Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 47, Pages 53003-53011Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16254
Keywords
conjugated polymers; sequential doping; n-doping; organic thermoelectrics; ladder-type polymers; thermal stability
Funding
- Swedish Research Council [2016-03979]
- AForsk [18-313, 19310]
- Olle Engkvists Stiftelse [204-0256]
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]
- Finnish Cultural Foundation
- Finnish Foundation for Technology Promotion
- Knut and Alice Wallenberg Foundation
- Knut and Alice Wallenberg Foundation [Dnr KAW 2014.0041]
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Doping of organic semiconductors is a powerful tool to optimize the performance of various organic (opto)electronic and bioelectronic devices. Despite recent advances, the low thermal stability of the electronic properties of doped polymers still represents a significant obstacle to implementing these materials into practical applications. Hence, the development of conducting doped polymers with excellent long-term stability at elevated temperatures is highly desirable. Here, we report on the sequential doping of the ladder-type polymer poly-(benzimidazobenzophenanthroline) (BBL) with a benzimidazole-based dopant (i.e., N-DMBI). By combining electrical, UV-vis/infrared, X-ray diffraction, and electron paramagnetic resonance measurements, we quantitatively characterized the conductivity, Seebeck coefficient, spin density, and microstructure of the sequentially doped polymer films as a function of the thermal annealing temperature. Importantly, we observed that the electrical conductivity of N-DMBI-doped BBL remains unchanged even after 20 h of heating at 190 degrees C. This finding is remarkable and of particular interest for organic thermoelectrics.
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