Low-Voltage Organic Field-Effect Transistor With PMMA/[Formula Omitted] Bilayer Dielectric

• Published in: IEEE transactions on electron devices 2009-03, Vol.56 (3), p.370-376
• Main Authors: Liwei Shang, Liwei Shang, Ming Liu, Ming Liu, Deyu Tu, Deyu Tu, Ge Liu, Ge Liu, Xinghua Liu, Xinghua Liu, Zhuoyu Ji, Zhuoyu Ji
• Format: Article
• Language: English
• ISSN: 0018-9383; 1557-9646
• DOI: 10.1109/TED.2008.2011576

This paper reports on the application of a bilayer polymethylmethacrylate (PMMA)/ZrO@@d2@ dielectric in copper ph-thalocyanine (CuPc) organic field- effect transistors (OFETs). By depositing a PMMA layer on ZrO@@d2@, the leakage of the dielectric is reduced by one order of magnitude compared to single- layer ZrO@@d2@. A high-quality interface is obtained between the organic semiconductor and the combined insulators. By integrating the advantages of polymer and high-fe dielectrics, the device achieves both high mobility and low threshold voltage. The typical field-effect mobility, threshold voltage, on/off current ratio, and subthreshold slope of OFETs with bilayer dielectric are 5.6 times 10@@u-2@ cm@@u2@/V ldr s, 0.8 V, 1.2 times 10@@u3@, and 2.1 V/dec, respectively. By using the bilayer dielectrics, the hysteresis observed in the devices with single-layer ZrO@@d2@ is no longer present.