Time-dependent variation: A new defect-based prediction methodology

For the first time, different impacts of as-grown and generated defects on nm-sized devices are demonstrated. As-grown hole traps are responsible for WDF, which increases with Vg_op and tw. The generated defects are substantial, but do not contribute to WDF and consequently are not detected by RTN. The non-discharging component follows the same model as that for large devices: the ‘AG’ model. Based on this defect framework, a new methodology is proposed for test engineers to predict the long term TDV and yield and its prediction-capability is verified.