A thermally activated and highly miscible dopant for n-type organic thermoelectrics.

ABSTRACT: N-doping plays an irreplaceable role in controlling the electron concentration of organic semiconductors thus to improve performance of organic semiconductor devices. However, compared with many mature p-doping methods, n-doping of organic semiconductor is still of challenges. In particular, dopant stability/processability, counterion-semiconductor immiscibility and doping induced microstructure non-uniformity have restricted the application of n-doping in high-performance devices. Here, we report a computer-assisted screening approach to rationally design of a triaminomethane-type dopant, which exhibit extremely high stability and strong hydride donating property due to its thermally activated doping mechanism. This triaminomethane derivative shows excellent counterion-semiconductor miscibility (counter cations stay with the polymer side chains), high doping efficiency and uniformity. By using triaminomethane, we realize a record n-type conductivity of up to 21?S?cm-1 and power factors as high as 51??W?m-1?K-2 even in films with thicknesses over 10 ?m, and we demonstrate the first reported all-polymer thermoelectric generator.

SUBMITTER: Yang CY 

PROVIDER: S-EPMC7335177 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature