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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.89: Poster

Dienstag, 27. März 2007, 18:00–20:00, Poster B

Temperature and Gate-Voltage Dependent Field Effect Mobility of the Conjugated Polymer Poly(3-Hexyl Thiophene) — •Maria Hammer¹, Julia Schafferhans¹, Ingo Riedel², Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians- — ²Div. Functional Materials for Energy Technology, ZAE Bayern e.V., Am Hubland, 97074 Würzburg, Germany

We investigated the field effect mobility of regio-regular poly(3-hexyl thiophene), in dependence of temperature and charge carrier concentration in field effect transistors. The influence of the contact resistance at room temperature is studied: Only for channels above 80 micron length does the contact resistance become negligible, therefore showing the intrinsic field-effect mobility. Consequently, we present temperature dependent measurements for a long channel transistor. The data will be discussed in view of models for charge carrier mobility in disordered organic materials, in particular the parametric description by Pasveer et al [1].

[1] W. F. Pasveer et al., Phys. Rev. Lett. 94 (2005) 206601.