TY - JOUR
T1 - Sequential Doping of Ladder-Type Conjugated Polymers for Thermally Stable n-Type Organic Conductors
AU - Wang, Suhao
AU - Ruoko, Tero Petri
AU - Wang, Gang
AU - Riera-Galindo, Sergi
AU - Hultmark, Sandra
AU - Puttisong, Yuttapoom
AU - Moro, Fabrizio
AU - Yan, Hongping
AU - Chen, Weimin M.
AU - Berggren, Magnus
AU - Müller, Christian
AU - Fabiano, Simone
N1 - Funding Information:
The authors thank Sepideh Zokaei (Chalmers) for help with TGA measurements. S.F. acknowledges the support from the Swedish Research Council (2016-03979), ÅForsk (18-313, 19-310), and Olle Engkvists Stiftelse (204-0256). S.F. and W.M.C. acknowledge financial support from the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No 2009 00971). T.-P.R. acknowledges financial support from the Finnish Cultural Foundation and the Finnish Foundation for Technology Promotion. S.H. and C.M. acknowledge financial support from the Knut and Alice Wallenberg Foundation through the project “Mastering Morphology for Solution-borne Electronics”. W.M.C. acknowledges financial support from the Knut and Alice Wallenberg Foundation (Dnr KAW 2014.0041).
Publisher Copyright:
©
PY - 2020/11/25
Y1 - 2020/11/25
N2 - 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.
AB - 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.
KW - conjugated polymers
KW - ladder-type polymers
KW - n-doping
KW - organic thermoelectrics
KW - sequential doping
KW - thermal stability
U2 - 10.1021/acsami.0c16254
DO - 10.1021/acsami.0c16254
M3 - Article
C2 - 33179508
AN - SCOPUS:85096645506
SN - 1944-8244
VL - 12
SP - 53003
EP - 53011
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 47
ER -