Sequential Doping of Ladder-Type Conjugated Polymers for Thermally Stable n-Type Organic Conductors


                       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 °C. This finding is remarkable and of particular interest for organic thermoelectrics. 


ACS Applied Materials & Interfaces

  1944-8244 (ISSN)  1944-8252 (eISSN)                                                            Vol. 12, Issue 47, p. 53003-53011                                                                                                                                    

DOI

10.1021/acsami.0c16254


 https://research.chalmers.se/publication/521330/file/521330_Fulltext.pdf                    

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