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Step 1 of 1 3.009E The hole or minority carrier concentration is, Since, is inversely proportional to It is required to increase the minority carrier concentration in the n region by a factor of 2. Substitute for in the equation. Substitute for in the equation. To increase the minority carrier concentration by 2, lower the doping concentration by a factor of 2. Therefore, the doping concentration to increase the minority carrier concentration by a factor of 2 is,