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Dithienobenzothiadiazole-based conjugated polymer: processing solvent-relied interchain aggregation and device
Jun Huang1, Yongxiang Zhu, Junwu Chen
1Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, 510640, China.
Macromolecular Rapid Communications
|October 7, 2014
Summary
Processing conjugated polymers from solvents with lower solvation ability enhances interchain aggregation. This "wet control" method improves performance in optoelectronic devices like polymer solar cells.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- Conjugated polymers are crucial for organic electronics.
- Controlling polymer aggregation during processing impacts device performance.
- DTfBT-Th(3) is a novel conjugated polymer with potential optoelectronic applications.
Purpose of the Study:
- To investigate the effect of solvent solvation ability on the processing and performance of DTfBT-Th(3).
- To explore the relationship between polymer aggregation and optoelectronic properties.
- To optimize solution processing for enhanced device efficiency.
Main Methods:
- Synthesis of DTfBT-Th(3) polymer.
- Solution processing of the polymer from hot chlorobenzene (CB) and o-dichlorobenzene (DCB).
- Fabrication and characterization of field-effect transistors (FETs) and polymer solar cells (PSCs).
Main Results:
- DTfBT-Th(3) exhibits poor solubility at room temperature but can be processed from hot CB and DCB.
- Processing from hot CB, a solvent with lower solvation ability, preserves interchain aggregation.
- FETs fabricated from hot CB solution show higher hole mobility (0.55 cm²/Vs) compared to hot DCB (0.16 cm²/Vs).
- PSCs fabricated from hot CB achieve higher power conversion efficiencies (5.37–6.67%) than those from hot DCB (up to 5.07%).
Conclusions:
- Lower solvation ability solvents act as a 'wet control' to maintain polymer aggregation during solution processing.
- Preserving interchain aggregation is beneficial for improving charge transport and efficiency in DTfBT-Th(3)-based devices.
- This processing strategy holds significant potential for advancing conjugated polymer-based optoelectronics.
Keywords:
D-A conjugated copolymersdithienobenzothiadiazolesorganic field-effect transistorspolymer solar cellssalvation ability
