Abstract
We describe the synthesis of electron acceptors consisting of bithiazolidinylidene (BT) derivatives incorporated into solution processible polymers. Novel BT-containing polymers displayed p-doping behavior when in contact with the n-type transition metal dichalcogenide (TMDC) MoS2. A work function (WF) increase of MoS2, resulting from contact with BT polymers, was measured by Kelvin probe force microscopy (KPFM), representing the first example of polymer p-doping of MoS2, which is beneficial for advancing the design of electronically tailored TMDCs.
Highlights
To date, reported examples of electron donating materials that decrease the work function of transition metal dichalcogenide (TMDC) (n-doping) are much more common than electron acceptors that increase the transition metal dichalcogenides (TMDCs) work function (p-doping)
To access the full range of TMDC electronics, we focus our efforts on p-doping by noncovalent physisorption without disturbing the inherent TMDC structure
The facile accessibility of hydroxyethyl BT 1a allowed its multi-gram scale synthesis and prompted our attempt to incorporate it into polyurethanes
Summary
To date, reported examples of electron donating materials that decrease the work function of TMDCs (n-doping) are much more common than electron acceptors that increase the TMDC work function (p-doping). We sought to broaden the scope of BT chemistry by synthesizing BT derivatives capable of polymerization and subsequent solution processing as p-dopant coatings on TMDCs. We employed this one-step approach to yield difunctional BT monomers setup for integration into polymers by step-growth polymerization.
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