|Apr13-10, 05:49 AM||#1|
Leakage current in diode
My question is related to the leakage current occuring in a diode when connected in reverse bias mode. When the diode is forward biased, the source voltage first neutralizes the barrier potential and then the flow of current occurs. However, I am not able to understand how the current due minority charges flow through a diode when it is reerse bias.
I would be very grateful if there is someone who can help me with this confusion.
|Apr14-10, 10:03 AM||#2|
In reverse, electron-hole pairs are being thermally generated just as in the forward case. For every electron removed from its parent atom, a hole is generated as well. The electrons move when reverse biased, and they encounter holes due to p-type doping. The thermally generated electrons & holes are equal in number, but doping a semiconductor with p-type impurites, i.e. acceptors, results in low electron mobility. The electrons recombine with the abundant holes and few make it to the junction barrier. Likewise, on the n-side, an excess of electrons occur due to doping, and holes have low mobility.
It's all about mobility of e- & h+ which varies with doping level and whether the semiconductor material is n-type, p-type, or intrinsic.
|biasing, circuit analysis, diode, pn junction|
|Similar Threads for: Leakage current in diode|
|Current in Diode.||Electrical Engineering||2|
|capacitor and leakage current||Electrical Engineering||1|
|SPICE simulation of leakage current||Electrical Engineering||2|
|Hi ppl I need some help on leakage current in a dielectric and current-temp relation.||Engineering, Comp Sci, & Technology Homework||0|
|Leakage current or not?||Electrical Engineering||2|