This module demonstrates the concepts of semiconductor band gaps and the quantum nature of light using readily available and inexpensive LEDs. It uses a simple fact which surprises many students – LED can detect light (i.e., act as small solar cells) as well as generate light. The lab can be completed in a 1.5 hour period in addition to prior introductory lecture and post lab discussion.
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National Science Foundation
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Dakota County Technical College/ Nano-Link: Center for Nanotechnology Education