Abstract
We report on a strong field-dependent mobility in organic field-effect transistors fabricated by using poly(2,5-bis(3-tetradecylthiophene-2-yl) thieno[3,2-b]thiophene) (pBTTT-C14) as the active polymer layer. Charge transport and mobilities in devices annealed in the mesophase show a more pronounced dependence on channel length as compared with as-cast devices. Analysis reveals that the contact effects in both sets of devices are negligible from room temperature down to ≈100 K. We show that this field dependence is consistent with a Poole-Frenkel model of mobility. Finally, the nonlinear transport data for short channel devices are modeled consistently in the Poole-Frenkel framework over a broad temperature range.
Original language | English (US) |
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Article number | 044503 |
Journal | Journal of Applied Physics |
Volume | 102 |
Issue number | 4 |
DOIs | |
State | Published - 2007 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy