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Abstract
Abstract Space charge limits the current under single carrier injection because only approximately CV can be injected. On the other hand, under double injection one requires only that |Q+ - Q−| ≃ CV. In this paper, I discuss the conditions where Q− ≫ CV and the recombination limited current is very large compared with the space charge limited current. It is shown that Q− ≫ CV can be achieved providing that the capture rate constant to neutral recombination centers is very small compared with the capture rate constant to occupied charged centers and the ratio of the extended state mobility μ to the capture rate constant to charged centers is also large.
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