Unveiling the Impact of Organic Spacer Cations on Auger Recombination in Layered Halide Perovskites
Furuhashi, Tomoki ; Kanwat, Anil ; Ramesh, Sankaran LU
; Mathews, Nripan
and Sum, Tze Chien
(2023)
In Advanced Optical Materials
- Abstract
A library of large organic cation spacers is available for engineering the performance of layered two-dimensional (2D) halide perovskite devices. Despite extensive photophysics studies, there remains a research gap over the structure-function relations in 2D perovskites, especially the underlying factors influencing the Auger recombination (AR) process. Herein, the contributions of exciton binding energy, exciton-phonon coupling, and defects/film morphology to the AR process in 2D perovskites are examined. Phenyl-alkyl-ammonium cations with different lengths of attached alkyl groups, commonly used in blue light-emitting diodes, are investigated. The findings reveal an order of magnitude higher threshold carrier density for the AR onset... (More)
A library of large organic cation spacers is available for engineering the performance of layered two-dimensional (2D) halide perovskite devices. Despite extensive photophysics studies, there remains a research gap over the structure-function relations in 2D perovskites, especially the underlying factors influencing the Auger recombination (AR) process. Herein, the contributions of exciton binding energy, exciton-phonon coupling, and defects/film morphology to the AR process in 2D perovskites are examined. Phenyl-alkyl-ammonium cations with different lengths of attached alkyl groups, commonly used in blue light-emitting diodes, are investigated. The findings reveal an order of magnitude higher threshold carrier density for the AR onset as well as a reduced AR in cations with longer alkyl chain length. Although possessing similar exciton binding energies, the exciton-phonon coupling strength is found to play a major role in reducing the AR rate, with a smaller contribution from the defect states/film morphology. The findings can help provide further guidance on organic spacer cation engineering for highly efficient 2D perovskite light emitters.
(Less)
- author
- Furuhashi, Tomoki
; Kanwat, Anil
; Ramesh, Sankaran
LU
; Mathews, Nripan
and Sum, Tze Chien
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- epub
- keywords
- 2D perovskites, Auger recombination, defects, exciton-phonon coupling, organic spacer cations
- in
- Advanced Optical Materials
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:85173836935
- ISSN
- 2195-1071
- DOI
- 10.1002/adom.202301230
- language
- English
- LU publication?
- no
- id
- d4454df4-9a9c-4459-8865-9d2bea2b744d
- date added to LUP
- 2023-10-21 19:05:42
- date last changed
- 2023-10-23 11:09:22
@article{d4454df4-9a9c-4459-8865-9d2bea2b744d,
abstract = {{<p>A library of large organic cation spacers is available for engineering the performance of layered two-dimensional (2D) halide perovskite devices. Despite extensive photophysics studies, there remains a research gap over the structure-function relations in 2D perovskites, especially the underlying factors influencing the Auger recombination (AR) process. Herein, the contributions of exciton binding energy, exciton-phonon coupling, and defects/film morphology to the AR process in 2D perovskites are examined. Phenyl-alkyl-ammonium cations with different lengths of attached alkyl groups, commonly used in blue light-emitting diodes, are investigated. The findings reveal an order of magnitude higher threshold carrier density for the AR onset as well as a reduced AR in cations with longer alkyl chain length. Although possessing similar exciton binding energies, the exciton-phonon coupling strength is found to play a major role in reducing the AR rate, with a smaller contribution from the defect states/film morphology. The findings can help provide further guidance on organic spacer cation engineering for highly efficient 2D perovskite light emitters.</p>}},
author = {{Furuhashi, Tomoki and Kanwat, Anil and Ramesh, Sankaran and Mathews, Nripan and Sum, Tze Chien}},
issn = {{2195-1071}},
keywords = {{2D perovskites; Auger recombination; defects; exciton-phonon coupling; organic spacer cations}},
language = {{eng}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Advanced Optical Materials}},
title = {{Unveiling the Impact of Organic Spacer Cations on Auger Recombination in Layered Halide Perovskites}},
url = {{http://dx.doi.org/10.1002/adom.202301230}},
doi = {{10.1002/adom.202301230}},
year = {{2023}},
}