采用不同厚度的聚甲基丙烯酸甲酯(PMMA)作为栅绝缘层,制备了并五苯有机场效应晶体管(OFET)。测量了不同厚度的PMMA的介电特性,并详细分析了栅绝缘层厚度对器件性能的影响。其中,采用260nm厚的PMMA栅绝缘层的OFET具有比采用其它厚度的器件更优越的性能,其场效应迁移率、阈值电压与开关电流比分别达到3.39×10^-3cm2/Vs、-19V和10^3。
Pentacene-based organic field effect transistors (OFETs) using various thicknesses of poly (methyl methacrylate) (PMMA) as gate dielectric have been fabricated. The dielectric properties of PM- MA layer are investigated and the effects of the insulator thickness on the performance of the devices are analyzed in detail. The OFET devices based on 260 nm-thick PMMA gate dielectric exhibit preferable performance and possess a field-effect mobility of 3.39 × 10^-3 cm^2 /Vs, a threshold voltage of -19 V, and an on/off current ratio of 103.