depletion Definition and 67 Threads

I am studying to become and electrical engineer and am currently taking Electronics I. I am having trouble understanding the change in the depletion region that results from a bias. I understand that at the time of manufacture the free electrons from the n-type semiconductor are attracted to the...

When do you use an internal substrate connection vs an external substrate connection on a depletion mode transistor?

Hello, For simplicity's sake, let's take a np junction. Say we connect the left side (n-pole) to a POSITIVE voltage; this is called a reverse bias, because it will result in a small current from n to p. In other words: electrons will travel from p to n across the junction (and holes will...

Hello all, I am somewhat confused in understanding the depletion region of a p-n junction diode.Everywhere a depletion region is defined as a region near the p-n junction which is devoid of charge carriers.And the formation of this region is said is explain that it is due to the diffusion of...

I am trying to understand some aspects of the depletion layer in a semiconductor diode and I have come across some questions that none of the textbooks I have seem to explain. Perhaps some of you could help? (I must add I am not a physisist but an electronics engineer, although I have been...

Ozone depletion "fake" I'm searching for a site that will give a detailed summary of what the conservatives (I'm sure they existed, they always do) used as their arguments or evidence to show that CFC emissions were not destroying our ozone layer. I want to see some debating back then before...

Background: Math & Physics undergrad Reason for asking: So I was trying to understand semiconductor diodes and realized it all hinged on the PN junction which in turn is worthy of attention because of the effect created by the depletion zone. As I continued on studying up on this I began...

In p-n junction formation, Electron from n-type combine with holes on p-type to form negative ions leaving behind positive ions on n-type. Now, why aren't these negative ions and positive ions attracted by electron on n-type and holes on p-type respectively? They restrict further movement of...

Regarding the formation of depletion region,it forms because free electrons diffuse into p region from n region. after some recombination of holes, a sufficient potential difference is set up to prevent further diffusion. Now, consider the region to the left side of juction(whole P region...

Hi guys, I'm trying to find a reliable formula for calculating the depletion depth in a PIN diode at a given voltage and knowing the doping of the layers. Does anyone have one? Formulae for the PN diode are common, but don't apply to the PIN directly as far as I can see. I found a formula...

Hey there Could anybody answer the following question on dust grains and depletion of Silicon and Carbon on dust: If D(Si)=-3, D(C)=-0.5, and the logarithmic cosmic abundances of Silicon and carbon relative to H as 12 are 7.5 and 8.5 respectively, what is the ratio of the number of atoms of...

Homework Statement question: b,c,d,e Homework Equations possion's equation The Attempt at a Solution I try to solve the problem 1 of Chap.29 on the text: Solid State Physics,Ascroft & Mermin but when I cannot solve after quesion (a). so, anyone, pls help me or give some...

Here is the problem: The PMOS transistor in the figure is conducting current. (a) Is V_TP > 0 or V_TP < 0 for this transistor? (b) Based on the value of V_TP, what type of transistor is in the circuit? (c) Is the proper symbol used in this circuit for this transistor? (d) If the symbol...

What is the difference between burnup calculations and depletion calculations?

fajans rule?? hey can anyone help me with fajans rule? after the emission of alpha rays from a radioactive substance the product remaining has a valency of 2. after the emission of beta rays it has a valency increase of 1. so the ionic depletion changes the valency. thus meaning reducing the...

Hi , i am interested to know physics behind MOS capacitors, on which iam currently working in . i started to fabriacate a MOS capacitor without using oxide (silicon dioxide) layer, i have read in articles that a MOS capacitor can be fabricated by using the native oxide layer ( naturally formed...

Hi, Quick question. In a PN junction, the depletion region will shrink with an increase in temperature. Why is that? Is the Fermi energy of the p and n semiconductors a function of temperature? Thanks! Jax