Jump to main content
Jump to site search

Issue 34, 2018
Previous Article Next Article

Influence of dopant size and electron affinity on the electrical conductivity and thermoelectric properties of a series of conjugated polymers

Author affiliations

Abstract

Chemical doping is widely used to manipulate the electrical and thermoelectric properties of organic semiconductors, yet intelligent design of polymer–dopant systems remains elusive. It is challenging to predict the electrical and thermoelectric properties of doped organic semiconductors due to the large number of variables impacting these properties, including film morphology, dopant and polymer energetics, dopant size, and degree of polaron delocalization. Herein, a series of dopants with varying sizes and electron affinities (EAs) are combined with polymers of differing ionization energies (IEs) to investigate how the difference between polymer IE and dopant EA influences the doping efficiency and electrical conductivity, and how the dopant size influences the thermoelectric properties. Our experiments demonstrate that at low doping levels the doping efficiency strongly depends on the difference between the polymer IE and dopant EA; the effectiveness of doping on increasing electrical conductivity drastically decreases at high loadings for the molybdenum dithiolene complexes, while FeCl3 remains effective at high loadings; and the large molybdenum complexes lead to more delocalized polarons as compared to FeCl3. To take advantage of the complementary doping characteristics of the molybdenum complexes and FeCl3, both dopants are employed simultaneously to reach high power factors at relatively low dopant concentrations.

Graphical abstract: Influence of dopant size and electron affinity on the electrical conductivity and thermoelectric properties of a series of conjugated polymers

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Jun 2018, accepted on 03 Aug 2018 and first published on 06 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA05922E
Citation: J. Mater. Chem. A, 2018,6, 16495-16505
  •   Request permissions

    Influence of dopant size and electron affinity on the electrical conductivity and thermoelectric properties of a series of conjugated polymers

    Z. Liang, Y. Zhang, M. Souri, X. Luo, Alex M. Boehm, R. Li, Y. Zhang, T. Wang, D. Kim, J. Mei, S. R. Marder and K. R. Graham, J. Mater. Chem. A, 2018, 6, 16495
    DOI: 10.1039/C8TA05922E

Search articles by author

Spotlight

Advertisements