(1) Solution The responsivity at M=1 in terms of the quantum efficiency is
Q(?)?Ne(?)I(?)/eS(?)hc??Np(?)?e(?)/h??ee?1.6?10?19?1.55?10?6S(?)?Q(?)?0.6?hc6.626?10?34?3?108?0.75AW?1IphoS(?)??(?)Ipho?S(?)?(?)?(0.75AW?1)?(20?10?9W)?1.5?10?8AIph?MIpho?1.80?10?7A
S'(?)?Iph?(?)?MIpho?(?)?MS(?)?12?0.75?9.0AW?1(2) If Iis the primary photocurrent and ?0 is the incident optical power then by definition Spho ?Ipho?0
so that