Search results

  1. O

    Effect of doping concentration on the depletion width of p-n junction diodes

    Thank you eq1 for the help and I will surely read the book from the link. But from what you wrote I have some small questions or doubts. When here you say "given electric field" does the word given electric filed means the electric filed requires is fixed for a pn junction of given material...
  2. O

    Effect of doping concentration on the depletion width of p-n junction diodes

    Thank you phyzguy, yes I read wikipedia on this.But I am still not satisfied with the answer (not because answer is wrong but because I must be missing something). I have the following issues with this. (1) It is said to get the same electric field with the increased doping less space...
  3. O

    Effect of doping concentration on the depletion width of p-n junction diodes

    My question for now is as follows: Why does a high doping concentration causes a decrease in the thickness of depletion region. Any help will be highly appreciated! Thanks a bunch Regards!
  4. O

    What is the polarity of a Pn junction diode

    You mean to say the polarity of diode depends on the polarity of sources? Here P side is connected to positive of battery(forward biasing) that is why P of potential barrier is positive? If one apply kirchoffs law in the diagram of diode symbol he/she will find that in this case applied...
  5. O

    What is the polarity of a Pn junction diode

    Images showing contradicting polarity of potential barrier VB.
  6. O

    What is the polarity of a Pn junction diode

    I think I got it. If I am true now, I was missing the fact that unlike outside the circuit, inside the battery positive charge flows from lower potential to higher potential! Or negative charge moves towards lower potential! That is inside the cell the plate towards which the flow of...
  7. O

    What is the polarity of a Pn junction diode

    Note how the picture contradict itself. In big diagram it shows negative terminal(small plate) of VB with P side(right side) but in small diagram adjacent to it showing symbol of diode it shows positive terminal on P side(right side). How does the polarity reverse if one use symbol instead of...
  8. O

    What is the polarity of a Pn junction diode

    I don't know what I should say. Jony130 send the link which contains some theory and diagrams. The figure showing barrier voltage VB with negative polarity(small plate) on P side and positive polarity(large plate) on N side. But just adjacent to it where diode symbol is their in the circuit...
  9. O

    What is the polarity of a Pn junction diode

    Its ovais :-), Hehehe I don't know why you change a well known fact that electric field sucks positive charge(not the negative charge particles like electron) in its direction. It is very well known fact that force on positive charge is in the direction of electric field and that on...
  10. O

    What is the polarity of a Pn junction diode

    My question can be simplified if you see the below picture.
  11. O

    What is the polarity of a Pn junction diode

    The only thing I want to know with reason is why potential decreases as one goes from P to N side of junction diode? I am having hard time going through circuit problems of diode where they apply kirchoffs law. In applying kirchoffs law for diode they take a drop of 0.7V as they move from P to...
  12. O

    What is the polarity of a Pn junction diode

    I fear that it may be taken as arguments or at least considered repeating my own(false) misconceptions but my heart knows it is only due to hunt for the truth. I am not understanding how can potential be more at P than it is at N side when it is clear the field of depletion region is from N to...
  13. O

    What is the polarity of a Pn junction diode

    I would like to know it in the simplest way, linking the issue in hand. When electrons go from N to P, what happens to potential in reality? Will like to keep in mind that the term potential is defined as the work done(by external agent without change in kinetic energy or negative of the...
  14. O

    What is the polarity of a Pn junction diode

    I am also saying that field is from N to P, but the fundamental concept is that potential decreases in the direction of field which clearly means potential decreases from N to P, so P must be lower potential. I don't know what is happening with me that why I can't grasp it or what is the...
  15. O

    What is the polarity of a Pn junction diode

    Yes electrons do need some extra energy to past them but it depends from which side(N to P or P to N) you want electrons to pass. In our circuit we want electrons to move from N side to P side. According to you the polarity of junction is positive at P side and negative at N side. And it is well...
  16. O

    What is the polarity of a Pn junction diode

    My earlier concepts(like [1]positive charge cause positive potential and negative charge cause negative potential [2] potential decreases in the direction of electric field) and the theory of textbook(which is saying [1] their are negative ions near P side and positive ions near N side, [2]...
  17. O

    What is the polarity of a Pn junction diode

    Wait! How can be P side more positive than than N side. When the P side near the junction has negative ions and N side has positive ions.
  18. O

    What is the polarity of a Pn junction diode

    So should I say as one goes from P to N potential decrease? As the examples of the book is assuming.
  19. O

    What is the polarity of a Pn junction diode

    Why they make diode equivalent circuit with P side positive(at higher potential i. e replace it with bigger plate of battery) and N side negative(at lower potential I. e replace it with small plate of battery)
  20. O

    What is the polarity of a Pn junction diode

    Yes this should be but the workout problems(I attached pics in first post) use the reverse assumption( P side Positive and N side negative) in applying kirchoffs laws. Just try to actually apply the law please.
  21. O

    What is the polarity of a Pn junction diode

    My question is that the P side should be negative and N side should be positive that is the potential barrier of diode should be such that P side(being negative) should be at lower potential and N side (being positive) should be at higher potential. In other words potential must increase as one...
  22. O

    What is the polarity of a Pn junction diode

    Do I need to be more clear?
  23. O

    What is the polarity of a Pn junction diode

    Hello all Textbooks teaches us that in the formation of Pn junction in between P and N type semiconductor a region is formed where free electrons of N diffused in P side and exhaust by the holes of P near the junction. Such a region becomes devoit of free charge careers and their are only ions...
Top