Remarkably Weak Anisotropy in Thermal Conductivity of Two-Dimensional Hybrid Perovskite Butylammonium Lead Iodide Crystals.

Journal Article (Journal Article)

Two-dimensional (2D) hybrid organic-inorganic perovskites consisting of alternating organic and inorganic layers are a new class of layered structures. They have attracted increasing interest for photovoltaic, optoelectronic, and thermoelectric applications, where knowing their thermal transport properties is critical. We carry out both experimental and computational studies on thermal transport properties of 2D butylammonium lead iodide crystals and find their thermal conductivity is ultralow (below 0.3 W m-1 K-1 ) with very weak anisotropy (around 1.5) among layered crystals. Further analysis reveals that the unique structure with the preferential alignment of organic chains and complicated energy landscape leads to moderately smaller phonon lifetimes in the out-of-plane direction and comparable phonon group velocities in in-plane and out-of-plane directions. These new findings may guide the future design of novel hybrid materials with desired thermal conductivity for various applications.

Full Text

Duke Authors

Cited Authors

  • Li, C; Ma, H; Li, T; Dai, J; Rasel, MAJ; Mattoni, A; Alatas, A; Thomas, MG; Rouse, ZW; Shragai, A; Baker, SP; Ramshaw, BJ; Feser, JP; Mitzi, DB; Tian, Z

Published Date

  • May 3, 2021

Published In

Volume / Issue

  • 21 / 9

Start / End Page

  • 3708 - 3714

PubMed ID

  • 33938755

Electronic International Standard Serial Number (EISSN)

  • 1530-6992

International Standard Serial Number (ISSN)

  • 1530-6984

Digital Object Identifier (DOI)

  • 10.1021/acs.nanolett.0c04550

Language

  • eng