Abstract
Herein, a simple structure, nonchlorinated solvent processable high mobility donor–acceptor conjugated polymer, poly(2,5‐bis(4‐hexyldodecyl)‐2,5‐dihydro‐3,6‐di‐2‐thienyl‐pyrrolo[3,4‐c]pyrrole‐1,4‐dione‐alt‐thiophene) (PDPPT3‐HDO), is reported. The enhanced solubility in nonchlorinated solvent is realized based on a denser alkyl side chains strategy by incorporating small size comonomer thiophene. An associated benefit of thiophene comonomer is the remarkable structural simplicity of the resulting polymer, which is advantageous for industrial scaling up. The alkyl side chain density and structure of PDPPT3‐HDO can efficiently control the self‐assembly properties in solution and film. By bar coating from o‐xylene solution, PDPPT3‐HDO forms aligned films and exhibits high hole mobility of up to 9.24 cm2 V−1 s−1 in organic thin film transistors (OTFTs). Notably, the bar‐coated OTFT based on PDPPT3‐HDO shows a close to ideal transistor model and a high mobility reliability factor of 87%. The multiple benefits of increased side chain density strategy may encourage the design of high mobility polymers that meet the requirements of mass production of OTFT materials and devices.
Highlights
The multiple benefits of increased side chain density strategy may encourage the design of high mobility polymers that meet the requirements of mass production of organic thin film transistors (OTFTs) materials and devices
High mobility conjugated polymers (CPs) for organic thin film prohibits efficient solute–solvent intermolecular interactions transistors (OTFTs) have attracted tremendous academic and poor solubility is often encountered in nonchlorinated industrial attention due to their excellent solution process- solvents.[19,20]
PDPPT3-HDO achieved a high saturation mobility of 9.24 cm2 V−1 s−1 and a linear mobility of 6.90 cm2 V−1 s−1 in parallel direction using the polymer by 25 min polymerization, among the highest mobilities reported for OTFTs processed from nonchlorinated solvents to date.[12,21,37,38]
Summary
By bar coating from o-xylene solution, PDPPT3-HDO forms aligned films and exhibits high hole mobility of up to 9.24 cm2 V−1 s−1 in organic thin film transistors (OTFTs). PDPPT3-HDO achieved a high saturation mobility of 9.24 cm2 V−1 s−1 and a linear mobility of 6.90 cm2 V−1 s−1 in parallel direction using the polymer by 25 min polymerization, among the highest mobilities reported for OTFTs processed from nonchlorinated solvents to date.[12,21,37,38] The performance of PDPPT3-HDO from different batches of 25 min polymerization was investigated by testing the devices along the parallel direction.
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