hw03 - ECE 315 Homework 3 Due in the drop box 1(P-N...

Info icon This preview shows pages 1–2. Sign up to view the full content.

ECE 315 Homework 3 Due 2/13/2009 in the drop box 1. (P-N junction, continued from Prob. 7 of HW 2. Please follow the numbers there. ) For a p-n junction well described by the depletion region approximation as shown below, assume the electron mobility μ n =1000cm 2 /Vs, the hole mobility μ p =400cm 2 /Vs, and the minority lifetime τ n = τ p =10 -7 s (a) In equilibrium, which region(s) satisfy the charge neutrality condition? Explain briefly. (4 pts) (b) In equilibrium, which region(s) satisfy the relation of np=n i 2 ? Explain briefly. (4 pts) (c) At V D =0, Calculate the depletion capacitance in F/cm 2 . (4 pts) (d) Estimate the ideal saturation current I S at 300K and 400K. You can use the n i values from Problem 2 of Homework 2. Assume A = 1cm 2 . (4 pts) 2. (Generation and carrier concentrations in the depletion region) For the p-n junction in Prob. 1, the voltage across the diode is V D and the current is I D . (a) At V D = 0.6V forward bias, what is the minority carrier concentrations at –x p and x n ? (4 pts) (b) At V D = 1.0V reverse bias, what is the minority carrier concentrations at –x p and x n ? (4 pts) (c) Plot the log( n ) and log( p ) throughout the entire device under V D =0V, V D =0.6V and V D = 1.0V in the same plot (for better comparison). (4 pts) (d) Plot J n , J p and J n +J p throughout the entire device under V D =0V, V D =0.6V and V D = 1.0V in separate plots. (4 pts) (e) Under the reverse bias, when the electrons n p in region 2 and the holes p n
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern