Excess carriers reconbinein the image space charge region of a forward-biased pn junction.
And (6.32) more tractable, we need to make some approximations.2.1.2 Wave-Particle Duality We convert have cooler seen in the last section that light waves, in the photoelectric effect, behave as if they are particles.The generation rate is game g' 5 x 10" cm-' s '.4.7 world 1 summarhe concentration of electrons in the conduction band is the integral over the conduction band energy of the product of the density of states function in thc conduction hand and the Frrmi-Dirac probahility function.However, calculations as well as measurements have shown that the ra of the minority carricr hole current to the totel cutrent is extremely low in most case The Schottky harrier diode, then, is a majority carrier cooler device.Section.5 Charge Neutrality.29 world Considcr a gernaniumsemiconductor at T 300.We will assume that the source is at ground potential.(o) What carrier type is the minority carrier?(Use a log scale socket on the horizontal axis.) Neglect bandgap narrowing effects.4.6.2 Variation of EF with Doping Concentration and Temperature We may plot the position of the Fermi energy level as a function of the doping con centration.If we divide both minecraft sides of Equation (6.17) lord by the differential books volume d x d y d z, the net increase in the hole concentration per unit time is Equation (6.18) is known as the continuity equation for holes.The result is nopu N, crack N, exp - - kT "1 - 1 exp (4.41) which may be hunger written as As Equation (4.42) was derived for a general value of Fermi energy, the values of no and po are not necessarily equal.We have Considering the potential harriers, we can write which can a150 be wrltten as VGS - V, VOx 2Jfif, (11.53) bm5 where J, is the metal-semiconductor work function difference, lord and the inversion condition. Acmss-sectional area of lo-' cm2.
We will determine the space charge region width, electric field, and potential semiconductor physics and devices donald neamen pdf through the depletion region.
Narrow space charge width of a zero-biased o r forward-biased B-E junction.