Lec15 Optoelec Diodes - EECS 320 Optoelectronic Diodes...

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EECS 320 Optoelectronic Diodes
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Optoelectronics? Light-emitting Diode Semiconductor Laser Visible Light Sensor
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Optoelectronics Applications Information Technology Displays/Imaging Sensors Waveguide Photodiode M-Z Interferometer Sensor Al x O y cladding GaAs substrate Sensor arm Lighting, solar cells
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Optical Spectrum And Applications We have listed optoelectronic applications. Which wavelengths are of interest? What materials are important? Displays Imaging Sensors/Spectroscopy Information Processing
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Semiconductor Optoelectronic Diodes Detectors convert optical signals into electrical signals Emitters are a source of optical radiation Photodetectors: primary purpose to detect photons Solar Cells: primary purpose is photo- to electrical energy conversion Light-emitting diodes (LEDs) Lasers – may be obtained using optical cavity
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Radiative Recombination, Generation Radiative Recombination (Emitter) Generation (Detector) E=E G E k E C E V E=E G E k E C E V
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Optical Generation The momentum of a photon is small Indirect Bandgap (e.g. Si) Direct Bandgap (e.g. GaAs)
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Optical Recombination The momentum of a photon is small Indirect Bandgap (e.g. Si) Direct Bandgap (e.g. GaAs)
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