Accuracy of Derived Analytical Formulas

These same features of the PMC signal can be reproduced by plotting the calculated analytical formula for the depletion region [relation (18)]. This is shown for the positive PMC peak in Fig. 14. By inserting the same parameters into both the numerical and analytical computation procedures, it is found that the analytical solution coincides with the numerical one 

Another interesting test which may give an idea of the use of the simplifications introduced in deriving the analytical formula for photoin-duced microwave conductivity can be obtained from a comparison between the simple Gartner model for the potential-dependent photocurrent18 and the theoretical photocurrent derived from the just-described approach. 

The Gartner model simulates charge collection by a potential-dependent space charge layer and considers diffusion into the space charge layer of charge carriers generated deep inside the semiconductor. The well-known Gartner formula for the photocurrent /ph is 

In our approximation we start with relation (20) for the surface concentration of minority charge carriers and derive /pi, via formula (11). 

It follows that /ph is (only photons /0 leading to minority carrier generation are considered) 

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