Diodes Theory: Operations and Use of Semiconductor Devices, Slides of Advanced Physics

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Operation and Use of Semiconductor Devices

Cleveland Institute of Electronics Diode Theory Lesson Request a Free Catalog

• What is a diode, or semiconductor for that matter?
• If a conductor is suppose to conduct current does that mean a semiconductor partially conducts current?
• A diode is a device that acts like a conductor since it allows current to pass in one direction (known as FORWARD BIASING) and it acts as an insulator since it blocks current passing in the opposite direction (known as REVERSE BIASING).

• When the diode is at rest it will look like:
• The P-type consists of Holes or + charged particles.
• The N-type consists Of Free Electrons or
• Charged particles.

• Diode as a Conductor
• When a voltage is applied current will flow.
• This causes the Holes to move toward the Depletion Region and the Free Electrons to move toward the Depletion Region. The Depletion Region shrinks allowing current to flow. This is Forward Bias.

• The schematic symbol for a diode and how to identify a diode.

• In our discussion, we have indicated that current flows from cathode to anode.
• This is for Electron Current Flow but for those using Conventional Current Flow, it is opposite.

The End