Space charge layer definition

Figure 5.2-60 shows the main parameters that characterize the space charge layer. With reference to the figure, the following definitions can be given ... 

The definition of s = R/Sn is useful because s is a quantity which is independent of and consequently of the light intensity. According to Eq. (2.47), s must pass a maximum when the potential is varied across the space charge layer as illustrated qualitatively in Figure 2.14. One branch of the curve is determined by the majority carriers, the other by the minority carriers. The position of the maximum on the (f> scale and the width of the curve depend on the doping of the semiconductor and on the capture cross-sections and Physically speaking, Eq. (2.47) illustrates that for electron-hole recombination at the surface, both holes and electrons must be able to flow into the surface [35]. If cf) is such as to strongly repel either electrons or holes from the surface, s will be low. The validity of Eq. (2.47) has been proved at least qualitatively in many experiments (see, e.g., [5]). 

Since the electro-osinotic flow is induced by the interaction of the externally applied electric field with the space charge of the diffuse electric double layers at the channel walls, we shall concentrate in our further analysis on one of these 0 1 2) thick boundary layers, say, for definiteness, at... 

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