A photodiode is exposed to radiation of uniform spectral power density

(covering the range from \(300-500 \mathrm{THz}\). Outside this range there is no radiation. The total power density is \(2000 \mathrm{~W} / \mathrm{m}^{2}\). Assume that the photodiode has \(100 \%\) quantum efficiency.

(a) What is the short-circuit photocurrent of a diode having an active area of \(1 \mathrm{~cm}^{2}(=1 \mathrm{~cm} \times 1 \mathrm{~cm})\) ?

(b) When exposed to the radiation in Part a of this problem, the open-circuit voltage delivered by the diode is \(0.498 \mathrm{~V}\). A \(1.0 \mathrm{~V}\) voltage is applied to the diode (which is now in darkness) in the reverse conduction direction (i.e., in the direction in which it acts almost as an open circuit). What current circulates through the device? The temperature of the diode is \(300 \mathrm{~K}\).

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dP S= dv = constant