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Beyond hydrophobicity : how F4-TCNQ doping of the hole transport material improves stability of mesoporous triple-cation perovskite solar cells

Liu, Maning LU orcid ; Dahlström, Staffan ; Ahläng, Christian ; Wilken, Sebastian ; Degterev, Aleksandr ; Matuhina, Anastasia ; Hadadian, Mahboubeh ; Markkanen, Magnus ; Aitola, Kerttu and Kamppinen, Aleksi , et al. (2022) In Journal of Materials Chemistry A 10(21). p.11721-11731
Abstract

Despite the outstanding power conversion efficiency of triple-cation perovskite solar cells (PSCs), their low long-term stability in the air is still a major bottleneck for practical applications. The hygroscopic dopants traditionally used in hole transport materials (HTMs) severely degrade the perovskite film. The p-type F4-TCNQ doping of the well-known spiro-OMeTAD HTM enables hydrophobicity-induced protection of the perovskite layer underneath. Nevertheless, the mechanism of F4-TCNQ doping in stabilizing PSCs is still rather unclear. Herein, when F4-TCNQ was adopted as the sole dopant of spiro-OMeTAD, highly stable mesoporous triple-cation PSCs were developed, with a very long T80 lifetime of more than 1 year (∼380 days)... (More)

Despite the outstanding power conversion efficiency of triple-cation perovskite solar cells (PSCs), their low long-term stability in the air is still a major bottleneck for practical applications. The hygroscopic dopants traditionally used in hole transport materials (HTMs) severely degrade the perovskite film. The p-type F4-TCNQ doping of the well-known spiro-OMeTAD HTM enables hydrophobicity-induced protection of the perovskite layer underneath. Nevertheless, the mechanism of F4-TCNQ doping in stabilizing PSCs is still rather unclear. Herein, when F4-TCNQ was adopted as the sole dopant of spiro-OMeTAD, highly stable mesoporous triple-cation PSCs were developed, with a very long T80 lifetime of more than 1 year (∼380 days) for devices stored in air (RH ∼ 40%). The present comprehensive experimental and theoretical studies on F4-TCNQ-doped spiro-OMeTAD reveal that the hydrophobic protection of the perovskite layer underneath is not the only reason for the increased long-term stability of the devices. The high uniformity of F4-TCNQ doping in the spiro-OMeTAD layer and less dopant aggregation and dopant migration towards the anode are key factors responsible for the increased stability of the perovskite solar cells when compared to conventional hygroscopic dopants. This work paves the way for future doping engineering of HTMs for PSCs with competitive stability.

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type
Contribution to journal
publication status
published
subject
in
Journal of Materials Chemistry A
volume
10
issue
21
pages
11 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85132121462
ISSN
2050-7488
DOI
10.1039/d2ta02588d
language
English
LU publication?
no
id
56d66e5e-c283-483d-b864-4b3e6194058e
date added to LUP
2023-08-24 12:18:35
date last changed
2025-04-04 13:52:21
@article{56d66e5e-c283-483d-b864-4b3e6194058e,
  abstract     = {{<p>Despite the outstanding power conversion efficiency of triple-cation perovskite solar cells (PSCs), their low long-term stability in the air is still a major bottleneck for practical applications. The hygroscopic dopants traditionally used in hole transport materials (HTMs) severely degrade the perovskite film. The p-type F4-TCNQ doping of the well-known spiro-OMeTAD HTM enables hydrophobicity-induced protection of the perovskite layer underneath. Nevertheless, the mechanism of F4-TCNQ doping in stabilizing PSCs is still rather unclear. Herein, when F4-TCNQ was adopted as the sole dopant of spiro-OMeTAD, highly stable mesoporous triple-cation PSCs were developed, with a very long T<sub>80</sub> lifetime of more than 1 year (∼380 days) for devices stored in air (RH ∼ 40%). The present comprehensive experimental and theoretical studies on F4-TCNQ-doped spiro-OMeTAD reveal that the hydrophobic protection of the perovskite layer underneath is not the only reason for the increased long-term stability of the devices. The high uniformity of F4-TCNQ doping in the spiro-OMeTAD layer and less dopant aggregation and dopant migration towards the anode are key factors responsible for the increased stability of the perovskite solar cells when compared to conventional hygroscopic dopants. This work paves the way for future doping engineering of HTMs for PSCs with competitive stability.</p>}},
  author       = {{Liu, Maning and Dahlström, Staffan and Ahläng, Christian and Wilken, Sebastian and Degterev, Aleksandr and Matuhina, Anastasia and Hadadian, Mahboubeh and Markkanen, Magnus and Aitola, Kerttu and Kamppinen, Aleksi and Deska, Jan and Mangs, Oliver and Nyman, Mathias and Lund, Peter D. and Smått, Jan Henrik and Österbacka, Ronald and Vivo, Paola}},
  issn         = {{2050-7488}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{21}},
  pages        = {{11721--11731}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Journal of Materials Chemistry A}},
  title        = {{Beyond hydrophobicity : how F4-TCNQ doping of the hole transport material improves stability of mesoporous triple-cation perovskite solar cells}},
  url          = {{http://dx.doi.org/10.1039/d2ta02588d}},
  doi          = {{10.1039/d2ta02588d}},
  volume       = {{10}},
  year         = {{2022}},
}