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Step of 4 3.018P Write the expression for width of depletion layer when the reverse-bias voltage is applied. W = (1) Determine the width of depletion layer for the PN junction with open circuit terminals (at equilibrium). Substitute 0V for in equation (1). W = = Step 2 of 4 Simplify equation (1) is as follows: W = = + ND 1 = Substitute + ND 1 for W = = Therefore, the width of the depletion region W is proved. Step 3 of 4 Write the expression of charge stored on either side of the depletion region. (2) Determine the charge stored on either side of the depletion region for open circuit terminals (at equilibrium). Substitute 0V for in equation (2). Step 4 of 4 Simplify equation (2) is as follows: Substitute for = Hence, the charge stored on the either side of the junction is proved.