聚合物栅绝缘层厚度对并五苯有机场效应管性能的影响

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3.39×10-3 cm2/Vs、-19V和103。     

Performance of pentacene-based organic field effect transistors using different polymer gate dielectrics

Pentacene-based organic field effect transistors（OFETs） are fabricated using poly（methyl methacrylate）（PMMA） and polyimide（PI） as gate dielectrics,respectively.The fabricated OFETs exhibit reasonable device characteristics.The field-effect mobility,threshold voltage,and on/off current radio are determined to be 3.214 ×10^-2 cm^2 /Vs,-28 V,and 1 ×10^3 respectively for OFETs with PMMA as gate dielectrics,and 7.306×10^-3cm^2 /Vs,-21 V,and 2 ×10^2 for OFETs with PI.Furthermore,the dielectric properties of gate insulator layer are tested and the dipole effect at the semiconductor/dielectrics interface is also analyzed by a model of energy level diagram.