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  4. Metal–Ligand Based Mechanophores Enhance Both Mechanical Robustness and Electronic Performance of Polymer Semiconductors
 
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Metal–Ligand Based Mechanophores Enhance Both Mechanical Robustness and Electronic Performance of Polymer Semiconductors

Publikationstyp
Journal Article
Date Issued
2021-03-11
Sprache
English
Author(s)
Wu, Hung Chin  
Lissel, Franziska  
Wang, Ging Ji Nathan  
Koshy, David M.  
Nikzad, Shayla  
Yan, Hongping  
Xu, Jie  
Luo, Shaochuan  
Matsuhisa, Naoji  
Cheng, Yuan  
Wang, Fan  
Ji, Baohua  
Li, Dechang  
Chen, Wen Chang  
Xue, Gi  
Bao, Zhenan  
TORE-URI
http://hdl.handle.net/11420/15096
Journal
Advanced functional materials  
Volume
31
Issue
11
Article Number
2009201
Citation
Advanced Functional Materials 31 (11): 2009201 (2021-03-10)
Publisher DOI
10.1002/adfm.202009201
Scopus ID
2-s2.0-85099225257
The backbone of diketopyrrolopyrrole-thiophene-vinylene-thiophene-based polymer semiconductors (PSCs) is modified with pyridine (Py) or bipyridine ligands to complex Fe(II) metal centers, allowing the metal–ligand complexes to act as mechanophores and dynamically crosslink the polymer chains. Mono- and bi-dentate ligands are observed to exhibit different degrees of bond strengths, which subsequently affect the mechanical properties of these Wolf-type-II metallopolymers. The counter ion also plays a crucial role, as it is observed that Py-Fe mechanophores with non-coordinating BPh4– counter ions (Py-FeB) exhibit better thin film ductility with lower elastic modulus, as compared to the coordinating chloro ligands (Py-FeC). Interestingly, besides mechanical robustness, the electrical charge carrier mobility can also be enhanced concurrently when incorporating Py-FeB mechanophores in PSCs. This is a unique observation among stretchable PSCs, especially that most reports to date describe a decreased mobility when the stretchability is improved. Next, it is determined that improvements to both mobility and stretchability are correlated to the solid-state molecular ordering and dynamics of coordination bonds under strain, as elucidated via techniques of grazing-incidence X-ray diffraction and X-ray absorption spectroscopy techniques, respectively. This study provides a viable approach to enhance both the mechanical and the electronic performance of polymer-based soft devices.
Subjects
charge transport
mechanophore
metal-ligand coordination
polymer semiconductor
stretchable electronics
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