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Step 1 of 3 3.009P The current density J for a doped silicon is, (1) The electric field E is, V Substitute 1 V for voltage V and 10 µm for length 1 V E = 10 µm = 0.1 V/µm Step 2 of 3 The electron mobility is 1350 cm²/V.s For a doped silicon the electron concentration 'n' approximately equal to donor doping concentration ND. n = The current density value is 2 Charge of an electron 'q' is coulombs. From equation (1) calculate the donor doping ND. = J Substitute C for 2 mA/µm² for J for E and 1350 for 2 = = = Step 3 of 3 Consider the following conversions: 1 cm = 10⁻² m 1 µm = m 1 mA = 10⁻³ A Convert all units into meters to represent doping concentration in per meter³. Therefore, the donor concentration is