Enhanced Thermoelectric Performance and Lifetime in Acid-Doped PEDOT:PSS Films via Work Function Modification

Abstract
In recent years, most of the work on p-type organic thermoelectrics focus on improving the thermoelectric properties of PEDOT:PSS through a sequential doping-dedoping process. However, the air-stability of thermoelectric parameters of these systems, which is essential for the realization of reliable devices remains largely unexplored. In this study, Poly (ethyleneimine)-ethoxylate (PEIE) acts as a work function modification agent and encapsulation layer to improve the thermoelectric performance and air-stability of nitric acid (HNO3) doped PEDOT:PSS films. The evaporation of HNO3 is responsible for a simultaneous decrease in electrical conductivity and an increase in the Seebeck coefficient leading to the degradation of the power factor. PEIE reduces the evaporation of HNO3 from PEDOT:PSS, and increases the power factor from 72 to 168 μW m-1K-2. After a week of exposure to air, the films show a power factor of 124 μW m-1K-2, retaining 74% of its initial thermoelectric merits. These results underscore the importance of PEIE as a material for enhancing thermoelectric performance and air-stability in the development of polymer-based thermoelectrics.

Citation
Villalva, D. R., Haque, M. A., Nugraha, M., & Baran, D. (2020). Enhanced Thermoelectric Performance and Lifetime in Acid-Doped PEDOT:PSS Films via Work Function Modification. ACS Applied Energy Materials. doi:10.1021/acsaem.0c01511

Publisher
American Chemical Society (ACS)

Journal
ACS Applied Energy Materials

DOI
10.1021/acsaem.0c01511

Additional Links
https://pubs.acs.org/doi/10.1021/acsaem.0c01511

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