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ch16 - Photodiode When a p-n junction is illuminated with...

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    Topic 16 : Application of P-N Junctions                       Fall 2007 ECE 3500 - Semiconductor Materials  and Devices
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    Applications of P-N Junctions The simple p-n junction can be used for many applications including: Rectifier Varactor Diode Tunnel Diode Photodiode Light Emitting Diode Semiconductor Laser Diode Solar Cells
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    Tunnel Diode A tunnel diode is a p + -n +  junction in which the p- and n-regions are doped  so heavily that the Fermi levels lie in the conduction and valence bands (degenerate semiconductors)
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    Tunnel Diode (cont’d)
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    Tunnel Diode (cont’d)
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    Tunnel Diode (cont’d) Note the  negative resistance  regime  in the current-voltage characteristics  of the tunnel diode.
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Unformatted text preview: Photodiode When a p-n junction is illuminated with photons with energy E ph > E g , Photodiode (cont’d) Solar Cells When operating a device in the first or third quadrants, the device absorbs power. In the second and fourth quadrants, the device generates power. i i V V II II I I III III IV IV Solar Cells (cont’d) Thermal Equilibrium Band Diagram Band Diagram under Illumination e e-h h + Solar Cells (cont’d) Light Emitting Diodes and Semiconductor Laser Diodes In both a light emitting diode and a e e-h h + Materials for LEDs and Semiconductor Laser Diodes The bandgap of GaAs 1-x P x covers the spectrum from red to green. λ μ m...
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