Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/142103
Title: Molecular engineering of pure 2D lead‐iodide perovskite solar absorbers displaying reduced band gaps and dielectric confinement
Authors: Febriansyah, Benny
Lekina, Yulia
Ghosh, Biplab
Harikesh, Padinhare Cholakkal
Koh, Teck Ming
Li, Yongxin
Shen, Zexiang
Mathews, Nripan
England, Jason
Keywords: Science::Chemistry::Inorganic chemistry
Science::Physics
Issue Date: 2020
Source: Febriansyah, B., Lekina, Y., Ghosh, B., Harikesh, P. C., Koh, T. M., Li, Y., . . . England, J. (2020). Molecular engineering of pure 2D lead‐iodide perovskite solar absorbers displaying reduced band gaps and dielectric confinement. ChemSusChem, 13(10), 2693-2701. doi:10.1002/cssc.202000028
Journal: ChemSusChem
Abstract: Pure 2D lead‐iodide perovskites typically demonstrate poor charge transport and compromised visible light absorption, relative to their 3D congeners. This hinders their potential use as solar absorbers. Herein, the systematic tuning of pyridinium‐based templating cations is reported to introduce intermolecular interactions that provide access to a series of new 2D lead‐iodide perovskites with reduced inter‐octahedral distortions (largest Pb‐(μ‐I)‐Pb bond angles of 170–179°) and very short inorganic interlayer separations (shortest I⋅⋅⋅I contacts ≤4.278–4.447 Å). These features manifest in reduced band gaps (2.35–2.46 eV) and relaxed dielectric confinement (excitonic binding energies of 130–200 meV). As a consequence, they demonstrate (more than ten‐fold) improved photo‐ and electrical conductivities relative to conventional 2D lead‐iodide perovskites, such as that templated by 2‐(1‐naphthyl)ethylammonium. Through computational studies, the origin of this behavior was shown to derive from a combination of short iodoplumbate layer separations and the aromaticity of the organic dications.
URI: https://hdl.handle.net/10356/142103
ISSN: 1864-5631
DOI: 10.1002/cssc.202000028
Rights: This is the accepted version of the following article: Febriansyah, B., Lekina, Y., Ghosh, B., Harikesh, P. C., Koh, T. M., Li, Y., . . . England, J. (2020). Molecular engineering of pure 2D lead‐iodide perovskite solar absorbers displaying reduced band gaps and dielectric confinement. ChemSusChem, 13(10), 2693-2701. doi:10.1002/cssc.202000028, which has been published in final form at https://doi.org/10.1002/cssc.202000028. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html].
Fulltext Permission: embargo_20210529
Fulltext Availability: With Fulltext
Appears in Collections:IGS Journal Articles

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