{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ece 3040 Homework3

# ece 3040 Homework3 - ECE 3040 Homework 3 The goal of this...

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

ECE 3040 Homework 3 The goal of this homework is to design a photocell (also known as a photoelectric cell or photoelectric resistor) that will respond to light and change its resistance. This device may be used in a later homework problem. The photocell is basically nothing more than a resistor made out of semiconductor material and is typically arranged in a package as a long skinny slither of very thin semiconductor, most often CdS due to its near optimal bandgap for absorbing the solar spectrum and relative inexpensive material. While a real device has a long serpentine shape (see below) we will simply use a rectangular block as was done in class. The working specifications of your design are for a resistance of 1 Giga-ohm in dark and 3 Mega-ohms in bright light (Intensity, I o =60mW/cm 2 ). Given : The CdS material is p-type with Na=1e14 cm -3 and n i =2e6 cm -3 The mobilities are μ n =100 cm 2 /V-sec and μ p =500cm 2 /V-sec;

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

View Full Document
This is the end of the preview. Sign up to access the rest of the 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