The following specification is for a proposed photodiode for use as part of an image sensor.

Active size: 50 m 50 m

Quantum efficiency, : 0.8

Minimum detectable photocurrent: 1 A

(a) Evaluate the feasibility of using such a device under an illumination of 10Wm-2 at 700nm. Show your work. [ 6 marks ]

(b) State two (2) ways in which the feasibility stated in Part (a) could be improved. [ 4 marks ]