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)

Vol. 13 11696-11702

Subject 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

More information

Latest update

7/17/2024