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Grain size control in quasi-two-dimensional perovskite thin film via intermediate phase engineering for efficient bound exciton generation

Li, Guohui ; Zhao, Wenhui ; Lin, Kai ; Zhao, Kefan ; Wang, Yujing ; Niu, Aohua ; Weng, Rong ; Zheng, Kaibo LU and Cui, Yanxia (2024) In SCIENCE CHINA Materials 67(12). p.3925-3931
Abstract

Quasi-two dimensional (2D) perovskites have emerged as a promising class of materials due to their remarkable photoluminescence efficiency, which stems from their exceptionally high exciton binding energies. The spatial confinement of excitons within smaller grain sizes could enhance the formation of biexcitons leading to higher radiative recombination efficiency. However, the synthesis of high-quality quasi-2D perovskite thin films with controllable grain sizes remains a challenging task. In this study, we present a facile method for achieving quasi-2D perovskite thin films with controllable grain sizes ranging from 500 to 900 nm. This is accomplished by intermediate phase engineering during the film fabrication process. Our results... (More)

Quasi-two dimensional (2D) perovskites have emerged as a promising class of materials due to their remarkable photoluminescence efficiency, which stems from their exceptionally high exciton binding energies. The spatial confinement of excitons within smaller grain sizes could enhance the formation of biexcitons leading to higher radiative recombination efficiency. However, the synthesis of high-quality quasi-2D perovskite thin films with controllable grain sizes remains a challenging task. In this study, we present a facile method for achieving quasi-2D perovskite thin films with controllable grain sizes ranging from 500 to 900 nm. This is accomplished by intermediate phase engineering during the film fabrication process. Our results demonstrate that quasi-2D perovskite films with smaller grain sizes exhibit more efficient bound exciton generation and a reduced stimulated emission threshold down to 15.89 µJ cm−2. Furthermore, femtosecond transient absorption measurements reveal that the decay time of bound excitons is shorter in quasi-2D perovskites with smaller grain sizes compared to that of those with larger grains at the same pump density, which is 230.5 ps. This observation suggests a more efficient exciton recombination process in the smaller grain size regime. Our findings would offer a promising approach for the development of efficient bound exciton lasers.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
bound exciton generation, grain size control, intermediate phase engineering, quasi-2D perovskite
in
SCIENCE CHINA Materials
volume
67
issue
12
pages
7 pages
publisher
Science China Press
external identifiers
  • scopus:85208042815
ISSN
2095-8226
DOI
10.1007/s40843-024-3127-5
language
English
LU publication?
yes
id
75a81bfa-1aae-41db-85e5-14617476d19a
date added to LUP
2024-12-11 09:33:48
date last changed
2025-04-04 13:58:07
@article{75a81bfa-1aae-41db-85e5-14617476d19a,
  abstract     = {{<p>Quasi-two dimensional (2D) perovskites have emerged as a promising class of materials due to their remarkable photoluminescence efficiency, which stems from their exceptionally high exciton binding energies. The spatial confinement of excitons within smaller grain sizes could enhance the formation of biexcitons leading to higher radiative recombination efficiency. However, the synthesis of high-quality quasi-2D perovskite thin films with controllable grain sizes remains a challenging task. In this study, we present a facile method for achieving quasi-2D perovskite thin films with controllable grain sizes ranging from 500 to 900 nm. This is accomplished by intermediate phase engineering during the film fabrication process. Our results demonstrate that quasi-2D perovskite films with smaller grain sizes exhibit more efficient bound exciton generation and a reduced stimulated emission threshold down to 15.89 µJ cm<sup>−2</sup>. Furthermore, femtosecond transient absorption measurements reveal that the decay time of bound excitons is shorter in quasi-2D perovskites with smaller grain sizes compared to that of those with larger grains at the same pump density, which is 230.5 ps. This observation suggests a more efficient exciton recombination process in the smaller grain size regime. Our findings would offer a promising approach for the development of efficient bound exciton lasers.</p>}},
  author       = {{Li, Guohui and Zhao, Wenhui and Lin, Kai and Zhao, Kefan and Wang, Yujing and Niu, Aohua and Weng, Rong and Zheng, Kaibo and Cui, Yanxia}},
  issn         = {{2095-8226}},
  keywords     = {{bound exciton generation; grain size control; intermediate phase engineering; quasi-2D perovskite}},
  language     = {{eng}},
  number       = {{12}},
  pages        = {{3925--3931}},
  publisher    = {{Science China Press}},
  series       = {{SCIENCE CHINA Materials}},
  title        = {{Grain size control in quasi-two-dimensional perovskite thin film via intermediate phase engineering for efficient bound exciton generation}},
  url          = {{http://dx.doi.org/10.1007/s40843-024-3127-5}},
  doi          = {{10.1007/s40843-024-3127-5}},
  volume       = {{67}},
  year         = {{2024}},
}