Lecture11-P-N Junction 1 - Electrostatic Potential V...

Info icon This preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
ECE 3040 - Dr. Alan Doolittle Georgia Tech Lecture 11 P-N Junction Diodes: Part 1 How do they work? (postponing the math) Reading: Pierret 5.2
Image of page 1

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

View Full Document Right Arrow Icon
ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode N-type material P-type material N-type material P-type material A p-n junction diode is made by forming a p-type region of material directly next to a n-type region.
Image of page 2
ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode N D -N A x -N A N D E c E i E f E v E c E i E f E v In regions far away from the “junction” the band diagram looks like: Junction
Image of page 3

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

View Full Document Right Arrow Icon
ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode E c E i E f E v E c E i E f E v But when the device has no external applied forces, no current can flow. Thus, the fermi-level must be flat! We can then fill in the junction region of the band diagram as: or…
Image of page 4
ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode E c E i E f E v
Image of page 5

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

View Full Document Right Arrow Icon
ECE 3040 - Dr. Alan Doolittle Georgia Tech E c E i E f E v Our First Device: p-n Junction Diode
Image of page 6
Image of page 7

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

View Full Document Right Arrow Icon
Image of page 8
Image of page 9

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

View Full Document Right Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Electrostatic Potential, V = -(1/q)(E c-E ref ) X V BI or the “built in potential”-qV BI ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode Electrostatic Potential, V=-(1/q)(E c-E ref ) X V BI or the “built in potential” X Electric Field E =-dV/dx ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode Poisson’s Equation: o s o s K dx dE D in or K E ε ρ = = • ∇ , 1 Electric Field Charge Density (NOT resistivity) Permittivity of free space Relative Permittivity of Semiconductor (previously referred to as ε R ) ρ =q( p – n + N D – N A ) ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode X Electric Field, E =-dV/dx X dx dE K o s ε ρ= ECE 3040 - Dr. Alan Doolittle Georgia Tech Energy Potential Electric Field Charge Density-1/q-dV/dx dx dE K o s ε Our First Device: p-n Junction Diode...
View Full 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