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Unformatted text preview: 117 ) ( I e I I op kT qV rs 3 1- & ¡ & ¢ £ & ¤ & ¥ ¦- § § ¨ © ª ª « ¬ = Following eq.(2), when the device is short circuited (V=0), there is a short – circuit current from p to n equal to I op . The usual (i.e., under dark conditions) V-I characteristic for diode is shown in Fig. 4 by the dashed line that passes through the origin (see eq. (1)). Figure 4. V-I characteristic curves of a photo-diode under dark (------) and illuminated ( ___ ) conditions. When the optical generation current, I op is introduced , the nature of the characteristic curve is modified. In the illuminated condition, the curve passes through the fourth quadrant also. When the circuit is open, I=0, using applied reverse bias is also zero, the potential across the junction due to optical generation of electron – hole pairs, become V oc ( as like V) and one can write from eq. (2), ( ) ) ( n L p L g L L ln q kT V p n n n p p op n p oc 4 1 ® ¯ ° ° ° ° ° ° ± ² + & ¡ & ¢...
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.
- Fall '09