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Halogen-Bonded Hole-Transport Material Suppresses Charge Recombination and Enhances Stability of Perovskite Solar Cells

Canil, Laura ; Salunke, Jagadish ; Wang, Qiong ; Liu, Maning LU orcid ; Köbler, Hans ; Flatken, Marion ; Gregori, Luca ; Meggiolaro, Daniele ; Ricciarelli, Damiano and De Angelis, Filippo , et al. (2021) In Advanced Energy Materials 11(35).
Abstract

Interfaces play a crucial role in determining perovskite solar cells, (PSCs) performance and stability. It is therefore of great importance to constantly work toward improving their design. This study shows the advantages of using a hole-transport material (HTM) that can anchor to the perovskite surface through halogen bonding (XB). A halo-functional HTM (PFI) is compared to a reference HTM (PF), identical in optoelectronic properties and chemical structure but lacking the ability to form XB. The interaction between PFI and perovskite is supported by simulations and experiments. XB allows the HTM to create an ordered and homogenous layer on the perovskite surface, thus improving the perovskite/HTM interface and its energy level... (More)

Interfaces play a crucial role in determining perovskite solar cells, (PSCs) performance and stability. It is therefore of great importance to constantly work toward improving their design. This study shows the advantages of using a hole-transport material (HTM) that can anchor to the perovskite surface through halogen bonding (XB). A halo-functional HTM (PFI) is compared to a reference HTM (PF), identical in optoelectronic properties and chemical structure but lacking the ability to form XB. The interaction between PFI and perovskite is supported by simulations and experiments. XB allows the HTM to create an ordered and homogenous layer on the perovskite surface, thus improving the perovskite/HTM interface and its energy level alignment. Thanks to the compact and ordered interface, PFI displays increased resistance to solvent exposure compared to its not-interacting counterpart. Moreover, PFI devices show suppressed nonradiative recombination and reduced hysteresis, with a Voc enhancement of ≥20 mV and a remarkable stability, retaining more than 90% efficiency after 550 h of continuous maximum-power-point tracking. This work highlights the potential that XB can bring to the context of PSCs, paving the way for a new halo-functional design strategy for charge-transport layers, which tackles the challenges of charge transport and interface improvement simultaneously.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
halogen bonding, hole-transport materials, interfaces, perovskite solar cells
in
Advanced Energy Materials
volume
11
issue
35
article number
2101553
publisher
Wiley-Blackwell
external identifiers
  • scopus:85112596212
ISSN
1614-6832
DOI
10.1002/aenm.202101553
language
English
LU publication?
no
id
4adc3f12-1327-44e7-b2f6-84214a26e166
date added to LUP
2023-08-24 12:25:34
date last changed
2023-08-25 14:21:24
@article{4adc3f12-1327-44e7-b2f6-84214a26e166,
  abstract     = {{<p>Interfaces play a crucial role in determining perovskite solar cells, (PSCs) performance and stability. It is therefore of great importance to constantly work toward improving their design. This study shows the advantages of using a hole-transport material (HTM) that can anchor to the perovskite surface through halogen bonding (XB). A halo-functional HTM (PFI) is compared to a reference HTM (PF), identical in optoelectronic properties and chemical structure but lacking the ability to form XB. The interaction between PFI and perovskite is supported by simulations and experiments. XB allows the HTM to create an ordered and homogenous layer on the perovskite surface, thus improving the perovskite/HTM interface and its energy level alignment. Thanks to the compact and ordered interface, PFI displays increased resistance to solvent exposure compared to its not-interacting counterpart. Moreover, PFI devices show suppressed nonradiative recombination and reduced hysteresis, with a V<sub>oc</sub> enhancement of ≥20 mV and a remarkable stability, retaining more than 90% efficiency after 550 h of continuous maximum-power-point tracking. This work highlights the potential that XB can bring to the context of PSCs, paving the way for a new halo-functional design strategy for charge-transport layers, which tackles the challenges of charge transport and interface improvement simultaneously.</p>}},
  author       = {{Canil, Laura and Salunke, Jagadish and Wang, Qiong and Liu, Maning and Köbler, Hans and Flatken, Marion and Gregori, Luca and Meggiolaro, Daniele and Ricciarelli, Damiano and De Angelis, Filippo and Stolterfoht, Martin and Neher, Dieter and Priimagi, Arri and Vivo, Paola and Abate, Antonio}},
  issn         = {{1614-6832}},
  keywords     = {{halogen bonding; hole-transport materials; interfaces; perovskite solar cells}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{35}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Advanced Energy Materials}},
  title        = {{Halogen-Bonded Hole-Transport Material Suppresses Charge Recombination and Enhances Stability of Perovskite Solar Cells}},
  url          = {{http://dx.doi.org/10.1002/aenm.202101553}},
  doi          = {{10.1002/aenm.202101553}},
  volume       = {{11}},
  year         = {{2021}},
}