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

Journal Article · · Nature Energy
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  1. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States). Materials Science Center
  3. Univ. of Toledo, OH (United States). Wright Center for Photovoltaics Innovation and Commercialization
  4. 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.
  5. Univ. of Colorado, Boulder, CO (United States)
  6. 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.
  7. 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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