| 초록 |
Organic field-effect transistors (OFETs) are evaluated as the most suitable device for flexible electronic devices. However, there is a problem of decreasing electrical characteristics caused by bias-stress instability. Therefore, in this study, bias-stress was applied to various molecular weights of polymethyl methacrylate (PMMA), a polymer insulator. When bias-stress was applied, the low molecular weight of PMMA, the high variation in the drain current. In other words, the high density of the chain-ends of PMMA was the greater bias-stress effect. Through this phenomenon,We extrapolate that charge traps occurred at the chain-ends of the polymer insulator. Additionally, bias-stress was applied in a humid environment and vacuum. In a vacuum, there was no bias-stress effect from molecular weight, However, the bias-stress effect increased as the relative humidity increased. Through this, We extrapolate the charge trapping by PMMA chain-ends adsorbed water vapor. |
