Synthesis and Characterization of Diketopyrolopyrrole-based Polymer with Long and Branched Alkyl Side Chains to Improve Polymer Solubility
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The solubility of polymer semiconductors in organic solvents is a key point to enable facile, low-cost, and large-area solution processes in electronics device fabrication with various applications. However, building complex circuits with these materials has been challenging due to variation in device-to-device. In this work, we developed a diketopyrrolopyrrole (DPP)-based polymer incorporating long and branched alkyl side chains to enhance its solubility. The introduction of long and branched side chains to the DPP moieties aimed to improve solubility. It was also expected that positioning the branching point further along the side chains would reduce steric hindrance, thereby enabling the DPP moieties to maintain the π-π interactions and form crystalline structures. The polymer exhibited both high thermal stability and robust intermolecular interactions as well as demonstrated excellent solubility in halogenated organic solvents, including chloroform, chlorobenzene, and o-dichlorobenzene.