Question

1. A silicon photoconductive photoconductor maintained at room temperature, has the following dimensions : length=5 mm, width=0.5 mm, and height = 0.5 mm. A voltage of 2V is applied along the length of the photoconductor.

Parameters for Silicon at room temperature  : µn = 1,350 cm2/volt-sec µp = 850 cm2/volt-sec ni = 1 x 1010 /cm3

1. Calculate the dark current.

The photoconductor is next irradiated with a green LED (λ = 500 nm) with 100 mW/cm³ uniform optical power all across the photoconductor.

2. Calculate the total current
3. Calculate photocurrent by subtracting dark current from the total current.
4. What percentage of the dark current is the photocurrent ?

Answer 1

Given S mm OS W: O.Sm.my? 0 OS C70 h :o.5m.m 0.05 cm 2V un = 135o c.me/volt.se up 850 Com? / volt-sec mi ale 10 ani (rint reple 100 (1350 +850) 1-602 x 10 -19 :: 3-52 x 10 n'com' -6 R = l 0.5 3.52*10 (0.05x0.05) R = 56.82x106 r 56.82 M2 Dark current sles R 14 2 56.82M -9 = 35.2 x 10 Amp = 35.2 KAMP