A p-Si photoconductor is to detect optical pulses having the waveform shown belo

Question

A p-Si photoconductor is to detect optical pulses having the waveform shown below. Each pulse generates electron-hole pairs (ehp). When the pulse terminates, the ehp recombine according to the relation delta n_p (t) = delta n_p(0)exp(-t/tau_SRH) where t = 0 refers to the time when the light pulse is turned off. must have decreased to 0.01 delta n_p(0) before the next pulse is applied for proper photoconductor operation. For sigma_n = 10^-16 cm^2 and v_th = 10^7 cm/s, determine N_T for this to happen.

Explanation / Answer

Delta np/np(0) = exp(-t/Tau)

.01 = exp (-t/Tau)

For t=100ns,

Tau = 46ns

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