A SIMPLE AND INEXPENSIVE CIRCUIT FOR EMISSION AND CAPTURE DEEP-LEVEL TRANSIENT SPECTROSCOPY

A simple and inexpensive circuit for deep level transient spectroscopy is described, which allows rapid characterization of emission as well as capture activation energies of deep levels. This flexibility of ma king capture activation studies affords more information on defect mor phology than the more standard emission activation studies. This is de monstrated by making a representative capture activation energy measur ement on the EL6 level in undoped n-type GaAs of 0.484+/-0.005 eV. Als o the spectrometer has shown better performance than earlier reported systems by its ability to resolve the side peaks of the EL6 level, for which emission activation energies of 0.29 and 0.4 eV are assigned. C onstructed around a commercially available capacitance meter and pulse generator, the control circuitry is designed and developed using inex pensive and off-the-shelf integrated circuits. (C) 1996 American Insti tute of Physics.