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Enhancing doping efficiency by improving host-dopant miscibility for fullerene-based n-type thermoelectrics

Qiu, L., Liu, J., Alessandri, R., Qiu, X., Koopmans, M., Havenith, R. W. A., Marrink, S. J., Chiechi, R. C., Koster, L. J. A. & Hummelen, J. C., 28-Oct-2017, In : Journal of Materials Chemistry A. 5, 40, p. 21234-21241 8 p.

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  • Enhancing doping e ffi ciency by improving host- dopant miscibility for fullerene-based n-type thermoelectrics

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DOI

This paper describes a promising n-type doping system with high performance for thermoelectric applications. By introducing the polar triethylene glycol (TEG) side chain onto both fullerene host (PTEG1) and dopant (TEG-DMBI) materials, the TEG-DMBI doped PTEG-1 films obtained through solution processing provide a better miscibility compared with films doped with commercially available N-DMBI (bearing a dimethylamino group instead of TEG), as determined by phase imaging AFM (atomic force microscopy) measurements and coarse-grain molecular dynamics simulations, leading to high doping efficiency up to 18% at 20 mol% doping concentration and thus high carrier density and mobility, which are critical to the electrical conductivity. Therefore a record power factor of 19.1 mu W m(-1) K-2 is obtained with an electrical conductivity of 1.81 S cm(-1), one of the highest values reported for solution processable fullerene derivatives as n-type organic materials for thermoelectric applications to date.

Original languageEnglish
Pages (from-to)21234-21241
Number of pages8
JournalJournal of Materials Chemistry A
Volume5
Issue number40
Publication statusPublished - 28-Oct-2017

    Keywords

  • POWER-FACTOR ENHANCEMENT, ATOMIC-FORCE MICROSCOPY, ORGANIC SEMICONDUCTORS, ELECTRONIC-STRUCTURE, THIN-FILMS, TRANSPORT-PROPERTIES, HIGH-PERFORMANCE, SOLAR-CELLS, DOPED C-60, POLYMER

ID: 49802773