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B-Site Co-Alloying with Germanium Improves the Efficiency and Stability of All-Inorganic Tin-Based Perovskite Nanocrystal Solar Cells

Liu, Maning LU orcid ; Pasanen, Hannu ; Ali-Löytty, Harri ; Hiltunen, Arto ; Lahtonen, Kimmo ; Qudsia, Syeda ; Smått, Jan Henrik ; Valden, Mika ; Tkachenko, Nikolai V. and Vivo, Paola (2020) In Angewandte Chemie - International Edition 59(49). p.22117-22125
Abstract

Colloidal lead-free perovskite nanocrystals have recently received extensive attention because of their facile synthesis, the outstanding size-tunable optoelectronic properties, and less or no toxicity in their commercial applications. Tin (Sn) has so far led to the most efficient lead-free solar cells, yet showing highly unstable characteristics in ambient conditions. Here, we propose the synthesis of all-inorganic mixture Sn-Ge perovskite nanocrystals, demonstrating the role of Ge2+ in stabilizing Sn2+ cation while enhancing the optical and photophysical properties. The partial replacement of Sn atoms by Ge atoms in the nanostructures effectively fills the high density of Sn vacancies, reducing the surface traps... (More)

Colloidal lead-free perovskite nanocrystals have recently received extensive attention because of their facile synthesis, the outstanding size-tunable optoelectronic properties, and less or no toxicity in their commercial applications. Tin (Sn) has so far led to the most efficient lead-free solar cells, yet showing highly unstable characteristics in ambient conditions. Here, we propose the synthesis of all-inorganic mixture Sn-Ge perovskite nanocrystals, demonstrating the role of Ge2+ in stabilizing Sn2+ cation while enhancing the optical and photophysical properties. The partial replacement of Sn atoms by Ge atoms in the nanostructures effectively fills the high density of Sn vacancies, reducing the surface traps and leading to a longer excitonic lifetime and increased photoluminescence quantum yield. The resultant Sn-Ge nanocrystals-based devices show the highest efficiency of 4.9 %, enhanced by nearly 60 % compared to that of pure Sn nanocrystals-based devices.

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author
; ; ; ; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
lead-free, perovskite nanocrystals, solar cells, time-resolved photoluminescence, ultrafast transient absorption spectroscopy
in
Angewandte Chemie - International Edition
volume
59
issue
49
pages
9 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • pmid:32816348
  • scopus:85091445315
ISSN
1433-7851
DOI
10.1002/anie.202008724
language
English
LU publication?
no
id
63aa89ec-d57a-4582-9713-95b71d3e84d8
date added to LUP
2023-08-24 12:30:03
date last changed
2024-04-05 23:09:52
@article{63aa89ec-d57a-4582-9713-95b71d3e84d8,
  abstract     = {{<p>Colloidal lead-free perovskite nanocrystals have recently received extensive attention because of their facile synthesis, the outstanding size-tunable optoelectronic properties, and less or no toxicity in their commercial applications. Tin (Sn) has so far led to the most efficient lead-free solar cells, yet showing highly unstable characteristics in ambient conditions. Here, we propose the synthesis of all-inorganic mixture Sn-Ge perovskite nanocrystals, demonstrating the role of Ge<sup>2+</sup> in stabilizing Sn<sup>2+</sup> cation while enhancing the optical and photophysical properties. The partial replacement of Sn atoms by Ge atoms in the nanostructures effectively fills the high density of Sn vacancies, reducing the surface traps and leading to a longer excitonic lifetime and increased photoluminescence quantum yield. The resultant Sn-Ge nanocrystals-based devices show the highest efficiency of 4.9 %, enhanced by nearly 60 % compared to that of pure Sn nanocrystals-based devices.</p>}},
  author       = {{Liu, Maning and Pasanen, Hannu and Ali-Löytty, Harri and Hiltunen, Arto and Lahtonen, Kimmo and Qudsia, Syeda and Smått, Jan Henrik and Valden, Mika and Tkachenko, Nikolai V. and Vivo, Paola}},
  issn         = {{1433-7851}},
  keywords     = {{lead-free; perovskite nanocrystals; solar cells; time-resolved photoluminescence; ultrafast transient absorption spectroscopy}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{49}},
  pages        = {{22117--22125}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Angewandte Chemie - International Edition}},
  title        = {{B-Site Co-Alloying with Germanium Improves the Efficiency and Stability of All-Inorganic Tin-Based Perovskite Nanocrystal Solar Cells}},
  url          = {{http://dx.doi.org/10.1002/anie.202008724}},
  doi          = {{10.1002/anie.202008724}},
  volume       = {{59}},
  year         = {{2020}},
}