Direct comparison of field-effect and electrochemical doping in regioregular poly(3-hexylthiophene)

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We have measured carrier mobility of regioregular poly(3-hexylthiophene) films by both field-effect and electrochemical doping on identical devices, which allowed us a direct comparison between the two doping processes. The carrier mobility of electrochemical doping at low doping levels was lower than that of field-effect doping by two orders of magnitudes, while that of electrochemical doping steeply increased with doping levels, reaching comparable or higher values than that of field-effect doping. These results are attributable to carrier trapping by the Coulomb potentials of dopant anions at low doping levels, demonstrating a significant difference between field-effect and chemical doping.

Original languageEnglish
Article number022104
Pages (from-to)022104-1-022104-3
JournalApplied Physics Letters
Issue number2
Publication statusPublished - 2005 Jan 10


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