Antimony-Bismuth Alloying : The Key to a Major Boost in the Efficiency of Lead-Free Perovskite-Inspired Photovoltaics
(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.
(Less)
- author
- publishing date
- 2023
- 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}}, }