Sequential Doping of Ladder-Type Conjugated Polymers for Thermally Stable n-Type Organic Conductors
Journal article, 2020

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.

sequential doping

conjugated polymers

organic thermoelectrics

thermal stability


ladder-type polymers


Suhao Wang

Linköping University

Tero Petri Ruoko

Linköping University

Gang Wang

Linköping University

Sergi Riera-Galindo

Linköping University

Sandra Hultmark

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Yuttapoom Puttisong

Linköping University

Fabrizio Moro

Linköping University

Hongping Yan

Stanford Synchrotron Radiation Laboratory

W.M. Chen

Linköping University

M. Berggren

Linköping University

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

S. Fabiano

Linköping University

ACS Applied Materials & Interfaces

1944-8244 (ISSN) 1944-8252 (eISSN)

Vol. 12 47 53003-53011

Subject Categories

Inorganic Chemistry

Materials Chemistry

Condensed Matter Physics





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