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Subnanosecond Avalanche Switching Simulations of n+–n–n+ Silicon Structures

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The simulations of recently discovered effect of subnanosecond avalanche switching of Si n+−n−n+-structures have been performed. The electric field in n+−n−n+-structure is shown to remain quasi-uniform along the current flow… Click to show full abstract

The simulations of recently discovered effect of subnanosecond avalanche switching of Si n+−n−n+-structures have been performed. The electric field in n+−n−n+-structure is shown to remain quasi-uniform along the current flow direction during the voltage rise stage and it reaches the effective threshold of impact ionization of ~200 kV/cm in the whole n-base. Comparing simulation results with experiments we argue that the field distribution is as well uniform in the transverse direction. Hense, the ultrafast avalanche transient develops quasi-uniformly in the whole n-base volume. The switching time is about ~150 ps. We compare numerical results obtained for various impact ionization models and estimate parameters of the initial voltage pulse that are required for ultrafast avalanche switching of n+−n−n+-structures.

Keywords: avalanche switching; avalanche; silicon structures; simulations silicon; subnanosecond avalanche; switching simulations

Journal Title: Semiconductors
Year Published: 2019

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