Pechmann Dye-Containing Diketopyrrolopyrrole-Based Stretchable Polymer Semiconductors

Area of Science:

• Materials Science
• Polymer Chemistry
• Organic Electronics

Background:

• Conjugated polymer design is crucial for stretchable organic electronics.
• Irregular polymer backbones offer a strategy to balance charge carrier mobility and stretchability.
• Diketopyrrolopyrrole (DPP)-based polymers are promising candidates for these applications.

Purpose of the Study:

• To investigate the impact of incorporating Pechmann dye (PDy) units into DPP-based conjugated polymers.
• To explore how PDy affects the structural, electronic, and mechanical properties of these polymers.
• To evaluate the potential of PDy-based random terpolymerization for enhancing stretchable polymer semiconductors.

Main Methods:

• Synthesis of DPP-based terpolymers with varying PDy content (0%, 5%, 10%).
• Experimental characterization including electrical measurements (hole mobility) and stretchability tests.
• Computational analyses to understand structural and property relationships.

Main Results:

• Hole mobilities ranged from 0.01 to 0.08 cm² V⁻¹ s⁻¹, with a slight decrease upon PDy addition.
• DPP polymers with 5% and 10% PDy (DP-T5, DP-T10) showed significantly improved stretchability due to loosely packed lamellar structures.
• DP-T5 achieved a crack onset strain of 250% and a mobility ratio (μ₂₀₀/μ₀) over 5.

Conclusions:

• Pechmann dye incorporation effectively enhances the mechanical stretchability of DPP-based conjugated polymers.
• This strategy maintains reasonable electronic performance, demonstrating a viable approach for stretchable polymer semiconductors.
• PDy-based random terpolymerization is a promising method for developing advanced organic electronic materials.