Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Triggering ZT to 0.40 by Engineering Orientation in One Polymeric Semiconductor
Breaking the thermoelectric (TE) trade?off relationship is a dreaming task for maximizing the TE performance of polymeric semiconductors. Existing efforts have focused on designing high?mobility semiconductors and achieving ordered molecular doping, ignoring the critical role of the molecular orientation during TE conversion. Herein, we report the achievement of ZT to 0.40 by fine?tuning the molecular orientation of one diketopyrrolopyrrole?based polymer (DPP?BTz). Films with bimodal molecular orientation yield superior doping efficiency by increasing the lamellar spacing and achieve increased splitting between the Fermi energy and the transport energy to enhance the thermopower. These factors contribute to the simultaneous improvement in the Seebeck coefficient and electrical conductivity in an unexpected manner. Importantly, the bimodal film exhibited a maximum power factor of up to 346 ?W m?1 K?2, >400% higher than that of unimodal films. These results demonstrate the great potential of molecular orientation engineering in polymeric semiconductors for developing state?of?the?art OTE materials.This article is protected by copyright. All rights reserved
» Publication Date: 28/10/2022
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
