Abstract
Time-dependent carrier concentrations in a pin rectifier operated by a (temporally varying) forward current are investigated. An especially clear limiting case may appear soon after switch-on. It results for the Hall case (i.e. recombination solely in the i region) in a current density rising as an arbitrarily fast exponential function of time, and in a temporarlly constant voltage drop over the i region. Especially this voltage drop has its current-independent stationary value if the current density rises slowly enough. The notion of a “slow process” is generalized for a nonexponential dependence of current density on time, and a criterion for “slowness” is given for any kind of temporal current dependence.
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