Effects of humidity on unencapsulated poly(thiophene) thin-film transistors

Michael L. Chabinyc, Fred Endicott, Bryan D. Vogt, Dean M. DeLongchamp, Eric K. Lin, Yiliang Wu, Ping Liu, Beng S. Ong

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The effects of humidity on unencapsulated polymeric thin-film transistors (TFTs) of poly[5,5'-bis(3-dodecyl-2-thienyl)-2,2'-bithiophene] (PQT-12) were investigated. The field effect mobility of PQT-12 TFTs decreases and the rate of trapping of charge carriers increases under increasing humidity. The amount of water absorbed by the PQT-12 films was measured using a quartz crystal microbalance. Thin films of PQT-12 absorb comparable amounts of water to the carrier concentration in TFTs under routine operating conditions (humidity of 30% relative humidity and gate voltage of -30 V); the changes in electrical characteristics under humid atmospheres are attributed to the interaction of absorbed water with the carriers in the film.

Original languageEnglish (US)
Article number113514
JournalApplied Physics Letters
Issue number11
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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