Conductivity Of Semiconductor — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Conductivity of Semiconductor Applies to both intrinsic and extrinsic semiconductors (n-type and p-type) to calculate total electrical conductivity. Total current density J is sum of electron current density J e and hole current density J h. J = J e + J h = n e e v d,e + n h e v d,h . Substitute drift velocity v d = E. J = e E (n e e + n h h). By Ohm's law J = E. Compare terms: = e(n e e + n h h). Assumes non-degenerate semiconductor statistics. Valid in the Ohmic region (low electric field). Temperature must be constant (as T affects mobility and carrier concentration). Students often forget to convert units from cm -3 to m -3, which is standard in semiconductor data sheets vs SI physics problems. Assuming n e = n h always; this is only true for intrinsic semiconductors. Neglecting the hole contribution in intrinsic semiconductors. Confusing conductivity with resistivity (reciprocal).