Publication date: 21st July 2025
In line with the principles of Safe and Sustainable by Design (SSbD) framework, the development of organic semiconductors must consider not only performance, but also factors such as human and environmental safety, resource efficiency, and circularity. Typically, organic semiconductors are processed from harmful solvents while substrates such as glass, plastic, and more recently natural materials such as cellulose are used as mechanical support, which has implication for how these materials are designed regarding processability and recoverability. Ideally, organic semiconductors are designed to be water-processable to enable benign fabrication methods and form intimate mixtures or composites with cellulosic materials. Additionally, these materials must maintain mechanical integrity and resist degradation or delamination under aqueous conditions during use. Furthermore, to separate the various device components at end-of-life, ideally the design of the organic semiconductor allows for chemical recycling that enables recovering of the separate components.
We have demonstrated that incorporating physical crosslinking moieties into polar polythiophenes enhances their structural robustness while retaining their processability.(1) Our more recent work focuses on the functionalization of these polymers with carboxylate groups(2) that offer water-processability and improved compatibility with cellulose derivatives, supports the creation of stable hybrid materials, and enables recovery of individual components at end-of-life. In this talk, we will present several aspects of these carboxylate-functionalized polythiophenes, such as their stability, use in electroactive cellulose composites, recoverability and their interaction with molecular oxygen under aqueous conditions.
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