Doping Engineering Enables Highly Conductive and Thermally Stable n-Type Organic Thermoelectrics with High Power FactorLiu, 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.
Research output: Contribution to journal › Article › Academic › peer-review
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.
|Number of pages||15|
|Journal||ACS Applied Energy Materials|
|Publication status||Published - Sep-2019|
- doping engineering, electrical conductivity, power factor, thermal stability, fullerene derivative, POLYMER, EFFICIENCY, TRANSPORT, FILMS