:
OSR-2018-CPF-3669.02. This work was in part supported by NPRP grant #8-086-1-017 from the Qatar National Research Fund.
Funding Information:
This research was made possible by Ontario Research Fund-Research Excellence program (ORF7-Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7); and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. This work was also supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No.
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - 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%.
AB - 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%.
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U2 - 10.1038/s41467-020-15077-3
DO - 10.1038/s41467-020-15077-3
M3 - Article
C2 - 32152324
AN - SCOPUS:85081641181
SN - 2041-1723
VL - 11
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 1257
ER -