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

Peijun Guo, Constantinos C. Stoumpos, Lingling Mao, Sridhar Sadasivam, John B. Ketterson, Pierre Darancet, Mercouri G. Kanatzidis and Richard D. Schaller ()
Additional contact information
Peijun Guo: Argonne National Laboratory
Constantinos C. Stoumpos: Northwestern University
Lingling Mao: Northwestern University
Sridhar Sadasivam: Argonne National Laboratory
John B. Ketterson: Northwestern University
Pierre Darancet: Argonne National Laboratory
Mercouri G. Kanatzidis: Northwestern University
Richard D. Schaller: Argonne National Laboratory

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract 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 phonons, which are important for heat management of 2D RP-based devices, have remained unexplored. Here we report on the generation and propagation of coherent longitudinal acoustic phonons along the cross-plane direction of 2D RPs, following separate characterizations of below-bandgap refractive indices. Through experiments on single 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 counterpart. 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. 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.

Date: 2018
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-018-04429-9 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04429-9

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-018-04429-9

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().