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Modulated Thermoelectric Properties of Organic Semiconductors Using Field‐Effect Transistors
Author(s) -
Zhang Fengjiao,
Zang Yaping,
Huang Dazhen,
Di Chongan,
Gao Xike,
Sirringhaus Henning,
Zhu Daoben
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201404397
Subject(s) - thermoelectric effect , materials science , seebeck coefficient , thermoelectric materials , organic semiconductor , semiconductor , optoelectronics , doping , transistor , field effect transistor , electrical resistivity and conductivity , thermal conductivity , engineering physics , nanotechnology , composite material , electrical engineering , voltage , thermodynamics , physics , engineering
Organic thermoelectric materials, which can transform heat flow into electricity, have great potential for flexible, ultra‐low‐cost and large‐area thermoelectric applications. Despite rapid developments of organic thermoelectric materials, exploration and investigation of promising organic thermoelectric semiconductors still remain as a challenge. Here, the thermoelectric properties of several p‐ and n‐type organic semiconductors are investigated and studied, in particular, how the electric field modulations of the Seebeck coefficient in organic field‐effect transistors (OFETs) compare with the Seebeck coefficient in chemically doped films. The extracted relationship between the Seebeck coefficient ( S ) and electrical conductivity ( σ ) from the field‐effect transistor (FET) geometry is in good agreement with that of chemically doped films, enabling the investigation of the trade‐off relationship among σ , S , carrier concentration, and charging level. The results make OFETs an effective candidate for the thermoelectric studies of organic semiconductors.