Syntheses and Properties of Semiconducting Polymers Based on Pyrimidine Series Substituted with Thiazolo-Pyridine

For the utilization in the polymer solar cells, conjugated polymers were synthesized using electron-deficient units, 2-{3-[4,6-bis-(4-hexyl-thiophen-2-yl)-pyrimidin-2-yl]-phenyl}-thiazolo[5,4- b ]pyridine ( mTP ) or 2-{4-[4,6-bis-(4-hexylthiophen-2-yl)-pyrimidin-2-yl]-phenyl}-thiazolo[5,4- b ]pyridi...

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Bibliographic Details
Published in:Macromolecular research 2018, 26(5), , pp.438-445
Main Authors: Kim, Juae, Chae, Sangmin, Yi, Ahra, Kim, Minji, Kim, Hyo Jung, Suh, Hongsuk
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Charge transfer
Chemical synthesis
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Electrons
Energy conversion efficiency
Energy levels
Molecular chains
Molecular orbitals
Nanochemistry
Nanotechnology
Open circuit voltage
Photovoltaic cells
Physical Chemistry
Polymer Sciences
Polymers
Short circuits
Soft and Granular Matter
Solar cells
고분자공학
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Summary:For the utilization in the polymer solar cells, conjugated polymers were synthesized using electron-deficient units, 2-{3-[4,6-bis-(4-hexyl-thiophen-2-yl)-pyrimidin-2-yl]-phenyl}-thiazolo[5,4- b ]pyridine ( mTP ) or 2-{4-[4,6-bis-(4-hexylthiophen-2-yl)-pyrimidin-2-yl]-phenyl}-thiazolo[5,4- b ]pyridine ( pTP ). To increase the electron-deficiency of the pyrimidine unit, thiazolopyridine ( TP ), strong electron-withdrawing group, was incorporated at the meta-/para-position of the phenylene connector which is attached to the pyrimidine. It was confirmed that the TP unit at para-position has stronger intramolecular charge transfer (ICT) effect to shift the absorption to the longer wavelength region and deepens the highest occupied molecular orbital (HOMO) energy level. The polymers with 4-(1-octylnonyl)-6-(2-thienyl)-4 H -thieno[3,2,- b ]indole (TTI) having the decent solubility for the morphology show the superior open-circuit voltage ( V OC ) value of the mTTI/pTTI devices compared to the others. Also, the polymers with TTI show increased short-circuit current ( J SC ), fill factor (FF), and power conversion efficiency (PCE) due to high face-on populations.
ISSN:1598-5032
2092-7673
DOI:10.1007/s13233-018-6063-7