Response of a Simple Photoconductor to a Square Light Pulse

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Abstract
The time dependent signal produced by a finite light pulse of constant intensity is calculated for a photo‐conductor for which trapping effects are neglected. It is found that the signal is given by a sum of terms varying exponentially with time and involving an infinite set of time constants whose values are determined by the geometry and the rates of bulk and surface recombination. It is shown that the maximum signal occurs at the end of the pulse and that in order to maximize the ratio of the maximum signal to the noise it is desirable to have equal recombination rates on the two surfaces and to make the ratio of the thickness to the diffusion length as small as is possible without adversely affecting the steady‐state detectivity.

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