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Reducing energy loss via tuning energy levels of polymer acceptors for efficient all-polymer solar cells

Sun, Huiliang ; Liu, Bin ; Yu, Jianwei ; Zou, Xianshao LU ; Zhang, Guangye ; Zhang, Yujie ; Zhang, Wei LU ; Su, Mengyao ; Fan, Qunping and Yang, Kun , et al. (2020) In Science China Chemistry 63(12). p.1785-1792
Abstract

The open-circuit voltage (Voc) of all-polymer solar cells (all-PSCs) is typically lower than 0.9 V even for the most efficient ones. Large energy loss is the main reason for limiting Voc and efficiency of all-PSCs. Herein, through materials design using electron deficient building blocks based on bithiophene imides, the lowest unoccupied molecular orbital (LUMO) energy levels of polymer acceptors can be effectively tuned, which resulted in a reduced energy loss induced by charge generation and recombination loss due to the suppressed charge-transfer (CT) state absorption. Despite a negligible driving force, all-PSC based on the polymer donor and acceptor combination with well-aligned energy levels exhibited... (More)

The open-circuit voltage (Voc) of all-polymer solar cells (all-PSCs) is typically lower than 0.9 V even for the most efficient ones. Large energy loss is the main reason for limiting Voc and efficiency of all-PSCs. Herein, through materials design using electron deficient building blocks based on bithiophene imides, the lowest unoccupied molecular orbital (LUMO) energy levels of polymer acceptors can be effectively tuned, which resulted in a reduced energy loss induced by charge generation and recombination loss due to the suppressed charge-transfer (CT) state absorption. Despite a negligible driving force, all-PSC based on the polymer donor and acceptor combination with well-aligned energy levels exhibited efficient charge transfer and achieved an external quantum efficiency over 10% while maintaining a large Voc of 1.02 V, leading to a 9.21% efficiency. Through various spectroscopy approaches, this work sheds light on the mechanism of energy loss in all-PSCs, which paves an avenue to achieving efficient all-PSCs with large Voc and drives the further development of all-PSCs.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
all-polymer solar cells, energy level modulation, energy loss, photovoltage, polymer acceptors
in
Science China Chemistry
volume
63
issue
12
pages
8 pages
publisher
Science in China Press
external identifiers
  • scopus:85088844494
ISSN
1674-7291
DOI
10.1007/s11426-020-9826-4
language
English
LU publication?
yes
id
f76e286b-e478-43e4-8161-2bab301c9a36
date added to LUP
2020-08-11 09:01:41
date last changed
2023-11-20 09:15:26
@article{f76e286b-e478-43e4-8161-2bab301c9a36,
  abstract     = {{<p>The open-circuit voltage (V<sub>oc</sub>) of all-polymer solar cells (all-PSCs) is typically lower than 0.9 V even for the most efficient ones. Large energy loss is the main reason for limiting V<sub>oc</sub> and efficiency of all-PSCs. Herein, through materials design using electron deficient building blocks based on bithiophene imides, the lowest unoccupied molecular orbital (LUMO) energy levels of polymer acceptors can be effectively tuned, which resulted in a reduced energy loss induced by charge generation and recombination loss due to the suppressed charge-transfer (CT) state absorption. Despite a negligible driving force, all-PSC based on the polymer donor and acceptor combination with well-aligned energy levels exhibited efficient charge transfer and achieved an external quantum efficiency over 10% while maintaining a large V<sub>oc</sub> of 1.02 V, leading to a 9.21% efficiency. Through various spectroscopy approaches, this work sheds light on the mechanism of energy loss in all-PSCs, which paves an avenue to achieving efficient all-PSCs with large V<sub>oc</sub> and drives the further development of all-PSCs.</p>}},
  author       = {{Sun, Huiliang and Liu, Bin and Yu, Jianwei and Zou, Xianshao and Zhang, Guangye and Zhang, Yujie and Zhang, Wei and Su, Mengyao and Fan, Qunping and Yang, Kun and Chen, Jianhua and Yan, He and Gao, Feng and Guo, Xugang}},
  issn         = {{1674-7291}},
  keywords     = {{all-polymer solar cells; energy level modulation; energy loss; photovoltage; polymer acceptors}},
  language     = {{eng}},
  number       = {{12}},
  pages        = {{1785--1792}},
  publisher    = {{Science in China Press}},
  series       = {{Science China Chemistry}},
  title        = {{Reducing energy loss via tuning energy levels of polymer acceptors for efficient all-polymer solar cells}},
  url          = {{http://dx.doi.org/10.1007/s11426-020-9826-4}},
  doi          = {{10.1007/s11426-020-9826-4}},
  volume       = {{63}},
  year         = {{2020}},
}