In Situ Optical Spectroscopy Demonstrates the Effect of Solvent Additive in the Formation of All-Polymer Solar Cells
Journal article, 2022
1-Chloronaphthalene (CN) has been a common solvent additive in both fullerene- A nd nonfullerene-based organic solar cells. In spite of this, its working mechanism is seldom investigated, in particular, during the drying process of bulk heterojunctions composed of a donor:acceptor mixture. In this work, the role of CN in all-polymer solar cells is investigated by in situ spectroscopies and ex situ characterization of blade-coated PBDB-T:PF5-Y5 blends. Our results suggest that the added CN promotes self-aggregation of polymer donor PBDB-T during the drying process of the blend film, resulting in enhanced crystallinity and hole mobility, which contribute to the increased fill factor and improved performance of PBDB-T:PF5-Y5 solar cells. Besides, the nonradiative energy loss of the corresponding device is also reduced by the addition of CN, corresponding to a slightly increased open-circuit voltage. Overall, our observations deepen our understanding of the drying dynamics, which may guide further development of all-polymer solar cells.
Author
Yanfeng Liu
Linköping University
Jiaxing University
Qunping Fan
Xi'an Jiaotong University
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Heng Liu
Chinese University of Hong Kong
Ishita Jalan
Karlstad University
Yingzhi Jin
Jiaxing University
Jan van Stam
Karlstad University
Ellen Moons
Karlstad University
Ergang Wang
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Xinhui Lu
Chinese University of Hong Kong
O.W. Inganäs
Linköping University
Fengling Zhang
Linköping University
Journal of Physical Chemistry Letters
1948-7185 (eISSN)
11696-11702Subject Categories
Polymer Chemistry
Physical Chemistry
Polymer Technologies
Atom and Molecular Physics and Optics
Textile, Rubber and Polymeric Materials
DOI
10.1021/acs.jpclett.2c03397
PubMed
36512444