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

doi:10.1002/adom.202102698

Title: Low Exciton Binding Energies and Localized Exciton–Polaron States in 2D Tin Halide Perovskites

Journal Article · 28 February 2022 · Advanced Optical Materials

DOI: https://doi.org/10.1002/adom.202102698 · OSTI ID:1889849

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University of Utah, Salt Lake City, UT (United States); SLAC
Brigham Young University, Provo, UT (United States)
University of Utah, Salt Lake City, UT (United States)
SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); University of Oulu (Finland)
SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

We report 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 spectro-scopic 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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Research Organization:: SLAC

Sponsoring Organization:: Dreyfus Foundation; European Union’s Horizon 2020; National Science Foundation; Sloan Foundation; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Walter Ahlström Foundation

Grant/Contract Number:: AC02-76SF00515; SC0019041

OSTI ID:: 1889849

Journal Information:: Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 9 Vol. 10; ISSN 2195-1071

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
electroabsorption
exciton binding energy
exciton–polaron states
lead halide perovskites
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Title: Low Exciton Binding Energies and Localized Exciton–Polaron States in 2D Tin Halide Perovskites

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