Important announcement

Dear visitor,

Please note that this OpenCourseWare platform will be replaced at the end of 2026 by a new platform (under the same url ocw.tudelft.nl).

Courses and their contents that are currently available the platform will partly be migrated. URL’s for this content will change and content might be unavailable for some time. In addition, some courses will not be available anymore.

If you are linking to specific courses on this platform (for instance for your students), please take timely measures to avoid problems with access. Possible actions are:

Download the materials to your local platform (laptop, server)
For educators only (including TU Delft lecturers): Contact us at ocw@tudelft.nl and inform us what course you are using in what context (institute, program, period of use, number of students). We will research (in collaboration with the authors of the course) and decide if we will migrate the course, and if yes, can supply you with a new url.

Thank you.

Home Courses Solar Energy Course materials Lectures Band Gap

Band Gap

Course subject(s) 2. Working Principle of a Semiconductor Based Solar Cell

In this video Prof Arno Smets talks about the behavior of electrons and the states they can obtain within an atom depending on their energy level. He then explains the way certain atoms contain different state electrons, and how this affects their behavior.

You will find the chapter associated to the lecture below the videos.