In Situ Optical Spectroscopy Demonstrates the Effect of Solvent Additive in the Formation of All-Polymer Solar Cells
Artikel i vetenskaplig tidskrift, 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.
Författare
Yanfeng Liu
Linköpings universitet
Jiaxing University
Qunping Fan
Xi'an Jiaotong University
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Heng Liu
Chinese University of Hong Kong
Ishita Jalan
Karlstads universitet
Yingzhi Jin
Jiaxing University
Jan van Stam
Karlstads universitet
Ellen Moons
Karlstads universitet
Ergang Wang
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Xinhui Lu
Chinese University of Hong Kong
O.W. Inganäs
Linköpings universitet
Fengling Zhang
Linköpings universitet
Journal of Physical Chemistry Letters
1948-7185 (eISSN)
11696-11702Ämneskategorier
Polymerkemi
Fysikalisk kemi
Polymerteknologi
Atom- och molekylfysik och optik
Textil-, gummi- och polymermaterial
DOI
10.1021/acs.jpclett.2c03397
PubMed
36512444