Reducing energy loss via tuning energy levels of polymer acceptors for efficient all-polymer solar cells
(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.
(Less)
- author
- organization
- publishing date
- 2020-12
- 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}}, }