ENGRI_1110_hw3_2009

ENGRI_1110_hw3_2009 - ENGRI 1110 Homework#3 Due Wednesday...

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

View Full Document Right Arrow Icon
ENGRI 1110 Homework #3 Due Wednesday, October 7, 2009 1. Solar cell A uses a semiconductor with a band gap of 1 eV. Solar cell B uses a semiconductor with a band gap of 2 eV. Either cell is thick enough to absorb all the light above its band gap. Both cells can work simultaneously with one on the top of the other to operate more efficiently in a small space. a) Which cell has to be on top (first to receive the sunlight) for both to work simultaneously, and why? b) It is more realistic to assume that a solar cell made of a particular semiconductor operates efficiently over some range of photon energies (see Slide 21 of Lecture 13). So assume that Solar cell A absorbs all the light above 1 eV but only converts 15% of the sun’s power in the range from 1 eV and 2.5 eV to electrical power (there is no power conversion outside this range). Assume that cell B absorbs all the light above 2 eV but only converts 5% of the sun’s power in the range from 2 eV to 3.5 eV to electrical power (there is no power conversion outside this range).
Image of page 1

Info iconThis 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