Dual-Engineered DPP Polymers: Synergistic Hydrogen Bonding and Ring-Fusion for High-Mobility Organic Field-Effect...

Area of Science:

• Materials Science
• Organic Electronics
• Polymer Chemistry

Background:

• Optimizing charge transport mobility is crucial for high-performance organic semiconductors.
• Developing simple and effective molecular design strategies is a key challenge.

Purpose of the Study:

• To design and synthesize a novel diketopyrrolopyrrole (DPP)-based polymer integrating hydrogen bonding (H-B) and ring-fusion (R-F).
• To investigate the synergistic effects of H-B and R-F on charge transport and electronic properties.

Main Methods:

• Synthesis of a novel polymer (P-HF) incorporating both H-B and R-F, alongside a reference polymer (P-B) and a hydrogen-bonded analogue (P-H).
• Characterization of molecular packing, π-π stacking, backbone planarity, and frontier orbital levels.

Main Results:

• The P-HF polymer exhibited significantly enhanced inter- and intramolecular charge transport compared to P-B and P-H.
• P-HF achieved a high hole mobility of 5.02 cm² V⁻¹ s⁻¹, outperforming P-B (0.71 cm² V⁻¹ s⁻¹) and P-H (2.13 cm² V⁻¹ s⁻¹).
• The combination of H-B and R-F optimized frontier orbital levels and π-conjugation.

Conclusions:

• The synergistic integration of R-F and H-B is a viable strategy for designing high-mobility organic conjugated materials.
• This dual-engineering approach offers a promising pathway for advancing organic semiconductor development, particularly for π-conjugated polymers.