Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/37499
Title: Tin-lead-metal halide perovskite solar cells with enhanced crystallinity and efficiency by addition of fluorinated long organic cation
Authors: Pitaro, Matteo
Pau, Riccardo
Duim, Herman
Mertens, Martijn
VAN GOMPEL, Wouter 
Portale, Giuseppe
LUTSEN, Laurence 
Loi, Maria Antonietta
Issue Date: 2022
Publisher: AIP Publishing
Source: Applied Physics Reviews, 9 (2) (Art N° 021407)
Abstract: Highly performing mixed Sn/Pb-metal halide perovskite solar cells (PSCs) are among the most promising options to reduce Pb content in perovskite devices and enable, owing to their reduced bandgap, the fabrication of all-perovskite tandem solar cells. Whereas pure-Pb perovskite devices exhibit efficiency up to 25.5%, alongside a high open-circuit voltage (asymptotic to 1.2 V), Sn-Pb PSCs still show lower performances (22.2%) due to higher open-circuit voltage losses. Here, we introduced 2,3,4,5,6-pentafluorophenethylammonium cations in a perovskite active layer of composition (FASnI(3))(0.5)(MAPbI(3))(0.5) to obtain highly oriented films with improved thermal stability. The treated films exhibit merged grains with no evidence of 2D structures, which could help to reduce the trap state density at the surface and grain boundaries. Solar cells fabricated with the fluorinated cation added to the active layer displayed reduced trap-assisted recombination losses and lower background carrier density, which leads to enhanced open-circuit voltages with respect to the reference samples and the active layers incorporating unfluorinated phenethylammonium cations. The best device reached an efficiency of 19.13%, with an open-circuit voltage of 0.84 V, which is substantially improved with respect to the reference sample showing 17.47% efficiency and 0.77 V open-circuit voltage. More importantly, the fluorinated cations' addition is instrumental to improve the device's thermal stability; 90.3% of the solar cell initial efficiency is maintained after 90 min of thermal stress at 85 & nbsp;C in a nitrogen atmosphere.& nbsp;Published under an exclusive license by AIP Publishing.
Notes: Loi, MA (corresponding author), Univ Groningen, Zernike Inst Adv Mat, Photophys & OptoElect Grp, Nijenborgh 4, NL-9747 AG Groningen, Netherlands.
M.A.Loi@rug.nl
Document URI: http://hdl.handle.net/1942/37499
ISSN: 1931-9401
e-ISSN: 1931-9401
DOI: 10.1063/5.0083642
ISI #: WOS:000792825200001
Rights: 2022 Author(s). Published under an exclusive license by AIP Publishing.
Category: A1
Type: Journal Contribution
Validations: ecoom 2023
Appears in Collections:Research publications

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