Highly conductive PEDOT-based materials for thermoelectric and photovoltaic applications Renaud Demadrille, Magatte N. Gueye, Amélie Schultheiss, Jérôme Faure-Vincent, Stéphanie Pouget, Valid M. Mwalukuku, Alexandre Carella, Jean-Pierre Simonato University of Grenoble, France Pi-conjugated polymers are promising materials for the fabrication of transparent conducting layers in optoelectronics. They have many advantages over inorganic materials, such as low cost, easy deposition by printing techniques and high flexibility [1] . However, their electrical conductivity needs to be improved to meet the requirements of certain applications. In this presentation, we report a simple method for the preparation of poly(3,4-ethylenedioxythiophene) (PEDOT) thin films that show conductivity above 6000 S. cm -1[2-3] . We will show that such an improvement in the conductivity of PEDOT films requires precise control of the water content during the polymerisation step. XRD, HRTEM, synchrotron GIWAXS analyses and conductivity measurements down to 3 K have allowed us to correlate the organisation of these highly conductive polymeric materials to the doping and transport mechanisms. We will show that these PEDOT-based materials have good mechanical properties and remarkably high stability [4] . Finally, we will report on their use in the fabrication of thermoelectric devices [5] , transparent all-polymer heating films [6] and solar cells. References 1. Prog. Mater. Sci., 2020, 100616.
2. Chem. Mater., 2016, 28, 3462-3468. 3. J. Mater. Chem. C, 2020, 8, 17254. 4. ACS Appl. Polym. Mater. 2021, 3, 11, 5942–5949. 5. Mater. Chem. Front., 2020, 4, 2054. 6. ACS Appl. Mater. Interfaces, 2017, 9, 27250-27256.
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