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Top-contact organic field effect transistors(OFETs) based on poly(3-hexylthiophene)(P3HT) with different concentrations in chloroform(CHCl3) are fabricated.The output characteristics indicate that the P3HT concentration has significant influence on the OFET devices.The performance of the devices firstly is enhanced with increasing the P3HT concentration,and then decreases.The optimized devices with the P3HT concentration of 2 mg/mL show the best performance.The fieldeffect mobility is up to 1.4×10-2 cm2/Vs,the threshold voltage(Vt) is as low as-20 V,and the current on/off ratio(Ion/off) is close to the order of 104.The results suggest that the P3HT aggregation patterns induced by different concentrations can improve the performance of the OFETs.
Top-contact organic field effect transistors (OFETs) based on poly (3-hexylthiophene) (P3HT) with different concentrations in chloroform (CHCl3) are fabricated. Output characteristics indicates that the P3HT concentration has significant influence on the OFET devices.The performance of the devices is enhanced with increasing the P3HT concentration, and then decreasing. The optimized devices with the P3HT concentration of 2 mg / mL show the best performance. The fieldeffect mobility is up to 1.4 × 10-2 cm2 / Vs, the threshold voltage (Vt) is as low as-20 V, and the current on / off ratio (Ion / off) is close to the order of 104. The results suggest that the P3HT aggregation patterns induced by different concentrations can improve the performance of the OFETs.