The indium acceptor in si et-ev-270mv was used as 4-micron, Ask an Expert

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The indium acceptor in Si, (E_T-E_v)-270mV, was used as 4-micron infrared detector in satellite and space-craft applications since there is a atmospheric absorption window around this wavelength. The absorption cross section is about a Bohr radius of trapped hole. 10^-16cm². The solubility of indium in silicon crystal is about 10¹⁶cm^-3.

The infrared photon flux is 10¹⁴cm^-2s^-1. How long would it take to detect 100 photons using an indium detector of 1 cm²area?

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