{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

EE 2 HW 3 09Spring-PS3 - QN

# EE 2 HW 3 09Spring-PS3 - QN - 17 1/cm 3 of Boron How far is...

This preview shows page 1. Sign up to view the full content.

EE2 Problem Set#3 Question 1 (5 points): (a) If I have 5 electrons all at a potential of 1V, what is the total energy of the electrons (in eV)? (b) What is the voltage change for an electron if temperature is increased by 100K? Question 2 (10 points): Suppose the energy of an electron is given by E ( k ) = 2.74 × 10 -37 k 2 Joules where k is given in units of meter -1 . Find the effective mass, and give the ratio of the effective mass to the ordinary mass of the electron. Question 3 (10 points): How far is the Fermi level from the valence band for silicon if the doping is 2x10
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 17 1/cm 3 of Boron? How far is the Fermi level from the conduction band, assuming the bandgap of silicon is 1.1 eV? Question 4 (10 points): A Si sample is doped with 6 X 10 15 cm-3 donors and 2 X 10 15 cm-3 acceptors. Find the position of the Fermi level with respect to E i at 300 K. Question 5 (15 points): Solar cell problem: Fig 1 shows the solar spectral irradiance area (unit: W/m 2 nm) vs different wavelengths (unit: nm). Please calculate the percentage of the sun’s power that will be absorbed into the material with E G = 1.24eV)....
View Full Document

{[ snackBarMessage ]}

### What students are saying

• 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.

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

• 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.

Dana University of Pennsylvania ‘17, Course Hero Intern

• 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.

Jill Tulane University ‘16, Course Hero Intern