Patent ID: 8680883

Claim:
A method of performing a time dependent dielectric breakdown (TDDB) test of a semiconductor device, the method comprising: preparing a TDDB test structure of a semiconductor device including a plurality of test cells having test patterns in which two electrodes are formed having a dielectric layer therebetween; applying a measurement voltage to each of test cells selected from the plurality of test cells and measuring first leakage current values; simultaneously applying a stress voltage to the selected test cells; applying the measurement voltage to each of the test cells to which the stress voltage has been applied and measuring second leakage current values; repeatedly performing the operations of the simultaneously applying of the stress voltage and applying the measurement voltage to measure a plurality of second leakage current values; and determining a TDDB value of a dielectric layer included in each of the selected test cells based on differences between the first and second leakage current values measured in the selected test cells.