ANOMALOUS TEMPERATURE-DEPENDENCE OF DEEP-LEVEL-TRANSIENT-SPECTROSCOPYPEAK AMPLITUDE

The frequently observed variation of the deep-level-transient-spectros copy (DLTS) peak amplitude with emission rate is often attributed to p eculiar characteristics of the investigated traps: (i) broadening of t he trap activation energy resulting in nonexponential capacitance tran sients, (ii) ampheteric behavior of the deep level, and (iii) temperat ure dependence of the capture cross section. Otherwise it could be att ributed to factors related to the technique itself such as contributio n of the lambda volume and effect of the leakage current. In this work we demonstrate that the DLTS peak amplitude variation effect is somet ime due to the presence of a Coulombic repulsive barrier associated wi th the defect investigated.