Transient analysis of a triangular-barrier bulk unipolar diode

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Transient analysis of a triangular-barrier bulk unipolar diode

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The transient analysis of a triangular-barrier bulk unipolar diode (TB) is based on the conduction currents associated with both the majority and minority carriers together with a displacement current associated with the space change regions. During the turn-on and turn-off transients the conduction current, which is determined by thermionic emission-diffusion theory, is shown to have negligible effect compared with the displacement current. The transients and steadystate currents of a typical GaAs TB are compared to those from a device simulator which includes thermionic emission over the barrier, and are shown to be in excellent agreement. 10% time constants are determined by an analytic expression for both turn-on and turn-off and are shown to be equivalent and dependent on the applied DC bias and independent of the position of the p+plane in the undoped region.

Inspec keywords: transient response; semiconductor diodes

Other keywords: triangular-barrier bulk unipolar diode; steady-state currents; DC bias; conduction currents; thermionic emission-diffusion theory; minority carriers; turn-off; semiconductor diodes; GaAs; turn-on; displacement current; space charge regions; transient analysis; device simulator

Subjects: Bulk effect devices

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