Doping Engineering Enables Highly Conductive and Thermally Stable n-Type Organic Thermoelectrics with High Power Factor

Liu, J., Garman, M. P., Dong, J., van der Zee, B., Qiu, L., Portale, G., Hummelen, J. C. & Koster, L. J. A., Sep-2019, In : ACS Applied Energy Materials. 2, 9, p. 6664-6671 15 p.

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This work exploits the scope of doping engineering as an enabler for better-performing and thermally stable n-type organic thermoelectrics. A fullerene derivative with polar triethylene glycol type side chain (PTEG-1) is doped either by "coprocessing doping" with n-type dopants such as n-DMBI and TBAF or by "sequential doping" through thermal deposition of Cs2CO3. Solid-state diffusion of Cs2CO3 appears to dope PTEG-1 in the strongest manner, leading to the highest electrical conductivity of similar to 17.5 S/cm and power factor of 32 mu W/(m K-2). Moreover, the behavior of differently doped PTEG-1 films under thermal stress is examined by electric and spectroscopic means. Cs2CO3-doped films are most stable, likely due to a coordinating interaction between the polar side chain and Cs+-based species, which immobilizes the dopant. The high power factor and good thermal stability of Cs2CO3-doped PTEG-1 make it very promising for tangible thermoelectric applications.

Original languageEnglish
Pages (from-to)6664-6671
Number of pages15
JournalACS Applied Energy Materials
Issue number9
Publication statusPublished - Sep-2019


  • doping engineering, electrical conductivity, power factor, thermal stability, fullerene derivative, POLYMER, EFFICIENCY, TRANSPORT, FILMS

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