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Ground- And excited-state characteristics in photovoltaic polymer N2200

Wen, Guanzhao ; Zou, Xianshao LU ; Hu, Rong ; Peng, Jun ; Chen, Zhifeng ; He, Xiaochuan ; Dong, Geng LU and Zhang, Wei LU (2021) In RSC Advances 11(33). p.20191-20199
Abstract

As a classical polymer acceptor material, N2200 has received extensive attention and research in the field of polymer solar cells (PSCs). However, the intrinsic properties of ground- and excited-states in N2200, which are critical for the application of N2200 in PSCs, remain poorly understood. In this work, the ground- and excited-state properties of N2200 solution and film were studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory (TD-DFT) calculations. The transition mechanism of absorption peaks of N2200 was evaluated through the natural transition orbitals (NTOs) and hole-electron population analysis by TD-DFT. Time-resolved photoluminescence (TRPL) study shows that the... (More)

As a classical polymer acceptor material, N2200 has received extensive attention and research in the field of polymer solar cells (PSCs). However, the intrinsic properties of ground- and excited-states in N2200, which are critical for the application of N2200 in PSCs, remain poorly understood. In this work, the ground- and excited-state properties of N2200 solution and film were studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory (TD-DFT) calculations. The transition mechanism of absorption peaks of N2200 was evaluated through the natural transition orbitals (NTOs) and hole-electron population analysis by TD-DFT. Time-resolved photoluminescence (TRPL) study shows that the lifetimes of singlet excitons in N2200 chlorobenzene solution and film are ∼90 ps and ∼60 ps, respectively. Considering the absolute quantum yield of N2200 film, we deduce that the intrinsic lifetime of singlet exciton can be as long as ∼20 ns. By comparing the TRPL and transient absorption (TA) kinetics, we find that the decay of singlet excitons in N2200 solution is dominated by a fast non-radiative decay process, and the component induced by intersystem crossing is less than 5%. Besides that, the annihilation radius, annihilation rate and diffusion length of singlet excitons in N2200 film were evaluated as 3.6 nm, 2.5 × 10−9cm3s−1and 4.5 nm, respectively. Our work provides comprehensive information on the excited states of N2200, which is helpful for the application of N2200 in all-PSCs.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
RSC Advances
volume
11
issue
33
pages
9 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85108252966
  • pmid:35479889
ISSN
2046-2069
DOI
10.1039/d1ra01474a
language
English
LU publication?
yes
id
79967236-f300-461c-ae05-e4fc9b7b8d49
date added to LUP
2021-07-15 14:22:57
date last changed
2024-06-15 13:31:31
@article{79967236-f300-461c-ae05-e4fc9b7b8d49,
  abstract     = {{<p>As a classical polymer acceptor material, N2200 has received extensive attention and research in the field of polymer solar cells (PSCs). However, the intrinsic properties of ground- and excited-states in N2200, which are critical for the application of N2200 in PSCs, remain poorly understood. In this work, the ground- and excited-state properties of N2200 solution and film were studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory (TD-DFT) calculations. The transition mechanism of absorption peaks of N2200 was evaluated through the natural transition orbitals (NTOs) and hole-electron population analysis by TD-DFT. Time-resolved photoluminescence (TRPL) study shows that the lifetimes of singlet excitons in N2200 chlorobenzene solution and film are ∼90 ps and ∼60 ps, respectively. Considering the absolute quantum yield of N2200 film, we deduce that the intrinsic lifetime of singlet exciton can be as long as ∼20 ns. By comparing the TRPL and transient absorption (TA) kinetics, we find that the decay of singlet excitons in N2200 solution is dominated by a fast non-radiative decay process, and the component induced by intersystem crossing is less than 5%. Besides that, the annihilation radius, annihilation rate and diffusion length of singlet excitons in N2200 film were evaluated as 3.6 nm, 2.5 × 10<sup>−9</sup>cm<sup>3</sup>s<sup>−1</sup>and 4.5 nm, respectively. Our work provides comprehensive information on the excited states of N2200, which is helpful for the application of N2200 in all-PSCs.</p>}},
  author       = {{Wen, Guanzhao and Zou, Xianshao and Hu, Rong and Peng, Jun and Chen, Zhifeng and He, Xiaochuan and Dong, Geng and Zhang, Wei}},
  issn         = {{2046-2069}},
  language     = {{eng}},
  number       = {{33}},
  pages        = {{20191--20199}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{RSC Advances}},
  title        = {{Ground- And excited-state characteristics in photovoltaic polymer N2200}},
  url          = {{http://dx.doi.org/10.1039/d1ra01474a}},
  doi          = {{10.1039/d1ra01474a}},
  volume       = {{11}},
  year         = {{2021}},
}