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Role of Self-Trapped Excitons in the Broadband Emission of Lead-Free Perovskite-Inspired Cu2AgBiI6

Grandhi, G. Krishnamurthy ; Dhama, Rakesh ; Viswanath, Noolu Srinivasa Manikanta ; Lisitsyna, Ekaterina S. ; Al-Anesi, Basheer ; Dana, Jayanta ; Sugathan, Vipinraj LU orcid ; Caglayan, Humeyra and Vivo, Paola (2023) In Journal of Physical Chemistry Letters 14(18). p.4192-4199
Abstract

The perovskite-inspired Cu2AgBiI6 (CABI) absorber shows promise for low-toxicity indoor photovoltaics. However, the carrier self-trapping in this material limits its photovoltaic performance. Herein, we examine the self-trapping mechanism in CABI by analyzing the excited-state dynamics of its absorption band at 425 nm, which is responsible for the self-trapped exciton emission, using a combination of photoluminescence and ultrafast transient absorption spectroscopies. Photoexcitation in CABI rapidly generates charge carriers in the silver iodide lattice sites, which localize into the self-trapped states and luminesce. Furthermore, a Cu-Ag-I-rich phase that exhibits similar spectral responses as CABI is synthesized,... (More)

The perovskite-inspired Cu2AgBiI6 (CABI) absorber shows promise for low-toxicity indoor photovoltaics. However, the carrier self-trapping in this material limits its photovoltaic performance. Herein, we examine the self-trapping mechanism in CABI by analyzing the excited-state dynamics of its absorption band at 425 nm, which is responsible for the self-trapped exciton emission, using a combination of photoluminescence and ultrafast transient absorption spectroscopies. Photoexcitation in CABI rapidly generates charge carriers in the silver iodide lattice sites, which localize into the self-trapped states and luminesce. Furthermore, a Cu-Ag-I-rich phase that exhibits similar spectral responses as CABI is synthesized, and a comprehensive structural and photophysical study of this phase provides insights into the nature of the excited states of CABI. Overall, this work explains the origin of self-trapping in CABI. This understanding will play a crucial role in optimizing its optoelectronic properties. It also encourages compositional engineering as the key to suppressing self-trapping in CABI.

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author
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publishing date
type
Contribution to journal
publication status
published
in
Journal of Physical Chemistry Letters
volume
14
issue
18
pages
8 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:37115195
  • scopus:85156249645
ISSN
1948-7185
DOI
10.1021/acs.jpclett.3c00439
language
English
LU publication?
no
additional info
Publisher Copyright: © 2023 The Authors. Published by American Chemical Society.
id
9bc822eb-f865-4e5d-bb3c-e2b72c0d4c44
date added to LUP
2026-09-22 09:39:10
date last changed
2026-10-07 08:42:21
@article{9bc822eb-f865-4e5d-bb3c-e2b72c0d4c44,
  abstract     = {{<p>The perovskite-inspired Cu<sub>2</sub>AgBiI<sub>6</sub> (CABI) absorber shows promise for low-toxicity indoor photovoltaics. However, the carrier self-trapping in this material limits its photovoltaic performance. Herein, we examine the self-trapping mechanism in CABI by analyzing the excited-state dynamics of its absorption band at 425 nm, which is responsible for the self-trapped exciton emission, using a combination of photoluminescence and ultrafast transient absorption spectroscopies. Photoexcitation in CABI rapidly generates charge carriers in the silver iodide lattice sites, which localize into the self-trapped states and luminesce. Furthermore, a Cu-Ag-I-rich phase that exhibits similar spectral responses as CABI is synthesized, and a comprehensive structural and photophysical study of this phase provides insights into the nature of the excited states of CABI. Overall, this work explains the origin of self-trapping in CABI. This understanding will play a crucial role in optimizing its optoelectronic properties. It also encourages compositional engineering as the key to suppressing self-trapping in CABI.</p>}},
  author       = {{Grandhi, G. Krishnamurthy and Dhama, Rakesh and Viswanath, Noolu Srinivasa Manikanta and Lisitsyna, Ekaterina S. and Al-Anesi, Basheer and Dana, Jayanta and Sugathan, Vipinraj and Caglayan, Humeyra and Vivo, Paola}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{18}},
  pages        = {{4192--4199}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{Role of Self-Trapped Excitons in the Broadband Emission of Lead-Free Perovskite-Inspired Cu<sub>2</sub>AgBiI<sub>6</sub>}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.3c00439}},
  doi          = {{10.1021/acs.jpclett.3c00439}},
  volume       = {{14}},
  year         = {{2023}},
}