Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 9, Pages 9126-9132Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c01511
Keywords
thermoelectrics; PEDOT:PSS; doping; stability; PEIE
Funding
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSRCRG2018-3737]
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In recent years, most of the works on p-type organic thermoelectrics have focused on improving the thermoelectric properties of poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (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 an 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. PETE reduces the evaporation of HNO3 from PEDOT:PSS and increases the power factor from 72 to 168 mu W m(-1) K-1. After a week of exposure to air, the films show a power factor of 124 mu W m(-1) K-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.
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