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N-Doping Donor-Dilute Semitransparent Organic Solar Cells to Weaken Donor : Acceptor Miscibility and Consolidate Donor-Phase Continuity

Xie, Jiaqi ; Lin, Weihua LU ; Zheng, Kaibo LU and Liang, Ziqi (2024) In Advanced Science 11(31).
Abstract

Lightweight and semi-transparent organic solar cells (ST-OSCs) offer bright promise for applications such as building integrated photovoltaics. Diluting donor content in bulk-heterojunction active layers to allow greater visible light transmittance (AVT) effectively enhances device transparency, yet the ineluctable compromise of the donor-phase continuity is challenging for efficient charge transport. Herein, a trace amount of n-type N-DMBI dopant is incorporated, which facilitates the donor:acceptor (D:A) de-mixing by strengthening both acceptor polarity and D/A crystallization. With the diminution of component inter-mixing, the limited number of donors increasingly self-aggregate to establish the more continuous phases. For the... (More)

Lightweight and semi-transparent organic solar cells (ST-OSCs) offer bright promise for applications such as building integrated photovoltaics. Diluting donor content in bulk-heterojunction active layers to allow greater visible light transmittance (AVT) effectively enhances device transparency, yet the ineluctable compromise of the donor-phase continuity is challenging for efficient charge transport. Herein, a trace amount of n-type N-DMBI dopant is incorporated, which facilitates the donor:acceptor (D:A) de-mixing by strengthening both acceptor polarity and D/A crystallization. With the diminution of component inter-mixing, the limited number of donors increasingly self-aggregate to establish the more continuous phases. For the benchmark PM6:Y6-based ST-OSCs, when the donor content is reduced from regular 45 to optimal 30 wt.%, the device AVT is remarkably raised by more than a quarter, accompanied by a marginal drop in power conversion efficiency from 13.89% to 13.03%. This study reveals that by decreasing the donor content to <30 wt%, acceptor excitons induced by Förster resonance energy transfer are prone to severe radiative recombination. This is nonetheless mitigated by dopant inclusion within the acceptor phase by providing extra energy offset and prolonging charge transfer state lifetime to assist exciton dissociation.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
donor dilute, hole transport, n-doping, phase continuity and miscibility, semitransparent organic solar cells
in
Advanced Science
volume
11
issue
31
article number
2404135
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85196005332
  • pmid:38884284
ISSN
2198-3844
DOI
10.1002/advs.202404135
language
English
LU publication?
yes
id
e92c5854-36c7-4f0f-946d-92368e9158d8
date added to LUP
2024-09-09 10:38:10
date last changed
2024-09-23 13:12:57
@article{e92c5854-36c7-4f0f-946d-92368e9158d8,
  abstract     = {{<p>Lightweight and semi-transparent organic solar cells (ST-OSCs) offer bright promise for applications such as building integrated photovoltaics. Diluting donor content in bulk-heterojunction active layers to allow greater visible light transmittance (AVT) effectively enhances device transparency, yet the ineluctable compromise of the donor-phase continuity is challenging for efficient charge transport. Herein, a trace amount of n-type N-DMBI dopant is incorporated, which facilitates the donor:acceptor (D:A) de-mixing by strengthening both acceptor polarity and D/A crystallization. With the diminution of component inter-mixing, the limited number of donors increasingly self-aggregate to establish the more continuous phases. For the benchmark PM6:Y6-based ST-OSCs, when the donor content is reduced from regular 45 to optimal 30 wt.%, the device AVT is remarkably raised by more than a quarter, accompanied by a marginal drop in power conversion efficiency from 13.89% to 13.03%. This study reveals that by decreasing the donor content to &lt;30 wt%, acceptor excitons induced by Förster resonance energy transfer are prone to severe radiative recombination. This is nonetheless mitigated by dopant inclusion within the acceptor phase by providing extra energy offset and prolonging charge transfer state lifetime to assist exciton dissociation.</p>}},
  author       = {{Xie, Jiaqi and Lin, Weihua and Zheng, Kaibo and Liang, Ziqi}},
  issn         = {{2198-3844}},
  keywords     = {{donor dilute; hole transport; n-doping; phase continuity and miscibility; semitransparent organic solar cells}},
  language     = {{eng}},
  month        = {{08}},
  number       = {{31}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Advanced Science}},
  title        = {{N-Doping Donor-Dilute Semitransparent Organic Solar Cells to Weaken Donor : Acceptor Miscibility and Consolidate Donor-Phase Continuity}},
  url          = {{http://dx.doi.org/10.1002/advs.202404135}},
  doi          = {{10.1002/advs.202404135}},
  volume       = {{11}},
  year         = {{2024}},
}