- Beyond Ebers-Moll Model:
               - Early Effect (or Base-Width Modulation)
               - Punch Through
               - Base Collector Junction Breakdown
               - Space Charge Recombination
               - Phototransistor

         1. Find the peak value of electric field inside the PN junction
                 in terms of doping concentrations and other parameters. Assume Na>>Nd. 
                 Does Epeak increase or decrease as Nd increases?

              2. In phototransistor, short-circuit emitter and collector currents can be
                 expressed as:
                 iE = AqMf, ic = AqMg. ( See Eq. 8.66 and 8.67 in Fonstad)
                 Determine f and g. (See Eq. 8.68 in Fonstad)

this homepage was constructed in 1997.2
Microelectronics lab figaro@semicon4.yonsei.ac.kr