Performance optimization strategy for organic thermoelectric devices by controlling the Bronsted Lowry acid functional group
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초록
내용
In this presentation, the difference in doping efficiency between molecular doping and Brønsted–Lowry acid doping using indolo [3,2-b] indole-based conjugated polymers (CPs) was compared and analyzed. In general p type molecular doping, the LUMO level of the dopant must be deeper than the CPs HOMO level for efficient charge transfer to occur. While p type doping of CPs using Brønsted–Lowry acid, doping can be done by protonation of lone pair electron even if these energy levels do not match. The acidity of the acid dopant was controlled by varying the functional group at the para position of benzene sulfonic acid, and the stronger the electron withdrawing ability, the better the doping efficiency. Finally, the thermoelectric power factor optimized by adjusting the highest acidity of benzene sulfonic acid was up to 20.4 μW·m-1·K2