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GATE Electronics and Communications (EC) 2022 Solved Paper

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Question : 61

Total: 65

A p-type semiconductor with zero electric field is under illumination (low level injection) in steady state condition. Excess minority carrier density is zero at x = ±,2 l_n where l_n = 10^-4 cm is the diffusion length of electrons. Assume electronic charge, q = −1.6 × 10^-19 C. The profiles of photo-generation rate of carriers and the recombination rate of excess minority carriers (R) are shown. Under these conditions, the magnitude of the current density due to the photo-generated electrons at x = +2 l_n is _________ mA/cm² (rounded off to two decimal places).

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