Cross-plane coherent acoustic phonons in two-dimensional organic-inorganic hybrid perovskites

Guo, Peijun; Stoumpos, Constantinos C.; Mao, Lingling; Sadasivam, Sridhar; Ketterson, John B.; Darancet, Pierre; Kanatzidis, Mercouri G.; Schaller, Richard D.

doi:10.1038/s41467-018-04429-9

Cross-plane coherent acoustic phonons in two-dimensional organic-inorganic hybrid perovskites

Journal Article · Tue May 22 00:00:00 EDT 2018 · Nature Communications

DOI:https://doi.org/10.1038/s41467-018-04429-9· OSTI ID:1461512

Guo, Peijun ^[1]; ^[2]; Mao, Lingling ^[2]; Sadasivam, Sridhar ^[1]; Ketterson, John B. ^[2]; Darancet, Pierre ^[1]; Kanatzidis, Mercouri G. ^[2]; Schaller, Richard D. ^[3]

Argonne National Lab. (ANL), Lemont, IL (United States)
Northwestern Univ., Evanston, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Northwestern Univ., Evanston, IL (United States)

Two-dimensional, Ruddlesden-Popper organic-inorganic hybrid layered perovskites (2D-RPs) are solution-grown semiconductors with prospective applications in next-generation optoelectronics. The heat-carrying, low-energy acoustic vibrations of 2D-RPs, which are important for heat management of 2D-RP-based devices, have remained unexplored. Here we report on the propagation of coherent longitudinal acoustic phonons along the cross-plane direction of 2D-RPs, following separate characterizations of below-bandgap refractive index for each 2D-RP. Through experiments on crystals of systematically varied perovskite layer thickness, we demonstrate significant reduction in both group velocity and propagation length of acoustic phonons in 2D-RPs as compared to the three-dimensional methylammonium lead iodide. As borne out by a minimal coarse-grained model, these vibrational properties arise from a large acoustic impedance mismatch between the alternating layers of perovskite sheets and bulky organic cations. Furthermore, our results inform on thermal transport in highly impedance-mismatched crystal sub-lattices and provide insights towards design of materials that exhibit highly anisotropic thermal dissipation properties.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1461512

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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