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Antimony-Bismuth Alloying : The Key to a Major Boost in the Efficiency of Lead-Free Perovskite-Inspired Photovoltaics

Al-Anesi, Basheer ; Grandhi, G. Krishnamurthy ; Pecoraro, Adriana ; Sugathan, Vipinraj ; Viswanath, Noolu Srinivasa Manikanta ; Ali-Löytty, Harri ; Liu, Maning LU orcid ; Ruoko, Tero Petri ; Lahtonen, Kimmo and Manna, Debjit , et al. (2023) In Small 19(46).
Abstract

The perovskite-inspired Cu2AgBiI6 (CABI) material has been gaining increasing momentum as photovoltaic (PV) absorber due to its low toxicity, intrinsic air stability, direct bandgap, and a high absorption coefficient in the range of 105 cm−1. However, the power conversion efficiency (PCE) of existing CABI-based PVs is still seriously constrained by the presence of both intrinsic and surface defects. Herein, antimony (III) (Sb3+) is introduced into the octahedral lattice sites of the CABI structure, leading to CABI-Sb with larger crystalline domains than CABI. The alloying of Sb3+ with bismuth (III) (Bi3+) induces changes in the local structural symmetry that... (More)

The perovskite-inspired Cu2AgBiI6 (CABI) material has been gaining increasing momentum as photovoltaic (PV) absorber due to its low toxicity, intrinsic air stability, direct bandgap, and a high absorption coefficient in the range of 105 cm−1. However, the power conversion efficiency (PCE) of existing CABI-based PVs is still seriously constrained by the presence of both intrinsic and surface defects. Herein, antimony (III) (Sb3+) is introduced into the octahedral lattice sites of the CABI structure, leading to CABI-Sb with larger crystalline domains than CABI. The alloying of Sb3+ with bismuth (III) (Bi3+) induces changes in the local structural symmetry that dramatically increase the formation energy of intrinsic defects. Light-intensity dependence and electron impedance spectroscopic studies show reduced trap-assisted recombination in the CABI-Sb PV devices. CABI-Sb solar cells feature a nearly 40% PCE enhancement (from 1.31% to 1.82%) with respect to the CABI devices mainly due to improvement in short-circuit current density. This work will promote future compositional design studies to enhance the intrinsic defect tolerance of next-generation wide-bandgap absorbers for high-performance and stable PVs.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
defects, low-toxicity, perovskite-inspired material, photovoltaics, wide-bandgap
in
Small
volume
19
issue
46
publisher
John Wiley & Sons Inc.
external identifiers
  • pmid:37452442
  • scopus:85164808090
ISSN
1613-6810
DOI
10.1002/smll.202303575
language
English
LU publication?
no
id
e8d7737e-3583-417b-a2c1-a93c5e2b32e1
date added to LUP
2023-08-24 11:58:19
date last changed
2024-04-20 02:30:26
@article{e8d7737e-3583-417b-a2c1-a93c5e2b32e1,
  abstract     = {{<p>The perovskite-inspired Cu<sub>2</sub>AgBiI<sub>6</sub> (CABI) material has been gaining increasing momentum as photovoltaic (PV) absorber due to its low toxicity, intrinsic air stability, direct bandgap, and a high absorption coefficient in the range of 10<sup>5</sup> cm<sup>−1</sup>. However, the power conversion efficiency (PCE) of existing CABI-based PVs is still seriously constrained by the presence of both intrinsic and surface defects. Herein, antimony (III) (Sb<sup>3+</sup>) is introduced into the octahedral lattice sites of the CABI structure, leading to CABI-Sb with larger crystalline domains than CABI. The alloying of Sb<sup>3+</sup> with bismuth (III) (Bi<sup>3+</sup>) induces changes in the local structural symmetry that dramatically increase the formation energy of intrinsic defects. Light-intensity dependence and electron impedance spectroscopic studies show reduced trap-assisted recombination in the CABI-Sb PV devices. CABI-Sb solar cells feature a nearly 40% PCE enhancement (from 1.31% to 1.82%) with respect to the CABI devices mainly due to improvement in short-circuit current density. This work will promote future compositional design studies to enhance the intrinsic defect tolerance of next-generation wide-bandgap absorbers for high-performance and stable PVs.</p>}},
  author       = {{Al-Anesi, Basheer and Grandhi, G. Krishnamurthy and Pecoraro, Adriana and Sugathan, Vipinraj and Viswanath, Noolu Srinivasa Manikanta and Ali-Löytty, Harri and Liu, Maning and Ruoko, Tero Petri and Lahtonen, Kimmo and Manna, Debjit and Toikkonen, Sami and Muñoz-García, Ana Belén and Pavone, Michele and Vivo, Paola}},
  issn         = {{1613-6810}},
  keywords     = {{defects; low-toxicity; perovskite-inspired material; photovoltaics; wide-bandgap}},
  language     = {{eng}},
  number       = {{46}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Small}},
  title        = {{Antimony-Bismuth Alloying : The Key to a Major Boost in the Efficiency of Lead-Free Perovskite-Inspired Photovoltaics}},
  url          = {{http://dx.doi.org/10.1002/smll.202303575}},
  doi          = {{10.1002/smll.202303575}},
  volume       = {{19}},
  year         = {{2023}},
}