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

Liang, Zhiming; Zhang, Yadong; Souri, Maryam; Luo, Xuyi; Boehm, Alex M.; Li, Ruipeng; Zhang, Yan; Wang, Tairan; Kim, Doo -Young; Mei, Jianguo; Marder, Seth R.; Graham, Kenneth R.

doi:10.1039/C8TA05922E

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

Journal Article · Mon Aug 06 00:00:00 EDT 2018 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/C8TA05922E· OSTI ID:1482091

Liang, Zhiming ^[1]; Zhang, Yadong ^[2]; Souri, Maryam ^[1]; Luo, Xuyi ^[3]; Boehm, Alex M. ^[1]; Li, Ruipeng ^[4]; Zhang, Yan ^[1]; Wang, Tairan ^[5];

^[1];

^[3]; Marder, Seth R. ^[2];

^[1]

Univ. of Kentucky, Lexington, KY (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)
Purdue Univ., West Lafayette, IN (United States)
Brookhaven National Lab. (BNL), Shirley, NY (United States)
South China Normal Univ. (People's Republic of China)

Here, 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1482091

Alternate ID(s):: OSTI ID: 1464569

Report Number(s):: BNL-209436-2018-JAAM; JMCAET

Journal Information:: Journal of Materials Chemistry. A, Vol. 6, Issue 34; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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