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Animation Demonstration No. 2. Interaction of Light with Semiconductors Normally a semiconductor material has only a few thermally excited free electrons.

Published byAlexandrina Hines Modified over 8 years ago

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Presentation on theme: "Animation Demonstration No. 2. Interaction of Light with Semiconductors Normally a semiconductor material has only a few thermally excited free electrons."— Presentation transcript:

1 Animation Demonstration No. 2

2 Interaction of Light with Semiconductors Normally a semiconductor material has only a few thermally excited free electrons in conduction band at room temperature Conduction Band Valance Band Bandgap

3 Interaction of Light with Semiconductors Absorption of a photon with energy larger than or equal to the Energy Bandgap makes bound electrons jump into conduction band and produce an electron – hole pair. Conduction Band Valance Band electron – hole pair (EHP)

4 Interaction of Light with Semiconductors The number of carriers – electrons in conduction band and holes in valance band thus keep on increasing with larger amounts of incident light flux Conduction Band Valance Band

5 Interaction of Light with Semiconductors The number of carriers – electrons in conduction band and holes in valance band thus keep on increasing with larger amounts of incident light flux Conduction Band Valance Band

6 Interaction of Light with Semiconductors The number of carriers – electrons in conduction band and holes in valance band thus keep on increasing with larger amounts of incident light flux Conduction Band Valance Band

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