How Does a PM Diode Work?
Introduction A PM diode, also photodiode, is a photodetector that converts light into current or voltage. A diode is known for allowing currents to flow in one direction. A PM diode is the same, except that it is more controlled to reach a certain part of a device. The way diodes are situated together determines the direction in which the current will flow. Materials The properties of a PM diode are determined by the materials that are used. Electrons are only excited when the corresponding protons has enough energy to move across the bandgap of the materials. Significant photocurrents are only produced in this instance. Some of the most commonly used materials to produce PM diodes are: • Silicon • Germanium • Indium gallium arsenide • Lead sulfide The greater the bandgap, the less noise is generated during operation. Silicon material has less bandgap range and lead sulfide has the greatest wavelength range. How They Work A PM diode is also known as a PN junction or PIN structure. To u
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