Detectivity of Exclusion Photoconductor

The specific detectivity of an exclusion detector is shown in Fig. 3.21. It can bee seen that even the theoretical value of the obtained increase due to exclusion effect is modest (less than 2.5 times). The curve of the specific detectivity versus bias follows a dependence qualitatively very similar to that of current sensitivity. 

3 Charge Carrier Management (Thermal Noise Engineering) 

An interesting detail is that in logarithmic proportions the middle, rising part of the dependence is practically linear, meaning that there is a certain range of bias currents where specific detectivily increases exponentially. In real situations this is significantly impaired by the existence of 1/f noise. 

For the largest values of bias a sharp drop of detectivity is seen, i.e., there is an optimum value for this dependence too. 

A comparison between the calculated values of specific detectivity of an exclusion detector and the BLIP values for a field of view of 180° at the same cutoff wavelength (equal to performance of a photoconductive device at 77 K) shows that all of the calculated values are significandy below the BLIP limit. The detectivity increase in comparison to a photoconductor without nonequilibrium Auger suppression (conventional sub-BLIP photoconductor) is less three times. 

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