Anomalous behavior of the pulse transfer characteristic of a selectively doped AlxGa1-xAs/GaAs heterostructure containing deep traps

The pulse transfer characteristic of a normal selectively doped AlxGa1-xAs/ GaAs heterostructure containing deep traps in the AlxGa1-xAs layer is consi dered. It is shown that these deep traps are responsible for an undershoot in the drain-source current at the end of a positive voltage pulse applied to the gate (the pulse voltage is measured from the initial gate bias) and the trap depth can be determined from this undershoot. (C) 2000 Elsevier Sc ience B.V. All rights reserved.