Diode Iv Dark Current — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Diode I-V (Dark Current) Describes the current-voltage relationship of a semiconductor diode when no external light source is applied (dark condition). The current flow in a PN junction is governed by the diffusion of minority carriers. The applied voltage V creates a potential difference across the depletion region. The resulting current is modeled by assuming an exponential dependence on the voltage ratio V/V T. The full Shockley diode equation is used, accounting for saturation current (I S) and the ideality factor (n). V is the applied voltage across the diode junction. The equation is valid for semiconductor junctions operating under steady-state conditions. Confusing the thermal voltage (V T = k B T / q) with the absolute temperature T. Assuming the current is linear (Ohmic) across all voltages, ignoring the exponential dependence. Forgetting that the equation describes the dark current, and external light drastically changes the current.