The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Aboma Mendasa, MSc, PhD. Photo.

Aboma Merdasa

Researcher

Aboma Mendasa, MSc, PhD. Photo.

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr3 Nanowires as a Model System

Author

  • Eitan Oksenberg
  • Calvin Fai
  • Ivan G. Scheblykin
  • Ernesto Joselevich
  • Eva L. Unger
  • Thomas Unold
  • Charles Hages
  • Aboma Merdasa

Summary, in English

Understanding energy transport in metal halide perovskites is essential to effectively guide further optimization of materials and device designs. However, difficulties to disentangle charge carrier diffusion, photon recycling, and photon transport have led to contradicting reports and uncertainty regarding which mechanism dominates. In this study, monocrystalline CsPbBr3 nanowires serve as 1D model systems to help unravel the respective contribution of energy transport processes in metal-halide perovskites. Spatially, temporally, and spectrally resolved photoluminescence (PL) microscopy reveals characteristic signatures of each transport mechanism from which a robust model describing the PL signal accounting for carrier diffusion, photon propagation, and photon recycling is developed. For the investigated CsPbBr3 nanowires, an ambipolar carrier mobility of μ = 35 cm2 V−1 s−1 is determined, and is found that charge carrier diffusion dominates the energy transport process over photon recycling. Moreover, the general applicability of the developed model is demonstrated on different perovskite compounds by applying it to data provided in previous related reports, from which clarity is gained as to why conflicting reports exist. These findings, therefore, serve as a useful tool to assist future studies aimed at characterizing energy transport mechanisms in semiconductor nanowires using PL.

Department/s

  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • Ophthalmology Imaging Research Group

Publishing year

2021-05-26

Language

English

Publication/Series

Advanced Functional Materials

Volume

31

Issue

22

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Condensed Matter Physics
  • Materials Chemistry

Keywords

  • carrier diffusion
  • energy transport
  • perovskite nanowires
  • photoluminescence
  • photon recycling

Status

Published

Research group

  • Ophthalmology Imaging Research Group

ISBN/ISSN/Other

  • ISSN: 1616-301X