Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr3 Nanowires as a Model System
Oksenberg, Eitan ; Fai, Calvin ; Scheblykin, Ivan G. LU
; Joselevich, Ernesto
; Unger, Eva L.
LU
; Unold, Thomas
; Hages, Charles
and Merdasa, Aboma
LU
(2021)
In Advanced Functional Materials
31(22).
- Abstract
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... (More)
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.
(Less)
- author
- Oksenberg, Eitan
; Fai, Calvin
; Scheblykin, Ivan G.
LU
; Joselevich, Ernesto
; Unger, Eva L.
LU
; Unold, Thomas
; Hages, Charles
and Merdasa, Aboma
LU
- organization
- publishing date
- 2021-05-26
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- carrier diffusion, energy transport, perovskite nanowires, photoluminescence, photon recycling
- in
- Advanced Functional Materials
- volume
- 31
- issue
- 22
- article number
- 2010704
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85102917758
- ISSN
- 1616-301X
- DOI
- 10.1002/adfm.202010704
- language
- English
- LU publication?
- yes
- id
- a8be091e-00d1-4103-b715-2a811fd9f939
- date added to LUP
- 2021-04-01 09:58:28
- date last changed
- 2023-11-08 12:02:32
@article{a8be091e-00d1-4103-b715-2a811fd9f939,
abstract = {{<p>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 CsPbBr<sub>3</sub> 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 CsPbBr<sub>3</sub> nanowires, an ambipolar carrier mobility of μ = 35 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> 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.</p>}},
author = {{Oksenberg, Eitan and Fai, Calvin and Scheblykin, Ivan G. and Joselevich, Ernesto and Unger, Eva L. and Unold, Thomas and Hages, Charles and Merdasa, Aboma}},
issn = {{1616-301X}},
keywords = {{carrier diffusion; energy transport; perovskite nanowires; photoluminescence; photon recycling}},
language = {{eng}},
month = {{05}},
number = {{22}},
publisher = {{Wiley-Blackwell}},
series = {{Advanced Functional Materials}},
title = {{Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr<sub>3</sub> Nanowires as a Model System}},
url = {{http://dx.doi.org/10.1002/adfm.202010704}},
doi = {{10.1002/adfm.202010704}},
volume = {{31}},
year = {{2021}},
}