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Synthesis, photophysical properties and application of DPP dye-based polymer in ambipolar organic field-effect transistors
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DOI：10.1016/j.dyepig.2026.113652.png)
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Abstract
En 中文
Beyond their traditional role as colouring agents, organic dyes and pigments have been recognised as indispensable raw material sources for advanced technological applications, including optoelectronic devices. Herein, a conjugated material based on an alternating donor-acceptor architecture was synthesised via the Stille coupling method and designated PTTDPP-Se-2FT. The target product was purified via Soxhlet extraction, and its high purity was confirmed through elemental analysis. The molecular structure of PTTDPP-Se-2FT was investigated through theoretical calculations, revealing an extremely coplanar configuration, with fragment-tofragment torsion angles within 1 degrees. This high degree of planarity promotes intermolecular it-it stacking, thereby facilitating charge-hopping conduction between molecules. The material exhibits high thermal stability and good solution processability, making it a promising block for semiconductor optoelectronic materials. Furthermore, the photophysical and electrochemical properties of the polymer, along with the microstructure of its thin films, were systematically characterised, and its potential for transistor applications was explored. Device performance was optimised by adjusting the channel length-to-width (L/W) ratio, achieving maximum hole and electron mobilities of 1.18 and 1.02 cm2 V-1 s- 1, respectively. These results may provide valuable insights for the future design of polymers with novel chemical structures.
Keywords:
Conjugated polymer
Coplanar material
Cross-coupling polymerisation
Solvent-processing
High mobility
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