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Organic semiconductors for thermoelectric applications

: Scholdt, M.; Do, H.; Lang, J.; Gall, A.; Colsmann, A.; Lemmer, U.; Koenig, J.D.; Winkler, M.; Boettner, H.


Journal of Electronic Materials 39 (2010), No.9, pp.1589-1592
ISSN: 0361-5235
ISSN: 1543-186X
International Conference on Thermoelectrics (ICT) <28, 2009, Freiburg>
European Conference on Thermoelectrics (ECT) <7, 2009, Freiburg>
Journal Article, Conference Paper
Fraunhofer IPM ()

The thermoelectric performance of thin films fabricated from two commercially available, highly conductive polymer formulations based on poly (3,4-ethylendioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) was investigated. In order to enhance the electrical conductivity, the high-boiling solvent dimethyl sulfoxide (DMSO) was added. By changing the content of DMSO the electrical conductivity was increased by a factor of two without changing the Seebeck coefficient or the thermal conductivity. We achieved ZT = 9.2 x 10(-3) at room temperature upon the addition of 5 vol.% DMSO to the PEDOT:PSS formulation.