Light-induced current response

Figure 12. Light-induced current response in a thin film reconstituted from purified bacterial reaction centers. (Reproduced with permission from reference...

Taking a typical value of 5 = 5 and considering 10 dynodes. Equation (3.8) gives a gain of G = (which is of the order of 10 ). The particular value of 5 depends, of course, on the dynode material and on the voltage applied between dynodes. Similarly to the case of the photocathode, the responsivity of a photomultiplier, R , is defined as the current induced in the anode divided by the power of the light reaching the photocathode. Thus, it is very simple to show that... 

It is believed that surface localized electron-hole pairs produced under light in SC nanoparticles participate in photo-induced processes of charge transfer between nanoparticles. These processes most probably of quantum tunnel type determine photoconductivity of composite films containing SC nanoparticles in a dielectric matrix. The photocurrent response time in this case should correspond to the lifetime ip of such pairs, which is of the order nanosecond and even more [6]. This rather long ip makes photo-induced tunnel current in composite film possible. 

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