Carrier control in Sn–Pb perovskites via 2D cation engineering for all-perovskite tandem solar cells with improved efficiency and stability

Tong, Jinhui; Jiang, Qi; Ferguson, Andrew J.; Palmstrom, Axel F.; Wang, Xiaoming; Hao, Ji; Dunfield, Sean P.; Louks, Amy E.; Harvey, Steven P.; Li, Chongwen; Lu, Haipeng; France, Ryan M.; Johnson, Samuel A.; Zhang, Fei; Yang, Mengjin; Geisz, John F.; McGehee, Michael D.; Beard, Matthew C.; Yan, Yanfa; Kuciauskas, Darius; Berry, Joseph J.; Zhu, Kai

doi:10.1038/s41560-022-01046-1

Title: Carrier control in Sn–Pb perovskites via 2D cation engineering for all-perovskite tandem solar cells with improved efficiency and stability

Journal Article · 12 June 2022 · Nature Energy

DOI: https://doi.org/10.1038/s41560-022-01046-1 · OSTI ID:1873671

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National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center
National Renewable Energy Lab. (NREL), Golden, CO (United States). Materials Science Center
Univ. of Toledo, OH (United States). Wright Center for Photovoltaics Innovation and Commercialization
National Renewable Energy Lab. (NREL), Golden, CO (United States). Materials Science Center; Univ. of Colorado, Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States). Renewable and Sustainable Energy Inst.
Univ. of Colorado, Boulder, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center; Univ. of Colorado, Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States). Renewable and Sustainable Energy Inst.
National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center; Univ. of Colorado, Boulder, CO (United States). Renewable and Sustainable Energy Inst.

All-perovskite tandem solar cells are promising for achieving photovoltaics with power conversion efficiencies above the detailed balance limit of single-junction cells, while retaining the low cost, light weight and other advantages associated with metal halide perovskite photovoltaics. However, the efficiency and stability of all-perovskite tandem cells are limited by the Sn-Pb-based narrow-bandgap perovskite cells. Here we show that the formation of quasi-two-dimensional (quasi-2D) structure (PEA)₂GAPb₂I₇ from additives based on mixed bulky organic cations phenethylammonium (PEA+) and guanidinium (GA+) provides critical defect control to substantially improve the structural and optoelectronic properties of the narrow-bandgap (1.25 eV) Sn-Pb perovskite thin films. Additionally, this 2D additive engineering results in Sn-Pb-based absorbers with low dark carrier density (~1.3 x 10¹⁴ cm^-3), long bulk carrier lifetime (~9.2 us) and low surface recombination velocity (~1.4 cm s^-1), leading to 22.1%-efficient single-junction Sn-Pb perovskite cells and 25.5%-efficient all-perovskite two-terminal tandems with high photovoltage and long operational stability.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308; EE0008551

OSTI ID:: 1873671

Report Number(s):: NREL/JA-5900-81222; MainId:81995; UUID:97e7bb73-68dc-4f8a-b870-eefee71d6690; MainAdminID:64719

Journal Information:: Nature Energy, Journal Name: Nature Energy Journal Issue: 7 Vol. 7; ISSN 2058-7546

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Carrier control in Sn–Pb perovskites via 2D cation engineering for all-perovskite tandem solar cells with improved efficiency and stability

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