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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- 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.
- 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
- Alternate ID(s):
- OSTI ID: 2283540
- 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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