{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

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

View Full Document Right Arrow Icon
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;
Image of page 1

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

View Full Document Right Arrow Icon
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