Semiconductor Current Flow

Ambipolar diffusion = The phenomenon of excess electrons and holes drifting together Internal electric field = The force that attracts electrons and holes back together Ambipolar transport equation = A nonlinear differential equation describing ambipolar diffusion Excess carrier concentration = The number of electrons or holes in excess of equilibrium

Electron mobility = Describes the ease of electron movement Hole mobility = Describes the ease of hole movement Ambipolar mobility = Describes the combined movement of electrons and holes Internal electric field = Causes a force attracting electrons and holes

n = Electron concentration p = Hole concentration Ambipolar diffusion coefficient = Functions of electron and hole concentrations Internal electric field = Depends on the separation of electrons and holes

<p>Excess electrons and holes drift together = Due to the internal electric field The ambipolar transport equation is nonlinear = Due to the dependence on electron and hole concentrations A small internal electric field is sufficient = To keep excess electrons and holes together Electrons and holes have opposite charges = Leading to the creation of an internal electric field</p> Signup and view all the answers

<p>Internal electric field = Attracts electrons and holes back together Ambipolar diffusion coefficient = Describes the combined movement of electrons and holes Excess electron concentration = Affects the ambipolar diffusion coefficient Hole concentration = Affects the ambipolar mobility</p> Signup and view all the answers

<p>Ambipolar diffusion = Involves the combined movement of electrons and holes Electron drift = Occurs in the opposite direction to hole drift Hole diffusion = Occurs in the opposite direction to electron diffusion Internal electric field creation = Occurs due to the separation of electrons and holes</p> Signup and view all the answers