When no polarization (in equilibrium): Before exposure, each transistor is in equilibrium: The sum of the positively charged by negative charges in total volume. When exposed to another, due to the concentration difference will occur resulting diffusion of particles majority: empty hole to diffuse from p n, e khuuech also spread in the opposite direction. They create dimensional diffusion line from p to n. On the way diffuser, the other charge would mark a reunion together, making for a narrow region on either side of the boundary surface particle concentrations fell below the guide. In this region, the p-type semiconductor poor areas exist the minority element n-type (negative ions). And the poor areas exist n-minority elements p (hole), that is formed of two layers of space charge sign opposite each other. We were the attraction of opposite ions and the ion thrust of the same sign, they exist in poor areas like 1-6a. Between two layers of this charge will have a potential difference (the more positive side n p), called contact voltage
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