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|Title:||Role of electron-phonon coupling in the thermal evolution of bulk Rashba-like spin-split lead halide perovskites exhibiting dual-band photoluminescence||Authors:||Steele, Julian A.
Yang, Ruo Xi
Sum, Tze Chien
Roeffaers, Maarten B. J.
|Keywords:||Science::Physics::Optics and light||Issue Date:||2019||Source:||Steele, J. A., Puech, P., Monserrat, B., Wu., B., Yang, R. X., Kirchartz, T., . . . Roeffaers, M. B. J. (2019). Role of electron-phonon coupling in the thermal evolution of bulk Rashba-like spin-split lead halide perovskites exhibiting dual-band photoluminescence. ACS Energy Letters, 4(9), 2205-2212. doi:10.1021/acsenergylett.9b01427||Journal:||ACS Energy Letters||Abstract:||The optoelectronic properties of lead halide perovskites strongly depend on their underlying crystal symmetries and dynamics, sometimes exhibiting a dual photoluminescence (PL) emission via Rashba-like effects. Here we exploit spin- and temperature-dependent PL to study single-crystal APbBr3 (A = Cs and methylammonium; CH3NH3) and evaluate the peak energy, intensity, and line width evolutions of their dual emission. Both perovskites exhibit temperature trends governed by two temperature regimes - above and below approximately 100 K - which impose different carrier scattering and radiative recombination dynamics. With increasing temperature, high-energy optical phonons activate near 100 K to drive energy splitting of the dual bands and induce line width broadening via electron-phonon coupling, with a stronger coupling constant inferred for carriers recombining by the spin-split indirect bands, compared to the direct ones. We find that the unusual thermal evolutions of all-inorganic and hybrid bulk lead bromide perovskites are comparable, suggesting A-site independence and the dominance of dynamic effects, and are best understood within a framework that accounts for Rashba-like effects.||URI:||https://hdl.handle.net/10356/138055||ISSN:||2380-8195||DOI:||10.1021/acsenergylett.9b01427||Rights:||This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsenergylett.9b01427||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||SPMS Journal Articles|
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