Abstract
The current response to pulsed and constant external bias is studied on wafers of semi-insulating CdTe crystals which are provided with contacts of aquadag. Space-charge-limited current (sclc) is observed. The magnitude of the large-signal turn-on transient current suggests that electrons are the injected carriers. The time constant of the current decay yields a value of the electron trapping time τ + of ∼ 10 −7 sec. Double pulse experiments provide the value of the detrapping time τ D and its activation energy E t = 0.65 eV. From these quantities, a trap concentration N t = 0.85 × 10 12 cm −3 and a trapping cross-section σ = 3.8 × 10 −13 are deduced. The results are compared with the d.c. characteristic of the devices and with data reported in the literature. Good agreement is obtained, indicating the usefulness of transient and d.c. sclc for characterizing semi-insulating materials and the injecting nature of the contacts.
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