Fine Structure Splitting of Phonon-Assisted Excitonic Transition in (PEA)2PbI4 Two-Dimensional Perovskites

Posmyk, Katarzyna; Dyksik, Mateusz; Surrente, Alessandro; Zalewska, Katarzyna; Śmiertka, Maciej; Cybula, Ewelina; Paritmongkol, Watcharaphol; Tisdale, William A.; Plochocka, Paulina; Baranowski, Michał

doi:10.3390/nano13061119

Fine Structure Splitting of Phonon-Assisted Excitonic Transition in (PEA)2PbI4 Two-Dimensional Perovskites

Journal Article · Tue Mar 21 00:00:00 EDT 2023 · Nanomaterials

DOI:https://doi.org/10.3390/nano13061119· OSTI ID:1962705

; ; ; Zalewska, Katarzyna; Śmiertka, Maciej; Cybula, Ewelina; ; ; ;

Two-dimensional van der Waals materials exhibit particularly strong excitonic effects, which causes them to be an exceptionally interesting platform for the investigation of exciton physics. A notable example is the two-dimensional Ruddlesden–Popper perovskites, where quantum and dielectric confinement together with soft, polar, and low symmetry lattice create a unique background for electron and hole interaction. Here, with the use of polarization-resolved optical spectroscopy, we have demonstrated that the simultaneous presence of tightly bound excitons, together with strong exciton–phonon coupling, allows for observing the exciton fine structure splitting of the phonon-assisted transitions of two-dimensional perovskite (PEA)2PbI4, where PEA stands for phenylethylammonium. We demonstrate that the phonon-assisted sidebands characteristic for (PEA)2PbI4 are split and linearly polarized, mimicking the characteristics of the corresponding zero-phonon lines. Interestingly, the splitting of differently polarized phonon-assisted transitions can be different from that of the zero-phonon lines. We attribute this effect to the selective coupling of linearly polarized exciton states to non-degenerate phonon modes of different symmetries resulting from the low symmetry of (PEA)2PbI4 lattice.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0019345

OSTI ID:: 1962705

Alternate ID(s):: OSTI ID: 2421174

Journal Information:: Nanomaterials, Journal Name: Nanomaterials Journal Issue: 6 Vol. 13; ISSN 2079-4991; ISSN NANOKO

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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