Low exciton binding energies and localized exciton-polaron states in 2D tin halide perovskites
Hansen, Kameron R.; McClure, C. Emma; Powell, Daniel; Hsieh, Hao-Chieh; Flannery, Laura; Garden, Kelsey; Miller, Edwin J.; King, Daniel J.; Sainio, Sami; Nordlund, Dennis; Colton, John S.; Whittaker-Brooks, Luisa (2022-03-01)
Hansen, K. R., McClure, C. E., Powell, D., Hsieh, H.-C., Flannery, L., Garden, K., Miller, E. J., King, D. J., Sainio, S., Nordlund, D., Colton, J. S., Whittaker-Brooks, L., Low Exciton Binding Energies and Localized Exciton–Polaron States in 2D Tin Halide Perovskites. Adv. Optical Mater. 2022, 10, 2102698. https://doi.org/10.1002/adom.202102698
© 2022 Wiley-VCH GmbH. This is the peer reviewed version of the following article: Hansen, K. R., McClure, C. E., Powell, D., Hsieh, H.-C., Flannery, L., Garden, K., Miller, E. J., King, D. J., Sainio, S., Nordlund, D., Colton, J. S., Whittaker-Brooks, L., Low Exciton Binding Energies and Localized Exciton–Polaron States in 2D Tin Halide Perovskites. Adv. Optical Mater. 2022, 10, 2102698, which has been published in final form at https://doi.org/10.1002/adom.202102698. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
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https://urn.fi/URN:NBN:fi-fe2023032733353
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Abstract
Aside from band gap reduction, little is understood about the effect of the tin-for-lead substitution on the fundamental optical and optoelectronic properties of metal halide perovskites (MHPs), especially when transitioning from 3D to lower dimensional structures. Herein, we take advantage of the spectroscopic isolation of excitons in 2D MHPs to study the intrinsic differences between lead and tin MHPs. The exciton’s spectral fine structure indicates a larger polaron binding energy in tin MHPs. Additionally, the electroabsorption responses of the 2D MHPs demonstrates that tin MHPs have exciton binding energies 1.5–2× lower than that of their lead counterparts. Despite the lower binding energy, the excitons in tin MHPs are more Frenkel-like with small radii, small polarizabilities, and large dipole moments. These results are interpreted as consequences of small polaron formation and disorder-induced dipole moments. This work highlights the wide range of intrinsic differences between lead and tin MHPs as well as the complexity of excited states in these systems.
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